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自噬通过 ROS-JNK/p38 MAPK 信号通路保护骨髓间充质干细胞免受棕榈酸诱导的细胞凋亡。

Autophagy protects bone marrow mesenchymal stem cells from palmitate‑induced apoptosis through the ROS‑JNK/p38 MAPK signaling pathways.

机构信息

Department of Orthopedics, The First Hospital of China Medical University, Shenyang, Liaoning 110000, P.R. China.

Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China.

出版信息

Mol Med Rep. 2018 Aug;18(2):1485-1494. doi: 10.3892/mmr.2018.9100. Epub 2018 May 30.

Abstract

In recent years, the association between saturated fatty acids (FA) and bone cells has received a high level of attention. Previous studies have shown that palmitate (PA), a common saturated FA, can cause apoptosis in bone marrow mesenchymal stem cells (BMSCs). However, whether PA can induce autophagy, an important intracellular protection mechanism that is closely associated with apoptosis, in BMSCs is still unknown; the association between autophagy and apoptosis is also unclear. The aim of the present study was to determine whether PA can induce autophagy in BMSCs. When BMSCs were treated with PA for >18 h, p62 began to accumulate, indicating that autophagic flux was impaired by prolonged exposure to PA. In addition, the proportion of apoptotic cells was increased when autophagy was inhibited by the autophagy inhibitor 3‑methyladenine. Furthermore, inducing autophagy by pretreating cells with rapamycin, a known inducer of autophagy, markedly reduced PA‑induced apoptosis, suggesting that autophagy may serve a protective role in PA‑induced apoptosis in BMSCs. PA also increased intracellular reactive oxygen species (ROS) production, which was decreased by the antioxidant N‑Acetyl‑cysteine, and promoted the activation of c‑Jun N‑terminal kinases (JNKs) and p38 mitogen‑activated protein kinase (MAPK). The addition of JNK and p38 MAPK inhibitors substantially reduced autophagy. Therefore, the results indicated that PA can induce autophagy in BMSCs and protect cells from PA‑induced apoptosis through the ROS‑JNK/p38 MAPK signaling pathways. These results may improve the general understanding of the mechanisms through which BMSCs adapt to PA‑induced apoptosis. The present study also provides a novel approach for the prevention and treatment of PA‑induced lipotoxicity.

摘要

近年来,饱和脂肪酸(FA)与骨细胞之间的关联受到了高度关注。先前的研究表明,棕榈酸(PA),一种常见的饱和 FA,可导致骨髓间充质干细胞(BMSCs)凋亡。然而,PA 是否可以诱导与凋亡密切相关的重要细胞内保护机制自噬,在 BMSCs 中尚不清楚;自噬与凋亡之间的关系也不清楚。本研究旨在确定 PA 是否可以诱导 BMSCs 发生自噬。当 BMSCs 用 PA 处理超过 18 小时时,p62 开始积累,表明长时间暴露于 PA 会损害自噬流。此外,当自噬被自噬抑制剂 3-甲基腺嘌呤抑制时,凋亡细胞的比例增加。此外,用雷帕霉素预处理细胞诱导自噬,一种已知的自噬诱导剂,可显著减少 PA 诱导的细胞凋亡,表明自噬可能在 PA 诱导的 BMSCs 凋亡中起保护作用。PA 还增加了细胞内活性氧(ROS)的产生,抗氧化剂 N-乙酰半胱氨酸可降低 ROS 的产生,并促进 c-Jun N-末端激酶(JNK)和丝裂原活化蛋白激酶(MAPK)p38 的激活。加入 JNK 和 p38 MAPK 抑制剂可显著减少自噬。因此,这些结果表明,PA 可以诱导 BMSCs 发生自噬,并通过 ROS-JNK/p38 MAPK 信号通路保护细胞免受 PA 诱导的凋亡。这些结果可能提高对 BMSCs 适应 PA 诱导的凋亡的机制的总体理解。本研究还为预防和治疗 PA 诱导的脂毒性提供了一种新方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7acf/6072221/e6fc7bcc5c59/MMR-18-02-1485-g00.jpg

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