A research study published in Cell Metabolism investigates the biological mechanisms of cancer cachexia, a wasting syndrome characterized by severe muscle and adipose tissue loss. Using mouse models and human imaging, researchers discovered that while tumors increase their own metabolic activity, total energy expenditure remains stable because the body compensates by reducing energy use in the brain and kidneys. A critical finding is that tumors act as nutritional "sinks," acquiring protein and nitrogen from both dietary intake and the breakdown of host tissues. The study identifies a novel hypothalamic signaling pathway involving the S100A8/A9 complex and complement 3 (C3), which suppresses appetite despite the body’s state of starvation. By pharmacologically blocking this inflammatory pathway, the researchers were able to stimulate food intake and significantly mitigate the loss of fat and lean mass. These results suggest that targeting S100A8/A9-C3 signaling could provide a new therapeutic strategy for managing weight loss in cancer patients.

References:

• Gao L, Liu Y, Yu Y, et al. The S100A8/A9 complex promotes food intake and prevents adipose tissue loss during cancer cachexia in mice[J]. Cell Metabolism, 2026.