International Immunology, Vol. 11, No. 5, 777-786,
May 1999
© 1999 Japanese Society for Immunology
T cell activation-associated epitopes of CD147 in regulation of the T cell response, and their definition by antibody affinity and antigen density
ern
1,2
ej
í1
Institute of ImmunologyVienna International Research Cooperation Center at NFI, University of Vienna, Brunner Strasse 59, 1235 Vienna, Austria
1 Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, 142 20 Prague 4, Czech Republic
2 Faculty of Sciences, Charles University, 142 20 Prague 4, Czech Republic
3 Institute of Molecular Pathology, 1030 Vienna, Austria
Correspondence to: H. Stockinger
CD147 is a broadly expressed cell surface glycoprotein of the Ig superfamily whose expression is up-regulated upon T cell activation. In order to elucidate a possible role of CD147 in T cell biology, we established 15 specific mAb. Seven distinct epitopes were defined by the mAb panel. Most of the mAb bound only to phytohemagglutinin (PHA)-activated but not resting T cells. We demonstrate that this was not because of true expression of activation-dependent neoepitopes but rather due to bivalent binding of the relatively low-affinity mAb (affinity constant KA values between 2.25 x 108 and 7 x 109 M1) to the more densely expressed and/or more clustered CD147 molecules on the activated T cells. In contrast, the mAb with higher affinity (KA > 7 x 109 M1) could stably bind in a monovalent fashion even to the relatively low dense CD147 molecules on resting T cells. This model might more generally explain the nature of `activation epitopes' described previously in other leukocyte surface molecules. Finally, we provide evidence that induction of ordered dimerization of CD147 by a mAb directed to a unique epitope results in strong inhibition of CD3-mediated T cell activation.
Keywords: antibodies, cell surface molecules, human, T lymphocytes, signal transduction
The first two authors contributed equally to this work
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