Figure 4.
Deficiency of both perforin and FasL causes decreased apoptosis of donor CD8+T cells after BMT. (A) Wild-type (•) and cdd (▴) CD8+ T cells at 2 × 105/well were cultured with irradiated bm1 DCs (1 × 104/well) for 2 to 4 days. During the final 12 hours of culture, cells were pulsed with [3H] thymidine and assayed for proliferation. *P < .05 by Mann-Whitney U test. (B) Mice underwent transplantation as in Figure 1 and splenocytes were analyzed on day 10 after BMT by 2-color flow cytometry for expression of annexin and CD8+ cells. Gates were set for CD8+ cells, and the percentage of cells expressing annexin was determined. Data represent mean ± SD. wt versus cdd, *P < .05 by Mann-Whitney U test.