Figure 8

Apoptosis of THP-1 cells is delayed at 2 h post challenge by the toxigenic Sterne strain relative to the non-toxigenic Δ Sterne strain. Apoptosis was detected with TUNEL staining. The numbers on the images show counts of objects with the intensities above background relative to corresponding untreated controls and indicate the extent of apoptosis. DAPI staining shows that equal number of cells was used in all experiments.