Figure 3.
Sphingolipids inhibit T-cell proliferation with different dose responses. T cells were either left intact (□, left column) or were stimulated with 1 μg/mL plated anti-CD3 plus 1 μg/mL anti-CD28 (▪), for 3 days in the presence or absence of different concentrations of S1P, DHS1P, ceramide (CER), or sphingosine (SPH), in media supplemented with 10% serum. The incorporation of [3H]thymidine was done as in Figure 2. P values comparing T-cell proliferation in the presence of sphingolipids to the proliferation in their absence are placed on top of each column. Data are representative of 3 experiments performed. Error bars indicate means ± SD; NS, not significant.