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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
The AMPK-FoxO3A axis as a target for cancer treatment.
Cell Cycle 2010 March 16
FoxO proteins are an evolutionarily conserved subfamily of transcription factors involved in tumor suppression, regulation of energy metabolism and development in several tissues, and are mainly regulated by phosphorylation-dependent nuclear/cytoplasmic shuttling. The transcriptional activity of FoxO3A, one of the four members of the family, is further modulated by AMPK, one of the key regulators of cellular metabolism, which basically shifts cell machinery from energy-consuming to energy-producing pathways. We recently demonstrated that the AMPK/FoxO3A energy sensor pathway is still inducible in human cancer cells in response to metabolic stress, as it becomes activated in colorectal and ovarian cancer cells in response to the inhibition of p38α. Activation of the FoxO3A transcriptional program initially induces autophagy as an attempt to retain energy to survive, whereas under persistent stress conditions it triggers autophagic cell death. In this review, we focus on the connections between AMPK and FoxO3A, describing their central role as modulators of fundamental processes such as stress resistance, cell metabolism, autophagy and cell death, and highlighting the therapeutic potential of pharmacological modulation of the AMPK-FoxO3A axis.
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