Cholesterol Retards Senescence in Bone Marrow Mesenchymal Stem Cells by Modulating Autophagy and ROS/p53/p21(Cip1/Waf1) Pathway.

Cholesterol Retards Senescence in Bone Marrow Mesenchymal Stem Cells by Modulating Autophagy and ROS/p53/p21(Cip1/Waf1) Pathway.
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胆固醇通过调节自噬和 ROS/p53/p21(Cip1/Waf1) 途径延缓骨髓间充质干细胞的衰老。

DOI:
10.1155/2016/7524308
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发表时间:
2016
影响因子:
--
通讯作者:
Lu Y
Lu Y
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang M;Du Y;Lu R;Shu Y;Zhao W;Li Z;Zhang Y;Liu R;Yang T;Luo S;Gao M;Zhang Y;Zhang G;Liu J;Lu Y

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在本研究中,我们证明,与第 1 代 BMSC 相比,第 3 代骨髓间充质干细胞 (BMSC) 表现出衰老相关表型,其特征是 SA-β-gal 活性增加、自噬改变、G1 细胞周期停滞增加、ROS 产生以及 p53 和 p21Cip1/Waf1 表达增加。胆固醇(CH)以剂量依赖性方式减少H2O2诱导的老化BMSCs和第3代BMSCs中SA-β-gal阳性细胞的数量。此外,CH 抑制两种细胞衰老模型中 ROS 的产生以及 p53 和 p21Cip1/Waf1 的表达,并降低第 3 代 BMSC 中处于 G1 细胞周期的 BMSC 百分比。 CH 阻止 RITA(p53 重新激活并诱导肿瘤细胞凋亡,p53 激活剂)或 3-MA(3-甲基腺嘌呤,自噬抑制剂)诱导的 SA-β-gal 阳性细胞的增加。我们的结果表明,CH 不仅是细胞膜的结构成分,而且在功能上还通过调节细胞周期、自噬和 ROS/p53/p21Cip1/Waf1 信号通路来调节细胞衰老。
In the present study, we demonstrated that bone marrow mesenchymal stem cells (BMSCs) of the 3rd passage displayed the senescence-associated phenotypes characterized with increased activity of SA-β-gal, altered autophagy, and increased G1 cell cycle arrest, ROS production, and expression of p53 and p21Cip1/Waf1 compared with BMSCs of the 1st passage. Cholesterol (CH) reduced the number of SA-β-gal positive cells in a dose-dependent manner in aging BMSCs induced by H2O2 and the 3rd passage BMSCs. Moreover, CH inhibited the production of ROS and expression of p53 and p21Cip1/Waf1 in both cellular senescence models and decreased the percentage of BMSCs in G1 cell cycle in the 3rd passage BMSCs. CH prevented the increase in SA-β-gal positive cells induced by RITA (reactivation of p53 and induction of tumor cell apoptosis, a p53 activator) or 3-MA (3-methyladenine, an autophagy inhibitor). Our results indicate that CH not only is a structural component of cell membrane but also functionally contributes to regulating cellular senescence by modulating cell cycle, autophagy, and the ROS/p53/p21Cip1/Waf1 signaling pathway.
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