MLKL Protein Reshapes Stem Cell Aging

Researchers from St. Jude Children s Research Hospital and The University of Tokyo, led by Dr. Masayuki Yamashita, discovered an unexpected role for the protein MLKL in hematopoietic stem cell (HSC) aging. Traditionally associated with programmed cell death (necroptosis), MLKL's activation in HSCs under stress does not cause cell death but instead damages mitochondria, leading to features of aging like reduced self-renewal and imbalanced blood cell production. Inactivating MLKL significantly reduced these harmful effects, preserving HSC function. This finding, published in Nature Communications, suggests new therapeutic targets for preserving HSC function and improving health outcomes for patients undergoing treatments like chemotherapy, radiation, or transplantation.