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Definition of a lamina propria T cell responsive state. Enhanced cytokine responsiveness of T cells stimulated through the CD2 pathway.

S R Targan, R L Deem, M Liu, S Wang and A Nel
J Immunol January 15, 1995, 154 (2) 664-675;
S R Targan
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R L Deem
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M Liu
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S Wang
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A Nel
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Abstract

This study was designed to compare cytokine release in lamina propria lymphocytes (LPLs) and PBLs activated by Abs against CD3, CD2, and CD28. LPL T cells were significantly more responsive to CD2 ligation than PBL, as determined by release of IFN-gamma, IL-2, IL-4, and TNF-alpha. Moreover, CD28 co-ligation in LPLs exaggerated CD2 > CD3 dominance in cytokine induction. PHA-activated PBLs expressed more CD2 receptors than freshly isolated LPLs, but were less responsive to activation through CD2, indicating that postreceptor pathways in LPL may be adapted specifically to facilitate CD2-mediated cytokine secretion. Antiphosphotyrosine (APT) immunoblotting revealed inducible substrate phosphorylation during CD2, but not CD3, ligation in whole LPLs, as well as LPL-derived T cell lines. PBLs cocultured with an irradiated B cell line, Daudi, and IL-2 for 5 days attained a CD2-dominant cytokine-secretion pattern with identical tyrosine phosphorylation profiles as freshly isolated LPL or LPL T cell lines. PHA-activated PBLs did not produce these tyrosine phosphorylation profiles. This suggests that B lymphocytes in the lamina propria may contribute to a T cell differentiation process in which CD2, possibly by potentiation of its postreceptor pathway, becomes a prominent receptor for induction of cytokine secretion.

  • Copyright © 1995 by American Association of Immunologists
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The Journal of Immunology
Vol. 154, Issue 2
15 Jan 1995
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Definition of a lamina propria T cell responsive state. Enhanced cytokine responsiveness of T cells stimulated through the CD2 pathway.
S R Targan, R L Deem, M Liu, S Wang, A Nel
The Journal of Immunology January 15, 1995, 154 (2) 664-675;

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Definition of a lamina propria T cell responsive state. Enhanced cytokine responsiveness of T cells stimulated through the CD2 pathway.
S R Targan, R L Deem, M Liu, S Wang, A Nel
The Journal of Immunology January 15, 1995, 154 (2) 664-675;
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Print ISSN 0022-1767        Online ISSN 1550-6606