红景天抗大鼠嗅球衰老机制的研究

目的 :探讨红景天抗老龄大鼠嗅球衰老的机制。方法 :取健康大鼠 ,青龄组 (3个月 ) 10只 ;老龄组(2 6个月 ) 2 0只 (随机分成老龄对照组、老龄红景天组各 10只 ) ;均断头处死 ,取嗅球 ,经石蜡包埋 ,连续切片 ,免疫组化染色 ,光镜观察。结果 :成纤维细胞生长因子 (FGF)及凋亡相关基因 (Bcl 2和Bax)主要表达在大鼠嗅球的僧帽细胞 ;青龄组FGF和Bcl 2阳性细胞表达率均显著高于老龄对照组 (P <0 .0 1) ,且FGF和Bcl 2蛋白的表达呈明显正相关 (P <0 .0 1) ;而青龄组Bax阳性细胞表达率略低于老龄对照组 ,但差异不显著 (P >0 .0 5 )。老龄红景天组FGF和Bcl 2蛋白阳性细胞表达率明显高于老龄对照组 (P <0 .0 1)。结论 :大鼠嗅球老化与FGF和Bcl 2蛋白表达减少密切相关 ;推测红景天可能是通过上调嗅球中FGF蛋白的表达 ,诱导僧帽细胞Bcl 2蛋白表达增多 ,抑制嗅球中僧帽细胞的凋亡是其抗大鼠嗅球衰老的重要机制。

Study on molecular mechanism of anti-aging effect of rhidosin on olfactory bulb in senile rats

OBJECTIVE: To research the molecular mechanism of anti-aging effect of rhidosin on olfactory bulb in senile rats. METHOD: Ten 3 month-old rats and twenty 26-month-old rats were randomed in rhidosin and saline groups. After decapitated the rats, the olfactory bulb were cut and immediately fixed with neutral formation, followed with paraffin-embedding, serial sectioning, immunohistochemical staining and light microscopic observation. RESULT: The proteins of FGF, Bcl-2 and Bax were mainly expressed in mitral cells in the olfactory bulb of the rats. The positive expression rate of FGF and Bcl-2 in young rats group was significantly higher than that in old rats group(P < 0.01). The FGF and Bcl-2 were positive relationship(r = 0.8971; P < 0.01). The expression of Bax in young control group was slightly lower than that in old control group, but there was no significant difference (P > 0.05). The positive expression rate of FGF and Bcl-2 in rhidosin group was significantly higher than that in control group in old rate group(P < 0.01). CONCLUSION: FGF is a factor of ascending the anti-apoptosis gene Bcl-2 in mitral cells; rhidosin can increase the expression of FGF and Bcl-2 proteins. We guess that the mechanism of rhidosin anti-aging effect on the olfactory system may be through the effect of increasing the expression of FGF to inhibit the apoptosis of mitral cells.