Stimulation of aortic tissue calcium uptake by an extract of spontaneously hypertensive rats erythrocytes possessing hypertensive properties
- 1 December 1986
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Physiology and Pharmacology
- Vol. 64 (12) , 1515-1520
- https://doi.org/10.1139/y86-255
Abstract
In earlier reports we have described the isolation of a fraction from the erythrocytes of spontaneously hypertensive rats that produced hypertension when administered to normotensive rats. In addition, it was found that the fraction stimulated the uptake of "lanthanum-resistant" calcium by aortic rings excised from normotensive rats. In these studies we have found that the fraction causes a greater increase in the in vitro uptake of calcium by aortic tissue than that produced by depolarization of the tissue with high K+ or the receptor-mediated influx of calcium induced with norepinephrine. The hypertensive fraction appeared to be more effective in promoting increased calcium uptake in rabbit than in rat aortic tissue, suggesting that significant differences in tissue sensitivity to the active compound(s) may exist between species. In addition, we obtained evidence indicating that the tissue sensitivity to the action of the hypertensive fraction was greater in aortae from spontaneously hypertensive rats than from those of normotensive animals. Attempts to block the action of the hypertensive fraction with verapamil, nifedipine, and sodium nitroprusside had no significant effect on the elevation in tissue calcium. It was found, however, that the action of the hypertensive fraction was temperature dependent with reduced activity at lower temperatures. The data suggest that a compound(s) is present in the erythrocytes of rats that may have a marked effect on vascular tissue metabolism of calcium.This publication has 3 references indexed in Scilit:
- Comparative effects of verapamil and sodium nitroprusside on contraction and 45Ca uptake in the smooth muscle of rabbit aorta, rat aorta and guinea-pig taenia coliBritish Journal of Pharmacology, 1984
- The role of calcium antagonism in the therapeutic action of drugsCanadian Journal of Physiology and Pharmacology, 1979
- CALCIUM FLUXES, CALCIUM-BINDING, AND ADENOSINE CYCLIC 3',5'-MONOPHOSPHATE-DEPENDENT PROTEIN-KINASE ACTIVITY IN AORTA OF SPONTANEOUSLY HYPERTENSIVE AND KYOTO WISTAR NORMOTENSIVE RATS1978