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The effect of polymorphisms in the renin-angiotensin-aldosterone system on diabetic nephropathy risk
Umeå universitet, Medicinska fakulteten, Institutionen för klinisk vetenskap, Pediatrik.
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin.
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2008 (Engelska)Ingår i: Journal of diabetes and its complications, ISSN 1056-8727, E-ISSN 1873-460X, Journal of diabetes and its complications, ISSN 1873-460X, Vol. 22, nr 6, s. 377-383Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

OBJECTIVES: The risk of diabetic nephropathy (DN) can be increased by elevated intraglomerular pressure and glomerular filtration rate, leading to glomerular damage. This can be controlled by the renin-angiotensin-aldosterone (RAA) system, which has an important function regulating both systemic and intrarenal blood pressure. Smoking increases the risk of DN, but not all diabetic patients who smoke develop DN. There is a possibility that smoking has different effects depending on the different genotypes of the individual. We investigated the association of DN with seven polymorphisms in the RAA system and their possible interaction with smoking. SUBJECTS AND METHODS: In the present case-control study, type 1 diabetic patients with diabetes duration > or =20 years, without albuminuria and without antihypertensive treatment (n=197), were included as controls. An albumin excretion rate (AER) of 20-200 microg/min (n=73) was considered as incipient DN, and an AER >200 microg/min was considered as overt DN (n=48). Smoking habits were obtained from questionnaires. RESULTS: Homozygosity for the A allele, of the angiotensin II type 1 receptor (AGTR1) A1166C polymorphism, was associated with increased risk of overt DN (OR=3.04; 99% CI=1.02-9.06), independently of the other associated variables: age, duration of diabetes, ever smoking, HbA1c, and sex. The effect of the AA genotype was enhanced to a four times risk increase among ever-smoking patients. Two alleles of the microsatellite marker adjacent to the angiotensinogen gene were less common among nephropathy cases than among controls, but this was not significant when controlling for the same variables as above. CONCLUSIONS: The risk of having overt DN was increased in patients homozygous for the A1166 allele, and smoking seemed to enhance the effect of the AGTR1 genotype.

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2008. Vol. 22, nr 6, s. 377-383
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URN: urn:nbn:se:umu:diva-20862DOI: 10.1016/j.jdiacomp.2007.06.005PubMedID: 18413189OAI: oai:DiVA.org:umu-20862DiVA, id: diva2:209778
Tillgänglig från: 2009-03-27 Skapad: 2009-03-27 Senast uppdaterad: 2018-06-09

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Möllsten, AnnaDahlquist, Gisela

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