Fig. 4. Quantification of cytokines/chemokines secreted by PDTC-treated SAECs. Results shown the amount of G-CSF (a), GM-CSF (b), IL-6 (c) and CXCL10 (d) secreted by PDTC-treated SAECs at 48 h p.i. Results are expressed as the mean ± sd of three biological repetitions. *P < 0.05, **P < 0.01 and ***P < 0.001 (ANOVA and Bonferroni's multiple comparison test).