CORRELATION OF ANNUAL CHANGE OF LUTEINIZING HORMONE-RELEASING HORMONE (LH-RH) WITH GONADAL DEVELOPMENT IN AMPHIOXUS

The present study demonstrates for the first time by RIA that LH-RH is present in the heads as well as the bodies of the amphioxuses of both sexes. Gonadoliberin increases gradually during the course of gonadal development. At the time of gonadal maturity, LH-RH content reaches a maximum. The annual change of LH-RH correlates well with gonadal development and the gonadosomatic index (GSI). The reproductive season of the amphioxus covers about three months from May to July, and LH-RH content starts to increase in May (66.89±5.26 ng) and reaches the peak in June (158.57±3.17 ng), indicating that LH-RH is likely also to be involved in the reproductive activity of the chordate. This finding is of significance in understanding the evolutionary process of the reproductive endocrine in the vertebrate.     

强啡肽(DYN)对人胎盘绒毛组织促性腺素分泌的影响

用胎盘绒毛组织体外孵育法(无血清培液)研究了强啡肽对妊娠6～10周人胎盘绒毛组织分泌促性腺素的影响.结果表明,当DYN浓度为10~(-9)mol/L,与对照组相比,有明显的刺激作用(P<0.05);浓度为10~(-10)mol/L,刺激作用最强(p<0.001).DYN可能在胎盘绒毛组织分泌hCG中起重要作用.     

文昌鱼促黄体素释放素(LH-RH)的周年变化及其与性腺发育的相互关系

本文用放射免疫测定法首次发现,在性腺发育过程中,雌、雄文昌鱼头部的LH-RH含量和全身的LH-RH总含量逐渐增加。在性腺成熟时,LH-RH的含量达最大值。同时,文昌鱼LH-RH的周年变化与它的性腺发育周期和生殖指数十分一致。性腺发育周期的研究结果指出,文昌鱼的生殖季节为5月至7月,LH-RH含量在5月开始上升(66.89±5.26ng),6月达高峰(158.57±3.17ng)。这些结果指出文昌鱼的LH-RH在调控性腺发育和生殖活动中起重要作用。这对于了解文昌鱼在生殖内分泌进化中的地位及其与脊椎动物的亲缘关系方面也有重要意义。