The severity of internal carotid artery stenosis is associated with the circulating Th17 level.

Abstract Aim Immune and inflammatory reactions contribute to the progression of atherosclerosis. The walls of the different arteries and segments of the arteries have heterogeneous haemodynamic and histological features. We aimed to explore the relationship between the circulating T-cell subsets and the abundance of carotid atherosclerosis in different segments of carotid arteries. Methods 70 patients underwent ultrasound duplex scanning to determine the degree of stenosis of the common carotid artery (CCA), the CCA bifurcation or the internal carotid artery (ICA). The blood frequencies of T-, B-, NK-cells, regulatory T cells (Treg), activated T-helpers (Th), IL10-producing Th, Th1 and Th17, as well as blood levels of hsCRP, sCD25, IL10 and IL17a were assessed. Results The frequencies of Th17 were increased in patients with ICA stenosis >35% and >50% vs. patients with ICA stenosis 50%). BMI positively correlated with the CCA bifurcation stenosis degree (r = 0.33, p Conclusion The severity of ICA stenosis can be associated with the circulating Th17 level.