Calcium/Calmodulin-Dependent Protein Kinase II Inhibitors Mitigate High-Fat Diet-Induced Obesity in Mice

Area of Science:

• Biochemistry
• Metabolic Disorders
• Cell Biology

Background:

• Calcium signaling plays a role in obesity and diabetes.
• Calcium/calmodulin-dependent protein kinase II (CaMKII) is implicated in metabolic regulation.

Purpose of the Study:

• To investigate the effects of CaMKII inhibitors on diet-induced obesity in mice.
• To explore the potential of CaMKII inhibition as an obesity treatment strategy.

Main Methods:

• Administered CaMKII inhibitors (KN-93, acremomannolipin A) to mice fed a high-fat diet (HFD).
• Assessed changes in body fat mass, adipose tissue weight, and lipid accumulation.
• Evaluated glucose tolerance in HFD-fed mice.
• Conducted in vitro studies on 3T3-L1 cells and stromal cells to assess adipogenic differentiation, proliferation, and lipid accumulation.

Main Results:

• CaMKII inhibitors significantly reduced body fat mass, adipose tissue weights, and lipid accumulation in HFD-fed mice.
• Inhibitors improved glucose intolerance in HFD-fed mice.
• In vitro, KN-93 and acremomannolipin A suppressed adipogenic differentiation, proliferation, and lipid accumulation in preadipocytes and stromal cells.

Conclusions:

• CaMKII inhibitors mitigate diet-induced obesity by suppressing adipogenic differentiation, cell proliferation, and lipid accumulation.
• CaMKII inhibition represents a potential therapeutic strategy for obesity treatment.