cPLA2 does not participate in STS-induced apoptosis. A, annexin V-FLUOS analysis of STS-induced apoptosis of INS-1 cells in the presence of a cPLA2 inhibitor. INS-1 cells were pretreated with 10 μM MAPF before treatment with 1 μM STS. Cells were collected, labeled with an annexin V-FLUOS labeling solution, and analyzed by flow cytometry. The data represent cells stained only by annexin V-FLUOS. Data are the averages ± S.D. (n = 6). MAFP, methyl arachidonyl fluorophosphonate. B, annexin V-FLUOS analysis of STS-induced apoptosis of INS-1 cell in the presence of the iPLA2 inhibitor BEL. INS-1 cells were pretreated with 10 μM BEL before treatment with 1 μM STS. Data are the averages ± S.D. (n = 6). *, p < 0.05. C, Western blot analysis of cPLA2 expression in INS-1 and iPLA2-INS cells during STS-induced apoptosis. Both INS-1 and iPLA2-INS cells were treated with 1 μM STS and collected at the indicated times. Cell lysates were prepared and analyzed by Western blot for cPLA2 and actin.