Arterial stiffness and genetic polymorphism of some cytokines in normotensive patients with ankylosing spondylitis

Aim of the study was to identify the incidence of arterial stiffness in normotensive patients with ankylosing spondylitis (AS) in the Trans-Baikal region, to study polymorphism of genes for some cytokines and prognostic factors for increased arterial stiffness in this disease. Material and methods. We examined 100 patients with AS, natives of the Transbaikal region, HLA-В27 positive and 100 healthy controls, HLA-B27 negative; all included in the study were Caucasian. Arterial hypertension was an exclusion criterion. Determination of single nucleotide polymorphisms of the genes IL1B (‒31T/C, rs1143627), IL10 (‒592C/A, rs1800872), IL10 (‒819C/T, rs1800871), TNF (‒308G/A, rs1800629) was carried out in all patients with AS and healthy individuals. 74 patients with AS and 40 patients in the control group underwent applanation tonometry using SphygmoCor (AtCor Medical, Australia). Results. Pulse wave velocity on the carotid-femoral segment in patients with AS was 6.5 [4.1; 11.7] m/s, in the control group – 5.2 [3.9; 7.0] m/s (p = 0.0001). In 18 patients with AS (24.32 %) it was more than the age norm, these patients made up the group with elevated arterial stiffness. In patients with AS, carriage of the homozygous AA genotype of the IL10 gene (rs1800872, ‒592C/A) was 2.18 times more common, the homozygous GG genotype of the TNF gene (rs1800629, ‒308G/A) was 1.23 times more common, and the heterozygous ST genotype of the IL10 gene (rs1800871, ‒819C/T) was 1.5 times more common than in the control group. Prognostic factors for increased arterial stiffness in patients with AS were carriage of the IL10 rs1800871 polymorphism, age, and the radiological stage of changes in the sacroiliac joints. Conclusions. Increased arterial stiffness was detected in 24.3 % of normotensive patients with AS. The CT genotype of the IL10 gene (rs1800871, ‒819C/T), AA genotype of the of the IL10 gene (rs1800872, ‒592C/A), the G allele and the GG genotype of the TNF gene (rs1800629, позиция ‒308G/A) are associated with the development of AS in Caucasians. Multivariate regression analysis identified clinical and genetic factors that predict an increase in arterial stiffness in patients with AS, natives of the Trans-Baikal Territory.

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