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Pharmacological correction of obesity-induced autophagy arrest using calcium channel blockers.


ABSTRACT: Autophagy deregulation during obesity contributes to the pathogenesis of diverse metabolic disorders. However, without understanding the molecular mechanism of obesity interference in autophagy, development of therapeutic strategies for correcting such defects in obese individuals is challenging. Here we show that a chronic increase of the cytosolic calcium concentration in hepatocytes during obesity and lipotoxicity attenuates autophagic flux by preventing the fusion between autophagosomes and lysosomes. As a pharmacological approach to restore cytosolic calcium homeostasis in vivo, we administered the clinically approved calcium channel blocker verapamil to obese mice. Such treatment successfully increases autophagosome-lysosome fusion in liver, preventing accumulation of protein inclusions and lipid droplets and suppressing inflammation and insulin resistance. As calcium channel blockers have been safely used in clinics for the treatment of hypertension for more than 30 years, our results suggest they may be a safe therapeutic option for restoring autophagic flux and treating metabolic pathologies in obese patients.

SUBMITTER: Park HW 

PROVIDER: S-EPMC4157315 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature

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Pharmacological correction of obesity-induced autophagy arrest using calcium channel blockers.

Park Hwan-Woo HW   Park Haeli H   Semple Ian A IA   Jang Insook I   Ro Seung-Hyun SH   Kim Myungjin M   Cazares Victor A VA   Stuenkel Edward L EL   Kim Jung-Jae JJ   Kim Jeong Sig JS   Lee Jun Hee JH  

Nature communications 20140905


Autophagy deregulation during obesity contributes to the pathogenesis of diverse metabolic disorders. However, without understanding the molecular mechanism of obesity interference in autophagy, development of therapeutic strategies for correcting such defects in obese individuals is challenging. Here we show that a chronic increase of the cytosolic calcium concentration in hepatocytes during obesity and lipotoxicity attenuates autophagic flux by preventing the fusion between autophagosomes and  ...[more]

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