期刊
JOURNAL OF CELL SCIENCE
卷 129, 期 4, 页码 774-787出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.170589
关键词
Hic-5; MRTF-A; Mechanotransduction; Myofibroblast; Fibrosis; Wound healing
类别
资金
- National Institutes of Health General Medical Sciences [056442]
- American Recovery and Reinvestment Act (ARRA)
- Albany Medical College Bridge Funding Program
- Canadian Institutes of Health Research [210820, 286920, 286720, 497202]
- CIHR [1004005, 413783]
- Natural Sciences and Engineering Research Council of Canada [1004005, 413783]
- Canada Foundation for Innovation and Ontario Research Fund [26653]
- National Heart, Lung, and Blood Institute, National Institutes of Health [R01HL109605]
How mechanical cues from the extracellular environment are translated biochemically to modulate the effects of TGF-beta on myofibroblast differentiation remains a crucial area of investigation. We report here that the focal adhesion protein, Hic-5 (also known as TGFB1I1), is required for the mechanically dependent generation of stress fibers in response to TGF-beta. Successful generation of stress fibers promotes the nuclear localization of the transcriptional co-factor MRTF-A (also known as MKL1), and this correlates with the mechanically dependent induction of a smooth muscle actin (alpha-SMA) and Hic-5 in response to TGF-beta. As a consequence of regulating stress fiber assembly, Hic-5 is required for the nuclear accumulation of MRTF-A and the induction of a-SMA as well as cellular contractility, suggesting a crucial role for Hic-5 in myofibroblast differentiation. Indeed, the expression of Hic-5 was transient in acute wounds and persistent in pathogenic scars, and Hic-5 colocalized with alpha-SMA expression in vivo. Taken together, these data suggest that a mechanically dependent feed-forward loop, elaborated by the reciprocal regulation of MRTF-A localization by Hic-5 and Hic-5 expression by MRTF-A, plays a crucial role in myofibroblast differentiation in response to TGF-beta.
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