• SOX4 expression declines with MSC senescence, and its downregulation accelerates senescence while impairing immunosuppressive function.
• Overexpression of SOX4 in late-passage MSCs reverses senescence markers and restores their immunosuppressive capacity.
• SOX4-overexpressing MSCs show enhanced therapeutic efficacy in a mouse model of systemic lupus erythematosus.
• Targeting SOX4 could improve the quality and therapeutic potential of MSCs for autoimmune disease treatment.
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