Fig. 6

Role of autophagy in CA-mediated IL-1β inhibition in S. sonnei-infected macrophages. (A-C) J774A.1 macrophages were incubated with 40 µM CA for 4–20 h or 1 µM rapamycin for 4 h. The expression levels of LC3 (A), ATG5 (B) and p62 (C) in the cell lysates were analysed by Western blotting. (D) J774A.1 macrophages were primed for 4 h with LPS in the presence or absence of 1 mM 3-MA, followed by incubation with 40 µM CA for 0.5 h before S. sonnei infection for an additional 21 h. The detectable levels of IL-1β in the supernatants were analysed by ELISA. (E) Wild-type or LC3-knockdown J774A.1 macrophages were incubated with 40 µM CA for 20 h. The expression levels of LC3 in the cell lysates were analysed by Western blotting. (F) LPS-primed wild-type or LC3-knockdown J774A.1 macrophages were incubated with 40 µM CA for 0.5 h before S. sonnei infection for an additional 21 h. The detectable levels of IL-1β in the supernatants were analysed by ELISA. The Western blotting images are representative of separate experiments. The ELISA data are expressed as the means ± SD of three separate experiments. *p < 0.05 and ***p < 0.001 as indicated