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Fig. 4. Caspase-12 is processed downstream of the apoptosome in MEFs in response to ER stress. (A) Caspase-12 processing during ER stress-induced cell death was analyzed by western blotting. MEFs (Apaf-1+/-; WT or Apaf-1-/-; KO) were treated with tunicamycin (1 µg/ml) with or without Caspase-3 specific inhibitor Ac-DNLD-CHO (100 mM) for the indicated time. Caspase-12 (C12) activation was detected by western blotting. C3, caspase-3. (B) MEFs were introduced with wild or mutated caspase-12 and analyzed for caspase-12 processing by western blotting. (C) Effect of caspase-12 overexpression to ER stress-induced cell death was analyzed by flow cytometry (Annexin V and PI staining). (D) Effect of caspase-12 overexpression on caspase-3 activation was determined by western blotting. (E) Reduced expression of caspase-12 by siRNA was confirmed by western blotting. (F) Apaf-1+/- (WT) or Apaf-1-/- (KO) MEFs with reduced caspase-12 expression (by C12 si-3 in E) were analyzed for their cell survival by flow cytometry. Shown are means ± s.d. Experiments were repeated twice with similar results.