Abstract
CTLA-4, expressed mainly on activated T cells, helps maintain, through its inhibitory function, immune-system homeostasis. Polymorphisms in the CTLA-4 gene (CTLA4) are known to be important in several autoimmune diseases, including multiple sclerosis (MS). Here, we have performed genotyping for CTLA4 polymorphisms, and investigated expression by peripheral blood mononuclear cells of CTLA-4 mRNA and protein, in patients with MS and myasthenia gravis and in healthy controls. Expression levels for mRNA and protein were similar in the patient and control groups; however, there was a clear relationship between genotype and CTLA-4 expression. Specifically, individuals carrying thymine at position −318 of the CTLA4 promoter (T−318) and homozygous for adenine at position 49 in exon 1 showed significantly increased expression both of cell-surface CTLA-4 after cellular stimulation and of CTLA-4 mRNA in non-stimulated cells. The association was seen most clearly for unsorted CD3+ cells and was absent in the CD8+ subset. The T−318 allele has been shown to be negatively associated with susceptibility to MS in an earlier study by our group. Thus, we propose that the susceptibility-influencing role of CTLA4 in MS may be related to genotypically conditioned promoter function, whereby high gene expression may decrease the risk of disease.
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This study was supported by grants from the Swedish Medical Research Council (project numbers 11023 and 11220), the Society for the Neurologically Disabled, the Sigurd and Elsa Goljes Minne Foundation, Karolinska Institutet, the Magn. Bergvall Foundation, the Åke Wiberg Foundation, the Bibbi and Nils Jensen Foundation and the Marcus Borgström Foundation.
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Ligers, A., Teleshova, N., Masterman, T. et al. CTLA-4 gene expression is influenced by promoter and exon 1 polymorphisms . Genes Immun 2, 145–152 (2001). https://doi.org/10.1038/sj.gene.6363752
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DOI: https://doi.org/10.1038/sj.gene.6363752
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