Journal
CELLULAR SIGNALLING
Volume 22, Issue 11, Pages 1790-1797Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2010.07.008
Keywords
AMP-activated protein kinase; TGF-beta; Epithelial-to-mesenchymal transition; Apoptosis
Categories
Funding
- Natural Science Foundation of China [30730023, 30721065, 30623003]
- National Basic Research Program of China [2007CB947900]
- Shanghai Science Committee [06DZ22032, 088014199]
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AMP-activated protein kinase (AMPK) is a serine/threonine protein kinase which has been implicated in the regulation of cellular energy homeostasis. Relatively very little is known about its role in other cellular processes. We observed that AMPK-alpha can be activated by transforming growth factor-beta 1 (TGF-beta 1) in mouse hepatocytes. Inhibition of AMPK by Compound C, a selective AMPK-alpha inhibitor, inhibited TGF-beta 1-induced apoptosis and EMT in hepatocytes. In addition, overexpression of a dominant-negative form of AMPK-alpha subunit also suppressed TGF-beta 1-induced EMT and apoptosis in AML12 cells. Furthermore, inhibition of AMPK suppressed TGF-beta 1-induced Smad3 transcriptional activity. This study indicates that AMPK is able to modulate Smad3 transcriptional activity, which plays an important role in TGF-beta 1-induced apoptosis and EMT. (C) 2010 Elsevier Inc. All rights reserved.
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