HLA-E restricted CD8+ T cell subsets are phenotypically altered in multiple sclerosis patients

Abstract

Background: The importance of Qa-1 restricted CD8(+) T cells in regulating autoreactive T cell responses has been demonstrated in animal models for autoimmune disorders, including multiple sclerosis (MS).

Objective: We hypothesize that their human variant, HLA-E restricted CD8(+) T cells, fulfills a similar regulatory role in man and that these cells are of importance in MS.

Methods: A large cohort of MS patients and healthy controls was genotyped for the two known HLA-E polymorphisms. Flow cytometry was used to determine HLA-E expression kinetics and to phenotype HLA-E restricted CD8(+) T cells. Immunohistochemistry was performed to investigate HLA-E expression in the central nervous system (CNS) of MS patients.

Results: HLA-E is upregulated on immune cells upon in vitro activation and this upregulation is polymorphism-dependent for T and B cells. T and B cells in lesions of MS patients show enhanced HLA-E expression. Furthermore, NKG2C(+)CD8(+) T cells of MS patients have a significantly lower Foxp3 expression, while NKG2A(+)CD8(+) T cells of MS patients produce higher levels of pro-inflammatory cytokines compared to those of healthy individuals.

Conclusion: Our study indicates that the HLA-E system is altered in MS and could play a regulatory role in disease.

Keywords: CD8+ T cells; HLA-E; Multiple sclerosis; autoreactive T cells; cytotoxic T cells; polymorphisms; regulatory T cells.