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Anergic CD8+ T Cells Can Persist and Function In Vivo

Catherine A. Blish, Stacey R. Dillon, Andrew G. Farr and Pamela J. Fink
J Immunol July 1, 1999, 163 (1) 155-164;
Catherine A. Blish
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Stacey R. Dillon
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Andrew G. Farr
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Pamela J. Fink
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Abstract

Using a mouse model system, we demonstrate that anergic CD8+ T cells can persist and retain some functional capabilities in vivo, even after the induction of tolerance. In TCR Vβ5 transgenic mice, mature CD8+Vβ5+ T cells transit through a CD8lowVβ5low deletional intermediate during tolerance induction. CD8low cells are characterized by an activated phenotype, are functionally compromised in vitro, and are slated for deletion in vivo. We now demonstrate that CD8low cells derive from a proliferative compartment, but do not divide in vivo. CD8low cells persist in vivo with a t1/2 of 3–5 days, in contrast to their in vitro t1/2 of 0.5–1 day. During this unexpectedly long in vivo life span, CD8low cells are capable of producing IFN-γ in vivo despite their inability to proliferate or to kill target cells in vitro. CD8low cells also accumulate at sites of inflammation, where they produce IFN-γ. Therefore, rather than withdrawing from the pool of functional CD8+ T cells, anergic CD8low cells retain a potential regulatory role despite losing their capacity to proliferate. The ability of anergic cells to persist and function in vivo adds another level of complexity to the process of tolerance induction in the lymphoid periphery.

  • Received December 28, 1998.
  • Accepted April 14, 1999.
  • Copyright © 1999 by The American Association of Immunologists
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The Journal of Immunology: 163 (1)
The Journal of Immunology
Vol. 163, Issue 1
1 Jul 1999
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Anergic CD8+ T Cells Can Persist and Function In Vivo
Catherine A. Blish, Stacey R. Dillon, Andrew G. Farr, Pamela J. Fink
The Journal of Immunology July 1, 1999, 163 (1) 155-164;

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Anergic CD8+ T Cells Can Persist and Function In Vivo
Catherine A. Blish, Stacey R. Dillon, Andrew G. Farr, Pamela J. Fink
The Journal of Immunology July 1, 1999, 163 (1) 155-164;
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