摘要
目的:探讨瘦素(leptin)对神经内分泌-生殖轴的可能调节机制。方法:建立卵巢摘除补充雌激素(OEP)大鼠模型,动物随机分为leptin组、α-黑素细胞刺激素(α-MSH)组和生理盐水对照组,于侧脑室注射后1h、2h、4h和6h分别取血和脑组织。ELISA法检测血中促性腺释放激素(Gn-RH)、黄体生成素(LH)和卵泡刺激素(FSH)浓度。Western印迹检测下丘脑组织中阿片促黑激素皮质素原(POMC)蛋白量的变化。结果:侧脑室注射leptin可促进GnRH、FSH、LH的分泌,而注射α-MSH则抑制GnRH、FSH和LH的分泌。注射leptin显著增加下丘脑中的POMC含量。结论:Leptin可能通过POMC神经元或与其他途径共同影响下丘脑-垂体生殖轴的分泌功能;POMC神经元发挥的调节作用可能晚于或弱于其它神经元。
Objective: To explore the effects of leptin on neuroendocrine function of the hypothalamus-pituitary-ovary axis.Methods: The female rats were ovariectomized and estrogen-primed(OEP).The animals were randomly divided into 3 injection groups of the physiological saline,the leptin and the α-melanophore-stimulating hormone(MSH).The blood and brain tissues were separately collected at 1,2,4 and 6 hours after the intracerebroventricular injection.The levels of serum gonadotropin-releasing hormone(GnRH),luteinizing hormone(LH) and follicle-stimulating hormone(FSH) were examined respectively using enzyme-linked immunosorbent assay(ELISA) kits.The proopiomelanocortin(POMC) protein contents of the hypothalamus were examined by Western blotting.Results: Leptin stimulated the secretion of GnRH,LH and FSH;however the α-MSH inhibited the secretion of the hormones.The POMC protein contents in hypothalamus were significantly increased after leptin injection.Conclusion: The effect of leptin on the neuroendocrine function of hypothalamus-pituitary-ovary axis is perhaps exerted by POMC neurons or together with other channels.The regulation of POMC neurons is probably later and weaker than that of other neurons.
出处
《中国计划生育学杂志》
北大核心
2010年第3期143-146,共4页
Chinese Journal of Family Planning
基金
河北省科技厅基金(No:8726101D-20)
河北省教育厅基金(No:2008301)
河北省承德市科技技术研究与发展指导计划项目(No:200922061)
关键词
动物模型
卵巢摘除补充雌激素大鼠
侧脑室注射
瘦素
Α-黑素细胞刺激素
阿片促黑激素皮质素原
Experimental animal models
Ovariectomized estrogen-primed rat
Intracerebroventricular injection
leptin
α-melanocyte-stimulating hormone
Proopiomelanocortin