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. 1987 Dec;84(23):8588–8592. doi: 10.1073/pnas.84.23.8588

B-lymphocyte activation mediated by anti-immunoglobulin antibody in the absence of protein kinase C.

J J Mond 1, N Feuerstein 1, F D Finkelman 1, F Huang 1, K P Huang 1, G Dennis 1
PMCID: PMC299590  PMID: 3500475

Abstract

B-cell activation induced by crosslinking of surface immunoglobulin is known to stimulate hydrolysis of phosphatidylinositol to diacylglycerol and inositol trisphosphate. We now provide evidence that alternative pathways of activation may also be recruited during such activation. We utilized depletion of protein kinase C activity to determine whether this enzyme is required under all conditions for anti-immunoglobulin-stimulated B-cell activation. Although anti-immunoglobulin does not induce B-cell proliferation in protein kinase C-depleted cells, it stimulates an earlier event in B-cell activation as reflected by its ability to enhance the expression of major histocompatibility complex-encoded class II molecules. Furthermore, the ribonucleoside 8-mercaptoguanosine restores the ability of anti-immunoglobulin to induce B-cell proliferation in protein kinase C-depleted cells. This restoration is also demonstrated by an enhancement of synthesis of a nuclear protein that we find is increased during B-cell mitogenesis. These results indicate that B-cell activation stimulated by anti-immunoglobulin may recruit pathways in addition to the one dependent on protein kinase C.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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