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IL-6 expression is correlated with increased T-cell proliferation and survival in the arterial wall in giant cell arteritis.
Cardiovascular Pathology : the Official Journal of the Society for Cardiovascular Pathology 2018 March
Giant cell arteritis (GCA) is the most common vasculitis in adults affecting large and medium-sized arteries. IL-6 and T cell accumulation within the arterial wall contribute to the pathogenesis of GCA, and blockade of IL-6 activity is efficacious in its treatment. We examined the relationship between levels of IL-6 expression and immunological processes that control the expansion of T cells in GCA-positive temporal artery biopsies. CD4 T cells accumulated in clusters within the media and deep intima of all GCA lesions. There was a significant positive correlation between the expression of IL-6 mRNA and increased frequency of proliferating CD4 T cells. The expansion of T cells can be inhibited by T regs but IL-6 expression was not correlated with differences in T reg accumulation. Increased IL-6 levels were also significantly correlated with lower frequencies of CD4 T cells undergoing apoptotic cell death. In conclusion, IL-6 may contribute to the accumulation of CD4 T cells in GCA by supporting their proliferation and survival within the arterial wall through mechanisms that are independent of effects on local T reg expansion.
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