L-Serine was found to inhibit the inflammation levels caused by A. baumannii by upregulating SIRT1 in Beas 2B cells. (A and B) L-Serine regulates NLRP3, ASC, and caspase-1 at both protein and mRNA levels. (C) The effect of L-serine on mRNA levels of IL-18 and IL-1β induced by A. baumannii. (D) The effect of L-serine on the production of IL-18 and IL-1β caused by A. baumannii was measured by ELISA. *,#,▲P < 0.05. **,##,▲▲P < 0.01. ***,###,▲▲▲P < 0.001. *Compared with the control group. #Compared with the A. baumannii group. ▲Compared with the A. baumannii+L-serine group.