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Once believed to solely function as a cyclin-dependent kinase inhibitor, p27 Kip1 is now emerging as a critical mediator of autophagy, cytoskeletal dynamics, cell migration and apoptosis. During periods of metabolic stress, the subcellular location of p27 Kip1 largely dictates its function. Cytoplasmic p27 Kip1 has been found to be promote cellular resilience through autophagy and anti-apoptotic mechanisms. Nuclear p27 Kip1 , however, inhibits cell cycle progression and makes the cell susceptible to quiescence, apoptosis, and/or senescence. Cellular location of p27 Kip1 is regulated, in part, by phosphorylation by various kinases, including Akt and AMPK. Aging promotes nuclear localization of p27 Kip1 and a predisposition to senescence or apoptosis. Here, we will review the role of p27 Kip1 in healthy and aging cells with a particular emphasis on the interplay between autophagy and apoptosis.

The AMPK/p27Kip1 Pathway as a Novel Target to Promote Autophagy and Resilience in Aged Cells