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J Clin Invest. 2003 Oct;112(8):1211-22.

Activation of natural killer T cells in NZB/W mice induces Th1-type immune responses exacerbating lupus.

Author information

1
Division of Immunology & Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA. dzeng@coh.org

Abstract

In vivo treatment of mice with the natural killer T (NKT) cell ligand, alpha-galactosylceramide (alphaGalCer), ameliorates autoimmune diabetes and experimental autoimmune encephalomyelitis (EAE) by shifting pathogenic Th1-type immune responses to nonpathogenic Th2-type responses. In the current study, in vivo activation of NKT cells in adult NZB/W mice by multiple injections of alphaGalCer induced an abnormal Th1-type immune response as compared with the Th2-type response observed in nonautoimmune C57BL/6 mice. This resulted in decreased serum levels of IgE, increased levels of IgG2a and IgG2a anti-double-stranded DNA (anti-dsDNA) Ab's, and exacerbated lupus. Conversely, treatment of NZB/W mice with blocking anti-CD1d mAb augmented Th2-type responses, increased serum levels of IgE, decreased levels of IgG2a and IgG2a anti-dsDNA Ab's, and ameliorated lupus. While total CD4+ T cells markedly augmented in vitro IgM anti-dsDNA Ab secretion by splenic B cells, the non-CD1d-reactive (CD1d-alphaGalCer tetramer-negative) CD4+ T cells (accounting for 95% of all CD4+ T cells) failed to augment Ab secretion. The CD1d-reactive tetramer-positive CD4+ T cells augmented anti-dsDNA Ab secretion about tenfold. In conclusion, activation of NKT cells augments Th1-type immune responses and autoantibody secretion that contribute to lupus development in adult NZB/W mice, and anti-CD1d mAb might be useful for treating lupus.

PMID:
14561706
PMCID:
PMC213484
DOI:
10.1172/JCI17165
[Indexed for MEDLINE]
Free PMC Article

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