A haplotype at the MMP-9 locus is associated with high-blood pressure and arterial stiffness in patients with essential hypertension

Abstract

Summary Background Arterial stiffness is an independent predictor of cardiovascular events in hypertensive populations and is in part a heritable trait. Matrix metalloproteinase (MMPs) plays an important role in vascular remolding. MMP-9 levels predict cardiovascular risk and are associated with aortic stiffness. We investigated the influence of two MMP-9 polymorphisms (−1562C > T, 836G > A) on arterial stiffness and blood pressure in hypertensive subjects. Methods MMP-9 genotypes and plasma MMP-9 concentrations were determined in untreated patients (n = 217, mean age 46 ± 1 years). Supine blood pressure, carotid–femoral pulse wave velocity (PWV) and augmentation index (AIx) were assessed. Results Blood pressure and aortic PWV were higher in T allele carriers of the −1562C > T polymorphism and the A allele carriers of the 836G > A polymorphism. The two polymorphisms had a significant gene dose-dependent effect on PWV (p Conclusions Aortic PWV and blood pressure were modulated by −1562C > T and −836G > A polymorphisms in the MMP-9 gene in this treatment naive hypertensive population. These genetic polymorphisms may help to identify hypertensive patients at increased risk of cardiovascular events.