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The Journal of Immunology, Vol 146, Issue 10 3340-3346, Copyright © 1991 by American Association of Immunologists
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YF Shi, RP Bissonnette, N Parfrey, M Szalay, RT Kubo and DR Green
Department of Immunology, University of Alberta, Edmonton, Canada.
Some thymocytes, upon activation via the TCR complex in vitro, undergo apoptotic cell death. In this report, we examine the cell death induced in the thymus after administration of anti-CD3 or anti-TCR antibodies. We found that shortly after antibody injection, cortical thymocytes undergo apoptosis as characterized by morphologic changes and DNA fragmentation. Anti-CD3 administration led to depletion of nearly all CD4+CD8+ thymocytes, and approximately 50% of CD4+CD8- thymocytes. This depletion predominantly affected cells bearing low levels of CD3, although some depletion also occurred among cells expressing intermediate and high levels. Administration of an anti-TCR antibody also induced apoptosis, but affected significantly fewer thymocytes than anti-CD3. This effect was probably not due to different binding affinities for the two antibodies, because both antibodies show similar dose response effects in an in vitro model of activation-induced apoptosis. This work demonstrates that findings on activation-induced apoptosis in vitro can be extended to the in vivo situation, and further, that the activation of cortical thymocytes, in situ, results in apoptosis and removal of the activated cells. The possible relationships between this activation-induced cell death in immature thymocytes and the process of negative selection of autoreactive T cells is discussed.
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