Adipocyte CAMK2 deficiency improves obesity-associated glucose intolerance.

Wen Dai, Mayank Choubey, Sonal Patel, Harold A Singer, Lale Ozcan

Molecular metabolism 2021 Nov

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Obesity-related adipose tissue dysfunction has been linked to the development of insulin resistance, type 2 diabetes, and cardiovascular disease. Impaired calcium homeostasis is associated with altered adipose tissue metabolism; however, the molecular mechanisms that link disrupted calcium signaling to metabolic regulation are largely unknown. Here, we investigated the contribution of a calcium-sensing enzyme, calcium/calmodulin-dependent protein kinase II (CAMK2), to adipocyte function, obesity-associated insulin resistance, and glucose intolerance. To determine the impact of adipocyte CAMK2 deficiency on metabolic regulation, we generated a conditional knockout mouse model and acutely deleted CAMK2 in mature adipocytes. We further used in vitro differentiated adipocytes to dissect the mechanisms by which CAMK2 regulates adipocyte function. CAMK2 activity was increased in obese adipose tissue, and depletion of adipocyte CAMK2 in adult mice improved glucose intolerance and insulin resistance without an effect on body weight. Mechanistically, we found that activation of CAMK2 disrupted adipocyte insulin signaling and lowered the amount of insulin receptor. Further, our results revealed that CAMK2 contributed to adipocyte lipolysis, tumor necrosis factor alpha (TNFα)-induced inflammation, and insulin resistance. These results identify a new link between adipocyte CAMK2 activity, metabolic regulation, and whole-body glucose homeostasis. Copyright © 2021 The Author(s). Published by Elsevier GmbH.. All rights reserved.

Citation

Wen Dai, Mayank Choubey, Sonal Patel, Harold A Singer, Lale Ozcan. Adipocyte CAMK2 deficiency improves obesity-associated glucose intolerance. Molecular metabolism. 2021 Nov;53:101300