XIAP inhibits general apoptotic triggers, in
vitro. (A) Thymocytes from
lckpr-xiap lines 1
(n = 16, P < 0.01) and 2
(n = 12, P < 0.01), and
wild-type thymocytes (5 × 106 cells/ml) were
exposed to C2 ceramide (10 μM) for the time periods indicated.
(B) Lckpr-xiap
line 1 and wild-type thymocytes (5 × 106 cells/ml)
were exposed to UV radiation (1,000 μJ/cm2)
(n = 8, P < 0.01) for the time
periods indicated. (C)
Lckpr-xiap line 1 and
wild-type thymocytes (5 × 106 cells/ml) were
treated with either anti-Fas antibody (Jo2, 5 μg/ml) in combination
with cycloheximide (30 μg/ml) (n = 24,
P < 0.01), with cycloheximide (30 μg/ml)
alone, or with anti-Fas (n = 24,
P < 0.01) alone for 12 h. (D)
Lckpr-xiap line 1 and
wild-type thymocytes (5 × 106 cells/ml) were
treated with either mouse Fas antibody (5 μg/ml)
(n = 20, P < 0.01) or human
specific anti-Fas antibody (5 μg/ml) (n = 20,
P < 0.01) for 18 h. All mice used were
between 4 and 5 weeks old.