江苏地产白首乌C21甾苷对D-半乳糖衰老模型小鼠的作用研究

目的：研究江苏地产白首乌C21甾苷(CSG)对D-半乳糖(D-gal)衰老模型小鼠的影响。方法：小鼠分为正常组,模型组,CSG低、中、高剂量组(10,20,40 mg·kg-1·d-1)和维生素E(Vit E)对照组(100 mg·kg-1·d-1),除正常组外均采用D-gal 10 mg·kg-1颈背部皮下注射,试验期为56 d。检测小鼠血清、心、肝、脑组织中超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量及端粒酶活性。结果：与正常组相比,模型组小鼠血清、心、肝、脑组织SOD活性降低,含量增加,血清、心、肝端粒酶活性降低(P<0.01)；与模型组比较,3个CSG组及Vit E组小鼠血清、心、肝、脑SOD活性升高,MDA含量减少(P<0.01)；低剂量CSG组及Vit E组小鼠血清端粒酶活性有升高的趋势,但差异不显著,中、高剂量CSG组小鼠血清端粒酶活性升高(P<0.01)；3个CSG组及Vit E组均能升高小鼠心脏端粒酶活性(P<0.01)；3个CSG组及Vit E组小鼠肝及脑组织端粒酶活性无明显变化。结论：CSG能拮抗自由基损伤,提高D-gal衰老模型小鼠血清、心、肝、脑组织SOD活性,减少MDA含量,提高血清、心组织端粒酶活性。

Effect of C21 teroidal glycoside from root of Cynanchum auriculatum on D-galactose induced aging model mice

Objective: To study the effect of C₂₁ steroidal glycoside (CSG) from the root of Cynanchum auriculatum from Jiangsu on D-galactose (D-gal) induced aging model mice. Method: D-gal aging mouse model was established by cervicodorsal region subcutaneous injection with D-gal once a day for eight successive weeks. The mice in the normal control group (NCG, non-modeled) and the model control group (MCG, modeled but untreated) were treated with 1% CMC-Na.The model mice in the low, middle and high-dose CSG and Vitamin E treated groups were treated with a dose of (10, 20, 40, 100 mg·kg^-11) per day, respectively. The SOD activity, MDA content and telomerase activity in serum, heart, liver and brain tissues of mice were measured. Result: CSG could obviously increase the SOD activity and decrease the MDA level in serum, heart, liver and brain tissues in D-gal aging mice (P<0.01). There was no significant difference between three CSG treated groups and Vitamin E treated groups. In comparison of telomerase activity between MCG and the treated groups, it was shown that there was a significant increase in serum in middle and high dose group, and in heart tissues in CSG and Vit E treated groups,but was not in liver and brain tissue. Conclusion: This study demonstrates that CSG can antagonize free radical injury, increase the SOD activity and decrease the MDA content of serum, heart, liver and brain in D-gal aging mice, and increase the telomerase activity in serum and heart tissues but not in liver and brain tissue.