Clinical Studies Increased Membrane-Bound Calcium in Platelets of Hypertensive Patients


The fluorescent indicator chlortetracycline was used to estimate membrane-bound calcium in mild, untreated hypertensive patients (n=39) and normotensive controls (n=42). All participants were black. After incubation with chlortetracycline, platelet-rich plasma was centrifuged into a pellet and fluorescence was measured with a microspectrofluorometer. At an interval of 45 minutes mean fluorescence values were 11% higher in the hypertensive than in the normotensive group (567±95 vs. 512±100 counts/sec, p<0.02). With both groups of participants combined, a correlation of borderline statistical significance was noted between diastolic blood pressure and chlortetracycline fluorescence (r=0.213,p=0.056). In parallel experiments, sodium and potassium concentrations were measured in red blood cells. Intracellular sodium was also significantly higher hi the hypertensive group (p<0.01). These data indicate that the total cell burden of calcium is increased in the platelets of hypertensive individuals, possibly a result of abnormal cell metabolism of calcium, and further suggest that circulating platelets in hypertensive individuals may be hi a hyperaggregable state. (Hypertension 1989;13:139-144)

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@inproceedings{Cooper2005ClinicalSI, title={Clinical Studies Increased Membrane-Bound Calcium in Platelets of Hypertensive Patients}, author={Richard Cooper and Jeanette Lipowski and Earl S . Ford and Nasreen Shamsi and Harold Feinberg and Guy Le Breton}, year={2005} }