Dou Yuyu et al. used Litsea pungens Hemsl and Lonicerae Japonicae Caulis in asthma model mice based on the experimental research of Lan huangqi, and found that the drug could reduce the levels of IGF-β1, IL-4, IL-13, VEGF, PDGF and the expression levels of related proteins Cyclin D1 and ERK1/2, thereby inhibiting the proliferation of airway smooth muscle cells and achieving anti-inflammatory effects (Dou et al., 2021). Here, IL4 is linked to asthma.