[Capacitating action of GABA and progesterone in spermatozoa of human and guinea pig in vitro].

作者：Zhang Zh, Chen Wy, Shi Qx, Yuan Yy, Lou Yc · 发表于：PubMed · 年份：2000 · 被引用次数：5 · 研究领域：Sperm and Testicular Function、Stress Responses and Cortisol、Healthcare and Venom Research

This study was designed to investigate whether GABA is involved in the capacitation effect and hyperactivated motility (HAM). Spematozoa from fertile men and retired guinea pigs were washed in modified BWW of 45% 90% Percoll gradient with 26 mg BSA/ml and in low Ca(2+)-MCM of 30%-55%-85% Percoll gradient (approximately 23 micromol/L Ca(2+)) respectively. The samples were preincubated for 2 h under 5% CO2 in air at 38.5 with or without GABA, progesterone (P(4)), GABA(A) receptor agonists or antagonists, and then exposed to 1 micromol/L (for human) or 5 micromol/L (for guinea pigs) calcium ionophore A 23187 for 15 min. The capacitation effect and HAM were assessed by using the chlortetracycline (CTC) staining method and phase-contrast microscopy. Motility was 80% 85% after all additions. The results showed that addition of GABA or P(4) at 5 micromol/L to the incubation medium resulted in a significant increase in the sum of B (characteristic of capacitated cell) and AR (acrosome recation) pattern (65.9% and 61.7% respectively), corresponding to capacitated spermatozoa in human, as compared to the control (37.3%). Likewise, the capacitating effect of GABA on spermatozoa in guinea pigs showed a concentration-dependent increase from 1 to 10 micromol/L(AR: 27.0 +/- 1.9% to 51.6 +/-2.8%). In addition, P(4) potentiated the capacitating effect of GABA when combined with GABA in the capacitation stage. The capacitating effect of GABA was mimicked by a GABAA receptor agonist muscimol. H...