Journal
IMMUNITY
Volume 18, Issue 1, Pages 131-140Publisher
CELL PRESS
DOI: 10.1016/S1074-7613(02)00508-3
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Funding
- NATIONAL CANCER INSTITUTE [Z01SC010281] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [Z01AI000926, ZIAAI000926] Funding Source: NIH RePORTER
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T cells expand without intentional antigen stimulation when transferred into adult lymphopenic environments. In this study, we show that the physiologic lymphopenic environment existing in neonatal mice also supports CD4 T cell proliferation. Strikingly, naive CD4 T cells that proliferate within neonates acquire the phenotypic and functional characteristics of memory cells. Such proliferation is inhibited by the presence of both memory and naive CD4 T cells, is enhanced by 3-day thymectomy, is independent of IL-7, and requires a class If MHC-TCR interaction and a CD28mediated signal. CD44(bright) CD4 T cells in neonates have a wide repertoire as judged by the distribution of VP expression. Thus, lymphopenia-induced T cell proliferation is a physiologic process that occurs during the early postnatal period.
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