(Hypertension. 1999;33:775-780.)
© 1999 American Heart Association, Inc.
Scientific Contributions |
From Médecine B (M.M., B.B., G.B.), University Hospital, Angers; Institut National de la Santé et de la Recherche Médicale U367 (M.M, F.A.-G.), Paris; Biochemistry Department (Y.G.) and Nuclear Medicine Department (J.-J. Le J.), University Hospital, Angers; and Medical Informatics (G.C.), Broussais Hospital, Paris, France.
AbstractHyperglycemia causes
capillary vasodilation and high glomerular capillary
hydraulic pressure, which lead to
glomerulosclerosis and hypertension in type 1
diabetic subjects. The insertion/deletion (I/D) polymorphism of the
angiotensin Iconverting enzyme (ACE) gene can modulate
risk of nephropathy due to hyperglycemia, and the II
genotype (producing low plasma ACE concentrations and probably
reduced renal angiotensin II generation and kinin
inactivation) may protect against diabetic nephropathy. We
tested the possible interaction between ACE I/D polymorphism and
uncontrolled type 1 diabetes by measuring glomerular
filtration rate (GFR) and effective renal plasma flow (ERPF) during
normoglycemia (
5 mmol/L) and hyperglycemia (
15 mmol/L)
in 9 normoalbuminuric, normotensive type 1 diabetic subjects
with the II genotype and 18 matched controls with the ID or DD
genotype. Baseline GFR (145±22 mL/min per 1.73 m2)
and ERPF (636±69 mL/min per 1.73 m2) of II subjects
declined by 8±10% and 10±9%, respectively, during hyperglycemia;
whereas baseline GFR (138±16 mL/min per 1.73 m2) and ERPF
(607±93 mL/min per 1.73 m2) increased by 4±7% and
6±11%, respectively, in ID and DD subjects (II versus ID or DD
subjects: P=0.0007 and P=0.0005, for GFR
and ERPF, respectively). The changes in renal
hemodynamics of subjects carrying 1 or 2 D alleles
were compatible, with a mainly preglomerular vasodilation
induced by hyperglycemia, proportional to plasma ACE concentration
(P=0.024); this was not observed in subjects with the II
genotype. Thus, type 1 diabetic individuals with the II
genotype are resistant to glomerular
changes induced by hyperglycemia, providing a basis for their reduced
risk of nephropathy.
Key Words: glomerular disease diabetic nephropathy genetics angiotensin-converting enzyme
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