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M9550125.TXT
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1995-03-04
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Document 0125
DOCN M9550125
TI Effects of irradiation, glucocorticoid and FK506 on cell-surface antigen
expression by rat thymocytes: a three-colour flow cytofluorometric
analysis.
DT 9505
AU Tsuchida M; Konishi M; Takai K; Naito K; Fujikura Y; Fukumoto T;
Department of Urology, Yamaguchi University School of Medicine,; Japan.
SO Immunology. 1994 Nov;83(3):469-75. Unique Identifier : AIDSLINE
MED/95137679
AB The expression of T-cell antigen receptor (TCR) alpha beta was
investigated in rat CD4- CD8- thymocytes during thymic reconstitution
after the exposure of animals to irradiation or glucocorticoid. The
effect of the immunosuppressant FK506 on the expression of TCR alpha
beta in rat CD4- CD8- thymocytes was also examined. The percentage of
CD4- CD8- thymocytes constituted 2.6% of total thymocytes and that of
CD4- CD8- TCR alpha beta high cells constituted 12.6% of CD4- CD8-
thymocytes in normal adult Lewis rats. The percentage of CD4- CD8- TCR
alpha beta high cells increased during thymic reconstitution after
irradiation, and maximally constituted 28.6% of CD4- CD8- thymocytes on
day 7. Similar results were obtained during thymic reconstitution after
glucocorticoid treatment. In contrast, continuous treatment with FK506
for 7 days markedly decreased not only the percentages of CD4+ CD8- TCR
alpha beta high and CD4- CD8+ TCR alpha beta high thymocytes, but also
that of CD4- CD8- TCR alpha beta high thymocytes. These results indicate
that rat CD4- CD8- thymocytes contain a subpopulation of mature (TCR
alpha beta high) cells. The possible implications of the existence of
this subpopulation with regard to thymocyte differentiation and
maturation are discussed.
DE Animal CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Dexamethasone/PHARMACOLOGY Flow Cytometry
FK-506/*PHARMACOLOGY Male Rats Rats, Inbred Lew Receptors, Antigen,
T-Cell, alpha-beta/*IMMUNOLOGY Thymus Gland/CYTOLOGY/DRUG
EFFECTS/*IMMUNOLOGY/RADIATION EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).