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- W2045495881 abstract "Vascular reactivity and systolic blood pressure (SBP) were studied in tail artery rings isolated from stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive, Wistar-Kyoto rats (WKY). After a control week on a diet with 1% of calcium, the animals were randomly assigned to three groups, which were fed with 1% (control), 0.4% (low) or 2.5% (high) dietary calcium. Both vascular reactivity and SBP were studied in the same animal during 9 weeks after changing diets. In the SHRSP rats on high Ca diet, maximal contractile responses to norepinephrine and serotonin (10(-10) to 10(-4) M) and to KCl (5 to 105 mM) were markedly decreased at the end of the study with respect to the control diet. These vascular changes were accompanied by a decrease of SBP in the same animals. Low calcium diet prevented the age-related increase of SBP in SHRSP rats and produced vascular changes of a lesser magnitude. WKY rats showed no significant modifications of SBP or vascular reactivity. Since plasmatic Ca2+ levels were not altered, the changes detected could not be attributed to a direct depressant effect of high calcium on the vascular smooth muscle cell (i.e. a stabilizing action of calcium). It is speculated that high dietary calcium could modulate the synthesis of calcium binding proteins of the plasma membrane, decreasing vascular reactivity and the elevated vascular resistance which is usually present in hypertension." @default.
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- W2045495881 date "1992-01-01" @default.
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- W2045495881 title "Dietary calcium on vascular reactivity in normotensive and spontaneously hypertensive rats" @default.
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- W2045495881 doi "https://doi.org/10.3109/13813459209000729" @default.
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