Abstract
CD47-blocking antibody is a well-known potential antibody drug for tumor immunotherapy. However, it is unclear whether CD47-blocking antibody can protect against metabolic disorders. We report that high-fat diet (HFD)-induced obesity increases CD47 expression, while exercise downregulates it in skeletal muscle. Administration of CD47-blocking antibody in mice prevents HFD-induced weight gain and glucose intolerance, enhances exercise capacity, and improves body composition and skeletal muscle mitochondrial function. Mechanistically, the protective effects conferred by CD47-blocking antibody are mediated through activation of AMP-activated protein kinase (AMPK) in skeletal muscle. Consistently, muscle-specific CD47-knockout mice show similar metabolic improvements, indicating a direct muscle-specific role of CD47 in regulating AMPK activation in vivo. Furthermore, the CD47-blocking antibody reduces the phosphorylation of heat shock protein 90α (HSP90α) to activate AMPK in skeletal muscle. In conclusion, CD47-blocking antibody confers metabolic benefits by activating the AMPK pathway in skeletal muscle.