title: Platelet cGMP inversely correlates with age in healthy subjects.
abstract: Biochemical modifications associated with the increase in platelet activity with age are not well defined. Furthermore it is well known that the nitric oxide/cyclic 3', 5'-guanosine monophosphate (cGMP) pathway regulates platelet aggregation. The aim of the present study was to examine the relationship between platelet content of cGMP and age. 120 normal subjects, evaluating the cGMP platelet concentration, 17betaE2, IGF-I, dehydroepiandrosterone sulphate (DHEAS), insulin, plasma glucose, lipid pattern, homocysteine and PAI-I antigen, were studied. The multivariate analysis in a model with cGMP as dependent variable and with age, LDL, apolipoprotein B (ApoB), DHEAS, E2 and insulin-like growth factor (IGF)-I as independent variables shows a negative correlation between cGMP and age (p<0.01, beta=-0.388). In conclusion our data suggest that the reduced efficiency of the system constitutive nitric oxide synthase (cNOS)/guanylate cyclase represents at least one of the reasons of the increased platelet aggregability with age.
authors.affiliation: Department of Internal Medicine, Division of Endocrinology, University of Turin, Turin, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Origlia
authors.forename: G
authors.initials: G
authors.lastname: Pescarmona
authors.forename: A
authors.initials: A
authors.lastname: Capizzi
authors.forename: S
authors.initials: S
authors.lastname: Cogotti
authors.forename: R
authors.initials: R
authors.lastname: Gambino
authors.forename: M
authors.initials: M
authors.lastname: Cassader
authors.forename: A
authors.initials: A
authors.lastname: Benso
authors.forename: R
authors.initials: R
authors.lastname: Granata
authors.forename: V
authors.initials: V
authors.lastname: Martina
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D006152:Cyclic GMP / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010974:Platelet Aggregation / Q000502:physiology*; D012016:Reference Values
chemical_list: D006152:Cyclic GMP