(A) Representative immunoblots demonstrating levels of CD38 in BMDMs treated with CM (control conditional media) or SASP (x-ray- or γ-IR-induced senescent cell conditioned media) from PDPs or HUVECs. (B) mRNA expression of other M1 markers, namely IL-6, IL-8, and Nos2 (inducible nitric oxide synthase), in BMDMs treated with CM or SASP from PDPs. (C) Model of SASP-induced CD38 expression in macrophages. Data are mean ± SE, *p < 0.05 vs control.