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The Journal of Immunology, 2002, 169: 1817-1821.
Copyright © 2002 by The American Association of Immunologists

A Reassessment of the Effect of Activated Notch1 on CD4 and CD8 T Cell Development1

B. J. Fowlkes2,* and Ellen A. Robey{dagger}

* Laboratory of Cellular and Molecular Immunology, National Institutes of Health, Bethesda, MD 20892; and {dagger} Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720

The Notch signaling pathway plays an important role in the early steps of T cell development and in the generation of T cell tumors, but its role in the CD4 vs CD8 lineage decision is controversial. Notch1 is not essential for CD4 or CD8 T cell development; however, there are suggestions that multiple Notch family members may act in a redundant fashion during thymic development. In theory, expressing a constitutively activated form of Notch in CD4+CD8+ thymocytes could provide clues about the normal role of Notch in developing CD4 and CD8 T cells. Unfortunately, two different studies of transgenic mice expressing activated forms of Notch1 (Notch1IC) led to conflicting conclusions. In this study, we re-examine the effect of the two Notch1IC transgenes on thymocyte development. We find that both Notch1IC transgenic lines display a decrease in CD4 single positive (SP) thymocytes and a corresponding increase in CD8 SP thymocytes. The enhanced development of CD8 SP thymocytes is dependent on either class I or II MHC. Thus, data from two different Notch1IC transgenic lines indicate that Notch activity promotes CD8 and inhibits CD4 SP development. We suggest that the discrepancies in previous reports of Notch1IC transgenic mice are due to differences in the propensity of the two different transgenic lines to develop tumors.




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