In order to further investigate dual effects of HUCMSCs via HIF-1α in the bleomycin-induced pulmonary fibrosis, we detected the expression levels of factors in the secretome of HUCMSCs in inflammatory stimulation condition (ICM-HUCMSCs) and common condition (CM-HUCMSCs) (Figure 5). Here, HIF1A is linked to pulmonary fibrosis.