Sperm Capacitation
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Association of L-arginine with heparin on the sperm capacitation improves in vitro embryo production in bovine
Abstract We aimed to evaluate the effects of L-arginine (L-arg) in the quality of in vitro heparin-induced capacitation of cryopreserved bovine spermatozoa and its effects on IVP. The experimental groups were: Control 0 hour without pre-capacitation, and groups of sperm capacitated for 30 min in the absence of COC with heparin (Control 30 min), with 1 mM L-a
Anim. Reprod.. Publicado em: 25/11/2019
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2. Efeito da adição de plasma seminal oriundo de animais de alta e baixa fertilidade na criopreservação de espermatozoides da cauda do epidídimo e do ejaculado de garanhões subférteis
RESUMO O objetivo do presente estudo foi avaliar o efeito da adição de plasma seminal de garanhões de alta e baixa fertilidade sobre a congelabilidade e a viabilidade de espermatozoides do ejaculado (EJ) e do epidídimo (EP) de garanhões subférteis. Foram utilizados seis garanhões com histórico de subfertilidade. Após coleta, espermatozoides do ejacu
Arq. Bras. Med. Vet. Zootec.. Publicado em: 14/06/2019
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3. Mini-percoll gradient may be used for frozen-thawed sperm selection in sheep
RESUMO O presente estudo avaliou o efeito do aumento da força de centrifugação, bem como da redução do tempo de centrifugação e do volume do gradiente de Percoll em diferentes protocolos nos parâmetros espermáticos de ovinos. Foi utilizado sêmen comercial de carneiros da raça Santa Inês, e cinco tratamentos foram realizados: Percoll tradicional e
Arq. Bras. Med. Vet. Zootec.. Publicado em: 06/06/2019
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4. Measurement of sperm capacitation and acrosome reaction. like changes by chlortetracycline test (CTC) can predict the freezability of ram semen?
2008
Reproduction in Domestic Animals. Publicado em: 2011
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5. Efeito de diferentes concentrações de plasma seminal na criopreservação de sêmen eqüino
One of the major limiting factors of equine frozen semen is the low fertility obtained. During freezing process spermatozoa undergoes a series of damages such as changes in membrane components, premature capacitation, chromatin damages and oxidative stress. Sperm cells are very susceptible to oxidative stress due to high concentration of polyunsaturated fatt
Publicado em: 2006
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6. Efeito in vitro da adição do levonorgestrel sobre a concentração intracelular de calcio em espermatozoides de homens ferteis
The spermatozoa is a highly specialized cell because it contains morfophysiological modifications that guarantees fecundation success. Spermatozoa must undergo three sequential changes before they acquire their fertilizing capacity: maturation in epididymis, capacitation and acrosome reaction (RA). Capacitation is a process that takes place in the female rep
Publicado em: 2006
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7. Efeito de bloqueadores de canais de íons cálcio sobre espermatozóides e oócitos de hamsters fecundados in vivo e in vitro / Effects of calcium ion channel blockers on hamster spermatozoa and oocytes in in vivo and in vitro fertilization
Fertilization process is closely related with calcium ion. There are reports about voltage-dependent calcium ion channel blockers of anti-hypertension therapeutic use causing male infertility, but there are few reports about such effects on the oocyte. The main goal of this experiment was to check the influence of verapamil, nifedipine and diltiazem (L-type
Publicado em: 2004
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8. Study of the effect of ocelot (Leopardus pardalis; Linnaeus, 1758) semen manipulation on capacitation and on morphological and functional integrity of spermatozoa / Estudo do efeito das condições de manipulação do sêmen de jaguatiricas (Leopardus pardalis, Linnaeus, 1758) sobre a capacitação e a integridade morfológica e funcional dos espermatozóides
O presente estudo visou investigar o efeito da refrigeração do sêmen da jaguatirica sobre o Índice de Motilidade Espermática [IME=(%M+MPx5)/2; %M = proporção de espermatozóides móveis; MP = motilidade progressiva], integridade acrossomal (IA) e capacitação espermática; assim como avaliar a eficácia da técnica FITC-PNA/IP na avaliação simultâ
Publicado em: 2003
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9. Impacto das tecnicas de reprodução assistida no tratamento da infertilidade masculina
From 1990 to 1 994, 331 male patients with primary infertility were treated at the Department of Urology of the University of Campinas Medical School - UNICAMP. The initial approach included conventional medical and surgical (varicocelectomy) regimens. Patients who did not achieve pregnancy with these modalities underwent assisted reproduction therapy. The c
Publicado em: 1995
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10. Timing of fertilization in mammals: sperm cholesterol/phospholipid ratio as a determinant of the capacitation interval.
A survey of species differences in the duration of capacitation, T, has revealed that they closely correlate with sperm cholesterol/phospholipid mole ratios, R : T = 8R - 1 (r2 = 0.97, in which r is Pearson's correlation coefficient). Because uterine cells displayed low relative cholesterol concentrations, spermatozoa evidently experience a negative external
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11. Role of tyrosine phosphorylation in sperm capacitation / acrosome reaction
Capacitation is an important physiological pre-requisite before the sperm cell can acrosome react and fertilize the oocyte. Recent reports from several laboratories have amply documented that the protein phosphorylation especially at tyrosine residues is one of the most important events that occur during capacitation. In this article, we have reviewed the da
BioMed Central.
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12. Control of the low voltage-activated calcium channel of mouse sperm by egg ZP3 and by membrane hyperpolarization during capacitation
Sperm adhesion to egg zonae pellucidae initiates sperm acrosome reactions, an exocytotic event that is an early step during fertilization. Previously, it was suggested that zona pellucida-evoked Ca2+ entry into sperm through low voltage-activated Ca2+ channels is an essential step in acrosome reactions, based on the inhibitory effects of Ca2+ channel antagon
The National Academy of Sciences.