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• W2071799110 abstract "Supernatants from activated human T cell clones were previously shown to contain B cell-activating factor (BCAF), an activity which results in polyclonal resting B cell stimulation. In the present study, we investigate the relationship between this activity and human interleukin-4 which was also shown to act on resting B cells. The supernatant of the T cell clone TT9 contains IL-4 but anti-IL-4 antiserum does not affect the response of B cells as measured by thymidine uptake or cell volume increase. Furthermore, IL-4 induces Fc epsilon-receptor (CD23) expression on 30% of unstimulated human B cells, whereas BCAF-containing supernatants from clone P2, that do not contain detectable amounts of IL-4, promote B cell proliferation without inducing CD23 expression. Our results therefore establish that IL-4 and BCAF are distinct activities and suggest that they trigger different activation pathways in human B cells. In addition, culture of B cells with T cell supernatants for 72 hr induces a three- to fourfold increase in the expression of HLA-DR, -DP, and -DQ antigens in 50% of B cells. The addition of inhibiting concentrations of anti-IFN-gamma, LT, or IL-4 antisera to the cultures does not change these results. Finally, 30% of B cells cultured with T cell supernatants leave the G1 phase of the cell cycle and 20% reach mitosis. Taken together, our findings further support the existence of a B cell-activating factor responsible for the activation of resting human B cells." @default.
• W2071799110 created "2016-06-24" @default.
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• W2071799110 date "1990-01-01" @default.
• W2071799110 modified "2023-10-12" @default.
• W2071799110 title "Further evidence for a human B cell activating factor distinct from IL-4" @default.
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• W2071799110 doi "https://doi.org/10.1016/0008-8749(90)90059-z" @default.
• W2071799110 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2136716" @default.
• W2071799110 hasPublicationYear "1990" @default.
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