CD19 hyperexpression augments Sle1 -induced humoral autoimmunity but not clinical nephritis

Xiaoyan Shi, Chun Xie, Sooghee Chang, Xin J. Zhou, Thomas Tedder, Chandra Mohan

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Objective. B cell hyperactivity is a common denominator in murine and human systemic lupus erythematosus. Some susceptibility genes in lupus are associated with B cell hyperactivity, but others are clearly not. While the Sle1 lupus susceptibility locus of NZM2410/NZW origin leads to chromatin-focused autoimmunity, genetically engineered overexpression of CD19 leads to "generalized" B cell hyperactivity. We undertook this study to determine the degree to which generalized B cell hyperactivity can amplify lupus pathogenesis. Methods. To elucidate the impact of generalized B cell hyperactivity on Sle1 -triggered autoimmunity, B6 mice bearing the human CD19 transgene were rendered congenic for the Sle1z genetic locus and phenotyped for serologic, cellular, and pathologic evidence of lupus. Results. As expected, B6.Sle1.hCD19Tg/Tg mice, homozygous at Sle1 and bearing the hCD19 transgene, exhibited high levels of IgM and IgG anti-DNA/ antiglomerular autoantibodies, skewed B cell subsets, and profoundly activated B and T cells. Despite exhibiting glomerular IgM, IgG, and complement deposits, these mice did not exhibit accelerated mortality or any clinical evidence of renal dysfunction. Conclusion. Generalized B cell hyperactivity may augment humoral autoimmunity, but this may not suffice to engender end-organ disease in lupus. These findings allude to the presence of an additional distal checkpoint that dissociates pathogenic autoantibody formation and renal immunoglobulin deposition from the progression to clinical nephritis in lupus.

Original languageEnglish (US)
Pages (from-to)3057-3069
Number of pages13
JournalArthritis and Rheumatism
Volume56
Issue number9
DOIs
StatePublished - Sep 2007

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Nephritis
Autoimmunity
B-Lymphocytes
Transgenes
Autoantibodies
B-Lymphocyte Subsets
Kidney
Lupus Nephritis
Genetic Loci
Systemic Lupus Erythematosus
Chromatin
Immunoglobulin M
Immunoglobulins
Immunoglobulin G
T-Lymphocytes
Mortality
DNA
Genes

ASJC Scopus subject areas

  • Immunology
  • Rheumatology

Cite this

CD19 hyperexpression augments Sle1 -induced humoral autoimmunity but not clinical nephritis. / Shi, Xiaoyan; Xie, Chun; Chang, Sooghee; Zhou, Xin J.; Tedder, Thomas; Mohan, Chandra.

In: Arthritis and Rheumatism, Vol. 56, No. 9, 09.2007, p. 3057-3069.

Research output: Contribution to journalArticle

Shi, X, Xie, C, Chang, S, Zhou, XJ, Tedder, T & Mohan, C 2007, 'CD19 hyperexpression augments Sle1 -induced humoral autoimmunity but not clinical nephritis', Arthritis and Rheumatism, vol. 56, no. 9, pp. 3057-3069. https://doi.org/10.1002/art.22825
Shi, Xiaoyan ; Xie, Chun ; Chang, Sooghee ; Zhou, Xin J. ; Tedder, Thomas ; Mohan, Chandra. / CD19 hyperexpression augments Sle1 -induced humoral autoimmunity but not clinical nephritis. In: Arthritis and Rheumatism. 2007 ; Vol. 56, No. 9. pp. 3057-3069.
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N2 - Objective. B cell hyperactivity is a common denominator in murine and human systemic lupus erythematosus. Some susceptibility genes in lupus are associated with B cell hyperactivity, but others are clearly not. While the Sle1 lupus susceptibility locus of NZM2410/NZW origin leads to chromatin-focused autoimmunity, genetically engineered overexpression of CD19 leads to "generalized" B cell hyperactivity. We undertook this study to determine the degree to which generalized B cell hyperactivity can amplify lupus pathogenesis. Methods. To elucidate the impact of generalized B cell hyperactivity on Sle1 -triggered autoimmunity, B6 mice bearing the human CD19 transgene were rendered congenic for the Sle1z genetic locus and phenotyped for serologic, cellular, and pathologic evidence of lupus. Results. As expected, B6.Sle1.hCD19Tg/Tg mice, homozygous at Sle1 and bearing the hCD19 transgene, exhibited high levels of IgM and IgG anti-DNA/ antiglomerular autoantibodies, skewed B cell subsets, and profoundly activated B and T cells. Despite exhibiting glomerular IgM, IgG, and complement deposits, these mice did not exhibit accelerated mortality or any clinical evidence of renal dysfunction. Conclusion. Generalized B cell hyperactivity may augment humoral autoimmunity, but this may not suffice to engender end-organ disease in lupus. These findings allude to the presence of an additional distal checkpoint that dissociates pathogenic autoantibody formation and renal immunoglobulin deposition from the progression to clinical nephritis in lupus.

AB - Objective. B cell hyperactivity is a common denominator in murine and human systemic lupus erythematosus. Some susceptibility genes in lupus are associated with B cell hyperactivity, but others are clearly not. While the Sle1 lupus susceptibility locus of NZM2410/NZW origin leads to chromatin-focused autoimmunity, genetically engineered overexpression of CD19 leads to "generalized" B cell hyperactivity. We undertook this study to determine the degree to which generalized B cell hyperactivity can amplify lupus pathogenesis. Methods. To elucidate the impact of generalized B cell hyperactivity on Sle1 -triggered autoimmunity, B6 mice bearing the human CD19 transgene were rendered congenic for the Sle1z genetic locus and phenotyped for serologic, cellular, and pathologic evidence of lupus. Results. As expected, B6.Sle1.hCD19Tg/Tg mice, homozygous at Sle1 and bearing the hCD19 transgene, exhibited high levels of IgM and IgG anti-DNA/ antiglomerular autoantibodies, skewed B cell subsets, and profoundly activated B and T cells. Despite exhibiting glomerular IgM, IgG, and complement deposits, these mice did not exhibit accelerated mortality or any clinical evidence of renal dysfunction. Conclusion. Generalized B cell hyperactivity may augment humoral autoimmunity, but this may not suffice to engender end-organ disease in lupus. These findings allude to the presence of an additional distal checkpoint that dissociates pathogenic autoantibody formation and renal immunoglobulin deposition from the progression to clinical nephritis in lupus.

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