Fig. 1.
CTCL cells proliferate only in the presence of APCs.
CTCL cells were obtained from 1- (▪) and 3-month (▨) cultures of 2 representative patients and were freed of APCs by CD2–magnetic bead enrichment. The purified CTCL cells were readded after overnight culture to γ-irradiated autologous APCs that had been CTCL cell bead-depleted. After 3 additional days of culture, only CTCL cells cocultivated with APCs proliferated, as shown by uptake of [3H]-thymidine. The results presented are the means of 5 replicate samples ± SD.