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- W2025730147 abstract "CD45RA+ cells have been described to be less responsive to CD3/T cell receptor (TcR)-mediated activation than CD45R0+ T cells. To analyze the underlying mechanism of the differential responses we compared CD3/TcR-triggered tyrosine phosphorylation in the two subsets and studied the role of co-stimulatory signals provided either by accessory cells or pharmacologic activation of protein kinase C by phorbol ester. Stimulation of purified CD45RA+ and CD45R0+ T cells with CD3/TcR antibodies induced similar patterns and intensities of tyrosine phosphorylation in the two subsets, but no proliferation. If accessory cells were used as the source of co-stimulatory signals, strong expression of the 55-kDa chain of the interleukin-2 (IL-2) receptor (CD25), significant IL-2 production and vigorous proliferation were observed in CD45R0+ cells, whereas CD45RA+ cells responded weakly. However, when CD3/TcR-mediated triggering was combined with activation of protein kinase C by phorbol ester, CD45RA+ cells responded strongly. These data indicate that the transmembrane signaling capacity of the T cell receptor expressed by CD45RA+ and CD45R0+ cells is similar and, therefore, is presumably not responsible for the differential reactivities of the two subsets. It is more likely that co-stimulatory signals determine whether CD3/TcR-initiated activation results in strong or weak responses." @default.
- W2025730147 created "2016-06-24" @default.
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- W2025730147 date "1994-06-01" @default.
- W2025730147 modified "2023-09-30" @default.
- W2025730147 title "Human CD45RA+ and CD45R0+ T cells exhibit similar CD3/T cell receptor-mediated transmembrane signaling capacities but differ in response to co-stimulatory signals" @default.
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- W2025730147 doi "https://doi.org/10.1002/eji.1830240623" @default.
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