Effects of proton (1.5 Gy) irradiation on the mRNA expression of FAS, CSF1, IL8, IL1B, CXCL10, FGF2, PDGFB and MCP1 in A549 cells in mono- (hatched columns) or in co-culture (filled columns) configurations. Total RNA was extracted 24h after irradiation and mRNA levels were quantified by RT-qPCR. Results are presented in induction fold as means ± 1 S.D. (n = 3) by comparison with non-irradiated cells in monoculture (CTL A549). * = irradiated cells. Repeated measures one-way ANOVA and Tukey post-test: comparison with monoculture controls: $ p < 0.05; $$ p < 0.01. ns: nonsignificant.