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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Rep 2015 ; 12 (4): 599-609 Nephropedia Template TP
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AMP-activated Protein Kinase Directly Phosphorylates and Destabilizes Hedgehog Pathway Transcription Factor GLI1 in Medulloblastoma #MMPMID26190112
Li YH; Luo J; Mosley YYC; Hedrick VE; Paul LN; Chang J; Zhang G; Wang YK; Banko MR; Brunet A; Kuang S; Wu JL; Chang CJ; Scott MP; Yang JY
Cell Rep 2015[Jul]; 12 (4): 599-609 PMID26190112show ga
The Hedgehog (Hh) pathway regulates cell differentiation and proliferation during development by controlling the Gli transcription factors. Cell fate decisions and progression toward organ and tissue maturity must be coordinated and how energy sensor regulates Hh pathway is not clear. AMP-activated Protein Kinase (AMPK) is an important sensor of energy stores that controls protein synthesis and other energy-intensive processes. AMPK is directly responsive to intracellular AMP levels, inhibiting a wide range of cell activities if ATP is low and AMP is high. Thus, AMPK can affect development by influencing protein synthesis and other processes needed for growth and differentiation. Activation of AMPK reduces GLI1 protein levels and stability, thus blocking Sonic hedgehog-induced transcriptional activity. AMPK phosphorylates GLI1 at serines 102 and 408 and threonine 1074. Mutation of these three sites into alanine prevents phosphorylation by AMPK. This in turn leads to increased GLI1 protein stability, transcriptional activity, and oncogenic potency.