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Genetic variation in the renin-angiotensin system modifies the beneficial effects of ACE inhibitors on the risk of diabetes mellitus among hypertensives

Abstract

The aim of this study was to assess whether the association between angiotensin-converting enzyme (ACE) inhibitor use and the incidence of treated diabetes mellitus is modified by genetic polymorphisms in the renin-angiotensin system (RAS).In a nested case–control study, treated hypertensive patients were genotyped for ACE (insertion (I)/deletion (D)), angiotensinogen (AGT; M235T) and angiotensin II type 1 receptor (AGTR1; A1166C). Cases of newly treated diabetes were identified based on pharmacy records and controls were not yet drug treated for diabetes (case:control ratio 1:10). Self-administered questionnaires and physical examinations were used to assess risk factors for diabetes mellitus. Logistic regression was used to calculate the relative risk of diabetes associated with ACE inhibitor use relative to other antihypertensive treatment, stratified by the RAS genotypes. Among 205 cases and 2050 controls, homozygous 1166A carriers of the AGTR1 gene had a significantly decreased incidence of diabetes associated with current use of ACE inhibitors (odds ratio, OR: 0.47; 95% CI: 0.26–0.84), whereas this incidence was increased among 1166C allele carriers (OR: 1.32; 95% CI: 0.81–2.14). The interaction OR was 3.21 (95% CI: 1.53–6.75). ACE I allele carriers had a significantly reduced incidence of diabetes associated with ACE inhibitors use (OR: 0.63; 95% CI: 0.41–0.98), whereas DD homozygotes had no reduced risk (OR: 0.95; 95% CI: 0.46–1.96). The risk of diabetes associated with ACE inhibitor use was not significantly modified by the AGT-M235T polymorphism. Treatment with ACE inhibitors in hypertensive subjects significantly reduces the occurrence of diabetes in homozygous 1166A carriers of the AGTR1 gene and carriers of the ACE I allele, but not in 1166C allele carriers of the AGTR1 gene and in homozygous ACE D allele carriers.

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Acknowledgements

This study was funded by an unrestricted grant from Novo Nordisk BV and by the Scientific Institute for Dutch Pharmacists (WINAp). The department employing authors OHK, AB, ERH, and OB has received unrestricted research grants from GlaxoSmithKline, Organon, and Merck for the conduct of for pharmacoepidemiological research.

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Correspondence to O H Klungel.

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None of the above-mentioned grants are related to the current study and have no conflict of interest.

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Bozkurt, Ö., Verschuren, W., van Wieren-de Wijer, B. et al. Genetic variation in the renin-angiotensin system modifies the beneficial effects of ACE inhibitors on the risk of diabetes mellitus among hypertensives. J Hum Hypertens 22, 774–780 (2008). https://doi.org/10.1038/jhh.2008.62

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