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J Hypertens Suppl 1986[Dec]; 4 (5): S182-5 PMID3553472show ga
Blood pressure, ionic and hormonal effects of high (1.8%) versus low (0.2%) dietary calcium intakes were explored in uninephrectomized DOC-NaCl rats, in two-kidney, one clip (2K, 1C) Goldblatt hypertensive rats and their respective controls. High-calcium diets lowered blood pressure (P less than 0.05) in DOC-NaCl and in control uninephrectomized rats drinking 1% NaCl. However, calcium loading in renin-dependent 2K, 1C rats elevated blood pressure (P less than 0.05) but had no effect in sham-operated controls. Plasma renin activity rose in all animals, while serum ionized calcium rose significantly only in dietary salt-loaded animals. Intracellular free magnesium levels were consistently, inversely linked to blood pressure (r = -0.92, P less than 0.001). This linkage was independent of plasma renin activity, serum ionized calcium values and dietary calcium content. These results demonstrate that the same alteration in dietary mineral content can produce opposite blood pressure effects in different pathophysiological subtypes of hypertensive disease. We conclude that intracellular free magnesium levels directly participate in the final common pathway of events regulating blood pressure and vasoconstrictor tone.
J+Hypertens+Suppl 1986 ; 4 (5): S182-5
