Consulta: subjectFacets:"Schistosoma mansoni"
Registros recuperados: 27
Data/hora: 01/06/2024 02:10:48

Aspectos ecológicos e levantamento malacológico para identificação de áreas de risco para transmissão da esquistossomose mansoni no litoral norte de Pernambuco, Brasil
Provedor de dados: 76
Autores: Souza,Marco A. A.; Barbosa,Verônica S.; Albuquerque,Jones O.; Bocanegra,Silvana; Souza-Santos,Reinaldo; Paredes,Helen; Barbosa,Constança S.
Realizou-se levantamento malacológico na praia de Carne de Vaca, município de Goiana, litoral norte de Pernambuco, entre novembro de 2006 e outubro de 2007, com o objetivo de conhecer a fauna malacológica dessa localidade e verificar as condições naturais, pouco ou bastante alteradas das áreas de estudo através da aplicação de um protocolo de avaliação de diversidade de hábitats. Foram coletados 5.912 moluscos, representados por sete espécies e quatro famílias, dos quais, 5.209 exemplares de Biomphalaria glabrata (Say, 1818), 113 de Drepanotrema lucidum (Pfeiffer, 1839), 55 de Drepanotrema cimex (Moricand, 1837), 13 de Drepanotrema anatinum (Pfeiffer, 1839), 222 de Melanoides tuberculatus (Muller, 1774), 263 de Pomacea sp. e 37 de Physa marmorata Guilding,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gastropoda; Schistosoma mansoni; Praia de Carne de Vaca; Ambiente de água doce.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000100003

A simple ATAC-seq protocol for population epigenetics
Provedor de dados: 5
Autores: De Carvalho Augusto, Ronaldo; Rey, Oliver; Cosseau, Céline; Chaparro, Cristian; Vidal-dupiol, Jeremie; Allienne, Jean-françois; Duval, David; Pinaud, Silvain; Tönges, Sina; Andriantsoa, Ranja; Luquet, Emilien; Aubret, Fabien; Dia Sow, Mamadou; David, Patrice; Thomson, Vicki; Joly, Dominique; Gomes Lima, Mariana; Federico, Déborah; Danchin, Etienne; Minoda, Aki; Grunau, Christoph.
We describe here a protocol for the generation of sequence-ready libraries for population epigenomics studies, and the analysis of alignment results. We show that the protocol can be used to monitor chromatin structure changes in populations when exposed to environmental cues. The protocol is a streamlined version of the Assay for transposase accessible chromatin with high-throughput sequencing (ATAC-seq) that provides a positive display of accessible, presumably euchromatic regions. The protocol is straightforward and can be used with small individuals such as daphnia and schistosome worms, and probably many other biological samples of comparable size (~10,000 cells), and it requires little molecular biology handling expertise.
Tipo: Text
Palavras-chave: Epigenetics; Epigenomics; ATAC-seq; Daphnia pulex; Schistosoma mansoni.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00681/79353/81859.pdf

The anti-fecundity effect of 5-azacytidine (5-AzaC) on Schistosoma mansoni is linked to dis-regulated transcription, translation and stem cell activities
Provedor de dados: 5
Autores: Geyer, Kathrin K.; Munshi, Sabrina E.; Vickers, Martin; Squance, Michael; Wilkinson, Toby J.; Berrar, Daniel; Chaparro, Cristian; Swain, Martin T.; Hoffmann, Karl F.
Uncontrolled host immunological reactions directed against tissue-trapped eggs precipitate a potentially lethal, pathological cascade responsible for schistosomiasis. Blocking schistosome egg production, therefore, presents a strategy for simultaneously reducing immunopathology as well as limiting disease transmission in endemic or emerging areas. We recently demonstrated that the ribonucleoside analogue 5-azacytidine (5-AzaC) inhibited Schistosoma mansoni oviposition, egg maturation and ovarian development. While these anti-fecundity effects were associated with a loss of DNA methylation, other molecular processes affected by 5-AzaC were not examined at the time. By comparing the transcriptomes of 5-AzaC-treated females to controls, we provide evidence...
Tipo: Text
Palavras-chave: Schistosoma mansoni; Epigenetics; 5-Azacytidine; Fecundity; RNA-Seq; Protein synthesis; Stem cells.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00615/72703/71747.pdf

Dosage Compensation throughout the Schistosoma mansoni Lifecycle: Specific Chromatin Landscape of the Z Chromosome
Provedor de dados: 5
Autores: Picard, Marion A. L.; Vicoso, Beatriz; Roquis, David; Bulla, Ingo; Augusto, Ronaldo C.; Arancibia, Nathalie; Grunau, Christoph; Boissier, Jerome; Cosseau, Celine.
Differentiated sex chromosomes are accompanied by a difference in gene dose between X/Z-specific and autosomal genes. At the transcriptomic level, these sex-linked genes can lead to expression imbalance, or gene dosage can be compensated by epigenetic mechanisms and results into expression level equalization. Schistosoma mansoni has been previously described as a ZW species (i.e., female heterogamety, in opposition to XY male heterogametic species) with a partial dosage compensation, but underlying mechanisms are still unexplored. Here, we combine transcriptomic (RNA-Seq) and epigenetic data (ChIP-Seq against H3K4me3, H3K27me3, and H4K20me1 histone marks) in free larval cercariae and intravertebrate parasitic stages. For the first time, we describe...
Tipo: Text
Palavras-chave: Dosage compensation; Chromatin landscape; Histone modifications; Female heterogamety; Schistosoma mansoni.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00514/62580/66929.pdf

Advances in gastropod immunity from the study of the interaction between the snail Biomphalaria glabrata and its parasites: A review of research progress over the last decade
Provedor de dados: 5
Autores: Coustau, C.; Gourbal, B.; Duval, D.; Yoshino, T. P.; Adema, C. M.; Mitta, Guillaume.
This review summarizes the research progress made over the past decade in the field of gastropod immunity resulting from investigations of the interaction between the snail Biomphalaria glabrata and its trematode parasites. A combination of integrated approaches, including cellular, genetic and comparative molecular and proteomic approaches have revealed novel molecular components involved in mediating Biomphalaria immune responses that provide insights into the nature of host-parasite compatibility and the mechanisms involved in parasite recognition and killing. The current overview emphasizes that the interaction between B. glabrata and its trematode parasites involves a complex molecular crosstalk between numerous antigens, immune receptors, effectors...
Tipo: Text
Palavras-chave: Biomphalaria glabrata; Schistosoma mansoni; Echinostoma caproni; Immunity; Compatibility.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00276/38718/38622.pdf

Prevalence and Risk Factors for Schistosomiasis among Schoolchildren in two Settings of Côte d’Ivoire
Provedor de dados: 5
Autores: Angora, Etienne K.; Boissier, Jérôme; Menan, Hervé; Rey, Olivier; Tuo, Karim; Touré, Andre O.; Coulibaly, Jean T.; Méité, Aboulaye; Raso, Giovanna; N’goran, Eliézer K.; Utzinger, Jürg; Balmer, Oliver.
Schistosomiasis is a parasitic disease affecting more than 250 million people, primarily in sub-Saharan Africa. In Côte d’Ivoire both Schistosoma haematobium (causing urogenital schistosomiasis) and Schistosoma mansoni (causing intestinal schistosomiasis) co-exist. This study aimed to determine the prevalence of S. haematobium and S. mansoni and to identify risk factors among schoolchildren in the western and southern parts of Côte d’Ivoire. From January to April 2018, a cross-sectional study was carried out including 1187 schoolchildren aged 5–14 years. Urine samples were examined by a filtration method to identify and count S. haematobium eggs, while stool samples were subjected to duplicate Kato-Katz thick smears to quantify eggs of S. mansoni and...
Tipo: Text
Palavras-chave: Côte d’Ivoire; Prevalence; Risk factors; Schistosoma haematobium; Schistosoma mansoni; Schistosomiasis.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00508/61953/66043.pdf

Molluscicidal and parasiticidal activities of Eryngium triquetrum essential oil on Schistosoma mansoni and its intermediate snail host Biomphalaria glabrata, a double impact
Provedor de dados: 5
Autores: De Carvalho Augusto, Ronaldo; Merad, Nadjiya; Rognon, Anne; Gourbal, Benjamin; Bertrand, Cédric; Djabou, Nassim; Duval, David.
Background Freshwater snails are the intermediate hosts of a large variety of trematode flukes such as Schistosoma mansoni responsible for one of the most important parasitic diseases caused by helminths, affecting 67 million people worldwide. Recently, the WHO Global Vector Control Response 2017–2030 (GVCR) programme reinforced its message for safer molluscicides as part of required strategies to strengthen vector control worldwide. Here, we present the essential oil from Eryngium triquetrum as a powerful product with molluscicide and parasiticide effect against S. mansoni and the snail intermediate host Biomphalaria glabrata. Methods In the present study, we describe using several experimental approaches, the chemical composition of E. triquetrum...
Tipo: Text
Palavras-chave: Biomphalaria glabrata; Eryngium triquetrum; Molluscicide; Oil; Parasiticide; Schistosoma mansoni.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76382/77391.pdf

Epigenetic origin of adaptive phenotypic variants in the human blood fluke Schistosoma mansoni
Provedor de dados: 5
Autores: Fneich, Sara; Theron, Andre; Cosseau, Celine; Rognon, Anne; Aliaga, Benoit; Buard, Jerome; Duval, David; Arancibia, Nathalie; Boissier, Jerome; Roquis, David; Mitta, Guillaume; Grunau, Christoph.
Background: Adaptive evolution is not possible without the generation of phenotypic variants. The origin of these variations has been a central topic in evolutionary biology. Up to now, it was commonly accepted that standing genetic variation is the only cause of phenotypic variants. However, epigenetic information is emerging as a complementary source of heritable phenotypic variation that contributes to evolution. The relative importance of genetics and epigenetics in generating heritable phenotypic variation is nevertheless a matter of debate. Results: We used a host-parasite system to address this question. The human blood fluke Schistosoma mansoni can adapt rapidly to new intermediate snail hosts. The interaction between parasite and mollusk is...
Tipo: Text
Palavras-chave: Epigenetics; Adaptive evolution; Compatibility polymorphism; Schistosoma mansoni.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00615/72708/71730.pdf

Genetic diversity, multiplicity of infection and population structure of Schistosoma mansoni isolates from human hosts in Ethiopia
Provedor de dados: 5
Autores: Aemero, Mulugeta; Boissier, Jerome; Climent, Deborah; Mone, Helene; Mouahid, Gabriel; Berhe, Nega; Erko, Berhanu.
Background: Human intestinal schistosomiasis caused by Schistosoma mansoni and urinary schistosomiasis caused by Schistosoma haematobium are endemic in Ethiopia. Although schistosomes look morphologically uniform, there is variation in infectivity, egg productivity and virulence due to variation in their genetic make. Knowing the genetic diversity and population structure of S. mansoni isolates will enable to understand and consider the possible variability in terms of infectivity, egg productivity and virulence. Methods: Between 2010 and 2011, genetic diversity and population structure of Schistosoma mansoni isolates from four endemic areas of Ethiopia was assessed using previously published 11 polymorphic microsatellite loci. Miracidia were hatched from...
Tipo: Text
Palavras-chave: Schistosoma mansoni; Microsatellite; Genetic diversity; Population structure; Ethiopia.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00302/41369/71868.pdf

Carbohydrates Detection in the Hepatic Egg - Granuloma System Using Lectin Histochemistry
Provedor de dados: 77
Autores: Ribeiro Melo-Júnior,Mario; Bezerra Cavalcanti,Carmelita de Lima; Teles de Pontes-Filho,Nicodemos; Carvalho Jr,Luiz Bezerra de; Carneiro Beltrão,Eduardo Isidoro.
This study aims to evalúate the egg-granuloma system in hepatic tissues using lectin histochemistry in experimental Schistosomiasis. Eight Swiss mice were infected with a local strain of Schistosoma mansoni, being submitted forty days later to a perfusión after which slices of liver (4|J.m) were prepared. The tissue samples were incubated with the following peroxidase conjugated lectins: Peanut agglutinin (PNA), Wheat Germ agglutinin (WGA), and Concanavalin A (Con A). All lectins recognized the glycoconjugates in the adult worm tegument. In the hepatic tissue, WGA presented the highest staining followed by PNA and Con A. The PNA presented the most intense staining of the egg-granuloma system while WGA stained the hepatic sinusoid cells and Con A bound...
Tipo: Journal article
Palavras-chave: Lectins; Egg-granuloma system; Liver; Schistosoma mansoni.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400030

Immunological studies and in vitro schistosomicide action of new imidazolidine derivatives
Provedor de dados: 80
Autores: JKAL,Neves; S,Sarinho; CML,de Melo; VRA,Pereira; MCA,de Lima; IR,Pitta; MCPA,Albuquerque; SL,Galdino.
Schistosomiasis is a major public health problem with 207 million people infected and more than 779 million at risk. The drug of choice for treating schistosomiasis is praziquantel (PZQ); however, it is inefficient against immature forms of schistosomes. The aim of this study was to test new imidazolidine derivatives LPSF/PT09 and LPSF/PT10 against adult Schistosoma mansoni worms. IC50, cytotoxicity, immune response and cell viability assays were also available for these imidazolidines. Different concentrations of imidazolidine, from 32 to 320 ¼M, promoted motor abnormalities in breeding and unpaired worms, and death in 24 hours at higher concentrations. Although LPSF/PT09 and LPSF/PT10 did not affect IFN-³ and IL-10 production, they induced nitric oxide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; In vitro; Imidazolidines.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992011000300007

Expression of schistosomal cathepsin l1 in Escherichia coli and evaluation of its protective capacity in an animal challenge
Provedor de dados: 80
Autores: Miyasato,PA; Ramos,CRR; Abreu,PAE; Dias,WO; Nascimento,C; Ho,PL; Kawano,T.
Schistosomes utilize proteinases to accomplish several activities such as tissue penetration, tissue digestion and evasion of host immune responses. Cathepsin L is a cysteine proteinase of the papain superfamily detected in their gut lumen which indicates that this enzyme contributes to the proteolysis of ingested hemoglobin. Due to the roles played in the schistosome biology, proteolytic enzymes are considered potential targets for developing and guiding antischistosomal therapies. In the present work, the cathepsin L1 cDNA coding of Schistosoma mansoni was cloned into the pAE vector that provides high-level expression of heterologous proteins in Escherichia coli. The recombinant protein was expressed as inclusion bodies, purified under denaturing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Cysteine proteinase; Cathepsin L1; Vaccine; Immunogenicity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992009000200011

Migration of Schistosoma mansoni sambon (Trematoda, Schistosomatidae) from skin to lungs in immunized NZ rabbits (Lagomorpha, Leporidae) by autoradiographic analysis
Provedor de dados: 104
Autores: Pinto,R. Magalhães; Noronha,Dely; Almeida,Marília S. S; Katz,Naftale; Tendler,Miriam.
Skin to lung migration of Schistosoma mansoni Sambon, 1907 - (75 Se) - selenomethionine-labeled cercariae was tracked by tissue autoradiography on days 1, 4, 6, 8 after challenge, in rabbits immunized with a S. mansoni derived saline extract. Either in vaccinated animals or in those of the control unprimed group, the peak of skin schistosomula occurs 24hs after infection. Comparison between peaks of lungs migrating larvae showed that, in control animals, the increase of worm burden in this site, is detected on the 6th day post-infection, differing from immunized rabbits, in which this peak occurs on day 4, when skin and lungs counts are still equivalent, decreasing gradually, showing a different pattern of the S. mansoni migration and suggesting that main...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Migration; Autoradiography; Immunization; Rabbits.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751994000400006

Characterization of the cGMP-dependent protein kinase SmcGK1 of Schistosoma mansoni
Provedor de dados: 42
Autores: Leutner,Silke; Beckmann,Svenja; Grevelding,Christoph G.
Schistosomes are trematode parasites and of worldwide medical importance for humans and animals. Growth and development of these parasites require a specific host environment, but also permanent communication processes between the two genders. Accumulating molecular evidence indicates that the responsible interactions are mediated by signal transduction processes. Conserved signaling molecules were identified, and first approaches made for their characterization. However, no representative of the conserved family of cGMP-dependent protein kinases (cGKs) has been described in this parasite yet. Within the Schistosoma mansoni genome data-set we identified cGK homologs, of which one was investigated in more detail in this study. We present the cloning of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Signal transduction; CGMP-dependent protein kinases (cGKs); Serine/threonine (S/T) kinases; Gonad development.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200023

Schistosoma mansoni polo-like kinases and their function in control of mitosis and parasite reproduction
Provedor de dados: 42
Autores: Dissous,Colette; Grevelding,Christoph G; Long,Thavy.
Polo-like kinases are important regulators of cell cycle progression and mitosis. They constitute a family of conserved serine/threonine kinases which are highly related in their catalytic domains and contain polo boxes involved in protein-protein interactions and subcellular localization. In mammals, five Plks (Plk 1-5) encompass diverse roles in centrosome dynamics, spindle formation, intra S-phase and G2/M checkpoints and DNA damage response. Plk1 is a key positive regulator of mitosis and is overexpressed in various types of cancers. Plk4 is a divergent member of the Plk family, with essential functions in centriole duplication. Homozygous disruption of Plk1 or Plk4 in mice is lethal in embryos. Two Plk members SmPlk1 and SmSak, homologous to Plk1 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell cycle; Polo-like kinases; Reproduction; Schistosoma mansoni.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200022

Non-coding RNAs in schistosomes: an unexplored world
Provedor de dados: 42
Autores: Oliveira,Katia C; Carvalho,Mariana L. P; Maracaja-Coutinho,Vinicius; Kitajima,João P; Verjovski-Almeida,Sergio.
Non-coding RNAs (ncRNAs) were recently given much higher attention due to technical advances in sequencing which expanded the characterization of transcriptomes in different organisms. ncRNAs have different lengths (22 nt to &gt;1, 000 nt) and mechanisms of action that essentially comprise a sophisticated gene expression regulation network. Recent publication of schistosome genomes and transcriptomes has increased the description and characterization of a large number of parasite genes. Here we review the number of predicted genes and the coverage of genomic bases in face of the public ESTs dataset available, including a critical appraisal of the evidence and characterization of ncRNAs in schistosomes. We show expression data for ncRNAs in Schistosoma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Non-coding RNAs; Gene expression profile; Genome; Transcriptome.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200026

Apoptose na modulação da resposta inflamatória aos ovos do Schistosoma mansoni
Provedor de dados: 45
Autores: Tristão,A.R.; Melo,A.L.; Vasconcelos,A.C.; Grossi,F.M.
Foram estudadas 42 amostras de fígado de camundongos inoculados com cercárias do Schistosoma mansoni, obtidas 40, 60, 80 e 120 dias após a infecção e processadas rotineiramente. As lâminas obtidas foram coradas pela HE para análise qualitativa e morfométrica do número e área dos granulomas e pelo MGP para quantificação de células apoptóticas. Os animais com 40 dias de inoculação possuíam menos granulomas/lâmina (&lt;img src="http:/img/fbpe/abmvz/v52n6/a06img01.gif" alt="a06img01.gif (532 bytes)" align="absmiddle" &gt; ou = 11,78±4,01), com áreas pequenas (&lt;img src="http:/img/fbpe/abmvz/v52n6/a06img01.gif" alt="a06img01.gif (532 bytes)" align="absmiddle" &gt; ou = 52.713,88±5.244,34&lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;m²) e as menores médias de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schistosoma mansoni; Apoptose; Morte celular programada; Modulação da inflamação; Granuloma.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352000000600006

Role of berberine in ameliorating Schistosoma mansoni-induced hepatic injury in mice
Provedor de dados: 48
Autores: Dkhi,Mohamed A.
BACKGROUND: Schistosomiasis is caused by helminth parasites of the genus Schistosoma. Berberine chloride (BER), an isoquinoline alkaloid, has been used in vivo for its antiparasitic, antioxidant and hepatoprotective properties. In this study, the protective effect of BER and praziquantel has been compared for the extent of schistosomiasis-induced oxidative stress in hepatic tissue of mice. RESULTS: S. mansoni was able to induce inflammation and injury to the liver, evidenced (i) by an increase in inflammatory cellular infiltrations, dilated sinusoids and vacuolated hepatocytes, (ii) by decreased levels of alanine and aspartate aminotransferases and increased levels of alkaline phosphatase, &amp;#947;-glutamyl transferase in the liver homogenate, (iii) by...
Tipo: Journal article
Palavras-chave: Schistosoma mansoni; Berberine; Liver; Mice.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100008

Schistosomal peritonitis secondary to perforated appendicitis
Provedor de dados: 55
Autores: Mazigo,Humphrey D; Giiti,Geofrey C; Zinga,Maria; Heukelbach,Jorg; Rambau,Peter.
In Tanzania, Schistosoma mansoni is endemic and causes intestinal schistosomiasis which affects various internal organs. However, worldwide there have been very few reports of cases of peritonitis due to schistosomal appendicitis. Here we report a rare case of schistosomal appendicitis with peritonitis in a 33 year-old male patient who recovered quickly after surgery
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Appendicitis; Peritonitis; Schistosoma mansoni; Tanzania.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702010000600013

Schistosomal liver fibrosis and hepatocellular carcinoma - case series of patients submitted to liver transplantation
Provedor de dados: 55
Autores: Filgueira,Norma Arteiro; Saraiva,Camilla Maria de Alencar; Jucá,Norma Thomé; Bezerra,Matheus Filgueira; Lacerda,Claudio Moura.
ABSTRACT Schistosomiasis affects approximately 207 million people in 76 countries. The association between hepatocellular carcinoma and Schistosoma mansoni infection has been investigated. Studies using animal models suggest that the parasite may accelerate the oncogenic process when combined with other factors, such as hepatitis C virus infection or exposure to a carcinogen. Herein, we report a case series of six hepatocellular carcinoma patients from Northeast Brazil, with negative serology for both hepatitis B and C virus, submitted to liver transplantation, whose explant showed evidence of schistosomal liver fibrosis. Since all patients enrolled in this study were submitted to liver transplantation, we were able to access the whole explanted liver and...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Schistosoma mansoni; Hepatocellular carcinoma; Liver transplantation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702018000400352

Evaluation of the antischistosomal activity of sulfated α-D-glucan from the lichen Ramalina celastri free and encapsulated into liposomes
Provedor de dados: 56
Autores: Araújo,R.V.S.; Melo-Júnior,M.R.; Beltrão,E.I.C.; Mello,L.A.; Iacomini,M.; Carneiro-Leão,A.M.A.; Carvalho Jr,L.B.; Santos-Magalhães,N.S.
The antischistosomal activity of the sulfated polysaccharide α-D-glucan (Glu.SO4) extracted from Ramalina celastri was evaluated after encapsulation into liposomes (Glu.SO4-LIPO) in Schistosoma mansoni-infected mice. The effect of treatment with Glu.SO4 and Glu.SO4-LIPO (10 mg/kg) on egg elimination, worm burden and hepatic granuloma formation was assessed using female albino Swiss mice, 35-40 days of age, weighing 25 ± 2 g, infected with 150 cercariae/animal (Biomphalaria glabrata, BH strain). Four groups (N = 10) were studied, two controls (empty liposomes and NaCl) and two treated groups (Glu.SO4-LIPO and Glu.SO4) using a single dose. Parasitological analysis revealed that Glu.SO4-LIPO was as efficient as Glu.SO4 in reducing egg elimination and worm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polysaccharide; Α-D-glucan; Ramalina celastri; Liposomes; Schistosoma mansoni; Lectin histochemistry.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000400007

Effect of praziquantel administration on hepatic stereology of mice infected with Schistosoma mansoni and fed a low-protein diet
Provedor de dados: 56
Autores: Barros,L.A.; Costa-Silva,M.; Biolchini,C.L.; Neves,R.H.; Machado-Silva,J.R.
A study was undertaken to investigate the effect of administering praziquantel (PZQ), focusing on the liver stereological findings of malnourished mice infected with Schistosoma mansoni. Thirty female Swiss Webster mice (age: 21 days; weight: 8-14 g) were fed either a low-protein diet (8%) or standard chow (22% protein) for 15 days. Five mice in each group were infected with 50 cercariae each of the BH strain (Brazil). PZQ therapy (80 mg/kg body weight, per day) was started on the 50th day of infection and consisted of daily administration for 5 days. Volume density (hepatocytes, sinusoids and hepatic fibrosis) was determined by stereology using a light microscope. Body weight gain and total serum albumin levels were always lower in undernourished mice....
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Schistosoma mansoni; Low-protein diet; Stereology; Praziquantel.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009000900007

Activity of liver microsomal enzymes during the chronic phase of murine schistosomiasis
Provedor de dados: 56
Autores: Conte,F.P.; Fidalgo-Neto,A.A.; Manhães-Rocha,D.A.; Paumgartten,F.J.R.; De-Oliveira,A.C.A.X.
The effects of schistosomiasis on microsomal enzymes were studied on post-infection day 90 when accumulated damage and fibrosis are most intense but granulomatous reaction around the eggs harbored in the liver is smaller than during the earlier phases. Swiss Webster (SW) and DBA/2 mice of either sex (N = 12 per sex per group) were infected with 100 Schistosoma mansoni cercariae on postnatal day 10 and killed on post-infection day 90. Cytochrome P-450 (CYP) concentration and alkoxyresorufin-O-dealkylases (EROD, MROD, BROD, and PROD), p-nitrophenol-hydroxylase (PNPH), coumarin-7-hydroxylase (COH), and UDP-glucuronosyltransferase (UGT) activities were measured in hepatic microsomes. Age-matched mice of the same sex and strain were used as controls. In S....
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Schistosoma mansoni; Pharmacokinetics; Cytochrome P-450; Monooxygenases; Granuloma; Liver microsomes.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000500008

Indirect effects of oral tolerance to ovalbumin interfere with the immune responses triggered by Schistosoma mansoni eggs
Provedor de dados: 56
Autores: Carvalho,C.R.; Lenzi,H.L.; Correa-Oliveira,R.; Vaz,N.M.
The objective of the present study was to investigate whether the injection of a tolerated protein (indirect effects) affects the formation of granulomas around Schistosoma mansoni eggs trapped in the lungs after intravenous (iv) injection into normal (noninfected) C57BL/6 mice (6 animals per group). To induce oral tolerance to chicken egg ovalbumin a 1/5 dilution of egg white in water was offered ad libitum in a drinking bottle for 3 days. Control mice received water. After 7 days, control and experimental animals were injected iv with 2,000 S. mansoni eggs through a tail vein. In some mice of both groups the iv injection of eggs was immediately followed by intraperitoneal (ip) immunization with 10 µg of dinitrophenylated conjugates of ovalbumin (DNP-Ova)...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Oral tolerance; Ovalbumin; Granuloma; Schistosoma mansoni.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001000012

Collagen arrangement in hepatic granuloma in mice infected with Schistosoma mansoni: dependence on fiber radiation centers
Provedor de dados: 56
Autores: Lenzi,H.L.; Kimmel,E.; Schechtman,H.; Pelajo-Machado,M.; Vale,B.S.; Panasco,M.S.; Lenzi,J.A.
The collagen structure of isolated and in situ liver granuloma from Swiss Webster mice infected with Schistosoma mansoni was sequentially and three-dimensionally analyzed during different times of infection (early acute, acute, transitional acute-chronic, and chronic phases) by laser scanning confocal microscopy and electron scanning variable vacuum microscopy. The initial granuloma structure is characterized by vascular collagen residues and by anchorage points (or fiber radiation centers), from where collagenous fibers are angularly shed and self-assembled. During the exudative-productive stage, the self-assembly of these fibers minimizes energy and mass through continuous tension and focal compression. The curvature or angles between collagen fibers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Granuloma; Schistosoma mansoni; Collagen; Extracellular matrix; Confocal microscopy.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000500018

Ultrastructural and biochemical detection of biotin and biotinylated polypeptides in Schistosoma mansoni
Provedor de dados: 56
Biotinylation is proposed for the identification of surface proteins in Schistosoma mansoni using the streptavidin-HRP conjugate for the detection of labeled polypeptides. However, control samples also showed several endogenous biotinylated polypeptides. In an attempt to determine the possibility of nonspecific binding between the streptavidin-HRP conjugate and polypeptides from S. mansoni, the conjugate was blocked with biotinamidecaproate-N-hydroxysuccinimide ester (BcapNHS) before biotin-streptavidin blotting. No bands were detected on the nitrocellulose sheet, demonstrating the specific recognition of biotin by the streptavidin present in the conjugate. Whole cercariae and cercarial bodies and tails showed several endogenous biotinylated polypeptides....
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Biotin; Biotinylated polypeptides; Schistosoma mansoni.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000700003

Interferon gamma is a key cytokine in lung phase immunity to schistosomes but what is its precise role?
Provedor de dados: 56
Autores: Wilson,R.A.
Vaccination of mice with radiation-attenuated cercariae of Schistosoma mansoni induces a high level of protection against challenge with normal larvae. The immune effector mechanism, which operates in the lungs, is a cell-mediated delayed-type hypersensitivity response and involves the formation of a tight focus of mononuclear cells around embolised larvae. CD4+ T cells with Th1 characteristics are a major component of the infiltrate. They secrete abundant interferon gamma (IFN&lt;FONT FACE="Symbol"&gt;g&lt;/font&gt;) upon antigen stimulation in vitro, whilst in vivo neutralisation of the cytokine results in 90% abrogation of immunity. IFN&lt;FONT FACE="Symbol"&gt;g&lt;/font&gt; can induce a large number of genes and an attempt has been made to identify...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interferon gamma; Schistosoma mansoni; Lung phase immunity; Nitric oxide; Adhesion molecule.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000100022