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J. Biol. Chem., Vol. 277, Issue 3, 1912-1918, January 18, 2002
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From the An investigation into the role of CD45 isoforms in T
cell antigen receptor signal transduction was carried out by
transfecting CD45-negative CD4+CD8+
HPB-ALL T cells with the CD45R0, CD45RBC, and CD45RABC isoforms. Fluorescence resonance energy transfer analysis showed that the CD45R0
isoform, but not the CD45RBC or CD45RABC isoforms, was found as
homodimers and also preferentially associated with CD4 and CD8 at the
cell-surface. A comparison was therefore made of T cell antigen
receptor signaling between sub-clones expressing either CD45R0 or
CD45RBC. Under basal conditions CD4-associated p56lck
tyrosine kinase activity and cellular protein tyrosine phosphorylation levels were higher in the CD45R0+ than in the
CD45RBC+ sub-clones. Upon CD3-CD4 ligation, TCR-
Differential Association of CD45 Isoforms with CD4 and CD8
Regulates the Actions of Specific Pools of p56lck Tyrosine
Kinase in T Cell Antigen Receptor Signal Transduction*
,
,
,
,
,

Laboratory of Lymphocyte Signalling and
Development, Programme of Molecular Immunology, The Babraham Institute,
Cambridge, CB2 4AT, United Kingdom, the § Department of
Biophysics and Cell Biology, University of Debrecen, H-4012 Debrecen,
Hungary, the ¶ Department of Pathology, University of Cambridge,
Tennis Court Road, Cambridge, CB2 1QP, United Kingdom, the
Imperial Cancer Research Fund Medical Oncology Unit, St.
Bartholomews Hospital, Charterhouse Square, London, EC1M 6BQ, United
Kingdom, and ** The Edward Jenner Institute, Compton,
Newbury, Berks, RG20 7NN, United Kingdom
phosphorylation, ZAP-70 recruitment to the p21/p23 TCR-
phosphoisomers, ZAP-70 phosphorylation, as well as p56lck,
c-Cbl and Slp-76 phosphorylation, were all markedly increased in
CD45R0+ compared with CD45RBC+ cells. T cell
antigen receptor (TCR) stimulation alone also promoted c-Cbl
phosphorylation in CD45R0+ but not in CD45RBC+
cells. Our results are consistent with a model in which association of
CD45R0 with CD4 generates a more active pool of CD4-associated p56lck kinase molecules. Upon CD3-CD4 co-ligation, the
active p56lck increases the intensity of T cell antigen
receptor signal transduction coupling by promoting TCR-
chain
phosphorylation and ZAP-70 recruitment.
*
This work was supported by the Biotechnology and Biological
Sciences Research Council, by the British Council British-Hungarian Academic Research Program 069, and by the Hungarian Academy of Sciences
Grant OKTA 30399/1999.The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Senam Doe sadly died from illness since this work was carried out,
and this paper is dedicated to her memory.

To whom correspondence should be addressed. Tel.:
44-1223-496554; Fax: 44-1223-496023; E-mail:
Denis.Alexander@BBSRC.AC.UK.
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