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- W1956736834 abstract "Lymphotoxin (LT) is a cytokine that orchestrates lymphoid neogenesis and formation of germinal center reactions. LT exists as a membrane heterotrimer of alpha and beta subunits and is secreted as a homotrimer, LTalpha3. Using LTbetaR.Fc, expression of LTalphabeta on CD4 T cell subsets was investigated in a TCR transgenic model. LTalphabeta was evident 24-72 h after activation of naive T cells with specific Ag, and declined thereafter. Early expression was independent of IFN-gamma and IL-12, however, IL-12 prolonged expression. LTalphabeta was reinduced within 2-4 h after Ag restimulation, but declined by 24 h regardless of IL-12 or IFN-gamma priming. Exposure of naive T cells to IL-4 did not affect early LTalphabeta expression at 24 h, but resulted in subsequent down-regulation. IL-4-differentiated Th2 effectors did not re-express LTalphabeta, and LTalphabeta was transiently found on Th1 clones but not Th2 clones. LTalpha3 and TNF were immunoprecipitated from supernatants and lysates of IL-12 primed cells but not IL-4 primed cells. These studies demonstrate that LTalphabeta is expressed by activated naive CD4 cells, unpolarized IL-2-secreting effectors, and Th1 effectors. In contrast, loss of surface LTalphabeta and a lack of LTalpha3 and TNF secretion is associated with prior exposure to IL-4 and a Th2 phenotype." @default.
- W1956736834 created "2016-06-24" @default.
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- W1956736834 date "1999-02-01" @default.
- W1956736834 modified "2023-09-23" @default.
- W1956736834 title "Lymphotoxin alphabeta is expressed on recently activated naive and Th1-like CD4 cells but is down-regulated by IL-4 during Th2 differentiation." @default.
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