Cigarette smoke extract induces airway epithelial cell death via repressing PRMT6/AKT signaling.

Cigarette smoke extract induces airway epithelial cell death via repressing PRMT6/AKT signaling.
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香烟烟雾提取物通过抑制 PRMT6/AKT 信号传导诱导气道上皮细胞死亡

DOI:
10.18632/aging.202210
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发表时间:
2020-12-01
期刊:
Aging
影响因子:
--
通讯作者:
Zou C
Zou C
中科院分区:
其他
文献类型:
--
作者:
Li T;Fanning KV;Nyunoya T;Chen Y;Zou C

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慢性阻塞性肺疾病(COPD)是全球范围内严重的公共卫生威胁。香烟烟雾(CS)诱导的气道上皮细胞死亡是肺气肿(COPD的一种亚型)发病的主要途径。蛋白质精氨酸甲基转移酶6(PRMT 6)是I型PRMT,其催化组蛋白和非组蛋白蛋白内的精氨酸残基上的单甲基化和二甲基化以调节多种生命过程,例如细胞凋亡。然而,其在CS诱导的肺上皮细胞死亡中的作用尚未完全阐明。在这里,我们报告说,PRMT 6减少小鼠肺组织从香烟烟雾提取物(CSE)介导的实验性肺气肿模型和CSE治疗或香烟烟雾暴露的肺上皮细胞。PRMT 6的缺失增加了磷酸酶PTEN和PI 3 K调节亚基p85的蛋白水平,但降低了下游激酶PDK 1,导致AKT去磷酸化,随后导致肺上皮细胞死亡。PRMT 6的敲除抑制上皮存活并促进CSE介导的上皮细胞死亡,而PRMT 6蛋白的异位表达在CSE细胞模型中通过PI 3 K/AKT介导的细胞存活信号传导部分逆转上皮细胞死亡。这些发现表明PRMT 6在CS诱导的支气管上皮细胞死亡中起关键作用,其可能是对抗CS诱导的COPD中的气道细胞死亡的潜在治疗靶点。
Chronic obstructive pulmonary disease (COPD) is a severe public health threat world-wide. Cigarette smoke (CS)-induced airway epithelial cell death is a major pathway of pathogenesis in emphysema, a subtype of COPD. Protein arginine methyltransferase 6 (PRMT6) is a type I PRMT that catalyzes mono- and di-methylation on arginine residues within histone and non-histone proteins to modulate a variety of life processes, such as apoptosis. However, its role in CS-induced lung epithelial death has not been fully elucidated. Here we report that PRMT6 was decreased in mouse lung tissues from a cigarette smoke extract (CSE)-mediated experimental emphysematous model and in CSE treated or cigarette smoke exposed lung epithelial cells. Depletion of PRMT6 increased the protein levels of phosphatase PTEN and PI3K regulatory subunit p85 but decreased a downstream kinase PDK1, resulting in AKT dephosphorylation and thereafter, lung epithelial cell death. Knockout of PRMT6 inhibited epithelial survival and promoted CSE-mediated epithelial cell death, while ectopic expression of PRMT6 protein partially reversed epithelial cell death via PI3K/AKT-mediated cell survival signaling in CSE cellular models. These findings demonstrate that PRMT6 plays a crucial role in CS-induced bronchial epithelial cell death that may be a potential therapeutic target against the airway cell death in CS-induced COPD.
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