YAP1 and renal fibrosis: Studies have demonstrated that through using exosomes to transfer miR‐374a‐5p from mesenchymal stem cells to human renal tubular epithelial cell line (HK‐2), miR‐374a‐5p can reduce the apoptosis of HK‐2 by binding to MAPK mRNA and regulating the MAPK6/MK5/YAP axis, and finally alleviates renal fibrosis.316