Abstract
MRLlpr mice develop spontaneous systemic autoimmunity with many hallmarks of the human disease systemic lupus erythematosus. Although a variety of genes have been implicated in this model, disease pathogenesis is still poorly understood. In an effort to identify novel genes and pathways, we performed genome-wide mRNA expression analysis in the spleens and kidneys of MRLlpr mice throughout the disease course. Samples were collected from cohorts of C57BL/6, MRL+/+ and MRLlpr mice, and profiled by flow cytometry and gene expression microarrays. Serum autoantibodies and renal pathology were studied in parallel. We identified 236 genes in MRLlpr spleen that showed significant threefold or greater changes in expression between 6 and 20 weeks. Of interest, a number of interferon-responsive genes were expressed early, and remained dysregulated throughout the disease course. Many chemokines, cell surface proteins, transcription factors and cytokines, including IFN-gamma, also showed altered expression as disease progressed. Analysis of kidneys indicated the presence of severe inflammation that coincided with evidence for changes in kidney function and elevated expression of IFN-inducible genes, complement components and antigen presentation genes. These data provide a unique genomic view of the progression to fatal autoimmunity in MRLlpr mice, and provide new candidate genes and pathways to explore.
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Acknowledgements
We thank A Becker, J Plumb-Smith, W Ortmann, and K Espe for assistance with the microarray experiments. We also like to thank Z Tu for technical support in data analysis, and Greg Veltri and J Peller for assistance in cell sorting. This work was carried out in part using resources at the University of Minnesota Supercomputing Institute.
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Supplementary Information accompanies the paper on Genes and Immunity's website (http://www.nature.com/gene).
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Liu, J., Karypis, G., Hippen, K. et al. Genomic view of systemic autoimmunity in MRLlpr mice. Genes Immun 7, 156–168 (2006). https://doi.org/10.1038/sj.gene.6364286
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DOI: https://doi.org/10.1038/sj.gene.6364286
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