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Ubiquitin-like polypeptide inhibits the IgE response of lipoplysaccharide-activated B cells

Ubiquitin-like polypeptide inhibits the IgE response of lipoplysaccharide-activated B cells Monoclonal non-specific suppressor factor (MNSF), a lymphokine produced by a murine hybridoma, was originally found to inhibit the generation of lipopolysaccharide (LPS)-induced 1g-secreting cells. Most recently, we demonstrated the recombinant form of the ubiquitin-like segment (rUbi-L) of MNSFB, an isoform of MNSF, has a MNSF activity. To investigate the possible role of rUbi-L, a 8.5 kDa ubiquitin-like polypeptide, in the regulation of Ig isotype secretion, rUbi-Lwas added to purified B cell cultures stimulated with LPS plus IL-4. rUbi-L notably suppressed the IgE and IgG1 responses when added at culture initiation. In addition, rUbi-L had a strong effect on lgG3 production and a little effect on IgM production by LPS-stimulated B cells, whereas the level of other isotypes (IgGSa, lgG2b and IgA) was not affected. These findings demonstrate the isotypespecific suppression, but not pan-suppression, of Ubi-L. IFN-a and IFNy, which are also known to inhibit the IgE response, showed a synergistic effect with Ubi-L, albeit the effects of IFN-a were smaller. The action was reversed by the addition of neutralizing antibodies to these cytokines. Therefore Ubi-L, a ubiquitin-like protein, may have an important imrnunoregulatory role on the IgE response. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Immunology Oxford University Press

Ubiquitin-like polypeptide inhibits the IgE response of lipoplysaccharide-activated B cells

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References (35)

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
ISSN
0953-8178
eISSN
1460-2377
DOI
10.1093/intimm/8.11.1659
Publisher site
See Article on Publisher Site

Abstract

Monoclonal non-specific suppressor factor (MNSF), a lymphokine produced by a murine hybridoma, was originally found to inhibit the generation of lipopolysaccharide (LPS)-induced 1g-secreting cells. Most recently, we demonstrated the recombinant form of the ubiquitin-like segment (rUbi-L) of MNSFB, an isoform of MNSF, has a MNSF activity. To investigate the possible role of rUbi-L, a 8.5 kDa ubiquitin-like polypeptide, in the regulation of Ig isotype secretion, rUbi-Lwas added to purified B cell cultures stimulated with LPS plus IL-4. rUbi-L notably suppressed the IgE and IgG1 responses when added at culture initiation. In addition, rUbi-L had a strong effect on lgG3 production and a little effect on IgM production by LPS-stimulated B cells, whereas the level of other isotypes (IgGSa, lgG2b and IgA) was not affected. These findings demonstrate the isotypespecific suppression, but not pan-suppression, of Ubi-L. IFN-a and IFNy, which are also known to inhibit the IgE response, showed a synergistic effect with Ubi-L, albeit the effects of IFN-a were smaller. The action was reversed by the addition of neutralizing antibodies to these cytokines. Therefore Ubi-L, a ubiquitin-like protein, may have an important imrnunoregulatory role on the IgE response.

Journal

International ImmunologyOxford University Press

Published: Nov 1, 1996

Keywords: IgE Suppressor factor ubiquitin

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