An abnormal distribution of Fc gammaRIIa polymorphisms was associated with SLE in Korean patients. There was a significant decrease in the Fc gammaRIIa-H/H131 genotype and H131 allelic frequency in SLE patients, particularly in those with nephritis. This suggests that the H131 allele confers some protection from SLE in this population.
The higher proportion of CD8+ cells which can produce IL4 in PB and in expanded CD8+ T cell lines suggests an altered pattern of CD8+ T cell differentiation in AS and in HLA-B27+ healthy individuals. This predisposition to generate IL4+CD8+ T cells may play a role in pathogenesis of spondyloarthritis.
Expansion of IL-4+ CD8+ T cells, which may include precursors of a regulatory CD8+ T cell subset, may represent a general response to chronic joint inflammation.
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