Renin-angiotensin system gene polymorphisms influence blood pressure and the response to angiotensin converting enzyme inhibition.
OBJECTIVE
To investigate the relationship between polymorphisms in the angiotensin converting enzyme (ACE), angiotensinogen (AGT) and type 1 angiotensin-II (AT1R) genes and (1) quantitative variations in blood pressure and (2) the blood pressure response to ACE inhibition in a hypertensive cohort.


METHODS
We administered monotherapy with ACE inhibitors to 125 previously untreated essential hypertensives. Genotypes for ACE insertion and deletion, AGT M235T and AT1R A1166-->C polymorphisms were determined in DNA extracted from peripheral blood leucocytes. The influence of genotype on pretreatment blood pressure and the ACE inhibitor-induced decrease in blood pressure was tested by analysis of variance and multiple regression analysis, adjusting for age, sex, body mass index, alcohol intake and, where appropriate, pretreatment blood pressure.


RESULTS
ACE and AT1R genotypes were independent predictors of pretreatment systolic and diastolic blood pressure, with an apparent interaction between these two gene loci. Although it did not influence pretreatment blood pressure in this population, AGT genotype was an independent predictor of the blood pressure response to ACE inhibition.


CONCLUSIONS
The ACE and AT1R gene loci (chromosomes 17q and 3q, respectively) may carry alleles influencing blood pressure variation in this hypertensive population, with a possible epistatic interaction between the two loci. The AGT T235 allele does not appear to be a marker for blood pressure variation in this group, but variants on chromosome 1q lying in or near the AGT gene may contribute to individual differences in the blood pressure response to ACE inhibition. Among essential hypertensives, differences in the ACE inhibitor response appear, in part, to be genetically determined.
Clinical Pharmacology Unit, University of Cambridge, UK.
A D
AD
Hingorani
H
H
Jia
P A
PA
Stevens
R
R
Hopper
J E
JE
Dickerson
M J
MJ
Brown
D000293:Adolescent; D000328:Adult; D000368:Aged; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000494:pharmacology*; D001483:Base Sequence; D001794:Blood Pressure / Q000187:drug effects*; D005260:Female; D005838:Genotype; D006801:Humans; D006973:Hypertension / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D007703:Peptidyl-Dipeptidase A / Q000187:drug effects / Q000378:metabolism*; D011110:Polymorphism, Genetic / Q000235:genetics*; D012044:Regression Analysis; D012084:Renin-Angiotensin System / Q000187:drug effects / Q000235:genetics*; D012189:Retrospective Studies
D000806:Angiotensin-Converting Enzyme Inhibitors; D007703:Peptidyl-Dipeptidase A