Consulta: subjectFacets:"Estradiol"
Registros recuperados: 33
Data/hora: 06/06/2024 05:39:09

Grasa de sobrepaso en ovejas con diferente  espesor de grasa dorsal y su respuesta en el estro sincronizado, perfil endocrino, porcentaje de gestación y prolificidad.
Provedor de dados: 32
Autores: Nieto Aquino, Rafael.
El objetivo de este estudio fue evaluar el efecto de la grasa de sobrepaso en el estro  sincronizado, porcentaje de gestación y prolificidad en ovejas con baja y alta grasa  dorsal, y su respuesta en hormona luteinizante (LH), estradiol (E2), progesterona (P4) e  insulina (INS). Se utilizaron 59 ovejas, con diferente espesor de grasa dorsal, bajo  (EGb) y alto (EGa), que se subdividieron en grupos: sin (EGbSg, n = 16) y con (EGbCg,  n = 14) la adición de 150 g de grasa de sobrepaso; y sin (EGaSg, n = 14) y con  (EGaCg, n = 15) la adición de 150 g de grasa de sobrepaso, respectivamente. Se  sincronizaron con esponjas de FGA (20 mg), por 12 d, a diez días de su inserción se  aplicaron 15 mg de PGF2α. No se encontraron diferencias (P &gt; 0.05) para las...
Palavras-chave: Ultrasonografía; Insulina; Progesterona; Estradiol; Hormona luteinizante. Ultrasonagraphy; Insulin; Progesterone; Estradiol; Luteinizing hormone.
Ano: 2012
URL: http://hdl.handle.net/10521/882

Grasa de sobrepaso en ovejas con diferente  espesor de grasa dorsal y su respuesta en el estro sincronizado, perfil endocrino, porcentaje de gestación y prolificidad.
Provedor de dados: 32
Autores: Nieto Aquino, Rafael.
El objetivo de este estudio fue evaluar el efecto de la grasa de sobrepaso en el estro  sincronizado, porcentaje de gestación y prolificidad en ovejas con baja y alta grasa  dorsal, y su respuesta en hormona luteinizante (LH), estradiol (E2), progesterona (P4) e  insulina (INS). Se utilizaron 59 ovejas, con diferente espesor de grasa dorsal, bajo  (EGb) y alto (EGa), que se subdividieron en grupos: sin (EGbSg, n = 16) y con (EGbCg,  n = 14) la adición de 150 g de grasa de sobrepaso; y sin (EGaSg, n = 14) y con  (EGaCg, n = 15) la adición de 150 g de grasa de sobrepaso, respectivamente. Se  sincronizaron con esponjas de FGA (20 mg), por 12 d, a diez días de su inserción se  aplicaron 15 mg de PGF2α. No se encontraron diferencias (P &gt; 0.05) para las...
Palavras-chave: Ultrasonografía; Insulina; Progesterona; Estradiol; Hormona luteinizante. Ultrasonagraphy; Insulin; Progesterone; Estradiol; Luteinizing hormone.
Ano: 2012
URL: http://hdl.handle.net/10521/815

Grasa de sobrepeso en ovejas con diferente  espesor de grasa dorsal y su respuesta en el estro sincronizado, perfil endocrino, porcentaje de gestación y prolificidad.
Provedor de dados: 32
Autores: Nieto Aquino, Rafael.
El objetivo de este estudio fue evaluar el efecto de la grasa de sobrepaso en el estro  sincronizado, porcentaje de gestación y prolificidad en ovejas con baja y alta grasa  dorsal, y su respuesta en hormona luteinizante (LH), estradiol (E2), progesterona (P4) e  insulina (INS). Se utilizaron 59 ovejas, con diferente espesor de grasa dorsal, bajo  (EGb) y alto (EGa), que se subdividieron en grupos: sin (EGbSg, n = 16) y con (EGbCg,  n = 14) la adición de 150 g de grasa de sobrepaso; y sin (EGaSg, n = 14) y con  (EGaCg, n = 15) la adición de 150 g de grasa de sobrepaso, respectivamente. Se  sincronizaron con esponjas de FGA (20 mg), por 12 d, a diez días de su inserción se  aplicaron 15 mg de PGF2α. No se encontraron diferencias (P &gt; 0.05) para las...
Tipo: Tesis
Palavras-chave: Ultrasonografía; Insulina; Progesterona; Hormona luteinizante.; Maestría; Ganadería; Ultrasonagraphy; Insulin; Progesterone; Estradiol; Luteinizing hormone.
Ano: 2009
URL: http://hdl.handle.net/10521/1210

Comparação de protocolos de 8 e 9 dias de duração à base de estradiol e progesterona em vacas submetidas à inseminação artificial em blocos.
Provedor de dados: 14
Autores: PFEIFER, L. F. M.; CESTARO, J. P.; NEVES, P. M. A.; ANDRADE, J. S. de; CASTRO, N. A. de.
No presente estudo, foram comparados dois dos protocolos mais utilizados de IATF para vacas Nelore lactantes no Brasil na técnica IAB com o objetivo de avaliar: 1) se a utilização de IAB em protocolos, baseados no uso de estradiol e progesterona, com 9d é tão efetiva quanto em protocolos com 8d de duração, e; 2) o efeito da categoria animal na fertilidade de vacas inseminadas em Blocos.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Inseminação em bloco; Jaru (RO); Rondônia; Amazônia Ocidental; Western Amazon; Reprodução Animal; Gado Nelore; Vaca; Inseminação Artificial; Controle Hormonal; Estradiol; Progesterona; Animal reproduction; Nellore; Cows; Artificial insemination; Genetic techniques and protocols; Hormonal regulation; Progesterone.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1125215

Temporal study of estrogenic responses of mussel (Mytilus galloprovinciallis) extracts applied to reporter cell lines
Provedor de dados: 5
Autores: David, A; Dagnino, S; Pichot, Yves; Munaron, Dominique; Escande, A; Casellas, C; Fenet, H; Gomez, E.
In vitro bioassays would facilitate monitoring of estrogen-like compounds in mussels (Mytilus galloprovincialis) since they tend to accumulate lipophilic compounds in their fat and muscle tissue. However, estradiol (E2) steroid (already identified in mussels) could induce false positive responses. This study focuses on temporal variability in estrogenic responses of mussel extracts and the possible relation of this response with E2 levels. The reproductive cycle and growth were thus monitored for six months in sexed mussels. E2 levels were similar between genders and these levels varied with reproductive stages. human estrogen receptor (hER) activities were similar at all stages except in February. E2 present in male and female extracts accounted for part...
Tipo: Text
Palavras-chave: ELISA; Reporter cell lines; Mytilus galloprovinciallis; Estradiol; Biomonitoring.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4578.pdf

Variation of vaginal cytology, progesterone and estradiol metabolites in Seba's short-tailed fruit bat during the estrous cycle and gestation
Provedor de dados: 81
Aunque el análisis de las hormonas reproductivas provee información precisa acerca de la reproducción, la endocrinología reproductiva sigue siendo aún poco estudiada en la mayoría de la fauna silvestre debido a las dificultades de obtener y conservar muestras biológicas. En este estudio se examinaron las diferencias en los metabolitos de hormonas en materia fecal (progesterona y estradiol) en diferentes etapas reproductivas, y en particular se examinó la probabilidad de que una hembra de murciélago (Carollia perspicillata) esté en metaestro o preñez al correlacionar la citología vaginal con las concentraciones de hormonas reproducivas. Examinamos cincuenta y cinco hembras colectadas a lo largo de la temporada reproductiva con evidencia de embarazo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carollia; Estradiol; Murciélago; Progesterona; Citología vaginal.
Ano: 2018
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832018000100014

Differential Effect of Follicle-Stimulating Hormone and Estradiol on Expressions of Vascular Endothelial Growth Factor (VEGF) 120, VEGF164 and Their Receptors in Bovine Granulosa Cells
Provedor de dados: 19
Autores: SHIMIZU, Takashi; JAYAWARDANA, Barana C.; TETSUKA, Masafumi; MIYAMOTO, Akio; 清水, 隆; 手塚, 雅文; 宮本, 明夫.
Vascular endothelial growth factor (VEGF) isoforms (VEGF 120 and VEGF 164) secreted by granulosa cells are involved in thecal angiogenesis during follicular development in the bovine ovary. However, whether the transcript of the VEGF120 and VEGF164 isoforms differs during follicular development in the ovary is still unknown. We first examined the gene expression of VEGF120, VEGF164, fms-like tyrosine kinase (Flt-1), and fetal liver kinase (Flk-1) in the granulosa cells (GCs) and theca cells (TCs) of pre-selection and post-selection follicles (PRF and POF respectively) from the bovine ovary. Then we examined the effects of FSH and estradiol (E2) on these factors in cultured bovine GCs. Messenger RNA (mRNA) expression was quantified using real-time PCR...
Palavras-chave: Estradiol; Fetal liver kinase (Flk-1); Fms-like tyrosine kinase (Flt-1); Follicle-stimulating hormone (FSH); Granulosa cell; Vascular Endothelial Growth factor (VEGF).
Ano: 2007
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4057

Desempenho reprodutivo de porcas submetidas a infusões uterinas no início do estro
Provedor de dados: 86
Autores: BORTOLOZZO,FERNANDO PANDOLFO; WENTZ,IVO; BRANDT,GUILHERME; GUIDONI,ANTÔNIO LOURENÇO.
O objetivo deste trabalho foi avaliar o desempenho reprodutivo de porcas multíparas submetidas à infusão uterina de diferentes soluções, realizada no início do estro. Um total de 1.019 fêmeas foram controladas no período de verão (n=570) e inverno (n=449). Os animais foram submetidos a cinco tratamentos, que consistiram em infusão de plasma seminal (PS), sêmen morto (SM), solução de 17beta-estradiol (SE), solução fisiológica (SS) e um grupo-controle (CO). As fêmeas receberam três inseminações: a primeira, 8-12 horas após a detecção do estro, e as demais, nos turnos subseqüentes. Com relação à taxa de retorno ao estro e taxa de parto ajustada, não ocorreram diferenças entre os tratamentos (p&gt;0,05). Na análise do modelo de regressão adotado para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plasma seminal; Sêmen morto; Estradiol; Taxa de parto; Tamanho da leitegada.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000000300019

Desenvolvimento testicular, espermatogênese e concentrações hormonais em touros Angus
Provedor de dados: 96
Autores: Aguiar,Gyselle Viana; Araújo,Airton Alencar; Moura,Arlindo de Alencar Araripe.
Este estudo foi realizado com a finalidade de avaliar a evolução das secreções hormonais e do epitélio seminífero em touros da raça Angus de 10 a 38 semanas de idade. Foram castrados 1 a 5 animais em intervalos de quatro semanas (total de 25 touros) para coleta de amostras do parênquima testicular e do plasma sanguíneo. As variáveis relacionadas ao crescimento testicular, aos aspectos quantitativos da espermatogênese e aos níveis hormonais foram transformadas em logaritmo e avaliadas por meio de análise de variância. O diâmetro dos testículos e túbulos seminíferos e o peso testicular apresentaram variações mais acentuadas após 26 semanas de idade. A porcentagem do parênquima testicular ocupado pelos túbulos seminíferos aumentou de 49,3 para 75,2% durante o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estradiol; Sertoli; Testículos; Testosterona.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982006000600008

Effects of long-term controlled internal drug release reuse on reproductive performance, hormone profiles, and economic profit of sheep
Provedor de dados: 96
Autores: Swelum,Ayman Abdel-Aziz; Saadeldin,Islam M.; Moumen,Abdullah F.; Ali,Mohamed; Ba-Awadh,Hani; Alowaimer,Abdullah N.
ABSTRACT Fifty-seven multiparous Awassi ewes in the breeding season were used to compare the effects of controlled internal drug release (CIDR) reuse on hormone profiles, reproductive performance, and economic production. Ewes were randomly allotted to one of three CIDR treatments: new (control), once-used, and twice-used; treatment lasted 12 days. Blood samples were collected from all groups at the time of CIDR insertion, three and six days following insertion, at withdrawal time, and at insemination. Serum estradiol (E2) and progesterone (P4) concentrations were measured. Timed insemination was performed 48 h post CIDR withdrawal in all groups. Pregnancy was diagnosed by ultrasonography at day 23 post insemination. No significant differences were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conception; Estradiol; Estrus; Progesterone; Synchronization; Twining.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100607

Respostas hormonais ao tratamento com GnRH e estradiol e suas correlações com desenvolvimento testicular e número de células sertoli em touros angus x charolês na fase de pré-puberdade
Provedor de dados: 96
Autores: Moura,Arlindo de Alencar Araripe; Erickson,Bert H.
O objetivo desta pesquisa foi determinar as correlações entre níveis hormonais aos 2 e 6 meses de idade e diâmetro e histologia testicular em tourinhos Angus x Charolês aos 6 meses de idade (n=15). Aos dois meses, duas amostras basais de sangue foram coletadas a intervalos de 1 hora. Após a última coleta, os animais receberam 5 mg de GnRH e 1,5 e 3,0 horas depois novas amostras foram coletadas. Aos seis meses, os tourinhos foram tratados com 1 mg de estradiol benzoato (E) e receberam 10 mg de GnRH doze horas depois. Após cinco dias, os tourinhos receberam 10 mg de GnRH, mas sem pré-tratamento com estradiol. As amostras de sangue foram coletadas 1,5 e 3,0 horas após a injeção de GnRH nas duas ocasiões. Imediatamente antes dos tratamentos com estradiol e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Testículo; FSH; Estradiol; Célula de Sertoli; Tourinhos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35981999000100006

Función reproductiva de sementales ovinos importados de Nueva Zelanda durante su primera época reproductiva en México
Provedor de dados: 108
Autores: Méndez Villalobos,Guadalupe; Jaramillo Escutia,Gerardo; Aragón Martínez,Andrés; Ayala Escobar,María Elena; Domínguez-Vara,Ignacio Arturo.
La importación de sementales de alto valor genético ha sido una estrategia común en México. Sin embargo, debido a que no se le ha dado seguimiento al desempeño reproductivo de tales sementales se llevó a cabo el presente trabajo para realizarlo en sementales Suffolk durante su primera época reproductiva en México (octubre a febrero). El comportamiento de los valores de la circunferencia escrotal, la cuenta y la morfología espermática, así como las concentraciones circulantes de testosterona de los sementales Suffolk durante su primera época reproductiva en México, coinciden con las que se notifican en la literatura para esos animales en otras latitudes, aunque en México son de menor magnitud. Los cambios neuroendocrinos-reproductivos derivados de los...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Función reproductiva; Espermatozoides; Hormonas esteroides sexuales; Progesterona; Testosterona; Estradiol; Semental ovino Suffolk.
Ano: 2009
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0301-50922009000200002

Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions
Provedor de dados: 2
Autores: Arsoy, Dilek; Sağmanlıgil, Vedat.
The objective of this study was to characterize the reproductive cycle both endocrinologically and behaviorally in ewes. Blood samples were analyzed by EIA for progesterone (P4), and RIA for estradiol in order to determine the breeding strategy of non-pregnant (n = 11) and pregnant (n = 9) White Karaman throughout the year in the Middle Anatolia (39.570N, 32.530W), Turkey. Estrous cycle lengths and estrous lengths were 18.36 ± 1.03 days and 35.16 ± 5.95 hours, respectively. The breeding season durations were 283 ± 63.36 days and 229.64 ± 63.74 days according to hormonal and behavioral data respectively (p £ 0.01). The highest and lowest data of estrous occurrence frequency was observed in October and June-July, respectively. P4 levels ranged from 0.01 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal production animal reproduction breeding season; Estradiol; Indigenous ewes; Postpartum estrous; Progesterone.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/39908

El organofosforado clorpirifos como disruptor estrogénico y factor de riesgo para el cáncer de mama
Provedor de dados: 40
Autores: Cocca,Claudia; Ventura,Clara; Nunez,Mariel; Randi,Andrea; Venturino,Andres.
El clorpirifos (CPF) es un insecticida de amplio espectro que se utiliza en Argentina y en otros países de Latinoamérica. Se emplea para el control de plagas en la producción de frutas, hortalizas, cereales y plantas ornamentales. El principal mecanismo de acción descripto para este insecticida es la inhibición de la acetilcolinesterasa. Sin embargo, reportes más recientes sugieren múltiples efectos del plaguicida independientes de la inhibición de esa enzima. El objetivo de este trabajo es transmitir a la comunidad los resultados de nuestras investigaciones obtenidos utilizando diferentes dosis de CPF en distintos modelos experimentales, tanto in vitro como in vivo. En relación a esto, hemos evidenciado una acción del CPF sobre el sistema redox celular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clorpirifos; Cáncer de mama; Estradiol; ERO.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-37432015000300005

Efeitos de hormônios esteroides de contraceptivos orais combinados sobre os parâmetros comportamentais de Betta splendens (Regan, 1909)
Provedor de dados: 45
Autores: Santos,B.D.; Silva,M.C.G.; Santos,T.P.; Silva,S.C.B.L.; Cadena,M.R.S.; Cadena,P.G.
Os hormônios esteroides presentes em várias gerações de contraceptivos orais combinados (COC) podem se apresentar como disruptores endócrinos, produzindo alterações no comportamento e na fisiologia de peixes. Diante disso, o objetivo deste trabalho foi avaliar os efeitos de hormônios esteroides presentes em COC sobre os parâmetros comportamentais de Betta splendens, um peixe ornamental usado na aquariofilia e bastante agressivo. Machos adultos foram observados pelo método ad libitum para confecção do etograma e divididos em cinco grupos, controle e expostos aos hormônios: 17β-estradiol (E2); levonorgestrel e etinilestradiol (LEA - segunda geração de COC); gestodeno e etinilestradiol (GEA - terceira geração de COC); e drospirenona e etinilestradiol (DEA -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Betta splendens; Estradiol; Etinilestradiol; Etograma; Comportamento agressivo.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000200387

Cloprostenol administration in the first week postpartum reduces expression of oxytocin receptors in the endometrium in Holstein-Zebu cows
Provedor de dados: 45
Autores: Camargos,A.; Wohlres-Viana,S.; Costa,I.F.; Camargo,L.S.; Ferreira,J.C.; Ramos,A.A.; Oba,E.
ABSTRACT The present study investigated the hormonal profile and expression of prostaglandin F2α (PGF2α), oxytocin and estrogen receptors in uterine tissues of postpartum cows treated with cloprostenol. Twenty Holstein-Zebu crossbred cows were treated with saline solution (treatment CONT) or cloprostenol (treatment CLO), both administered two and five days postpartum. Blood samples were collected on days two, seven, 14, 21 and 28 postpartum for progesterone, PGF2α metabolite (PGFM) and estradiol determination, and endometrial biopsy was performed in order to quantify the expression of oxytocin receptor (OXTR), prostaglandin F receptor (PTGFR) and estrogen receptor 1 (ERS1) genes. In the CLO treatment, expression of OXTR was reduced (P&lt;0.05) but no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PTGFR; ESR1; Progesterone; Estradiol; RT-PCR.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000400821

Cervical relaxation for non-surgical uterus access in Santa Inês ewes
Provedor de dados: 45
Autores: Leite,C.R.; Fonseca,J.F.; Fernandes,D.A.M.; Souza-Fabjan,J.M.G.; Ascoli,F.O.; Brandão,F.Z.
ABSTRACT The present study was composed by two experiments aiming to develop a cervical dilation technique for non-surgical access to Santa Inês ewe’s uterus. In Experiment 1, thirty ewes underwent four epidural treatments. The three experimental treatments used 2.0mg/kg ketamine. The group receiving this drug alone was denominated KG, whereas other group had ketamine associated with 0.1mg/kg morphine (KM) and KX a third group had ketamine associated with 0.05mg/kg xylazine (KX). Control treatment was 1mL/7.5kg saline solution epidurally (CON). Cervical dilation was evaluated in both experiments by attempting to pass a metal rod through the cervix. In Experiment 2, three different hormonal protocols for cervical dilation were tested in thirty ewes....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epidural ketamine; Estradiol; Misoprostol; Oxytocin; Sheep cervix.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000601671

Estradiol and progesterone fecal metabolites analysis in crab-eating-fox (Cerdocyoun thous)
Provedor de dados: 45
Autores: Paz,R.C.R.; Souza,N.P.; Furtado,P.V.; Brown,J.L.
ABSTRACT In this study, four crab-eating fox females (Cerdocyon thous) maintained at the Federal University of Mato Grosso Zoo, Cuiabá, Brazil, were investigated for 12 months, using feces measurement of estradiol and progesterone concentrations. Fecal collections were performed three times a week for hormone extraction. Two methods of analysis, Elisa (EIA) and Radioimmunoassay (RIA), were used in the measurement of progesterone (P4) and estradiol (E2) metabolites. The aim of this study was to compare and validate two different methods of hormone measurement for C. thous. There were no differences regarding the method used. The Radioimmunoassay technique proved to be more sensitive, however, both showed similar results.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radioimmunoassay; Elisa; Estradiol; Progesterone; Fecal.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000300636

A segment and epithelium specific messenger ribonucleic acid fragment up-regulated by estradiol in the rat oviduct
Provedor de dados: 48
Autores: RIOS,MARIANA; OJEDA,SUANY; VELASQUEZ,LUIS A; MAISEY,KEVIN; CROXATTO,HORACIO B.
Estradiol accelerates oviductal embryo transport in the rat through changes of genomic expression in oviductal cells. However, the genes involved are unknown. We used a differential display by reverse transcription-polymerase chain reaction to detect estradiol (E2)-dependent genes in the rat oviduct. Rats on day 2 of pregnancy were untreated or treated with 10 µg of E2 and the oviducts were extracted at 30, 180 and 360 min later and used to isolate RNA. Products of reverse transcriptase-PCR, made with pairs of arbitrary and oligo-deoxythymidine primers, were separated on denaturing polyacrylamide gels and candidate bands were excised and reamplified. Truly positive cDNA fragments determined by a single strand conformation polymorphism assay were cloned and...
Tipo: Journal article
Palavras-chave: Differential display; Estradiol; Gene; MRNA; Oviduct.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000100011

Genital Sensory Stimulation Shifts Estradiol Intraoviductal Signaling from Nongenomic to Genomic Pathways, Independently from Prolactin Surges
Provedor de dados: 48
Autores: PEÑARROJA-MATUTAN0,C; PARADA-BUSTAMANTE,A; ORIHUELA,P A; RÍOS,M; VELASQUEZ,LUIS A; CROXATTO,H B.
Estradiol (E2) accelerates oviductal egg transport through nongenomic pathways involving oviductal protein phosphorylation in non-mated rats, and through genomic pathways in mated rats. Here we investigated the ability of cervico-vaginal stimulation (CVS) to switch the mode of action of E2 in the absence of other male-associated components. Pro-estrous rats were subjected to CVS with a glass rod and 12 hours later were injected subcutaneously with E2 and intrabursally with the RNA synthesis inhibitor Actinomycin D or the protein phosphorylation inhibitor H-89. The number of eggs in the oviduct, assessed 24 h later, showed that Actinomycin D, but not H-89 blocked the E2-induced egg transport acceleration. This clearly indicates that CVS alone, without other...
Tipo: Journal article
Palavras-chave: Mating; Oviduct; Estradiol; Signaling pathways; Prolactin receptor; Egg transport; Rat.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200012

Does Cimicifuga racemosa have the effects like estrogen on the sublingual gland in ovariectomized rats?
Provedor de dados: 48
Autores: Da,Yun&amp;#8209;Meng; Niu,Kai&amp;#8209;Yu; Liu,Shu&amp;#8209;Ya; Wang,Ke; Wang,Wen&amp;#8209;Juan; Jia,Jing; Qin,Li&amp;#8209;Hua; Bai,Wen&amp;#8209;Pei.
Abstract  Background Cimicifuga racemosa is one of the herbs used for the treatment of climacteric syndrome, and it has been cited as an alternative therapy to estrogen. Apart from hectic fevers, dyspareunia and so on, dry mouth also increase significantly after menopause. It has not yet been reported whether C. racemosa has any impact on the sublingual gland, which may relate to dry mouth. In an attempt to determine this, we have compared the effects of estrogen and C. racemosa on the sublingual gland of ovariectomized rats.  Results  HE staining showed that the acinar cell area had contracted and that the intercellular spaces were broadened in the OVX (ovariectomized rats) group, while treatment with estradiol (E2) and iCR (isopropanolic extract of C....
Tipo: Journal article
Palavras-chave: Estradiol; Cimicifuga racemosa; Sublingual gland; Subcellular structure; Caspase-3.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100209

Testosterone therapy delays cardiomyocyte aging via an androgen receptor-independent pathway
Provedor de dados: 56
Autores: Zhang,L.; Wu,S.Z.; Ruan,Y.J.; Hong,L.; Xing,X.W.; Lai,W.Y.
The testicular feminized (Tfm) mouse carries a nonfunctional androgen receptor (AR) and reduced circulating testosterone levels. We used Tfm and castrated mice to determine whether testosterone modulates markers of aging in cardiomyocytes via its classic AR-dependent pathway or conversion to estradiol. Male littermates and Tfm mice were divided into 6 experimental groups. Castrated littermates (group 1) and sham-operated Tfm mice (group 2, N = 8 each) received testosterone. Sham-operated Tfm mice received testosterone in combination with the aromatase inhibitor anastrazole (group 3, N = 7). Castrated littermates (group 4) and sham-operated untreated Tfm mice (group 5) were used as controls (N = 8 and 7, respectively). An additional control group (group 6)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aging; Testosterone; Cardiomyocyte; Androgen receptor; Estradiol; Tfm mice.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011001100007

The modulatory effect of estradiol benzoate on superoxide dismutase activity in the developing rat brain
Provedor de dados: 56
Autores: Pejic,S.; Kasapovic,J.; Cvetkovic,D.; Pajovic,S.B.
The sensitivity of copper,zinc (CuZn)- and manganese (Mn)-superoxide dismutase (SOD) to exogenous estradiol benzoate (EB) was investigated in Wistar rats during postnatal brain development. Enzyme activities were measured in samples prepared from brains of rats of both sexes and various ages between 0 and 75 days, treated sc with 0.5 µg EB/100 g body weight in 0.1 ml olive oil/100 g body weight, 48 and 24 h before sacrifice. In females, EB treatment stimulated MnSOD activity on days 0 (66.1%), 8 (72.7%) and 15 (81.7%). In males, the stimulatory effect of EB on MnSOD activity on day 0 (113.6%) disappeared on day 8 and on days 15 and 45 it became inhibitory (40.3 and 30.5%, respectively). EB had no effect on the other age groups. The stimulatory effect of EB...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brain; Brain development; Estradiol; Superoxide dismutase.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000500004

Sex hormone modulation of serotonin-induced coronary vasodilation in isolated heart
Provedor de dados: 56
Autores: Moysés,M.R.; Barker,L.A.; Cabral,A.M.
The present study was designed to evaluate the differences in the coronary vasodilator actions of serotonin (5-HT) in isolated heart obtained from naive or castrated male and female rats that were treated with either estrogen or testosterone. Hearts from 12 groups of rats were used: male and female naive animals, castrated, castrated and treated with 17ß-estradiol (0.5 µg kg-1 day-1) for 7 or 30 days, and castrated and treated with testosterone (0.5 mg kg-1 day-1) for 7 or 30 days. After treatment, the vascular reactivity of the coronary bed was evaluated. Baseline coronary perfusion pressure (CPP) was determined and dose-response curves to 5-HT were generated. Baseline CPP differed between male (70 ± 6 mmHg, N = 10) and female (115 ± 6 mmHg, N = 12) naive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coronary circulation; Endothelial function; Estradiol; Serotonin; Smooth muscle.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000700014

Effects of estradiol benzoate on 5'-iodothyronine deiodinase activities in female rat anterior pituitary gland, liver and thyroid gland
Provedor de dados: 56
Autores: Lisbôa,P.C.; Curty,F.H.; Moreira,R.M.; Pazos-Moura,C.C.
There is little information on the possible effects of estrogen on the activity of 5'-deiodinase (5'-ID), an enzyme responsible for the generation of T3, the biologically active thyroid hormone. In the present study, anterior pituitary sonicates or hepatic and thyroid microsomes from ovariectomized (OVX) rats treated or not with estradiol benzoate (EB, 0.7 or 14 µg/100 g body weight, sc, for 10 days) were assayed for type I 5'-ID (5'-ID-I) and type II 5'-ID (5'-ID-II, only in pituitary) activities. The 5'-ID activity was evaluated by the release of 125I from deiodinated 125I rT3, using specific assay conditions for type I or type II. Serum TSH and free T3 and free T4 were measured by radioimmunoassay. OVX alone induced a reduction in pituitary 5'-ID-I...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5'-iodothyronine deiodinase; Ovariectomy; Estradiol; Triiodothyronine; Thyroxine; Thyrotropin.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001200016

Estradiol decreases iodide uptake by rat thyroid follicular FRTL-5 cells
Provedor de dados: 56
Autores: Furlanetto,T.W.; Nunes Jr.,R.B.; Sopelsa,A.M.I.; Maciel,R.M.B.
Estradiol has well-known indirect effects on the thyroid. A direct effect of estradiol on thyroid follicular cells, increasing cell growth and reducing the expression of the sodium-iodide symporter gene, has been recently reported. The aim of the present investigation was to study the effect of estradiol on iodide uptake by thyroid follicular cells, using FRTL-5 cells as a model. Estradiol decreased basal iodide uptake by FRTL-5 cells from control levels of 2.490 ± 0.370 to 2.085 ± 0.364 pmol I-/µg DNA at 1 ng/ml (P&lt;0.02), to 1.970 ± 0.302 pmol I-/µg DNA at 10 ng/ml (P&lt;0.003), and to 2.038 ± 0.389 pmol I-/µg DNA at 100 ng/ml (P&lt;0.02). In addition, 4 ng/ml estradiol decreased iodide uptake induced by 0.02 mIU/ml thyrotropin from 8.678 ± 0.408 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iodide uptake; Estradiol; Thyroid; Follicular cells.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000200015

CCR3 antagonist impairs estradiol-induced eosinophil migration to the uterus in ovariectomized mice
Provedor de dados: 56
Autores: Araújo,J.M.D.; Silva,L.A.S.; Felix,F.B.; Camargo,E.A.; Grespan,R.
Eosinophils are abundant in the reproductive tract, contributing to the remodeling and successful implantation of the embryo. However, the mechanisms by which eosinophils migrate into the uterus and their relationship to edema are still not entirely clear, since there are a variety of chemotactic factors that can cause migration of these cells. Therefore, to evaluate the role of CCR3 in eosinophil migration, ovariectomized C57BL/6 mice were treated with CCR3 antagonist SB 328437 and 17β-estradiol. The hypothesis that the CCR3 receptor plays an important role in eosinophil migration to the mouse uterus was confirmed, because we observed reduction in eosinophil peroxidase activity in these antagonist-treated uteruses. The antagonist also influenced uterine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estradiol; Chemokine receptor; Immunology; Menopause; Uterus.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2020000100603

Estradiol-induced hypophagia is associated with the differential mRNA expression of hypothalamic neuropeptides
Provedor de dados: 56
Autores: Silva,L.E.C.M.; Castro,M.; Amaral,F.C.; Antunes-Rodrigues,J.; Elias,L.L.K.
Estradiol participates in the control of energy homeostasis, as demonstrated by an increase in food intake and in body weight gain after ovariectomy in rats. In the present study, female Wistar rats (200-230 g, N = 5-15 per group), with free access to chow, were individually housed in metabolic cages. We investigated food intake, body weight, plasma leptin levels, measured by specific radioimmunoassay, and the hypothalamic mRNA expression of orexigenic and anorexigenic neuropeptides, determined by real-time PCR, in ovariectomized rats with (OVX+E) and without (OVX) estradiol cypionate treatment (10 µg/kg body weight, sc, for 8 days). Hormonal and mRNA expression were determined at pre-feeding and 4 h after food intake. OVX+E rats showed lower food intake,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estradiol; Leptin; Orexigenic and anorexigenic neuropeptides; Hypothalamus.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000800009

Behavioral effects of endogenous or exogenous estradiol and progesterone on cocaine sensitization in female rats
Provedor de dados: 56
Autores: Souza,M.F.; Couto-Pereira,N.S.; Freese,L.; Costa,P.A.; Caletti,G.; Bisognin,K.M.; Nin,M.S.; Gomez,R.; Barros,H.M.T.
Cocaine sensitization is a marker for some facets of addiction, is greater in female rats, and may be influenced by their sex hormones. We compared the modulatory effects of endogenous or exogenous estradiol and progesterone on cocaine-induced behavioral sensitization in 106 female rats. Ovariectomized female rats received progesterone (0.5 mg/mL), estradiol (0.05 mg/mL), progesterone plus estradiol, or the oil vehicle. Sham-operated control females received oil. Control and acute subgroups received injections of saline, while the repeated group received cocaine (15 mg/kg, ip) for 8 days. After 10 days, the acute and repeated groups received a challenge dose of cocaine, after which locomotion and stereotypy were monitored. The estrous cycle phase was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cocaine; Locomotor activity; Female rats; Estradiol; Progesterone; Stereotypic activity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000600505

Effect of estradiol and bisphenol A on human hepatoblastoma cell viability and telomerase activity
Provedor de dados: 56
Autores: Xu,B.L.; Zhao,Q.Z.; Gao,X.Y.; Hou,G.J.
Sex hormones from environmental and physiological sources might play a major role in the pathogenesis of hepatoblastoma in children. This study investigated the effects of estradiol and bisphenol A on the proliferation and telomerase activity of human hepatoblastoma HepG2 cells. The cells were divided into 6 treatment groups: control, bisphenol A, estradiol, anti-estrogen ICI 182,780 (hereinafter ICI), bisphenol A+ICI, and estradiol+ICI. Cell proliferation was measured based on average absorbance using the Cell Counting-8 assay. The cell cycle distribution and apoptotic index were determined by flow cytometry. Telomerase activity was detected by polymerase chain reaction and a telomeric repeat amplification protocol assay. A higher cell density was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estradiol; Bisphenol A; HepG2; Telomerase activity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015001101004

Concentrações séricas de progesterona, 17 b-estradiol e cortisol durante o final do próestro, estro e diestro gestacional em cadelas
Provedor de dados: 65
Autores: Benetti,Ana Helena; Toniollo,Gilson Hélio; Oliveira,João Ademir de.
Neste estudo, foram utilizadas 7 cadelas sem raça definida, adultas e hígidas, copuladas com macho hígido, após exame andrológico, para acompanhamento das variações hormonais de progesterona, 17b-estradiol e cortisol a partir do final do próestro, durante o estro e diestro gestacional em fêmeas da espécie canina. As avaliações séricas do cortisol foram iniciadas no período de estro. A citologia vaginal esfoliativa foi utilizada como parâmetro auxiliar para a determinação das fases do ciclo estral, mais especificamente para análise do melhor momento para cópula, através da presença das células superficiais queratinizadas visibilizadas nas lâminas. Os resultados obtidos mostraram concentrações médias de progesterona elevando-se discretamente no final do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadelas; Gestação; Progesterona; Estradiol; Cortisol.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000200021

Sistemas de inseminação artificial em dois dias com observação de estro ou em tempo fixo para vacas de corte amamentando
Provedor de dados: 65
Autores: Siqueira,Lucas Carvalho; Oliveira,João Francisco Coelho de; Loguércio,Rosane da Silveira; Löf,Henrique Kurtz; Gonçalves,Paulo Bayard Dias.
O objetivo do presente experimento foi investigar se a realização exclusiva da inseminação artificial em tempo fixo (IATF), empregando como indutor da ovulação o benzoato de estradiol (BE), proporciona taxas de prenhez semelhantes a uma associação de IA convencional e IATF com GnRH, em vacas de corte no pós-parto. Duzentos e cinqüenta vacas amamentado receberam um pessário vaginal contendo 250mg de acetato de medroxi-progesterona (MAP) e uma injeção intramuscular (IM) de 5mg de BE no dia 0. O pessário vaginal permaneceu por sete dias. No dia 6, foram aplicadas 400UI de gonadotrofina coriônica eqüina por via IM e 5mg de análogo de prostaglandina na submucosa vulvar, realizando nesse momento o desmame por 96h. Após a retirada dos pessários (dia 7), as vacas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pós-parto; IATF; Indução de estro; GnRH; Estradiol.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000200019

Efeito do estradiol, dietas e duração do período seco sobre o consumo de matéria seca de vacas holandesas
Provedor de dados: 64
Autores: Teixeira,Lucia De Fátima Andrade Correia; Perez,Juan Ramon Olalquiaga; Ferreira,Daniel Furtado; Souza,José Camisão de; Muniz,Joel Augusto; Head,H. Herbert.
Foram avaliados os efeitos de dietas aniônicas (DA) e catiônicas (DC), associadas ou não ao uso de estradiol em dois períodos secos: período seco curto (30 dias) (PSC) e período seco regular (60 dias) (PSR) sobre o consumo de matéria seca (MS) de 40 vacas Holandesas, nos períodos pré-parto (PREP) e pós-parto (PP), distribuídas aleatoriamente em esquema fatorial 2x2+2. As dietas foram fornecidas por 21 dias no período pré-parto, após o qual, as vacas passaram a receber uma dieta de lactação. As DA não tiveram efeito sobre o consumo de MS no PREP; entretanto, resultaram em maior consumo quando comparadas à DC no pós-parto. Os contrastes entre tratamentos mostraram que DA fornecidas no PREP produziram aumento no consumo PP, PSR e no PSC associadas ao...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dietas aniônicas; Estradiol; Período seco curto.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000400024