Consulta: subjectFacets:"Spermatogenesis"
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Data/hora: 05/06/2024 14:09:01

Analysis of topological organization of chromatin during spermatogenesis in mouse testis
Provedor de dados: 74
Autores: Narayan,Gopeshwar; Raman,Rajiva.
Eukaryotic chromatin is organized as radial DNA loops with periodical attachments to an underlying nucleoskeleton known as nuclear matrix. This higher order chromatin organization is revealed upon high salt extraction of cells. To understand the sequential change in the functional organization of chromatin during spermatogenesis, we have analysed the higher order organization of chromatin in different testicular cell types and the epididymal sperm of laboratory mouse. The expansion and contraction of the nucleoid DNA following 2 M NaCl extraction was measured in a fluorescence microscope using ethidium bromide (2.5-200 mg/mL) as an intercalating dye to induce DNA positive supercoils. While the halo size varied among cell types (pachytene DNA most extended,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromatin; DNase I; Nucleoid; Spermatogenesis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100006

Meiotic chromosomes and nucleolar behavior in testicular cells of the grassland spittlebugs Deois flavopicta, Mahanarva fimbriolata and Notozulia entreriana (Hemiptera, Auchenorrhyncha)
Provedor de dados: 74
Autores: Castanhole,Márcia Maria Urbanin; Pereira,Luis Lênin Vicente; Souza,Hederson Vinicius de; Valério,José Raul; Barbosa,Leonardo Rodrigues; Itoyama,Mary Massumi.
Spittlebugs annually infest pastures and cause severe damage, representing a serious problem for the tropical American beef cattle industry. Spittlebugs are an important biotic constraint to forage production and there is a lack of cytogenetic data for this group of insects. For these reasons, we conducted this work, in which the spermatogenesis and nucleolar behavior of Deois flavopicta, Mahanarva fimbriolata and Notozulia entreriana were studied. The males possessed testes in the shape of a "bunch of grapes"; a variable number of testicular lobes per individual and polyploid nuclei composed of several heteropycnotic bodies. A heteropycnotic area was located in the periphery of the nucleus (prophase I); the chiasmata were terminal or interstitial;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomal characterization; Karyotype; Cytogenetics; Spermatogenesis; Holocentric chromosomes.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200008

Chromosome complement and meiosis in three species of the Neotropical bug genus Antiteuchus (Heteroptera, Pentatomidae, Discocephalinae)
Provedor de dados: 74
Autores: Lanzone,Cecilia; Souza,Maria José de.
Orcein staining of spermatocytes was used to study the meiotic behavior of holocentric chromosomes in three member of the genus Antiteuchus (commonly known as stink bugs). We describe and illustrate the karyotype of Antiteuchus mixtus, A. sepulcralis and A. macraspis which were cytogenetically characterized as having a diploid number of 2n = 14 and an XY sex chromosome system showing pre-reductional meiosis for autosomes and post-reductional meiosis for sex chromosomes. These species were also shown to have a long diffuse stage during meiotic prophase I and aberrant harlequin-type meiocytes. The chiasma frequency was also analyzed for two of the three species studied.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Holokinetic chromosomes; Sex chromosomes; Meiosis; Diffuse stage.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100011

Spermatogenesis of Zaprionus indianus and Zaprionus sepsoides (Diptera, Drosophilidae): cytochemical, structural and ultrastructural characterization
Provedor de dados: 74
Autores: Rego,Letícia do Nascimento Andrade de Almeida; Silistino-Souza,Rosana; Azeredo-Oliveira,Maria Tercília Vilela de; Madi-Ravazzi,Lilian.
Zaprionus indianus is a drosophilid native to the Afrotropical region that has colonized South America and exhibits a wide geographical distribution. In contrast, Z. sepsoides is restricted to certain African regions. The two species differ in the size of their testes, which are larger in Z. indianus than in Z. sepsoides. To better understand the biology and the degree of differentiation of these species, the current study evaluated spermatogenesis in males of different ages by conventional staining techniques and ultrastructural analysis. Spermatogenesis and the ultrastructure of spermatozoa were similar in the two species, and the diploid number was confirmed to be 2n = 12. A greater number of spermatozoa were observed in young Z. indianus (1-3 days old)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zaprionus indianus; Zaprionus sepsoides; Spermatogenesis; Cytochemistry; Ultrastructure; Meiosis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100008

Targeted disruption of the mouse testis-enriched gene Znf230 does not affect spermatogenesis or fertility
Provedor de dados: 74
Autores: Liu,Yunqiang; Tao,Dachang; Lu,Yongjie; Yang,Yuan; Ma,Yongxin; Zhang,Sizhong.
The mouse testis-enriched Znf230 gene, which encodes a type of RING finger protein, is present primarily in the nuclei of spermatogonia, the acrosome and the tail of spermatozoa. To investigate the role of Znf230 in spermatogenesis, we generated Znf230-deficient mice by disrupting Znf230 exon-5 and exon-6 using homologous recombination. The homozygous Znf230-knockout (KO) mice did not exhibit Znf230 mRNA expression and Znf230 protein production. Znf230 KO mice exhibited no obvious impairment in body growth or fertility. Male Znf230 KO mice had integral reproductive systems and mature sperm that were regular in number and shape. The developmental stages of male germ cells of Znf230 KO mice were also normal. We further examined variations in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Znf230; Knockout mice; Spermatogenesis; Kctd14.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000500014

Morphology and dynamics of male gametogenesis in Sympterygia bonapartii (Chondrichthyes, Rajidae) from Northern Patagonia
Provedor de dados: 76
Autores: Moya,Ana C.; Andrade,María C. Díaz; Galíndez,Elena J.
ABSTRACT The smallnose fanskate, Sympterygia bonapartii Müller &amp; Henle, 1841 is one of the most disembarked items in commercial harbors in Argentina. In this work, the microscopic architecture of mature male gonads and the dynamics of cysts development are analyzed as a contribution to awareness of the reproductive biology of the species. Some biological data related to reproduction are given as well. Two seasons were sampled (fall and spring) and length classes's frequency distribution and maturity stages frequency distribution are given. Size at first sexual maturation for males was estimated at 57 cm of total length. Testes are symmetric, peer, lobed, with several germinal zones. Inside the gonads, there are many spermatocysts, containing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Histology; Testis; Smallnose fanskate; Spermatogenesis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000300316

Fisiologia sexual do macho caprino.
Provedor de dados: 14
Autores: NUNES, J. F.
Producao dos espermatozoides e puberdade; Caracteristicas do esperma caprino; Fatores de variacao da producao espermatica; Fatores climaticos; Fatores alimentares; Fatores estacionais; Funcao fisiologica do plasma seminal e interacao com os espermatozoides incubados in vitro.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Puberdade; Fertility; Sexual behaviour.; Caprino; Comportamento sexual; Fertilidade; Espermatogênese; Maturidade sexual; Goats; Spermatogenesis; Sexual maturity.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/514767

Human chorionic gonadotropin induces spermatogenesis and spermiation in 1-year-old European sea bass (Dicentrarchus labrax): Assessment of sperm quality
Provedor de dados: 5
Autores: Schiavone, R; Zilli, L; Vilella, S; Fauvel, Christian.
The aims of the present study were (a) to compare sperm quality (percentage of motile spermatozoa, motility duration, density and fertility after cryopreservation) between precocious and normally maturing male European sea bass Dicentrarchus labrax, (b) to examine the potential of human chorionic gonadotropin (hCG) to increase spermiation in precocious males and (c) to examine the potential of hCG to induce spermatogenesis and spermiation in non-precocious 1-year-old males. One hundred precocious and 100 non-precocious fish were each randomly divided in two groups each: control (precocious saline-treated and non precocious saline-treated) and treated (precocious hCG-treated and non precocious hCG-treated). Treated groups were administered weekly with 1000...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; HCG; European sea bass; Spermiation; Spermatogenesis.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1815.pdf

Morphological and cytological aspects of sex inversion in a protogynous hermaphrodite, Epinephelus microdon (Teleostei, Serranidae).
Provedor de dados: 5
Autores: Brusle, S; Debas, L; Cauty, C.
The sexuality of the grouper Epinephelus microdon , caught by diving in the area of Tahiti Island, from January 1986 to March 1987, is investigated. Small specimens are females, males occur among the largest fishes, revealing the protogyny of Epinephelus microdon as in other Epinephelinae. Nineteen fishes among 233 samples studied are in sex inversion.
Tipo: Text
Palavras-chave: Epinephelus microdon; Ovaries; Sperm; Spermatogenesis; Females; Males; Sexual cells; Spawning; Cytology; Animal morphology; Sex reversal; Sex determination.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1440.pdf

Induction of ovulation and stimulation of spermation by LHRH or an LHRH analog associated or not with pimozide. Effects on some teleost fish.
Provedor de dados: 5
Autores: Billard, R; Weil, C; Barnabe, G.
Effectiveness of LHRH and one of its analogs (LHRH-A = D-Ala super(6) ethylamide) on induction of ovulation and stimulation of spermiation is reviewed here. LHRH was also combined with pimozide, an anti-dopaminergic agent, to try to cancel dopamine inhibition of gonatotropin (GtH) release. LHRH-A alone (50 mu g/kg) did not initiate ovulation but only oocyte maturation. When pimozide (10 mg/kg) and LHRH-A (50 mu g/kg) were combined, gonadotropic hormone secretion was significantly increased, causing ovulation and stimulating spermiation. This combination advanced ovulation in trout. Trout egg quality was markedly altered by the pimozide treatment; it remains to be tested in carp. In sea bass, LHRH-A was much more effective than LHRH, and ovulation was...
Tipo: Text
Palavras-chave: Salmonidae; Dicentrarchus labrax; Sparidae; Cyprinidae; Teleostei; Pisces; Inhibitors; Sex hormones; Sexual maturity; Spermatogenesis; Ovulation; Induced breeding; Sexual reproduction.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1218.pdf

Analysis of the black-chinned tilapia Sarotherodon melanotheron heudelotii reproducing under a wide range of salinities: from RNA-seq to candidate genes
Provedor de dados: 5
Autores: Avarre, Jean-christophe; Dugue, R.; Alonso, Pascal; Diombokho, A.; Joffrois, C.; Faivre, N.; Cochet, C.; Durand, Jean Dominique.
The black-chinned tilapia Sarotherodon melanotheron heudelotii is an ecologically appealing model as it shows exceptional adaptive capacities, especially with regard to salinity. In spite of this, this species is devoid of genomic resources, which impedes the understanding of such remarkable features. De novo assembly of transcript sequences produced by next-generation sequencing technologies offers a rapid approach to obtain expressed gene sequences for non-model organisms. It also facilitates the development of quantitative real-time PCR (qPCR) assays for analysing gene expression under different environmental conditions. Nevertheless, obtaining accurate and reliable qPCR results from such data requires a number of validations prior to interpretation....
Tipo: Text
Palavras-chave: Gene expression; Non-model organism; Reference gene; Salinity; Spermatogenesis; Tilapia.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28255/26625.pdf

Morphological Aspects of Spermatogenic Cells at Different Stages of Sexual Maturation in Black Isogenic C57BL/6/Uni Mice
Provedor de dados: 77
Autores: Martins,M. R. F. B; Silva,P. J. R; Martins,B. B; Zoca,S. M; Freitas,M. A; Batista,T. C.
In order to study the morphological changes that occur in cells of the testes of isogenic black mouse C57BL/6/Uni into three periods during spermatogenetic used 15 mice divided into 3 groups of 5 animals with 40, 50 and 60 days of age. The mice were sacrificed and weighed. Then weighed and measured the testicles, to be processed finalmete histologically and stained with HE, PAS and Masson Massom-H and evaluated under light microscopy. Was observed in group I with 40 days of age in the seminiferous tubules had a lumen with sparse small amount of interstitial tubular cells. In the seminiferous epithelium were identified type A spermatogonia, intermediate and B, which occupied the compartment adbasal and intermingled with these cells was observed in...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Mouse; Testes.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100052

Effects of Nandrolone Decanoate on Spermatogenesis in Wistar Rats With and Without Physical Training
Provedor de dados: 77
Autores: Maia,Bernardo Porto; Silveira,Jéssica de Oliveira; Borges,Mariana Garcia Lisboa; Pereira,Danilo Ales Ponzi; Pinheiro,Julyara Lima; Freitas,Jofre Jacob da Silva; Kietzer,Katia Simone.
Androgenic anabolic steroids (AAS) are artificial testosterone analogues, used as medicine in chronic diseases, because they increase protein synthesis generating muscle hypertrophy. Its effect has caught the attention of athletes and gym users, thus their consumption has become epidemic, due to easy marketing, the immediate results and the false impression that it doesn't carry health risks. Such risks may globally harm the body. This study aims to investigate the influence on spermatogenesis of using nandrolone decanoate with or without physical training. Twenty-four rats, divided into four groups were used: sedentary group (SG), sedentary on steroids group (SSG), trained group (TG) and trained on steroids group (TSG). The animals were trained on...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Anabolic agents; Nandrolone; Exercise; Fertility.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300046

MICE TESTICULAR DAMAGE ELICITED BY MALATHION
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; González-Hormazábal,Patricio.
Organophosphorous pesticides are a healh problem worldwide, mostly for agroworkers, which are around 2600 millions of person in the year 2001. Little is known about male reproductive damage elicited by these chemicals. The acute effects of malathion (single intraperitoneal injection), 1/12 the LD50 to mice were analyzed at 1, 8, 16, 35 and 40 days after injection, in terms of spermatogenic cell proliferation and apoptosis and of Sertoli cell compromise as revealed by immunocytochemical detection of CK-18 (cytokeratin). The micronuclei test was done to assess for genotoxic activity of the agropesticide. The results showed decreased germ cell number followed by compensatory spermatogonial proliferation by 16 days (as shown by thymidine-H3 testicular uptake),...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Organophosphorous agropesticides; Proliferation; Apoptosis.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000200010

Histological Study on the Male Reproductive Organs of Mouse CF1 Treated With Boron
Provedor de dados: 77
Autores: Espinoza-Navarro,O; Vilaxa,A; Granifo,L; Rojas,S; Rodríguez,H.
Boric acid and borate are abundant in the nature and widely used in industrial, agricultural and cosmetology applications. However it is informed as toxic in a high dose. Residents of Arica-Chile with boron-rich geology deposits are regularly exposed to higher levels in drinking water in concentrations of 6. 0 and 12.0 mg/L. The objective of this study was to analyze the damage in the masculine reproductive apparatus of mouse CF1, exposed to boric acid in concentrations of 0.54; 2.0-6.0 and 12.0 mg/L, after 60 days of treatment. Male gonad segments were fixed in Bouin's solution for 6 hours and embedded in paraffin, longitudinal sections (5 mm) were processed for histology using the hematoxyline/eosin method. The results observed in treated animals...
Tipo: Journal article
Palavras-chave: Boric acid; Spermatogenesis; Testicular atrophy; Mouse.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200017

Ultrastructural Study of Spermatogenesis in Eisenia foetida (Annelida, Oligochaeta)
Provedor de dados: 77
Autores: Rolando,A.; Romanini,M. C.; Mugnaini,M. T.; Bozzo,A.; Pastorino,I.; Soñez,C. A.
Spermatogenesis and the spermatozoon ultrastructure follow a common pattern in terrestrial oligochaetes. However, many of their characteristics are distinctive of each species and they are of great importance for phylogenetic and taxonomic studies. Germinal cells were studied through conventional electronic microscope techniques in order to go deep on spermatogenesis, especially on the mature spermatozoon ultrastructure of Eisenia foetida. Spermatogenesis occurs in seminal vesicles and follows a pattern comparable to that of some other oligachaetes species. Spermatozoon ultrastructural details revealed that it is a filiform cell, with the acrosome placed in anterior position, followed by the nucleus, the midpiece and the tail which flagellum has a 9+2...
Tipo: Journal article
Palavras-chave: Oligochaeta; Spermatogenesis; Ultrastructure; Spermatozoa; Eisenia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200005

Morphological Aspects of Spermatogenic Cells at Different Stagesof Sexual Maturation in Black Isogenic C57BL/6/Uni Mice
Provedor de dados: 77
Autores: Martins,M. R. F. B; Silva,P. J. R; Martins,B. B; Zoca,S. M; Freitas,M. A; Batista,T. C.
In order to study the morphological changes that occur in cells of the testes of isogenic black mouse C57BL/6/Uni into three periods during spermatogenetic used 15 mice divided into 3 groups of 5 animals with 40, 50 and 60 days of age. The mice were sacrificed and weighed. Testicles were weighed and measured, and histologically processed and stained with HE, PAS and Masson Massom-H and evaluated under light microscopy. It was observed that group I with 40 days of age in the seminiferous tubules had a lumen with sparse small amount of interstitial tubular cells. In the seminiferous epithelium type A spermatogonia, intermediate and B were identified, which occupied the compartment adbasal and intermingled with these cells in spermatocytes I in Pachytene and...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Mouse; Testes.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200022

Rat Spermatogenesis Damage in Intermittent Hypobaric Hypoxia and the Protective Role of Melatonin. II: Testicular Parameters
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Castro-Sánchez,Rodrigo; Ramos-González,Benito; Torres-Díaz,Leandro.
At present it is not clear if male fertility is affected by intermittent hypobaric hypoxia (IHH). This is an important issue since a large human population works over 3000 masl. This study analyzes testicular changes in adult Sprague Dawley rats after five cycles of IHH (7 day exposure to 4200 masl in a hypobaric chamber / 7 day at 500 masl). The animals were separated into groups of 8, one group was exposed to hypoxia (7 days), and the others to IHH for one to five cycles. Controls (500 masl) were examined at the beginning and at the end of the 70 experimental days. A duplicate set of rats treated with melatonin (supposedly protecting from hypoxia) was also examined, as were their controls, injected with 0,03% ethanol (melatonin...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Intermittent hypobaric hypoxia; Melatonin protection.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200034

The Reproductive Biology of the Caspian Green Lizard, Lacerta strigata (Sauria: Lacertidae) in Iran
Provedor de dados: 77
Autores: Hojati,Vida; Keshavarz,Seyed Mohammad; Behniafar,Reza; Shiravi,Abdolhossein.
The Caspian Green Lizard, Lacerta strigata Eichwald, 1831, is a member of the Lacertidae family distributed in the Caspian coast of northern Iran. The specimens were found in coastal dunes, hilly areas and pastureland containing some shrubby cover. In this research, the reproductive biology of this species was studied from April 20 to September 5, 2013. Forty eight adult specimens including 24 females and 24 males were collected by hand at midday from three sampling stations (Goharbaran, Ab-Bandansar and Ab-Bandankesh) of Sari County, located in Mazandaran Province of Iran. Ovaries and testes were removed and processed for histological and morphometric studies. In females, there were 6­17 follicles in each ovary. Totally, 6­10 oviductal eggs were observed...
Tipo: Journal article
Palavras-chave: Lacertidae; Caspian green lizard; Oogenesis; Spermatogenesis; Caspian coast.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200005

Potential Radioprotective Effect of AT1 Receptor Antagonists Against Morphological and Ultrastructural Changes in the Testes Induced by Ionizing Radiation
Provedor de dados: 77
Autores: Schwarz,Franciele Cristina; Mansano,Naira da Silva; Chies,Agnaldo Bruno; Viani,Gustavo Arruda; Spadella,Maria Angélica.
Radiotherapy is a source of human exposure to ionizing radiation. This pure energy causes deleterious effects on tissues, which result from oxidative stress, a phenomenon in which there is the participation of the Renin-Angiotensin System (RAS). The male genital organs are extremely radiosensitive and the action of radiation in the testes can significantly affect spermatogenesis. In search of potential radioprotective for male genital system, this study investigated whether the AT1 receptor antagonists minimize radiation-induced damage to reproductive tissues, by decreasing oxidative stress. Male Wistar rats were divided into six groups: 0 Gray (Gy) (control), 5 Gy (single dose in the scrotal area), telmisartan, losartan, 5Gy+telmisartan and 5Gy+losartan....
Tipo: Journal article
Palavras-chave: Ionizing radiation; Testicular ultrastructure; Spermatogenesis; Renin-angiotensin system; Oxidative stress; Angiotensin II type 1 receptor blockers.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300005

Effect of Flutamide in Mouse Spermatogenesis and on the Function of Seminal Vesicle and Prostate
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Esponda,Pedro; Sarabia,Luis.
The spermatogenesis is regulated by the hypotalamus-hypophysis gonadal axis, and the androgens play a fundamental role in their last stages. The administration of the antiandrogen flutamide interferes with the function of androgen dependent organs (Prostate (P) and Seminal Vesicle (VS)). In this study flutamide (10mg/Kg b.w.) was injected to 10 mice and vehicle to the controls (n=6). The mice were sacrificed at 24 (n=5) and 72 (n=5) hours. In testicular sections the tubular diameter (TD) and height of seminiferous epithelium (EH) were measured. P and VS were macerated, and concentrations of fructose (VS) and zinc (P) were determined. No significant difference exists in the DT among the groups. However, the 72 hrs group showed EH higher than the control (p...
Tipo: Journal article
Palavras-chave: Flutamide; Mouse; Spermatogenesis; Seminal vesicles; Prostate.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300008

Ultrastructural Aspects of Spermatogenesis in Phalloceros caudimaculatus (Teleostei, Poeciliidae)
Provedor de dados: 77
Autores: Vicentini,Carlos Alberto; Muñoz,Mario Esteban; Vicentini,Irene Bastos Franceschini.
The aim of the present study was to analyze the ultrastructural aspects of spermatogenesis in Phalloceros caudimaculatus, during cell proliferation. The parenchyma is organized morphologically as lobular restricted spermatogonial testis. Spermiogenesis in this species is characterized by four morphological stages of development (spermatids S1 through S4). The mature spermatids and spermatozoa heads are situated at the periphery of the cyst surrounded by the cytoplasm of the Sertoli cells. The germ cell's ultrastructure and spermatogenesis in P. caudimaculatus are very similar to that of other poeciliids.
Tipo: Journal article
Palavras-chave: Spermatogenesis; Ultrastructure; Poeciliidae; Phalloceros caudimaculatus.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300047

Toxicological studies of Momordica charantia Linn Seed extracts in Male Mice
Provedor de dados: 77
Autores: Patil,Sharanabasappa A; Patil,Saraswati B.
An attempt to find out the male contraceptive molecule of plant origin, the extracts of seeds of Momordica charantia were tested in male mice. Petroleum ether, chloroform and ethanolic extracts of Momordica charantia were administered at the dose level of 25mg/100gm body weight to the albino mice for 48 days intraperitoneally. All the extracts showed antispermatogenic effect as the number of spermatogonia, spermatocytes, spermatids and spermatozoa were decreased. The increase in the weight of epididymis, prostate gland, seminal vesicle and vas deferens indicates clearly the androgenic property of these extracts. After subjecting to preliminary phytochemical screening ethanol extract showed positive tests for alkaloids, flavonoids, glycosides, phenols,...
Tipo: Journal article
Palavras-chave: Momordica charantia Linn; Toxicological; Androgenic; Testis; Spermatogenesis.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400024

Effect of Prolonged Oral Administration of Aqueous Ficus sycomorus Stem-bark Extract on Testicular Size of Growing Albino Rat
Provedor de dados: 77
Autores: Igbokwe,N. A; Igbokwe,I. O; Sandabe,U. K.
Decoction of Ficus sycomorus stem bark is used to treat infertility involving low sperm counts, but the reproductive risk associated with its use is uncertain. The aqueous stem-bark extract was orally administered at 200-600 mg/kg for 30 days to post-pubertal growing albino rats. Within the period, the live body weights, scrotal diameters and testicular size parameters were estimated. The mean live body weight, scrotal diameter of the control and treated rats significantly (p&lt;0.05) increased as the animals grew, but the treatment did not significantly (p&gt;0.05) affect the parameters. There were no significant (p&gt;0.05) variations in mean testicular size parameters in treated and control rats, and no dose-dependent nor time-dependent effects...
Tipo: Journal article
Palavras-chave: Ficus sycomorus extract; Testicular size; Testicular histopathology; Spermatogenesis; Male reproductive risk.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400052

Angiotensin-converting enzyme inhibitors of Bothrops jararaca snake venom affect the structure of mice seminiferous epithelium
Provedor de dados: 80
Autores: Alberto-Silva,Carlos; Gilio,Joyce M; Portaro,Fernanda C. V.; Querobino,Samyr M.; Camargo,Antonio C. M.
Background Considering the similarity between the testis-specific isoform of angiotensin-converting enzyme and the C-terminal catalytic domain of somatic ACE as well as the structural and functional variability of its natural inhibitors, known as bradykinin-potentiating peptides (BPPs), the effects of different synthetic peptides, BPP-10c (&lt;ENWPHQIPP), BPP-11e (&lt;EARPPHPPIPP), BPP-AP (&lt;EARPPHPPIPPAP) and captopril were evaluated in the seminiferous epithelium of male mice.Methods The adult animals received either one of the synthetic peptides or captopril (120 nmol/dose per testis) via injection into the testicular parenchyma. After seven days, the mice were sacrificed, and the testes were collected for histopathological evaluation.Results BPP-10c...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: B. jararaca; Bradykinin-potentiating peptides; Angiotensin-converting enzyme; Seminiferous epithelium; Spermatogenesis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100338

Reproductive system and spermatozoa ultrastructure support the phylogenetic proximity of Megadasys and Crasiella (Gastrotricha, Macrodasyida)
Provedor de dados: 16
Autores: Guidi, L.; Todaro, M.A.; Ferraguti, M.; Balsamo, M.
The reproductive system and the spermatozoon of Megadasys sterreri from Lanzarote (Canary Islands, Spain) were studied at structural and ultrastructural levels. The species is a simultaneous hermaphrodite with cross-fertilization and shows paired gonads, the male anterior and the female posterior, and both gametes mature in a caudo-cephalic direction. Sperm ducts converge on the midline and open into a ventral common pore. Two sexual accessory organs are present in the caudal trunk. A pipe-like frontal organ lies between the ovaries and the caudal organ, and is composed of a long, thin region connected to a large zone containing mature and degenerating spermatozoa. The cigar-like caudal organ is elongate, bulky and is made of an anterior glandulo-muscular...
Tipo: Article / Letter to the editor
Palavras-chave: Cephalodasyidae; Phylogeny; Planodasyidae; Reproductive traits; Spermatogenesis; 42.79; 42.62.
Ano: 2014
URL: http://www.repository.naturalis.nl/record/471589

Gametogenesis and reproductive cycle of Melanorivulusaff. punctatus (Boulenger, 1895) (Cyprinodontiformes, Rivulidae) in Chapada dos Guimarães, Mato Grosso, Brazil
Provedor de dados: 83
Autores: Cassel,Mônica; Mehanna,Mahmoud; Mateus,Lúcia; Ferreira,Adelina.
The comprehension of the reproductive cycle allows to understand which are the morphological changes that develop in the gonad during this interval. Thus, many studies have been undertaken in order to describe and classify the stages of gonadal development and reproductive status of Neotropical fishes. For this purpose, specimens of Melanorivulusaff. punctatus were collected in a permanent dam in Chapada dos Guimarães, Mato Grosso, Brazil. The gonads were prepared for analysis by light microscopy. The oogenesis and spermatogenesis have been described, characterizing the stages of gonadal development, together with assessments of the gonadosomatic ratio, germ cell count and verification of variation of mature oocytes in females. Throughout the year the male...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonadossomatic ratio; Histology; Oogenesis; Spermatogenesis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100179

Reproductive cycle of the Neotropical cichlid yellow peacock bass Cichla kelberi: A novel pattern of testicular development
Provedor de dados: 83
Autores: Siqueira-Silva,Diógenes Henrique de; Vicentini,Carlos Alberto; Ninhaus-Silveira,Alexandre; Veríssimo-Silveira,Rosicleire.
The present study describes the testicular maturation phases (associating the germ cells development and the morphological changes suffered by the germinal epithelium along the whole year), and the testicular morphology in the yellow peacock bass Cichla kelberi, relating it to other species. For this purpose, 78 specimens were studied according conventional techniques of light microscope. The testes in C. kelberi were classified as unrestricted spermatogonial lobular, an apomorphic characteristic in the recent groups of Teleost. Furthermore, were defined five testicular maturation phases: Preparatory phase; Early Germinal Epithelium Development; Mid Germinal Epithelium Development; Late Germinal Epithelium Development and; Regression. Similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germinal epithelium; Gonadal maturation; Reproductive phases; Spermatogenesis; Testes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300587

Annual male reproductive activity and stages of the seminiferous epithelium cycle of the large fruit-eating Artibeus lituratus (Chiroptera: Phyllostomidae)
Provedor de dados: 103
Autores: Notini,Alice A.; Farias,Talita O.; Talamoni,Sônia A.; Godinho,Hugo P.
The large fruit-eating phyllostomid bat, Artibeus lituratus (Olfers, 1818), forearm 69-75 mm, body mass 66-82 g, has a diversified geographic distribution in the Neotropical region. Therefore it is subjected to different climatic conditions that affect its reproduction, leading to different reproductive strategies such as continuous reproduction, seasonal monoestry or seasonal bimodal polyestry. In this study we used morphometric and histological methods to analyze the annual reproductive activity of A. lituratus males in a population living in the Atlantic Forest, Southeastern Brazil. Testis mass, epididymis mass, gonadosomatic index, seminiferous tubule diameter, and Leydig cell nucleus diameter showed no significant differences (p &gt; 0.05) in the two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphometry; Neotropical bat; Seminiferous epithelium; Spermatogenesis; Reproduction.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000300195

Reproductive apparatus and gametogenesis of Lophiosilurus alexandri Steindachner (Pisces, Teleostei, Siluriformes)
Provedor de dados: 104
Autores: Barros,Marcelo D. M.; Guimarães-Cruz,Rodrigo J.; Veloso-Júnior,Vanderlei C.; Santos,José E. dos.
The gonad morphology and gametogenesis of Lophiosilurus alexandri Steindachner, 1877 from Santo Antônio river (Minas Gerais, Brazil) were studied through anatomical and histological techniques. Examination of the testis revealed that they were paired, fringed organs with two distinct regions: cranial spermatogenic and caudal spermatogenic and secretory. The cranial region represents ca. 60% of the mature/maturing testis, containing 41 to 73 fringes, while the caudal portion represents ca. 40% and contains 44 to 68 fringes. At the cranial portion the length of the fringes was 3.70 ± 1.70 mm and in the caudal portion was 0.20 ± 0.10 mm. The spermatogenesis was cystic, synchronic, and occurred throughout the whole extension of the seminiferous tubules. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonads; Morphology; Oogenesis; Pseudopimelodidae; Spermatogenesis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000100028

Puberty in male collared peccary (Pecari tajacu) determined by quantitative analysis of spermatogenic cells
Provedor de dados: 36
Autores: Guimarães,Diva Anelie; Cardoso,Deise de Lima; Ferreira,Maria Auxiliadora Pantoja; Albuquerque,Natália Inagaki de.
Biological studies are necessary for the management of wildlife in captivity, and knowledge of reproduction is one of the important features for increasing production. The objective of the research was to determine the age at which male collared peccaries reach puberty. Testicular samples of 15 animals, aged 7 to 16 months, distributed into five groups (G1, G2, G3, G4 and G5) were used. The testes showed considerably increased weight, length and width (p &lt; 0.05) from G1 to G3, whereas, from this group onward, the development of this organ was slower. There was positive correlation (p &lt; 0.001) between the following testicular parameters: weight and length (r = 0.97), weight and width (r = 0.88), length and width (r = 0.92). Regarding the diameter of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reproduction; Testicles; Spermatogenesis; Tayassuidae.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000100012

Opioid system manipulation during testicular development: results on sperm production and sertoli cells population - doi: 10.4025/actascibiolsci.v33i2.5940
Provedor de dados: 3
Autores: Cajú, Fernanda Mafra; Universidade Federal Rural de Pernambuco; Queiroz, Gian Carlo D'Angelo; Universidade Federal Rural de Pernambuco; Torres, Sandra Maria; Universidade Federal Rural de Pernambuco; Tenório, Bruno Mendes; Universidade Federal Rural de Pernambuco; Silva Júnior, Valdemiro Amaro; Universidade Federal Rural de Pernambuco.
The Sertoli cell has fundamental importance to the development and maintenance of spermatogenesis, as well as it has a directly proportional numerical relationship to sperm production. The proliferative period of this cell in rats occurs between 13 days pre-natal and 21 days pos-natal, when is established the final population in adult animals. The Leydig cell can modulate the Sertoli cell proliferation during fetal and neonatal period through &amp;beta;-endorphin. The manipulation of opioidergic system can promote changes in parameters related to development of nervous, endocrine and reproductive systems. By the way, the main purpose of this present work was to compare the effects of the blockade of opioid receptor blocking in Sertoli cells using...
Tipo: Estudo histomorfológico
Palavras-chave: 2.06.00.00-3; 2.06.03.00-2; 2.07.02.00-0 Naltrexone; Testis development; Spermatogenesis; Wistar rats Morfologia; Histologia; Fisiologia de Órgão e Sistemas Naltrexone; Testis development; Spermatogenesis; Wistar rats.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5940

Experimental exposure to 3-monochloropropane-1,2-diol from the pre-puberty causes damage in sperm production and motility in adulthood
Provedor de dados: 3
Autores: Vieira, Kátia Cristina Melo Tavares; Favareto, Ana Paula Alves.
3-Monochloropropane-1,2-diol (3-MCPD) is a food contaminant that can be formed during the thermic processing of various foodstuffs. Studies of reproductive toxicology of 3-MCPD are mainly concentrated in the evaluation of possible insults caused by exposure of adult animals. However, the prepuberty might be a period of different susceptibility to chemicals. The aim of this study was to evaluate the effects on reproductive endpoints of the 3-MCPD-exposure prepubertal male rats. Wistar male rats were assigned to 4 groups: control and exposed to 2.5; 5 or 10 mg kg-1 day-1 of 3-MCPD for 30 days by gavage. Testis and epididymis were used for sperm counts and histology analysis. Sertoli cell number and dynamic of the spermatogenesis were evaluated. Sperm were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.06.00.00-3 monochloropropanol; Puberty; Rats; Spermatogenesis; Reproduction. Morfologia.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31323

Effect of pinealectomy, adrenalectomy, pinealectomy plus adrenalectomy upon the quantification of spermatogenic cells of adult rats
Provedor de dados: 45
Autores: Castro,A.C.S.; Queiroz,G.F.; Nogueira,J.C.; Coimbra,C.C.; Reis,A.M.; Marubayashi,U.; Yamasaki,K.
The objectives of this study were to evaluate the effects of pinealectomy, adrenalectomy and pinealectomy-adrenalectomy upon the quantification of spermatogenic cells of rats. As such, 32 adult Wistar rats with a mean body weight of 331.7± 15.5g were assigned into one of the following treatments: (a) a sham-operated control group, consisting of nine animals; (b) ten pinealectomized animals; (c) seven adrenalectomized animals and (d) six pinealectomized plus adrenalectomized animals. No significant differences were observed between groups for the following parameters: body, testes, prostate and seminal vesicle weights, seminiferous tubular diameter, number of cells per seminiferous tubular cross sections (primary spermatocytes at pachytene, round...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Pinealectomy; Adrenalectomy; Rat.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352002000300008

Sperm ultrastructure and spermatogenesis in the lizard, Tropidurus itambere
Provedor de dados: 47
Autores: Ferreira,Adelina; Dolder,Heidi.
Spermatogenesis, with emphasis on spermiogenesis, is described for the lizard, Tropidurus itambere, using light microscopy, phase contrast and epifluorescence, as well as scanning and transmission electron microscopy. Cellular differentiation involves events of chromatin condensation, nuclear elongation and the formation of structural complexes, such as the acrosomal and axonemal ones. Other new characteristics, exclusive for this species, include various aspects of the subacrosomal granule, the insertion of the pro-acrosomal vesicle and the development of these structures to participate in the acrosomal complex. Radial projections occur just above the nuclear shoulders, which have been recognized already from the beginning of cellular elongation. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Sperm; Spermatogenesis; Lizard; Tropiduridae.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000300006

Seasonal testicular changes in Dendropsophus minutus Peters, 1872 (Anura, Hylidae)
Provedor de dados: 47
Autores: Ferreira,Adelina; Mehanna,Mahmoud.
The reproductive cycle in anurans may be either continuous or discontinuous. These differences may be connected to seasonal climate changes and/or to anthropic activity. Forty adult male individuals of the Dendropsophus minutus species were collected during one year, in the municipality of Chapada dos Guimarães (Mato Grosso, Brazil). The testicles were studied under light and transmission electron microscopy. No variations were observed when the diameter of the seminiferous tubules and the thickness of the interstitial tissue were studied. However, changes in spermatogenesis were conspicuous and indicated that the reproductive cycle of D. minutus in Chapada dos Guimarães is discontinuous and seems related to variations in air temperature and rainfall.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Reproduction; Anura; Ultrastructure; Chapada dos Guimarães.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452012000200002

Morphologic and morphometric analysis of testis of Pseudis limellum (Cope, 1862) (Anura, Hylidae) during the reproductive cycle in the Pantanal, Brazil
Provedor de dados: 47
Autores: Ferreira,Adelina; Mehanna,Mahmoud; Prado,Cynthia P. A.
The spermatogenesis of Pseudis limellum, from the Southern Pantanal, Brazil, was studied from July 1995 to May 1996, through histological sections of the testis. The cells could be differentiated as: primary spermatogonia, large cells, generally with bilobed nucleus; secondary spermatogonia, smaller cells, with darker cytoplasm, chromatin of radial form; primary and secondary spermatocytes, differentiated according to the different stages of the nucleus during the successive cells divisions. Furthermore, we observed cells in process of morphologic differentiation: rounded spermatids much smaller, with nucleus containing chromatin in compacting process and cytoplasm reduction; elongated spermatids, generally parallel organized in well defined bundles, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Male; Amphibia; Climatic influences.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452008000200004

Morphological study of the spermatogenesis in the teleost Piaractus mesopotamicus
Provedor de dados: 47
Autores: da Cruz-Landim,Carminda; Camargo Abdalla,Fábio; da Cruz-Höfling,Maria Alice.
The spermatogenesis of Piaractus mesopotamicus was investigated under light and transmission electron microscopy. The specimens were captured from their natural environment (Rio Miranda and Rio Aquidauana, Pantanal Matogrossense, Brazil) during April and September. The results were compared with the spermatogenic data of specimens under captivity condition. In both conditions, P. mesopotamicus presented the typical spermatogenesis pattern of the teleost fishes, showing no significative differences. The spermatozoon was classified as type I, which has a globular head without acrosome, a short middle piece and a long tail constituted only by the flagellum. This type of spermatozoon is considered the basic type in fishes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piaractus mesopotamicus; Spermatogenesis; Spermatogonia; Spermiogenesis; Teleostei.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000300003

An integrative view to structure, function, ontogeny and phylogenetical significance of the male genital system in Pomacea canaliculata (Caenogastropoda, Ampullariidae)
Provedor de dados: 47
Autores: Gamarra-Luques,C.; Winik,B.C.; Vega,I.A.; Albrecht,E.A.; Catalan,N.M.; Castro-Vazquez,A.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Steroids; Peptides; Imposex; Xenobiotics.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000200012

Testosterone production and spermatogenic damage induced by organophosphorate pesticides
Provedor de dados: 47
Autores: Contreras,H.R.; Paredes,V.; Urquieta,B.; Del Valle,L.; Bustos-Obregón,E.
ParathionÒ is an organophosphorate pesticide amply used in agriculture. Many alterations induced by organophosphorate pesticides have been described, such as: cytogenetic alterations in germinal cells, oligozoospermia and teratozoospermia in the mouse. The effect of ParathionÒ, both pure (PP) and commercial (PC), on mouse interstitial cell testosterone production was evaluated in vivo and in vitro. Male mice were intraperitoneally injected with a single dose of 1/3 LD50 of ParathionÒ, both PP and PC. The animals were sacrificed at 1, 8 and 40 days post injection to evaluate the impact of disrupting testosterone production on spermatogonia, spermatocytes and elongated spermatids. The plasma testosterone was assayed by standard radioimmunoanalysis. The same...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Steroidogenesis; Spermatogenesis; Pesticide; ParathionÒ.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000300002

The effects of Tynnanthus fasciculatus (Bignoniaceae) infusion on testicular parenchyma of adult Wistar rats
Provedor de dados: 48
Autores: Melo,Fabiana C. S. A; Matta,Sérgio L. P; Paula,Tarcízio A. R; Gomes,Marcos L. M; Oliveira,Luciana C.
Traditional medicine provides strong guidance for scientific experiments involving plant products used by the Brazilian people. The species "cipó-cravo" (Tynnanthus fasciculatus) is a plant commonly used either to combat indigestion and stomachaches, or as a general stimulant and aphrodisiac. In this study, the effects of "cipó-cravo" infusion were investigated within the testicular parenchyma of adult Wistar rats. Rats were divided into 3 groups: a control (distilled water) and two treated groups, which received the plant infusion (100 and 200mg/animal/day). The 200mg dose promoted a significant increase of the testicular parenchyma weight and of the volume and total length of the seminiferous tubules, as well as in total daily sperm production and sperm...
Tipo: Journal article
Palavras-chave: Germ cell; Sertoli cell; Sperm production; Spermatogenesis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400009

Differential expression and localization of ADAM10 and ADAM17 during rat spermatogenesis suggest a role in germ cell differentiation
Provedor de dados: 48
Autores: Urriola-Muñoz,Paulina; Lizama,Carlos; Lagos-Cabré,Raúl; Reyes,Juan G; Moreno,Ricardo D.
BACKGROUND: Extracellular metolloproteases have been implied in different process such as cell death, differentiation and migration. Membrane-bound metalloproteases of the ADAM family shed the extracellular domain of many cytokines and receptor controlling auto and para/juxtacrine cell signaling in different tissues. ADAM17 and ADAM10 are two members of this family surface metalloproteases involved in germ cell apoptosis during the first wave of spermatogenesis in the rat, but they have other signaling functions in somatic tissues. RESULTS: In an attempt to further study these two enzymes, we describe the presence and localization in adult male rats. Results showed that both enzymes are detected in germ and Sertoli cells during all the stages of...
Tipo: Journal article
Palavras-chave: Testis; Spermatogenesis; Apoptosis; Paracrine; Metalloproteinase.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100031

Association of the infusion of Heteropterys aphrodisiaca and endurance training brings spermatogenetic advantages
Provedor de dados: 48
Autores: Gomes,Marcos L M; Monteiro,Juliana C; Freitas,Karine M; Sbervelheri,Mariana M; Dolder,Heidi.
The species Heteropterys aphrodisiaca is commonly used as a stimulant by popular medicine in the Cerrado, a savanna-like biome, Brazil. Recent studies have proved its protective effects on testes of animals submitted to treatment using Cyclosporine A, as well as its stimulus effect in increasing testosterone secretion. Therefore, the present study was designed to analyze whether the association of the plant infusion and endurance exercise could potentiate the stimulating effect. The animals were separated into 4 groups: two control (sedentary and trained) receiving water and two treated (sedentary and trained) receiving the plant infusion daily (104mg/day). The proportion of the seminiferous tubule compartment and interstitium was analyzed. Within the...
Tipo: Journal article
Palavras-chave: Germ cells; Phytotherapy; Seminiferous epithelium; Spermatogenesis; Testosterone.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000300004

Contribution of environmental pollutants to male infertily: A working model of germ cell apoptosis induced by plasticizers
Provedor de dados: 48
Autores: Lagos-Cabré,Raúl; Moreno,Ricardo D.
Bisphenol A [2,2-bis(4-hydroxyphenyl)propane] (BPA), 4-nonylphenol (NP) and di(2-ethylhexyl)phthalate (DEHP), and its metabolite mono-2-ethylhexyl phthalate (MEHP) are chemicals found in plastics, which act as endocrine disruptors (EDs) in animals, including human. EDs act like hormones in the endocrine system, and disrupt the physiologic function of endogenous hormones. Most people are exposed to different endocrine disruptors and concern has been raised about their true effect on reproductive organs. In the testis, they seem to preferentially attack developing testis during puberty rather than adult organs. However, the lack of information about the molecular mechanism, and the apparently controversial effect observed in different models has hampered the...
Tipo: Journal article
Palavras-chave: Testis; Spermatogenesis; Bisphenol A; Nonylphenol; ADAM17.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000100001

Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
Provedor de dados: 48
Autores: GALLARDO,MILTON H; GARRIDO,ORLANDO; BAHAMONDE,RAÚL; GONZÁLEZ,MARCELO.
Nucleotypic effects link DNA content with nuclear size and cell dimensions of reproductive cells in polyploid organisms. We studied the gametogenesis of the allotetraploid rodent Tympanoctomys barrerae, aiming to determine these effects in reproductive cells. The species' cofamily members, Octodon degus and Spalacopus cyanus were used as control. Spermatogenesis and oogenesis in T. barrerae follows the pattern of differentiation and sequence of events of the control species, but varied nucleotypic effects were observed. Exceedingly large, spatulated spermatozoa with a submedially attached flagellum are characteristic of male T. barrerae. The diameter of the nuclei of primordial and growing follicles as well as those of the Graaff follicles, of the...
Tipo: Journal article
Palavras-chave: Nucleotypic effects; Oogenesis; Spermatogenesis; Octodontidae; Tympanoctomys barrerae; Tetraploidy.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500006

Effects of catuaba cristal® on the testis of wistar rats
Provedor de dados: 52
Autores: Freitas,Karine Moura de; Costa,Kyvia Lugate; Campos,Pamela Kelly Araújo; Melo,Fabiana Cristina Silveira Alves de; Paula,Tarcízio Antônio Rego de; Matta,Sérgio Luis Pinto da.
The aim of this study was to evaluate the possible beneficial effects of Catuaba Cristal® (CC), an alcoholic drink made from wine and Erythroxylum catuaba Ar. Cam on testis. Wistar rats either received CC solution (n=8) or water (n=9). Results showed significant body weight reduction within the CC group, although, no weight changes were observed for liver, kidney, testis, epididymis, seminal vesicle and prostate. The volumetric proportion and volume of interstitial tissue and lymphatic space were reduced in the treated group. In the CC group, although the nuclear volume of Leydig cells (LC) decreased, the number of LC per testis increased. These results suggested that CC had no beneficial effect on spermatogenesis of Wistar rats.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphrodisiac drink; Medicinal plants; Morphometry; Spermatogenesis; Testis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500007

Cat, cougar, and jaguar spermatogenesis: a comparative analysis
Provedor de dados: 52
Autores: Costa,Deiler Sampaio; Paula,Tarcízio Antônio Rêgo; Matta,Sérgio Luiz Pinto da.
This work presents a comparative review about the spermatogenic process in cats (Felis domestica), jaguars (Panthera onca) and cougars (Puma concolor), with emphasis on testicular biometry, gonadossomatic index, volumetric proportion of testicular parenchyma components, tubular diameter, seminiferous epithelial height and seminiferous tubule length. It was an approach of the differences among the cell proportions that allowed conclusions about the overall yield of spermatogenic process and Sertoli cell index in three feline species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Felines; Testis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000600006

Microscopic morphology and testis morphometry of captivity-bred Adult bullfrogs (Lithobates catesbeianus Shaw, 1802)
Provedor de dados: 52
Autores: Carlos,Jaqueline; Matta,Sérgio Luis Pinto da.
The aim of this work was to study the testicular morphometry of captivity-bred adult bullfrogs. Fifteen young adult male were studied, in the rainy season and a lengthy photoperiod. The GSI was established at 0.15%. The nuclear diameter of germinative and Leydig cells, the nucleolus diameter of Sertoli cells and the area of cysts and tubules were determined and the mean number of ISPC, IISPC and SPT per cyst and the mean number of cysts per tubule was estimated. The nucleoplasmatic proportion of the nucleus of the Leydig cell was 76.22%, indicating less cytoplasmic activity. Eight generations of spermatogonia were found. The spermatogenesis efficiency in meiosis and in mitosis was 63 and 49%, respectively. The spermatogenesis of bullfrog fited in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Sertoli; Leydig; GSI.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600018

Sperm Quality and Testicular Histomorphometry of Wistar Rats Supplemented with Extract and Fractions of Fruit of Tribulus terrestris L.
Provedor de dados: 52
Autores: Oliveira,Nelma Neylanne Pinho Muniz; Félix,Matheus Augusto Rodrigues; Pereira,Tauany Costa Silva; Rocha,Luiz Gustavo Pessoa; Miranda,José Rafael; Zangeronimo,Márcio Gilberto; Pinto,José Eduardo Brasil Pereira; Bertolucci,Suzan Kelly Vilela; Sousa,Raimundo Vicente de.
ABSTRACT The aim of this study was to assess the sperm quality and testicular histomorphometry of Wistar rats supplemented with extract and fractions of fruits of Tribulus terrestris L. The ethanolic extract was obtained by dynamic maceration of spray-dried fruit. This extract was fractionated by liquid-liquid partition, using increasing polarity solvents. Twenty male rats were separated in four groups, with five rats in each group. The control was supplemented with distilled water, while the others were daily given the ethanolic extract, hexanic or aqueous fraction soluble in methanol in a dose of 42 mg.kg-1.day-1 for 70 days. Sperm was obtained from the right epididymal tail for the analysis of motility, count, morphology and viability. The testicular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vegetal extract; Spermatogenesis; Leydig cells.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000600891

Decreased spermatogenic and androgenic testicular functions in adult rats submitted to immobilization-induced stress from prepuberty
Provedor de dados: 56
Autores: Almeida,S.A.; Petenusci,S.O.; Anselmo-Franci,J.A.; Rosa-e-Silva,A.A.M.; Lamano-Carvalho,T.L.
We investigated whether chronic stress applied from prepuberty to full sexual maturity interferes with spermatogenic and androgenic testicular functions. Male Wistar rats (40 days old) were immobilized 6 h a day for 60 days. Following immobilization, plasma concentrations of corticosterone and prolactin increased 135% and 48%, respectively, while plasma luteinizing hormone and testosterone presented a significant decrease of 29% and 37%, respectively. Plasma concentration of follicle-stimulating hormone was not altered in stressed rats. Chronic stress reduced the amount of mature spermatids in the testis by 16% and the spermatozoon concentration in the cauda epididymidis by 32%. A 17% reduction in weight and a 42% decrease in DNA content were observed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Immobilization; Spermatogenesis; LH; FSH; Testosterone; Prolactin.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100013

Plasma and testicular testosterone levels, volume density and number of Leydig cells and spermatogenic efficiency of rabbits
Provedor de dados: 56
Autores: Castro,A.C.S.; Berndtson,W.E.; Cardoso,F.M.
Plasma and tissue testosterone concentrations were determined by radioimmunoassay in 12 eight-month-old sexually mature New Zealand White rabbits and evaluated for possible associations with spermatogenic efficiency as well as with volume density and number of Leydig cells. Testicular tissue was processed histologically and histometry was performed in order to quantify germ cells, Sertoli cells and Leydig cells. Spermatogenic efficiency, reported as the ratios among germ cells (spermatogonia, primary spermatocytes and round spermatids) and by the ratio of germ cells to Sertoli cells, was not associated with testosterone levels. However, Leydig cell parameters such as number of Leydig cells per gram of testis, total number of Leydig cells per testis and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rabbit; Testosterone; Leydig cell; Spermatogenesis; Histometry.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000400014