LPS-induced bactericidal activity was attenuated after deletion of Beclin-1 by siRNA in HMrSV5 cells. After transiently transfected with negative control siRNA or Beclin-1 siRNA, the HMrSV5 cells were incubated with LPS (1.0 μg/ml) for 12 hours. (A) The left panel shows representative western blots probed with antibodies against Beclin-1 and LC3-II. The right panel shows densitometric analysis of Beclin-1 and LC3-II in the left panel; β-actin was used as a loading control. (B) After transfection, MDC-labeled autophagic vacuoles were observed. Scale bars: 20 μm. (C) Quantitation of the number of MDC-labeled autophagosomes per cell in Figure 7B. * p < 0.05 in Figure 7A and 7C (vs. control); # p < 0.05 in Figure 7A and 7C (vs. LPS). (D) Graph represents percentage of remaining E.coli at different time points in each group treated as described above. Data are mean values ± SD (n ≥3). * and ** denote p < 0.05 and p < 0.01 respectively (LPS vs. control); # denote p < 0.05 (LPS + Beclin-1 siRNA vs. LPS).