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- ItemAcesso aberto (Open Access)Análise proteômica quantitativa de plasma seminal e sua associação com aspectos funcionais dos espermatozoides e com o nível de peroxidação lipídica no plasma seminal(Universidade Federal de São Paulo (UNIFESP), 2014) Intasqui Lopes, Paula [UNIFESP]; Bertolla, Ricardo Pimenta [UNIFESP]; http://lattes.cnpq.br/8479803539567479; http://lattes.cnpq.br/5188240479960852; Universidade Federal de São Paulo (UNIFESP)funcionais nos espermatozoides e o nivel seminal de peroxidacao lipidica. Metodo: Um estudo transversal foi realizado incluindo 156 pacientes normozoospermicos. Apos a coleta do semen por masturbacao, uma aliquota foi utilizada para a analise seminal e outra para a avaliacao da atividade mitocondrial, da integridade do acrossoma e da integridade do DNA dos espermatozoides. O volume remanescente de semen foi centrifugado e o plasma seminal sobrenadante foi utilizado para a avaliacao do nivel seminal de peroxidacao lipidica e para a analise proteomica. Posteriormente, os pacientes foram divididos em percentis (15%) para formacao dos grupos experimentais de cada estudo: Estudo 1 - alta (grupo controle) e baixa (grupo alterado) atividade mitocondrial dos espermatozoides, Estudo 2 - alta (grupo controle) e baixa (grupo alterado) integridade do acrossoma dos espermatozoides, Estudo 3 - baixa (grupo controle) e alta (grupo alterado) fragmentacao do DNA dos espermatozoides e Estudo 4 - baixo (grupo controle) e alto (grupo alterado) niveis seminais de peroxidacao lipidica. A analise proteomica foi realizada utilizando LCMS/MS. Os grupos foram comparados por meio de analise univariada (teste t de Student) e analise multivariada (PLS-DA e analise discriminante). As proteinas significantes foram posteriormente submetidas a analise de enriquecimento funcional. Resultados: Nos estudos 1, 2, 3 e 4 foram observadas 506, 493, 474 e 629 proteinas, respectivamente. As funcoes enriquecidas no estudo 1 foram detoxificacao de EROs e ligacao a NADP (controle) e atividade de oxidoredutase intramolecular, catabolismo de aminoglicanos, inibicao de endopeptidases, lisossomos e resposta imune de fase aguda (alterado). As principais funcoes enriquecidas no estudo 2 foram resposta imune (controle) e inibicao de fosfolipase, metabolismo do acido araquidonico, exocitose, resposta inflamatoria aguda, resposta ao peroxido de hidrogenio e transporte lisossomal (alterado). As principais funcoes enriquecidas no estudo 3 foram metabolismo de carboidratos, regulacao de lipoproteinas, regulacao negativa da apoptose, metabolismo de hormonios, atividade de metalopeptidases, ligacao ao NAD e lisossomos (controle) e biossintese de prostaglandinas e ligacao a acidos graxos (alterado). As principais funcoes enriquecidas no estudo 4 foram biossintese de acidos graxos insaturados, atividade de oxidantes e antioxidantes e resposta celular ao estresse termico (alterados). Nos estudos 1, 2, 3 e 4 foram sugeridos 8, 6, 8 e 7 biomarcadores seminais de atividade mitocondrial, integridade acrossoma, fragmentacao de DNA e peroxidacao lipidica, respectivamente. Conclusoes: O perfil proteomico do plasma seminal reflete alteracoes funcionais dos espermatozoides e o nivelseminal de peroxidacao lipidica e diversas funcoes pos-genomicas estao relacionadas as alteracoes estudadas. Proteinas relacionadas as alteracoes funcionais dos espermatozoides e ao nivel seminal de peroxidacao lipidica constituem potenciais biomarcadores seminais para cada alteracao
- ItemSomente MetadadadosAssociation between the seminal plasma proteome and sperm functional traits(Elsevier Science Inc, 2016) Intasqui, Paula [UNIFESP]; Camargo, Mariana [UNIFESP]; Antoniassi, Mariana Pereira [UNIFESP]; Cedenho, Agnaldo Pereira [UNIFESP]; Carvalho, Valdemir Melechco; Morais Cardozo, Karina Helena; Zylbersztejn, Daniel Suslik [UNIFESP]; Bertolla, Ricardo Pimenta [UNIFESP]Objective: To analyze the seminal plasma proteome and biological functions associated with sperm functional alterations. Design: Cross-sectional study. Setting: University andrology and research laboratories. Patient(s): A total of 156 normozoospermic men. Intervention(s): Sperm mitochondrial activity, acrosome integrity, and DNA fragmentation were evaluated in a semen aliquot. Remaining semen was centrifuged, and seminal plasma was utilized for proteomic analysis (liquid chromatography-tandem mass spectrometry). Patients were divided into percentiles (15%) to form the following groups: substudy 1, high (control, n = 26) and low (study, n = 23) sperm mitochondrial activity; substudy 2, high (control, n = 23) and low (study, n = 22) sperm acrosome integrity; and substudy 3, low (control, n = 22) and high (study, n = 22) sperm DNA fragmentation. Groups were compared using univariate and multivariate analyses. Differentially expressed proteins were used for functional enrichment analysis. Main Outcome Measure(s): Seminal plasma proteome and postgenomic pathways are associated with several sperm functional traits. Result(s): In total, 506, 493, and 464 proteins were observed in substudies 1, 2, and 3, respectively. Enriched functions in substudy 1 were intramolecular oxidoreductase activity, aminoglycans catabolism, endopeptidases inhibition, lysosomes, and acute-phase response (study group). In substudy 2, main enriched functions were phospholipase inhibition, arachidonic acid metabolism, exocytosis, regulation of acute inflammation, response to hydrogen peroxide, and lysosomal transport (study group). In substudy 3, enriched functions were prostaglandin biosynthesis and fatty acid binding (study group). We proposed eight, six, and eight seminal biomarkers for substudies 1, 2, and 3, respectively. Conclusion(s): Seminal plasma proteome reflects sperm mitochondrial activity reduction, acrosome damage, and DNA fragmentation, with several postgenomic functions related to these alterations. (C) 2016 by American Society for Reproductive Medicine.
- ItemAcesso aberto (Open Access)Efeito da varicocele na função dos espermatozóides(Universidade Federal de São Paulo (UNIFESP), 2009-02-27) Blumer, Camile Garcia [UNIFESP]; Cedenho, Agnaldo Pereira [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objectives: to assess the effect of varicocele on sperm nuclear DNA integrity, mitochondrial activity, lipid peroxidation and acrosome integrity. Methods: semen samples were obtained and analyzed according to the World Health Organization guidelines (1999) and sperm morphology was evaluated by Kruger’s strict criteria (1986). The study group included 30 men with varicocele grades II or III and the control group included 32 men without varicocele. Sperm nuclear DNA integrity was assessed by the alkaline Comet assay, and cells were graded according to the intensity of DNA damage: class I (high DNA integrity), class II (DNA still intact or initiating fragmentation), class III (DNA fairly fragmented) and class IV (DNA extremely fragmented). Mitochondrial activity was evaluated by the colorimetric method proposed by Hrudka (1987). Cells were classified according to the proportion of active mitochondria: class I (100% of active mitochondria), class II (more than 50% of active mitochondria), class III (less than 50% of active mitochondria) and class IV (100% of inactive mitochondria). Lipid peroxidation was determinated by Ohkawa’s method, which is based on the measurement of malondialdehyde (MDA) due to its reaction with thiobarbituric acid (TBA), and the levels of lipid peroxidation were described as nanograms of TBARS/mL. Acrosome integrity was assessed by use of the conjugated fluorescent probe PNA-FITC and the results were expressed in percentages of intact acrosomes (fluorescence was observed over the entire acrosomal region of the sperm head). Results: Concerning DNA integrity, the varicocele group showed less spermatozoa with intact nuclear DNA (grade II, p=0,040). There was no significant difference in classes I, III and IV between the two groups. Regarding mitochondrial activity the varicocele group showed more cells with inactive mitochondria (class III, p=0,001) and less cells with active mitochondria (class I, p=0,005). There was no difference in classes II and IV. Also, the varicocele group showed less spermatozoa with intact acrosomes (p=0,0002), when compared to the controls. Finally, no significant differences were observed in lipid peroxidation levels. Conclusions: This study was able to demonstrate that varicocele in adults is associated with increased DNA fragmentation, reduced mitochondrial activity and decreased acrosome integrity even when semen quality does not differ from men without varicocele. However, levels of seminal products of lipid degradation (MDA) are not increased in these patients, suggesting that perhaps the functional changes found are not directly associated with oxidative stress, or that oxidative stress leads to changes in DNA, acrosomes and mitochondria during spermatogenesis, and not after ejaculation.
- ItemSomente MetadadadosEfeito do fluido peritoneal de pacientes inférteis com endometriose e inférteis de causa desconhecida na reação acrossômica de espermatozóides capacitados(Universidade Federal de São Paulo (UNIFESP), 1996) Passos, Eduardo Pandolfi [UNIFESP]; Lima, Geraldo Rodrigues de [UNIFESP]
- ItemAcesso aberto (Open Access)Effects of pentoxifylline treatment before freezing on motility, viability and acrosome status of poor quality human spermatozoa cryopreserved by the liquid nitrogen vapor method(Associação Brasileira de Divulgação Científica, 2007-07-01) Esteves, Sandro Cassiano [UNIFESP]; Spaine, Deborah Montagnini [UNIFESP]; Cedenho, Agnaldo Pereira [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Centro de Referência em Reprodução MasculinaThe objective of the present study was to investigate the effects of the direct addition of pentoxifylline (PF) to the ejaculates of men with poor sperm quality before freezing on post-thaw sperm motility, viability, acrosome integrity, and agonist-induced acrosome reaction. Semen specimens from 16 infertile men with impaired sperm count and motility (oligoasthenozoospermia) were divided into two equal aliquots: one received no treatment (control) while the other was incubated with 5 mM PF (treated). Both aliquots were cryopreserved by the liquid nitrogen vapor method. Motility was assessed according to WHO criteria. Acrosome integrity and spontaneous and calcium ionophore-induced acrosome reactions were assessed with fluorescein isothiocyanate-conjugated peanut agglutinin combined with a supra-vital dye (Hoechst-33258). Cryopreservation impaired sperm motility (percentage reduction: 87.4 (interquartile range, IQ: 70.3-92.9) vs 89.1 (IQ: 72.7-96.0%)), viability (25.9 (IQ: 22.2-29.7) vs 25.6 (IQ: 19.7-40.3%)) and acrosome integrity (18.9 (IQ: 5.4-38.9) vs 26.8 (IQ: 0.0-45.2%)) to the same extent in both treated and control aliquots. However, PF treatment before freezing improved the acrosome reaction to ionophore challenge test scores in cryopreserved spermatozoa (9.7 (IQ: 6.6-19.7) vs 4.8 (IQ: 0.5-6.8%); P = 0.002). These data show that pre-freeze treatment of poor quality human sperm with pentoxifylline did not improve post-thaw motility or viability nor did it prevent acrosomal loss during the freeze-thaw process. However, PF, as used, improved the ability of thawed spermatozoa to undergo the acrosome reaction in response to calcium ionophore. The present data indicate that treatment of poor quality human sperm with PF may enhance post-thaw sperm fertilizing ability.