Figure 4.
Selective downstream caspase processing in activated lymphocytes. (A) Caspase-6 and -7 are also processed after TCR triggering. PBMCs were stimulated (+) or not (−) with anti-CD3 antibody and IL-2 for 1–4 d, and total proteins from 106 cells were separated by SDS-PAGE and analyzed by Western blot using anti–caspase-6 or -7 antisera. The proenzymes and cleaved subunits are indicated on the right by arrows. (B) All caspases are not processed in activated cells. Day 4 unstimulated (−) or anti-CD3/IL-2 stimulated (+) PBMCs were analyzed for caspase-1, -2, or -4 processing by Western blot, as in A.