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Net Na+ and K+ fluxes were measured in Na+-loaded and K+-depleted erythrocytes of three varieties of genetically hypertensive rats. In Okamoto spontaneously hypertensive rats (4 and 10-12 weeks of age), Na+ extrusion was reduced as compared to normotensive controls (Wistar/Kyoto). Na+ extrusion was also reduced in the hypertension-prone substrain of the Hebrew University Sabra rats as compared to the Na+-resistant substrain. K+ fluxes were similar in both groups. In both Okamoto spontaneously hypertensive rats and the hypertension-prone substrain, hypertension was severe and developed rapidly. In the Lyon spontaneously hypertensive rats, in which the blood pressure elevation is less severe than in other genetically hypertensive rats, erythrocyte net Na+ extrusion was the same as in normotensive controls, but net K+ gain was slightly increased. These erythrocyte abnormalities, observed in three varieties of genetically transmitted hypertension of the rat, are in several aspects similar to those previously described in accelerated and benign human essential hypertension. Erythrocyte Na+ and K+ net flux alterations may thus represent biochemical markers of primary hypertension.
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