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- W173376959 abstract "Human peripheral blood T cells form large aggregates when cultured in the presence of antibodies to the highly sialylated protein CD43. About 25% of the cells in such cultures do not aggregate, however, although virtually all T cells express CD43. To find out if these cells constitute a distinct subpopulation of T cells, we analysed the expression of CD43 and lymphocyte function-associated antigen-1 (LFA-1) and examined the aggregation induced by CD43 monoclonal antibodies (mAb) in CD4+ and CD8+ cells and in their CD45RA+ (naive) and CD45RO+ (memory) subsets, respectively. We found that CD43-stimulated CD8+ cells aggregated more rapidly and formed larger aggregates than CD4+ cells. Furthermore, whereas CD8+CD45RO+ cells formed compact clusters after some hours of incubation, a majority (about 75%) of the CD4+CD45RA+ cells remained as singles even after overnight culture. Flow cytometry analysis showed that the patterns of expression of CD43 and of LFA-1 on the different subsets were strikingly parallel to each other. Thus, CD4+ and CD8+ memory (CD45RO+) T cells expressed higher levels of CD43 than the corresponding naive cells, suggesting that increased levels of CD43 expression are, like LFA-1 expression, a marker of primed or recently activated cells. Immunoprecipitation and sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of 125I-labelled subsets showed that CD8+ cells expressed about twice as much CD43 as CD4+ cells. In a particular donor where the mean size of the cells in the four subsets was close to equal, CD4+ memory cells showed a 1.4-fold and CD8+ memory cells a twofold increase in CD43 compared to their corresponding naive populations. The propensity of memory T cells to extravasate may be facilitated by high expression of CD43." @default.
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- W173376959 date "1996-03-01" @default.
- W173376959 modified "2023-09-24" @default.
- W173376959 title "PARALLEL PATTERN OF EXPRESSION OF CD43 AND OF LFA-1 ON THE CD45RA+ (NAIVE AND CD45RO+ (MEMORY) SUBSETS OF HUMAN CD4+ AND CD8+ CELLS. CORRELATION WITH THE AGGREGATIVE RESPONSE OF THE CELLS TO CD43 MONOCLONAL ANTIBODIES" @default.
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