Scientists make old blood stem cells young again in major anti-aging breakthrough
Researchers at Mount Sinai’s Icahn School of Medicine reversed aging in mouse blood-forming stem cells by repairing lysosomal dysfunction, restoring their regenerative function and reducing inflammation. The study, published in *Cell Stem Cell*, suggests lysosomal overactivity drives stem cell decline and that targeting it could unlock anti-aging therapies for blood and immune system disorders.
Scientists at the Icahn School of Medicine at Mount Sinai have achieved a breakthrough in anti-aging research by restoring youthful function to old blood-forming stem cells in mice. The team, led by Saghi Ghaffari, discovered that aging stem cells—specifically hematopoietic stem cells (HSCs) in bone marrow—suffer from overactive and damaged lysosomes, which trigger inflammation and weaken regeneration. By using a vacuolar ATPase inhibitor to calm lysosomal overdrive, the researchers reversed these defects, enabling old stem cells to regenerate blood and immune cells effectively once again. The study, published in *Cell Stem Cell*, highlights lysosomes as critical regulators of cellular health. These structures act as recycling centers, breaking down waste and maintaining metabolic balance, but their dysfunction in aging HSCs disrupts both metabolism and epigenetic stability. The findings suggest that lysosomal dysfunction is a key driver of stem cell aging, contributing to weakened immune responses and increased cancer risks like clonal hematopoiesis, a premalignant condition linked to blood cancers and inflammation. Functional testing revealed that treated stem cells regained youthful traits, including improved mitochondrial performance, reduced inflammation, and healthier epigenetic patterns. The intervention also lowered harmful inflammatory signals that accelerate tissue damage. According to Dr. Ghaffari, the results prove that aging in stem cells is reversible, offering potential pathways for therapies targeting age-related decline in blood and immune systems. The research builds on existing knowledge that aging and smoking are the strongest risk factors for cancer, with the median diagnosis age at 67, per the National Cancer Institute. By addressing lysosomal dysfunction, this approach could pave the way for regenerative treatments to combat age-related diseases, including infections and malignancies, in older adults.
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