Red blood cell abnormalities and spontaneous hypertension in the rat. A genetically determined link. Hypertension

SUMMARY The significance of the erythrocyte abnormalities described in rats and humans with spontaneous hypertension is far from clear. This study, in two highly inbred strains of rats, was designed to evaluate whether these abnormalities are primary and thus genetically related to hyper-tension. The Milan hypertensive strain (MHS) and its normotensive control strain (MNS) were used to carry out two types of experiments. In two groups of lethally irradiated (MHS x MNS) F, hybrids, bone marrow from MHS or MNS was transplanted. The differences in red cell function between the recipients of bone marrow from MHS and recipients of bone marrow from MNS were similar to those existing between the parental donor MHS and MNS: Na+-K+ cotransport was increased (p < 0.02) and intracellular Na+ content (p < 0.05) and cell volume (p < 0.02) were decreased in MHS. The same pattern was observed when this experiment was repeated in different groups of F, hybrids. In individuals of the segregating F2 population, obtained by crossing the (MHS x MNS) F, hybrids, there was a positive correlation (p < 0.001) between the red blood cell Na +-K+ cotransport and the mean blood pressure. These results indicate that the erythrocyte abnormalities may well be genetically associated with the primary cause of spontaneous hypertension in rats. Because of the many similari-ties demonstrated when young prehypertensive MHS or humans prone to develop hypertension ar