目的:通过构建营养性肥胖雄性大鼠的模型,探讨下丘脑弓状核kisspeptin/kiss1r系统和促性腺激素释放激素(GnRH)的表达和作用,以及对下丘脑-垂体-睾丸轴(HPT)的影响。方法:孕14 d SD大鼠,其后代随机分为正常组和高能饲料组,构建营养性肥...目的:通过构建营养性肥胖雄性大鼠的模型,探讨下丘脑弓状核kisspeptin/kiss1r系统和促性腺激素释放激素(GnRH)的表达和作用,以及对下丘脑-垂体-睾丸轴(HPT)的影响。方法:孕14 d SD大鼠,其后代随机分为正常组和高能饲料组,构建营养性肥胖模型。将肥胖大鼠进一步分为对照组和实验组,实验组侧脑室注入kisspeptin。记录体重参数和内分泌激素的改变;免疫组化和Western印迹检测各组大鼠下丘脑弓状核中瘦素受体(LepR)、kisspeptin、kiss1r和GnRH的蛋白表达。qRT-PCR检测各组大鼠下丘脑弓状核GnRH mRNA的表达。结果:成功构建营养性肥胖大鼠,体重参数和内分泌激素改变明显。相比较正常组,对照组大鼠弓状核LepR、kisspeptin和GnRH表达减少,侧脑室注入kisspeptin后,实验组大鼠弓状核GnRH显著增加,血清LH和T水平显著升高,未见LepR和kiss1r的改变。结论:中枢注入kisspeptin可以显著改善由营养性肥胖引起的GnRH低表达,纠正HPT轴功能失调,进而改善生殖功能。展开更多
Objective To explore the potential function of nutrition on kisspeptin/kisspeptin receptor （kisslr） system in the arcuate nucleus （ARC） of male rats. Methods Pregnant rats were obtained and male pups were used to ...Objective To explore the potential function of nutrition on kisspeptin/kisspeptin receptor （kisslr） system in the arcuate nucleus （ARC） of male rats. Methods Pregnant rats were obtained and male pups were used to establish obesity model. Body parameters and blood samples were evaluated. Immunohistochemistry was used to determine the localizations and protein levels of kisspeptin, kisslr, and leptin receptor （LepR） immunoreactivity （IR） in ARC. QRT-PCR was used to determine kissl-, kisslr-, LepR-, and GnRH-mRNA levels. Results The establishment of obesity model was successful as body parameters and hormones levels changed noticeably. Kisspeptin-, kisslr-, and LepR-IR were detected and protein levels decreased significantly in high-fat-diets （HFD） rats than controls. The mRNA levels of kissl, LepR and GnRH significantly decreased in the ARC of HFD-fed rats. No difference was observed in kisslr mRNA levels between the two groups. Conclusion These data suggest that failure to increase GnRH levels with HFD may be associated with pubertal down-regulation of LepR and kisspeptin/kisslr system in the ARC of male rats.展开更多
文摘目的:通过构建营养性肥胖雄性大鼠的模型,探讨下丘脑弓状核kisspeptin/kiss1r系统和促性腺激素释放激素(GnRH)的表达和作用,以及对下丘脑-垂体-睾丸轴(HPT)的影响。方法:孕14 d SD大鼠,其后代随机分为正常组和高能饲料组,构建营养性肥胖模型。将肥胖大鼠进一步分为对照组和实验组,实验组侧脑室注入kisspeptin。记录体重参数和内分泌激素的改变;免疫组化和Western印迹检测各组大鼠下丘脑弓状核中瘦素受体(LepR)、kisspeptin、kiss1r和GnRH的蛋白表达。qRT-PCR检测各组大鼠下丘脑弓状核GnRH mRNA的表达。结果:成功构建营养性肥胖大鼠,体重参数和内分泌激素改变明显。相比较正常组,对照组大鼠弓状核LepR、kisspeptin和GnRH表达减少,侧脑室注入kisspeptin后,实验组大鼠弓状核GnRH显著增加,血清LH和T水平显著升高,未见LepR和kiss1r的改变。结论:中枢注入kisspeptin可以显著改善由营养性肥胖引起的GnRH低表达,纠正HPT轴功能失调,进而改善生殖功能。
基金supported by grants from the Natural Science Foundation of Shandong,Peoples’ Republic of China(ZR2012HM039)
文摘Objective To explore the potential function of nutrition on kisspeptin/kisspeptin receptor （kisslr） system in the arcuate nucleus （ARC） of male rats. Methods Pregnant rats were obtained and male pups were used to establish obesity model. Body parameters and blood samples were evaluated. Immunohistochemistry was used to determine the localizations and protein levels of kisspeptin, kisslr, and leptin receptor （LepR） immunoreactivity （IR） in ARC. QRT-PCR was used to determine kissl-, kisslr-, LepR-, and GnRH-mRNA levels. Results The establishment of obesity model was successful as body parameters and hormones levels changed noticeably. Kisspeptin-, kisslr-, and LepR-IR were detected and protein levels decreased significantly in high-fat-diets （HFD） rats than controls. The mRNA levels of kissl, LepR and GnRH significantly decreased in the ARC of HFD-fed rats. No difference was observed in kisslr mRNA levels between the two groups. Conclusion These data suggest that failure to increase GnRH levels with HFD may be associated with pubertal down-regulation of LepR and kisspeptin/kisslr system in the ARC of male rats.
