Objective To study whether Lycium barbarum glycopeptide 3 (LBGP3) affects T cell apoptosis in aged mice. Methods LBGP3 was purified with DEAE cellulose and Sephadex columns. Apoptotic "sub-G1 peak" was detected by flow cytometry and DNA ladder was resolved by agarose gel electrophoresis. Levels of IFN-γ and IL-10 were measured with specific kits and mRNA expression was detected by RT-PCR. Apoptosis-related proteins of FLIP, FasL, and Bcl-2 were determined by Western blotting. Results LBGP3 was purified from Fructus Lycii water extracts and identified as a 41 kD glycopeptide. Treatment with 200 μg/mL LBGP3 increased the apoptotic rate of T cells from aged mice and showed a similar DNA ladder pattern to that in young T cells. The reversal of apoptotic resistance was involved in down-regulating the expression of Bcl-2 and FLIP, and up-regulating the expression of FasL. Conclusion Lycium barbarum glycopeptide 3 reverses apoptotic resistance of aged T cells by modulating the expression of apoptosis-related molecules.
LONG-GUO YUAN HONG-BIN DENG LI-HuI CHEN DIAN-DONG LI AND QI-YANG HE
Objective To investigate the protective effects of putative AGEs (advanced glycation endproducts) inhibitor salidroside against aging in an accelerated mouse aging model induced by D-galactose. Methods A group of 5-month-old C57BL/6J mice were treated daily with D-galactose, D-galactose combined with salidroside, salidroside alone, and control buffer for 8 weeks. At the end of the treatment, serum AGEs levels, neurological activities, expression of glial fibrillary acidic protein (GFAP) and neurotrophin-3 (NT-3) in the cerebral cortex, as well as lymphocyte proliferation and IL-2 production were determined. Results D-galactose induced mouse aging model was developed as described before. As expected, salidroside blocked D-galactose induced increase of serum AGEs levels. It also reversed D-galactose induced aging effects in neural and immune system, as evidenced by improving motor activity, increasing memory latency time, and enhancing lymphocyte mitogenesis and interleukin-2 (IL-2) production. Furthermore, elevated expression of GFAP and NT-3 in the aged model mice was also reduced upon salidroside treatment. Conclusion Salidroside inhibits AGEs formation in vivo, which at least partially contributes to its anti-aging effect in D-galactose induced aging model.
目的:探讨益气活血中药对血管内皮细胞衰老和p53基因表达的干预作用。方法:分离人脐静脉内皮细胞(HUVEC),传代培养至第4代,血管紧张素Ⅱ(AngⅡ,10-6mol/L,48h)诱导其衰老;分为空白对照组、AngⅡ组、中药提取物组和替米沙坦组;观察各组不同时间点β-半乳糖苷酶染色、CCK-8细胞计数、细胞周期分析、p53 m RNA及蛋白表达。结果:AngⅡ组较空白对照组β-半乳糖苷酶阳性染色细胞数增加(P<0.05);CCK-8检测活细胞数减少(P<0.05);细胞大量停滞于G0/G1期,而S期和G2/M期逐渐消失(P<0.05)。中药提取物组和替米沙坦组β-半乳糖苷酶阳性染色细胞数下降(P<0.05),CCK-8活细胞数增加(P<0.05),细胞周期阻滞改善(P<0.05)。中药早期作用更加明显(P<0.05)。AngⅡ呈时间依赖性上调p53 m RNA和蛋白表达;中药提取物和替米沙坦两组p53表达均明显下调(P<0.05);中药早期作用更加明显(P<0.05)。结论:益气活血中药能够有效地延缓血管内皮细胞衰老,其机制可能与抑制p53基因表达有关。
