BDNF 及其受体在多囊卵巢综合征大鼠中的表达?

目的：研究脑源性神经营养因子(BDNF)及其受体基因在来曲唑诱导的多囊卵巢综合征(PCOS)大鼠模型卵巢组织中的定量表达。方法将 SD 大鼠分成两组，模型组20只，对照组20只，每日定时称量大鼠体质量并观察两组大鼠的体质量变化。应用来曲唑诱导大鼠 PCOS 模型，放射免疫法测定血清性激素水平，苏木素-伊红(HE)染色法观察卵巢组织学变化，实时定量荧光 PCR 法检测 BDNF 及 TrkB、p75基因的表达。结果模型组增加的体质量显著高于对照组(P <0.01)。与对照组比较，模型组血清睾酮、促黄体生成激素、促卵泡激素水平显著增高，雌二醇、孕酮水平显著降低，差异均有统计学意义(P <0.05)。模型组卵巢体积增大，囊状扩张卵泡明显增多，黄体数量明显减少。模型组卵巢组织中 BDNF mRNA 和 p75 mRNA 水平显著高于对照组(P <0.05)，而 TrkB mRNA 水平显著低于对照组(P <0.05)。结论卵巢组织内 BDNF/TrkB/p75表达水平的变化可能与 PCOS 卵泡发育障碍相关。

Expression of BDNF and its receptors in polycystic ovary syndrome in rats

Objective To investigate the expression of Brain-derived neurotrophic factor (BDNF)and its receptors mRNAs in ovary tissues of letrozole-induced polycystic ovary syndrome (PCOS)in rats.Methods The SD rats were divided into two groups (moder group and control group),20 rats in each group.The rat models of PCOS were established by letrozole.Serum sex hormone levels were determined by radioimmunoassay.The histologic changes in ovaries were observed by Hematoxylin-eosin stai-ning,and the expression of BDNF and its receptors gene in ovary tissues was detected by Real-time PCR.Results Although the se-rum testosterone,follicle-stimulating hormone and luteinizing hormone levels in model group were markedly increased more than those in the control group (P < 0.01 ),estradiol and progesterone in model group showed a considerable reduction (P < 0.05 ). When compared with the control group,model group rats showed increased ovarian volume and high incidence of subcapsular ovari-an cysts together with decreased number of corpora lutea.The expression of BDNF and p75 mRNAs was significantly higher in model group than that in the control group(P <0.05),but the expression of TrkB mRNA reduced(P <0.05).Conclusion BDNF/TrkB/p75 expressed in ovarian tissues may play a specific role on follicular developmental disorders in letrozole-induced PCOS rats.