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S152 (CD27). A modulating disulfide-linked T cell activation antigen.

R D Bigler, Y Bushkin and N Chiorazzi
J Immunol July 1, 1988, 141 (1) 21-28;
R D Bigler
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Y Bushkin
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N Chiorazzi
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Abstract

A large subset of normal resting peripheral blood T cells express a protein at low density defined by the murine mAb S152. Reactive T cells are present in both the CD4+ and CD8+ subpopulations. This determinant, however, is not expressed on growth factor-independent T cell lines. After activation of mononuclear cells by either Con A or PHA, greater than 80% of the cells stained at a mean fluorescence intensity that was more than six times that seen on resting cells. When PWM- or mixed lymphocyte reaction-activated cultures were studied, 7 to 22% of S152+ cells stained at high intensity whereas most cells stained at the baseline low intensity. The increased fraction of S152+ cells staining at high intensity after activation paralleled both the increased percentage of anti-Tac+ and 5E9+ cells and cellular proliferation measured by thymidine incorporation. Modulation of the S152 Ag was induced when either Con A- or PHA-activated mononuclear cells were placed into secondary cultures containing S152 mAb. Expression of the S152 Ag began to decrease after 2 h and reached a minimum after 6 h. Resting T cells, however, did not appear to modulate when cultured with S152 mAb. Immunoprecipitation and gel electrophoresis analysis revealed the S152 molecule to have a mobility of 120 kDa before reduction. After reduction the molecule was shown to be composed of two 55-kDa molecules with an isoelectric point of 5 to 6 indicating that the S152 Ag is a disulfide-linked homodimer. These studies confirm that the S152 mAb reacts with the newly defined CD27 molecule. The presence of the S152 Ag on resting and activated cells, its parallel increase with the Tac and 5E9 Ag, and its ability to modulate on activated cells suggest that this molecule may play a functional role during T cell activation.

  • Copyright © 1988 by American Association of Immunologists

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The Journal of Immunology
Vol. 141, Issue 1
1 Jul 1988
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S152 (CD27). A modulating disulfide-linked T cell activation antigen.
R D Bigler, Y Bushkin, N Chiorazzi
The Journal of Immunology July 1, 1988, 141 (1) 21-28;

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S152 (CD27). A modulating disulfide-linked T cell activation antigen.
R D Bigler, Y Bushkin, N Chiorazzi
The Journal of Immunology July 1, 1988, 141 (1) 21-28;
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Print ISSN 0022-1767        Online ISSN 1550-6606