Calcium kinetics in the aorta of spontaneously hypertensive rats.

In the search for abnormalities in hypertensive vessels Ca kinetics was studied in the aorta of spontaneously hypertensive rats (SHR). The uptake of 45Ca was significantly less in hypertensive animals but the uptake of 'Lanthanum resistant' 45Ca was not. The efflux of 45Ca from aorta of SHR was different (P less than 0.01) from that of control rats because of faster initial efflux. The half-life of the first 2 components of efflux curves was significantly shorter in SHR. Results are interpreted as consequences of decreased Ca binding by smooth muscle membrane in hypertensive vessels.