WNK2 and chronic obstructive pulmonary disease: The results indicated that peiminine (PEI) target epidermal growth factor receptor (EGFR) prevented the exacerbation of COPD by inhibiting the EGFR signaling pathway, and ursolic acid (UA) can alleviate inflammation disorders via inhibition of CASP3 on mitogen-activated protein kinase (MAPK) signaling pathway.