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- W2116750960 abstract "The tail artery of the spontaneously hypertensive rat (SHR) (Carworth Farms), excised rapidly and immersed immediately in cold (2 degrees C) Li-substituted physiologic salt solution (LiPSS), continues to exchange cell Na+ and K+ for Li+, this exchange is negligible to the control (Carworth Farms normotensive) CFN). In the incubated artery at 37 degrees C, when the vascular smooth muscle cell is slack, the leakiness of the cell membrane in the SHR is more than offset by increased Na+ pumping activity, so that cell Na+ is subnormal. A high precision technique with ion-specific electrodes was developed to follow the passive downhill and active uphill phases of Na+-K+ exchange in the perfused artery exposed to K+-free physiologic salt solution (K+-free PSS) followed by physiological salt solution (PSS). The exchange was found to be fully reversible and sufficiently equimolar to be definable in terms of movements of K+ alone. The rates of ionic movement across the vascular smooth muscle cell were found to be about 6 times faster for the vessel perfused at low pressure (less than 3 mm Hg) than for the slack incubated artery. The rate of passive downhill movement was significantly accelerated in the mature SHR compared with CFN, and the net active transport activity much enhanced. Similar changes were seen as early as 3 weeks after treatment with DOCA and were pronounced at 8 weeks. It is proposed that conditions favoring a sustained accumulation of Na+ in the vascular smooth muscle cell are countered by an enhanced synthesis of transport protein, of contractile protein, and of paracellular matrix protein which progressively restructure the wall." @default.
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- W2116750960 date "1976-09-01" @default.
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- W2116750960 title "Cell permeability, sodium transport, and the hypertensive process in the rat." @default.
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- W2116750960 doi "https://doi.org/10.1161/01.res.39.3.433" @default.
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