更年健上调老年雌性大鼠下丘脑雌激素受体mRNA表达对P物质和β-内啡肽的影响

目的：探讨中药复方更年健上调老年雌性大鼠下丘脑雌激素受体（ ＥＲ）和 ＥＲ信使核糖核酸（ｍＲＮＡ）对Ｐ物质（ＳＰ）和β－内啡肽（β－ＥＰ）的影响。方法：建立自然衰老的雌性大鼠模型，用放射配体结合分析法检测 ＥＲ，用 Ｎｏｒｔｈｅｒｎ ｂｌｏｔ分析 ＥＲｍＲＮＡ的改变，用放射免疫分析法检测 ＳＰ和β－ＥＰ含量。结果：老年雌性大鼠性减退期下丘脑 ＥＲ和 ＥＲｍＲＮＡ水平随血清Ｅ_２水平的下降较性成熟期显著下降，而更年健则使下降了的ＥＲ和ＥＲｍＲＮＡ水平明显提高，并通过上调下丘脑ＥＲｍＲＮＡ使ＳＰ明显下降，而β－ＥＰ则显著提高，与提高体内雌激素水平具有同样的效果。结论：更年健可增加ＲＲ在下丘脑的表达以增强雌激素的生物学效应，同时降低下丘脑 ＳＰ水平而提高 β－ＥＰ的含量。

Effect of Gengnianjian on up regulated estrogen receptor mRNA to substance P and beta-endorphin in hypothalamus of aging female rats]

OBJECTIVE: To investigate the effect of Chinese herbal formula Gengnianjian on estrogen receptor (ER), ERmRNA substance P (SP) and beta-endorphin (beta-EP) in the hypothalamus of aging female rats. METHODS: ER proteins were determined by radioligand binding assay, ER mRNA was analyzed by Northern blot analysis and the levels of beta-EP and SP were detected by immunohistochemistry. RESULTS: In aging rats, lowered ER and ER mRNA in the hypothalamus were still up-regulated by low serum E2 level, but not in rats of after the age of 21 months; Gengnianjian significantly increased ER protein level and ER mRNA expression, decreased SP and increased the level of beta-EP in the hypothalamus in aging female rats before 21 months of age, without changing of serum E2 level. In EB group, serum E2 and beta-EP levels increased and SP level decreased but ER expression suppressed in the hypothalamus except after 21 months. CONCLUSION: Enhance estrogen bioactivity can decrease the level of SP and increase the level of beta-EP in hypothalamus of aging female rats. Herbal formula Gengnianjian increase-EP level and decrease SP level by raising the level of ER and ER mRNA.