title: Basal and stimulated platelet calcium and sodium in hypertensive versus normotensive black people.
abstract: To examine further the potential role of intracellular cations in hypertension a nested case-control study was carried out in conjunction with a population-based survey. Based on a house-to-house sampling scheme, 43 hypertensive and 56 normotensive black residents of Maywood, IL, were recruited. Free cytosolic calcium (Cai) and intracellular stores of calcium after stimulation with ionomycin were determined in platelets with the fluoroprobe Indo-I; intracellular sodium (Nai) measured at rest and after incubation with ouabain was estimated with SBFI. Cell sodium content was also assayed in erythrocytes. Resting Cai and Nai were not different in hypertensives compared with normotensives, although ionomycin-stimulated levels of Cai were correlated with systolic blood pressure (r = 0.3; P = 0.04). A consistent set of inter-relations among the various cation parameters was observed, lending support to the hypothesis that the cellular metabolism of sodium and calcium may be linked in the pathophysiological pathway to hypertension.
authors.affiliation: Department of Preventive Medicine and Epidemiology, Loyola University School of Medicine, Maywood, IL 60153, USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Cooper
authors.forename: H Y
authors.initials: HY
authors.lastname: Cheng
authors.forename: C
authors.initials: C
authors.lastname: Rotimi
mesh_terms: D000328:Adult; D000368:Aged; D044383:Black People; D002118:Calcium / Q000097:blood* / Q000502:physiology; D016022:Case-Control Studies; D003600:Cytosol / Q000378:metabolism; D005260:Female; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000208:ethnology* / Q000503:physiopathology; D015759:Ionomycin / Q000008:administration & dosage; D007476:Ionophores / Q000008:administration & dosage; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012964:Sodium / Q000097:blood* / Q000502:physiology
chemical_list: D007476:Ionophores; D015759:Ionomycin; D012964:Sodium; D002118:Calcium