Oxidative stress activates AMPK in cultured cells primarily by increasing cellular AMP and/or ADP

Abstract

AMPK is known to be activated by oxidative stress. Addition of glucose oxidase to cells generates H 2 O 2 at a constant rate that is opposed by enzymic degradation, providing a good model for physiological oxidative stress. AMPK activation by glucose oxidase correlated with increases in cellular AMP:ATP and was greatly reduced in cells expressing an AMP‐insensitive AMPK mutant, although a small degree of activation remained. The effects of increased AMP were partly due to inhibition of Thr172 dephosphorylation. These results suggest that changes in adenine nucleotides, rather than direct oxidative modification, are the major drivers of AMPK activation during oxidative stress.

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