[摘要]目的:觀察益氣、活血方藥對老年大鼠肝臟衰老相關基因表達的影響。方法:以自然衰老大鼠為衰老模型,采用RTPCR、Western blotting法研究益氣、活血方藥對老年大鼠肝臟p16、p21、增殖細胞核抗原(proliferating cell nuclear antigen, PCNA)、cyclin D1和cyclin E mRNA轉錄和蛋白表達的影響。結果:老年大鼠肝臟p16、p21、cyclin D1 mRNA轉錄和蛋白的表達增加;PCNA、cyclin E mRNA轉錄和蛋白的表達降低。與老年大鼠比較,益氣、活血方藥可下調老年大鼠肝臟cyclin D1 mRNA轉錄和蛋白表達,上調促進增殖基因cyclin E mRNA轉錄和蛋白表達,但對p16、p21和PCNA的調節作用不明顯。結論:益氣、活血方藥主要通過調控cyclin D1和cyclin E mRNA轉錄和蛋白表達而促進細胞增殖。
Effects of recipes for replenishing qi and activating blood on senescence related gene expressions in the liver of aging rats
ABSTRACT Objective: To observe the effects of recipes for replenishing qi and activating blood on p16, p21, proliferating cell nuclear antigen (PCNA), cyclin D1 and cyclin E gene expressions in the liver of aging rats. Methods: A recipe for replenishing qi and a recipe for activating blood were administered to aging rats respectively, and the effects of the above recipes on the expressions of senescence related genes (p16, p21, PCNA, cyclin D1 and cyclin E) were examined by RTPCR and Western blotting methods. Results: The expressions of p16, p21 and cyclin D1 mRNAs and proteins in the liver of the untreated aging rats were upregulated, while the expressions of PCNA and cyclin E mRNAs and proteins decreased. As compared with the untreated aging rats, both recipes could downregulate the expressions of cyclin D1 mRNA and protein and upregulate the expressions of cyclin E mRNA and protein, but had no obvious effects on the expressions of mRNAs and proteins of p16, p21 and PCNA. Conclusion: Recipes for replenishing qi and activating blood can improve the liver cell proliferation of aging rats via downregulating the expressions of cyclin D1 mRNA and protein and upregulating the expressions of cyclin E mRNA and protein.