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1996-03-04
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Document 0685
DOCN M9640685
TI The extracellular domain of CD45 controls association with the CD4-T
cell receptor complex and the response to antigen-specific stimulation.
DT 9604
AU Leitenberg D; Novak TJ; Farber D; Smith BR; Bottomly K; Howard Hughes
Medical Institute, Section of Immunobiology, Yale; University School of
Medicine, New Haven, Connecticut 06510, USA.
SO J Exp Med. 1996 Jan 1;183(1):249-59. Unique Identifier : AIDSLINE
MED/96136767
AB The CD45 tyrosine phosphatase plays an important role in regulating T
lymphocyte activation, but the function of the different isoforms of
CD45 is not known. T cell transfectants have been prepared that express
individual CD45 isoforms in cells with a well-defined T cell receptor
(TCR) from the D10 T helper 2 clone. We find that cells bearing low
molecular weight CD45 isoforms are far more efficient in responding to
stimulation with peptide and antigen-presenting cells compared with
cells bearing high molecular weight CD45 isoforms. One hypothesis for
the preferential activation of cells that express low molecular weight
CD45 isoforms is that they interact with other cell surface antigens
important in TCR signaling, altering their phosphorylation status and
affecting the character of the signal transduction pathway. In this
report, using cells expressing single isoforms, we demonstrate that low
molecular weight isoforms of CD45 preferentially associate with CD4 and
the TCR complex compared with high molecular weight isoforms. The
molecular basis for this interaction was further examined using a
glycosyl phosphatidyl inositol (GPI)-linked form of CD45Null (lacking
tyrosine phosphatase domains), which preferentially associated with CD4
compared with GPI-linked CD45ABC, and cytoplasmic tail mutants of CD4,
which retained the ability to coassociate. Using this panel of
transfectants, it is clear that the interaction between CD4 and CD45
does not require the cytoplasmic domains of CD45, but is dependent on
the specific external domain of the various isoforms: low molecular
weight species were more likely to associate with the CD4-TCR complex
than the higher molecular weight isoforms, and their ability to
coassociate correlated with the magnitude of the response to specific
antigen.
DE Amino Acid Sequence *Antigen Presentation Antigens, CD4/*METABOLISM
Antigens, CD45/GENETICS/*METABOLISM Base Sequence Cell Line
Comparative Study CD4-Positive T-Lymphocytes CD8-Positive
T-Lymphocytes Flow Cytometry Immunologic Capping *Lymphocyte
Transformation Molecular Sequence Data Phenotype Phosphoric Diester
Hydrolases Protein Binding Receptors, Antigen, T-Cell/*METABOLISM
Recombinant Proteins/METABOLISM Structure-Activity Relationship
Support, Non-U.S. Gov't Transfection JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).