PPARA and metabolic dysfunction-associated steatohepatitis: Kang et al. (2022) and Du et al. (2022) demonstrated that NASH was dramatically mitigated after using human umbilical cord MSCs-EXOs with the involvement of miR-24-3p/ Kelch-like ECH-associated protein 1(Keap1)/PPARα and nuclear factor erythroid 2-related factor 2 (Nrf2)/NADPH quinone oxidoreductase1 pathways.