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Clinical Chemistry 44: 2083-2087, 1998;
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(Clinical Chemistry. 1998;44:2083-2087.)
© 1998 American Association for Clinical Chemistry, Inc.

Molecular Diagnostics and Genetics

Plasma concentration, kinetic constants, and gene polymorphism of angiotensin I-converting enzyme in centenarians

Laurence Faure-Delanef1, Bruno Baudin2,3,a, Bénédicte Bénéteau-Burnat2, Jean-Christophe Beaudoin1, Jacqueline Giboudeau2, and Daniel Cohen1

1 Fondation Jean Dausset CEPH, 27 avenue Juliette Dodu, 75010 Paris, France.

2 Laboratoire de Biochimie A, Hôpital Saint-Antoine, AP-HP 75571 Paris Cedex 12, France.

3 Laboratoire de Biochimie et Glycobiologie, Université René Descartes, UFR-Pharmacie, 4 avenue de l'Observatoire, 75270 Paris Cedex 06, France.
a Address correspondence to this author at: Laboratoire de Biochimie A, Hôpital Saint-Antoine, 184, rue du Fbg Saint-Antoine, 75571 Paris Cedex 12, France. Fax 33-1 49 28 20 77; e-mail bruno.baudin{at}sat.ap-hop-paris.fr.

We have determined serum activity and kinetic constants of angiotensin I-converting enzyme (ACE), parallel to an insertion/deletion (I/D) polymorphism in its gene, in French centenarians and controls 20–70 years of age because this enzyme could have an impact on cardiovascular risk, and thus on longevity. Both the ACE D allele and ACE D/D genotype were more frequent in centenarians in comparison with controls, without sex-related differences nor significant correlation with a cardiovascular pathology. In centenarians, I/D polymorphism was correlated with circulating ACE activity (D/D genotype, 89.0 ± 36.8 U/L; I/D genotype, 63.5 ± 26.0 U/L; and I/I genotype, 55.1 ± 39.4 U/L). The Michaelis constants for two substrates were identical whatever the genotype and were not different between centenarians and controls, i.e., 0.30 ± 0.03 mmol/L for furylacryloyl-phenylalanyl-glycyl-glycine and 1.35 ± 0.05 mmol/L for hippuryl-histidyl-leucine; for the latter, the optimal pH and activating concentration of chloride did not depend on I/D polymorphism. The maximal velocities with both substrates reflected the distribution of serum ACE activity as a function of the genotypes, in centenarians and in controls. In conclusion, plasma ACE activity is subject to a similar genotypic influence in centenarians as in adults 20–70 years of age; however, ACE itself appears to be functionally similar for each genotype. Furthermore, the D allele as well as the higher serum ACE activities associated with the D/D genotype cannot discriminate individuals at high risk for cardiovascular diseases, major causes of mortality before the age of 100 years.




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