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Purified lymphocyte function-associated antigen-3 (LFA-3) activates human thymocytes via the CD2 pathway.

S M Denning, M L Dustin, T A Springer, K H Singer and B F Haynes
J Immunol November 1, 1988, 141 (9) 2980-2985;
S M Denning
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M L Dustin
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T A Springer
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K H Singer
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B F Haynes
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Abstract

Defining the cellular and molecular mechanisms of interaction of developing thymocytes with nonlymphoid cells of the thymic microenvironment is critical for understanding normal thymus function. We have previously shown that the CD2/LFA-3 adhesion pathway is important in the interaction of thymocytes with a variety of LFA-3+ nonlymphoid thymic microenvironment cell types. Moreover, T cell activation via the CD2 (alternative, Ag independent) pathway is considered an important mechanism for intrathymic T cell proliferation. To study the relevance of CD2/LFA-3 interactions to human thymocyte activation, we have used purified LFA-3 Ag in several in vitro assays of thymocyte proliferation. Whereas LFA-3 Ag alone did not induce thymocyte proliferation, LFA-3 Ag in combination with the anti-CD2 antibody, CD2.1, and rIL-2 induced marked thymocyte proliferation. Additionally, the anti-CD28 antibody, Kolt2, could substitute for rIL-2, resulting in thymocyte activation induced by LFA-3 Ag in combination with antibodies CD2.1 and Kolt2. In both triggering systems, LFA-3 induced thymocyte activation was dependent upon the concentration of LFA-3 Ag. LFA-3 Ag-dependent thymocyte activation was directed primarily toward CD1-, mature thymocytes. Finally, intact SRBC that express the sheep homolog of LFA-3, T11TS, in combination with antibody CD2.1 and rIL-2 could also induce thymocyte activation. These data suggest that interaction of LFA-3 molecules with thymocyte CD2 molecules may provide a component of the stimulus for normal intrathymic thymocyte activation leading to thymocyte proliferation.

  • Copyright © 1988 by American Association of Immunologists

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The Journal of Immunology
Vol. 141, Issue 9
1 Nov 1988
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Purified lymphocyte function-associated antigen-3 (LFA-3) activates human thymocytes via the CD2 pathway.
S M Denning, M L Dustin, T A Springer, K H Singer, B F Haynes
The Journal of Immunology November 1, 1988, 141 (9) 2980-2985;

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Purified lymphocyte function-associated antigen-3 (LFA-3) activates human thymocytes via the CD2 pathway.
S M Denning, M L Dustin, T A Springer, K H Singer, B F Haynes
The Journal of Immunology November 1, 1988, 141 (9) 2980-2985;
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Print ISSN 0022-1767        Online ISSN 1550-6606