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1996-03-09
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Document 0176
DOCN M9650176
TI CD45RO expression on bovine T cells: relation to biological function.
DT 9605
AU Bembridge GP; MacHugh ND; McKeever D; Awino E; Sopp P; Collins RA;
Gelder KI; Howard CJ; Institute for Animal Health, Compton Laboratory,
UK.
SO Immunology. 1995 Dec;86(4):537-44. Unique Identifier : AIDSLINE
MED/96165029
AB The 180,000 MW isoform of CD45 (CD45RO) has been identified in cattle
with a novel monoclonal antibody (mAb) (IL-A116). This has allowed a
more precise analysis of T-cell function in relation to CD45 isoform
expression. Within the CD4+ and CD8+ T-cell populations, CD45RO+ and
CD45RO- subsets were evident. Most CD4+ and CD8+ T cells that expressed
the CD45RO isoform did not express the 220,000 and 205,000 MW isoforms
recognized by mAb CC76. In contrast, the WC1+, CD2-, CD4-, CD8-, gamma
delta T-cell receptor (TCR)+ T cells in bovine peripheral blood
mononuclear cells (PBMC) were all CD45RO+. Monocytes and granulocytes
were CD45RO+ but B cells were CD45RO-. Sorting experiments with CD4+ T
cells from an immunized calf demonstrated that proliferative responses
to ovalbumin (OVA) were entirely within the CD45RO+ subset. Following
stimulation with concanavalin A (Con A) the CD45RO- subset of CD4+ T
cells produced transcripts for interleukin-2 (IL-2) but not IL-4 or
interferon-gamma (IFN-gamma), while the CD45RO+ subset produced mRNA for
IL-2, IL-4 and IFN-gamma. Biologically active IL-2 was present in
supernatants from both CD45RO+ and CD45RO-, CD4+ T cells, and IFN-gamma
protein was identified by ELISA in supernatants from the CD45RO+ subset,
confirming the production of cytokines implied by polymerase chain
reaction (PCR). In contrast, sorting experiments with CD8+ T cells from
animals immune to the protozoan parasite Theileria parva revealed
substantial numbers of cytotoxic T-lymphocyte precursors in both the
CD45RO+ and CD45RO- subsets. Thus it appears that although all
antigenically primed CD4+ T cells remain CD45RO+, and expression of this
molecule consequently identifies memory cells within PBMC, antigenically
primed CD8+ T cells down-regulate CD45RO expression after activation.
DE Animal Antigens, CD45/*BLOOD Base Sequence Cattle/*IMMUNOLOGY Cell
Division/IMMUNOLOGY CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Electrophoresis, Polyacrylamide Gel
Interferon Type II/BIOSYNTHESIS Interleukins/BIOSYNTHESIS Molecular
Sequence Data Precipitin Tests Support, Non-U.S. Gov't T-Lymphocyte
Subsets/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).