CD86 (B7-2) on human B cells. A functional role in proliferation and selective differentiation into IgE- and IgG4-producing cells.

The Journal of Biological Chemistry
P JeanninJ Y Bonnefoy

Abstract

Immunoglobulin (Ig) E production by B cells requires two primary signals provided by T cells, interleukin (IL)-4 or IL-13 and CD40 ligand (CD40L). In addition, costimulatory signals, such as CD23-CD21 interaction, contribute further ensuring a selective control over this production. Recently, CD28, expressed on T cells, has been reported to be involved in this process. The CD28 ligands, CD80 (B7-1) and CD86 (B7-2), are expressed on human tonsillar B cells, and their expression is up-regulated by IL-4, IL-13, and/or an anti-CD40 monoclonal antibody (mAb). We have investigated whether signaling via the B7 molecules affects IgE synthesis. Human B cells were stimulated by IL-4 plus anti-CD40 mAb in the presence of different anti-B7 mAbs. Cross-linking of CD86 with IT2.2 potentiated IgE and IgG4 production and epsilon transcripts expression. The production of the other isotypes was not modulated. Conversely, the anti-CD80 and the other anti-CD86 mAbs tested had no effect. The increase of IgE and IgG4 production induced by IT2.2 was accompanied by an increase in proliferation, in cell surface density of CD23, and in CD23 binding to CD21-expressing B cells. In contrast, the expression of other B cell surface molecules such as CD11a, C...Continue Reading

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