TGFB1 and asthma: In BALF, Th2-related cytokines IL-4, IL-5, and IL-6; Th17-related cytokines IL-17; and Treg-related IL-10 and TGF-β were significantly higher in the asthma group than in the control group, while Th1-type-related IFN-γ showed no difference (Fig. 1C).