CXCL8 and chronic obstructive pulmonary disease: Fibroblasts from COPD patients were not different from S‐C at nonsenescent passage, but displayed senescence hallmarks at senescence passage: a lower senescence‐associated PDL (Figure 2a), an increased SA β‐gal staining (Figure 2b), and increased p16 and IL‐8 mRNA expression (Supporting Information Figures S1, and S2f) and increased p16 protein expression (S1), as compared to S‐C.