Caspase-6 Controls Lipid and Energy Metabolism in Diet-Induced Obesity

While caspase-6, an executioner caspase, is known for its role in neurodegeneration and cell death, its broader physiological functions remain poorly understood. Our previous study revealed that caspase-6 drives liver injury and fibrosis in metabolic dysfunction-associate steatohepatitis.

Here, we report that caspase-6 deficiency protects against high fat diet-induced obesity. Both global and adipocyte-specific caspase-6 knockout mice exhibit increased energy expenditure, reduced adiposity and inflammation, and improved glucose metabolism. Mechanistically, caspase-6 directly cleaves peroxisome proliferator-activated receptor gamma (PPARγ) and its cofactor specificity protein 1 (SP1), thereby suppressing adipose triglyceride lipase (ATGL) expression.