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. 1990 Mar;69(3):342–347.

Immunoglobulin isotype production by cycling human B lymphocytes in response to recombinant cytokines and anti-IgM.

L Flores-Romo 1, M J Millsum 1, S Gillis 1, P Stubbs 1, C Sykes 1, J Gordon 1
PMCID: PMC1385949  PMID: 2179132

Abstract

Actively cycling populations of purified human tonsilar B lymphocytes were examined for their capacity to secrete IgM, IgA, IgE and IgG of all four subclasses in direct response to recombinant cytokines; in some experiments, monoclonal antibody to IgM (anti-mu) was included in order to explore the influence of antigen receptor ligation on immunoglobulin (Ig) production. Enhanced IgM release was seen on culture of the cycling cells with either interleukin-2 (IL-2), IL-4 or interferon-alpha (IFN-alpha). IL-2 and IFN-alpha also augmented IgA production, whereas IL-4 had no effect on this isotype. IL-4 did, however, encourage the production of the IgG subclasses IgG1, IgG2 and IgG3, while IL-2 augmented IgG1 and IgG3 release and IFN-alpha increased IgG1 levels. IgG4 production, and that of IgE, failed to be perturbed by any of the cytokines assayed. Neither IL-1 alpha, IL-1 beta, IL-5 nor IFN-gamma significantly altered the profile of Ig isotype release. When confronted with anti-mu, cycling B cells demonstrated a marked suppression in IgM production. Suppression could not be overcome by the addition to culture of the normally IgM-promoting IL-4. Concomitant with the reduction in IgM levels, an increase in IgG release was observed. This was comprised of elevations in IgG1 and IgG3. Although not influencing IgA release directly, anti-mu was found to promote increased IgA production in co-culture with either IL-2 or IFN-alpha. The findings are discussed in the context of recent findings on Ig isotype control in both human and murine systems.

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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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