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Adenosine monophosphate-activated protein kinase (AMPK) is a cellular energy sensor activated by metabolic stresses that inhibit catabolic ATP production or accelerate ATP consumption. Once activated, AMPK switches on catabolic pathways, generating ATP, while inhibiting cell growth and proliferation, thus promoting energy homeostasis. AMPK is activated by the antidiabetic drug metformin, and by many natural products including "nutraceuticals" and compounds used in traditional medicines. Most of these xenobiotics activate AMPK by inhibiting mitochondrial ATP production. AMPK activation by metabolic stress requires the upstream kinase, LKB1, whose tumor suppressor effects may be largely mediated by AMPK. However, many tumor cells appear to have developed mechanisms to reduce AMPK activation and thus escape its growth-restraining effects. A similar phenomenon occurs during viral infection. If we can establish how down-regulation occurs in tumors and virus-infected cells, there may be therapeutic avenues to reverse these effects.

Adenosine Monophosphate-Activated Protein Kinase: A Central Regulator of Metabolism with Roles in Diabetes, Cancer, and Viral Infection