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J Exp Med. 1990 December 1; 172(6): 1625–1631.
PMCID: PMC2188770

Interleukin 10, a novel B cell stimulatory factor: unresponsiveness of X chromosome-linked immunodeficiency B cells

Abstract

Highly purified, small dense splenic B cells from unstimulated mice showed increased expression of class II major histocompatibility complex (MHC) antigens and enhanced viability when cultured with affinity-purified recombinant interleukin 10 (rIL-10), compared with B cells cultured in medium alone. These responses were blocked by a monoclonal antibody (mAb) specific for IL-10, but not by an isotype- matched control antibody. IL-10 did not upregulate the expression of Fc epsilon receptors (CD23) or class I MHC antigens on small dense B cells or induce their replication as monitored by [3H]thymidine incorporation. While these B cell-stimulatory properties of IL-10 are also mediated by IL-4, the two cytokines appear to act independently in these assays; anti-IL-10 antibodies blocked IL-10 but not IL-4-mediated B cell viability enhancement, and vice versa. Similarly, since IL-4 upregulates CD23 on small dense B cells, the inability of IL-10 to do so argues against its acting via endogenously generated IL-4. Finally, IL-10 did not upregulate class II MHC antigens on B cells from X chromosome-linked immunodeficiency (XID) mice, while the same cells showed normal upregulation of class II antigens in response to IL-4. This report also extends our understanding of the relationship between IL-10 and the highly homologous Epstein-Barr virus (EBV)-encoded Bam HI fragment C rightward reading frame no. 1 (BCRFI) protein. It has previously been shown that BCRFI protein exhibits the cytokine synthesis inhibitory activity of IL-10. This report indicates that BCRFI protein also enhances in vitro B cell viability, but does not upregulate class II MHC antigens on B cells. One explanation for these data is that IL-10 contains at least two functional epitopes, only one of which has been conserved by EBV.

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Selected References

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