Lowering of blood pressure leads to decreased circulating interleukin-6 in hypertensive subjects

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Abstract
Interleukin-6 (IL-6), the major proinflammatory cytokine, has been described to be associated with the hypertensive and atherosclerotic states. We aimed to explore whether the concentration of circulating IL-6 and adhesion molecules could be modified by decreasing blood pressure in hypertensive subjects. A total of 30 subjects (18 men), aged 34–48 years, were enrolled in this study, 17 hypertensive never-treated patients (HTA) and 13 normotensive subjects (C). HTA subjects were treated with irbesartan, 150–300 mg/day for 3 months, and serum IL-6, vascular cell adhesion molecule-1, intercellular adhesion molecule-1, sP-selectin, sE-selectin and monocyte chemoattractant protein-1 were measured at 0 and 12 weeks. The two study groups were similar in age, body mass index (BMI) and gender. At baseline, circulating IL-6 levels, but not adhesion molecules, were significantly associated with systolic blood pressure (r=0.41; P=0.03) and BMI (r=0.53; P=0.005). Systolic and diastolic blood pressure decreased significantly (PP=0.02) reaching a similar concentration to normotensive patients (3.330.3 pg/ml) after treatment with irbesartan. No significant changes were observed in any other of the tested parameters. In conclusion, the treatment of high blood pressure lowers circulating IL-6 in young hypertensive patients.

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