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• W2110496436 endingPage "3214" @default.
• W2110496436 startingPage "3209" @default.
• W2110496436 abstract "We show in this study that B cell activation following high avidity ligation of IgM or coligation of membrane Ig with CD19 elicits similar levels of Ca(2+) flux using different mechanisms. Each form of activation requires the function of Vav and PI3K. However, Vav regulates Ca(2+) flux independently of PI3K following anti-IgM cross-linking. By contrast, Vav function is essential for PI3K activation following membrane Ig (mIg)/CD19 coligation. Inhibition of PI3K revealed anti-IgM-stimulated Ca(2+) flux has a PI3K-independent component, while Ca(2+) flux following mIg/CD19 coligation is totally PI3K dependent. The p85alpha and p110delta subunits of PI3K both participate in anti-IgM and mIg/CD19 coligation-induced Ca(2+) flux, although the defects are not as severe as observed after pharmacological inhibition. This may reflect the recruitment of additional PI3K subunits, as we found that p110alpha becomes associated with CD19 upon B cell activation. These data show that the nature of the Ag encountered by B cells determines the contribution of Vav proteins to PI3K activation. Our results indicate that the strong signals delivered by multivalent cross-linking agents activate B cells in a qualitatively different manner from those triggered by coreceptor recruitment." @default.
• W2110496436 created "2016-06-24" @default.
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• W2110496436 date "2004-09-01" @default.
• W2110496436 modified "2023-10-16" @default.
• W2110496436 title "Vav-Dependent and Vav-Independent Phosphatidylinositol 3-Kinase Activation in Murine B Cells Determined by the Nature of the Stimulus" @default.
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• W2110496436 doi "https://doi.org/10.4049/jimmunol.173.5.3209" @default.
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