Alcohol induces TGFβ1 via downregulation of miR-1946a in murine lung fibroblast.

Alcohol induces TGFβ1 via downregulation of miR-1946a in murine lung fibroblast.
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DOI:
10.1038/s41598-020-76148-5
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发表时间:
2020-11-05
期刊:
影响因子:
4.6
通讯作者:
Sueblinvong V
Sueblinvong V
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Fan X;Mills ST;Kaalla MJ;Sueblinvong V

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过度表达转化生长因子-β1(转化生长因子β1)加剧了博莱霉素诱导的酒精喂养小鼠肺损伤后的纤维增殖。MicroRNA(MiR)-1946a被预测与转化生长因子β13‘非翻译区结合,从而抑制其转录。我们假设酒精抑制miR-1946a并诱导转化生长因子β-1。原代小鼠肺成纤维细胞(PLF)用 ± 酒精、miR-1946a模拟或抑制剂和转化生长因子β-1信号抑制物培养。对酒精处理后的MIR-1946a进行体内外分析。定量检测转化生长因子β-1的表达和转化生长因子-β-1 3‘-荧光素酶活性。我们发现酒精抑制了酒精喂养的小鼠肺和PLF中的miR-1946a。MIR-1946a抑制剂增加成纤维细胞转化生长因子β-1的表达。MIR-1946a模拟处理抑制转化生长因子β-1基因表达和转化生长因子β-1 3‘非编码区活性。MiR1946a过表达可抑制酒精诱导的PLF转化生长因子β1基因和蛋白的表达,抑制酒精诱导的转化生长因子β1和α-平滑肌肌动蛋白的蛋白表达。结论:miR-1946a通过直接与转化生长因子β1 3‘端非编码区相互作用来调控转化生长因子β1的表达。这些发现确定了酒精诱导肺内转化生长因子β1的新机制。
Exaggerated transforming growth factor-beta 1 (TGFβ1) expression worsens fibroproliferation following bleomycin-induced lung injury in alcohol-fed mice. MicroRNA (miR)-1946a is predicted to bind to the TGFβ1 3′ untranslated region (UTR), thereby inhibiting its transcription. We hypothesize that alcohol suppresses miR-1946a and induces TGFβ1. Primary murine lung fibroblasts (PLFs) were cultured ± alcohol, miR-1946a mimic or inhibitor, and TGFβ1 signaling inhibitors. miR-1946a was analyzed after alcohol treatment in vitro and in vivo. TGFβ1 expression and TGFβ1 3′UTR-luciferase activity was quantified. We showed that alcohol suppressed miR-1946a in the alcohol-fed mouse lungs and PLFs. MiR-1946a inhibitor increased TGFβ1 expression in the fibroblast. MiR-1946a mimic treatment suppressed TGFβ1 gene expression and TGFβ1 3′UTR activity. Overexpression of miR1946a inhibited alcohol-induced TGFβ1 gene and protein expression as well as alcohol-induced TGFβ1 and α-smooth muscle actin (SMA) protein expression in PLFs. In conclusion, miR-1946a modulates TGFβ1 expression through direct interaction with TGFβ1 3′UTR. These findings identify a novel mechanism by which alcohol induces TGFβ1 in the lung.
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