Fig. 2.
IL-7 treatment induces proliferation of CD45RA+CD45RO− naive cells without CD45RO up-regulation.
(A) CD45RA+CD45RO− T cells were isolated and left untreated or treated with IL-7 (1000 U/mL), IL-2 (100 U/mL), or PHA (4 μg/mL). PHA cultures were also treated with IL-2 (20 U/mL). The cells were analyzed by flow cytometry at day 0, 2, 4, and 6 for CD45RA+CD45RO− expression. Values shown represent at least 6 donors. (B) CD45RA+CD45RO− T cells were isolated and left untreated or were treated with IL-7 (1000 U/mL) or PHA (4 μg/mL). On day 6, the cells were pulsed with 1 μCi3[H]thymidine and cultured for an additional 6 hours prior to analysis by means of a scintillation counter. Values are the median of 5 different donors run in triplicate.