Figure 2

ATP-induced autophagy triggers phagosome-lysosome fusion. A. Confocal images of MDMs treated with 3 mM ATP for 30 minutes and immuno stained for intracellular LC3. B. Confocal images of live MDMs infected with GFP-BCG (green) and pre-pulsed with Lysotracker (red) to stain acidic lysosomes. Cells were pre-incubated with anti-P2X7 (3 μg/ml) or wortmannin (100 nM) for 1 hr and then treated with 3 mM ATP for 30 minutes. Note scale bars = 10 um. C. Graph showing the percentage of Lysotracker positive, GFP-BCG containing phagosomes. Histogram shows means ± s.e.m. (n = 25–60 phagosomes). *** = P < 0.01.