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A Comparison of Free Intracellular Calcium and Magnesium Levels in the Vascular Smooth Muscle and Striated Muscle Cells of the Spontaneously Hypertensive and Wistar Kyoto Normotensive Rat

Abnormalities in the cellular handling of Ca2+ (see McCarron') and Mg2+ (see Altura et aL2) have been postulated to play an important role in the pathogenesis of hypertension. Observed increases in intracellular CaZC concentration in the platelets of hypertensive humans have not been confirmed in the platelets of spontaneously hypertensive (SHR) rats compared to the Wistar Kyoto normotensive (WKY) rat. Furthermore the inaccessibility of vascular smooth muscle cells (VSM) has limited experiments to platelets and red cells. We now present the [Ca2+], and [Mg2+], in VCM and striated muscle (SM) from SHR and WKY rat cells in culture.