Adipocyte CAMK2 deficiency improves obesity-associated glucose intolerance
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Updated: Oct 27, 2025
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Published on: May 19, 2023
Wen Dai1, Mayank Choubey2, Sonal Patel2
1Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA; Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, China.
Objective:
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.
Methods:
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.
Results:
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.
Conclusions:
These results identify a new link between adipocyte CAMK2 activity, metabolic regulation, and whole-body glucose homeostasis.
Insights
Calcium/calmodulin-dependent protein kinase II (CAMK2) in fat cells contributes to obesity-related insulin resistance. Blocking CAMK2 improves glucose metabolism, revealing a new target for metabolic disorders.
Area of Science:
- Molecular Biology
- Metabolic Regulation
- Obesity Research
Background:
- Obesity-associated adipose tissue dysfunction contributes to insulin resistance, type 2 diabetes, and cardiovascular disease.
- Impaired calcium homeostasis in adipocytes is linked to altered metabolism, but molecular mechanisms remain unclear.
- Calcium/calmodulin-dependent protein kinase II (CAMK2) is a calcium-sensing enzyme implicated in cellular processes.
Purpose of the Study:
- To investigate the role of CAMK2 in adipocyte function.
- To determine CAMK2's contribution to obesity-associated insulin resistance and glucose intolerance.
Main Methods:
- Generated a conditional knockout mouse model with acute deletion of CAMK2 in mature adipocytes.
- Utilized in vitro differentiated adipocytes to dissect CAMK2 regulatory mechanisms.
- Assessed metabolic parameters, insulin signaling, lipolysis, and inflammation.
Main Results:
- CAMK2 activity was elevated in obese adipose tissue.
- Adipocyte-specific CAMK2 deficiency improved glucose intolerance and insulin resistance in adult mice.
- CAMK2 activation disrupted adipocyte insulin signaling, reduced insulin receptor levels, promoted lipolysis, and enhanced TNFα-induced inflammation.
Conclusions:
- Adipocyte CAMK2 activity is a novel contributor to metabolic dysregulation.
- Targeting CAMK2 in adipocytes may offer a therapeutic strategy for improving whole-body glucose homeostasis.
- Identified a new link between CAMK2, adipocyte function, and metabolic disease.
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