生物胺对锯缘青蟹精巢发育的调控作用

采用活体注射和体外培养方法,以精巢指数、精巢生精小管的成熟节段比例和促雄腺B型细胞比例为量化指标,观察3种生物胺对雄性锯缘青蟹生殖神经内分泌的调控作用.活体注射实验表明:5-HT组锯缘青蟹精巢发育和促雄腺分泌活动具有显著的促进作用;DA组精巢发育受到抑制,但促雄腺细胞的分泌活动不受影响;OA组与同步对照组差异不显著.离体实验表明:5-HT刺激了脑和胸神经团的分泌活动,从而促进促雄腺分泌活动;OA和DA对脑和胸神经团分泌活动没有明显影响.视神经节的生殖内分泌活动几乎不受3种生物胺的影响.本实验首次报道了体外条件下生物胺对雄性甲壳动物生殖神经内分泌的调控作用,支持了5-HT首先刺激脑和胸神经团分泌GSH,再通过促雄腺活动从而促进精巢发育的观点.

Effects of biogenic amines on the testicular development in male mud crabs, Scylla serrata

The regulation of three biogenic amines over the reproductive neuroendocrine activity of male Scylla serratawas investigated byin vivo injection and in vitro incubation.The testicular index,the ratio of the mature sections among the seminiferous tubules,and the ratio of Type B cells among the androgenic glandular cells were taken as the quantitative indexes.In vivoinjections indicated that: 5-HT can significantly promote the testicular development and the secretion of the androgenic gland in S.serrata;DA can inhibit the testicular development,but no influence on the secretion of the androgenic gland is found;no significant difference was observed between the OA-injected group and the concurrent control.In vitroincubations showed that: 5-HT can stimulate the secretion of the brain and the thoracic ganglia,thus accelerate that of the androgenic gland;in the OA and the DA groups,however,no significant influence on the secretion of the brain and the thoracic ganglia was observed.As to the optic ganglia,the three biogenic amines hardly have any effects on the secretion.It is the first time for in vitro experiments to report the regulation of biogenic amines over the reproductive neuroendocrine of male crustaceans.Our results corroborate that 5-HT first activate the brain and the thoracic ganglia to secret GSH,then promote the testicular development through the androgenic gland.