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In the present study, to determine a possible role of insulin in the regulation of membrane functions, we have examined the relationship between plasma insulin level and membrane fluidity of erythrocytes in patients with essential hypertension and normotensive subjects. Membrane fluidity of erythrocytes obtained from hypertensive and normotensive subjects were evaluated by means of an electron paramagnetic resonance and spin-labeling method. The order parameter (S for 5-nitroxide stearate) and the peak height ratio (ho/h(-1) for 16-nitroxide stearate) obtained from electron paramagnetic resonance spectra of erythrocyte membranes were significantly higher in patients with essential hypertension than in normotensive subjects. The finding indicated that the erythrocyte membrane fluidity was lower in essential hypertension than in normotensive controls. The plasma concentration of insulin while fasting was also significantly greater in hypertensive patients than in normotensive subjects. In addition, the plasma insulin level was significantly correlated with the values of the order parameter (S) and the peak height ratio (ho/h(-1)), which showed that the higher plasma insulin was associated with the lower membrane fluidity of erythrocytes. These results support the hypothesis that insulin may actively participate in the regulation of membrane fluidity of erythrocytes in essential hypertension.

Hyperinsulinemia and membrane fluidity: Hyperinsulinemia is a determinant of membrane fluidity of erythrocytes in essential hypertension