Eosinophils from both groups were observed to induce TGF-β1 gene expression in ASM cells, but the effect in the asthma group was significantly higher compared with the control group (asthma group gene overexpression: 3.50 ± 0.44–fold vs. control group gene overexpression: 2.26 ± 0.32–fold; p < 0.05) (Figure 3B). Here, TGFB1 is linked to asthma.