Endothelial modulation of ouabain-induced contraction and sodium pump activity in aortas of normotensive Wistar-Kyoto and spontaneously hypertensive rats.


:The influence of vascular endothelium on ouabain-induced contractions and sodium pump activity in aortic segments of Wistar-Kyoto (WKY) and spontaneously hypertensive rat (SHR) was analyzed. De-endothelialization increased and reduced ouabain-induced contractions in WKY and SHR segments, respectively. The effects of de-endothelialization were not reproduced by pretreatment of the segments with NG-nitro-L-arginine methyl ester, indomethacin, or 5, 8, 11, 14-eicosatetraenoic acid, acetyl salicylic acid, dazoxiben, phosphoramidon, BQ-123, or superoxide dismutase. Bioassay experiments suggest that ouabain releases a diffusible factor from endothelial cells that inhibits or facilitates digitalis-induced contractions in WKY and SHR segments, respectively. In a potassium-free solution, potassium-induced relaxation in segments of both strains was abolished by ouabain in de-endothelialized aortas and reduced in intact ones. Ouabain-sensitive 86Rb+ uptake was significantly reduced by de-endothelialization both in WKY and in SHR. These results suggest that the vascular endothelium of WKY and SHR aortas releases a diffusible factor that stimulates the sodium pump and/or protects it from ouabain blockade. Ouabain also releases a diffusible endothelium-derived factor in SHR aortas that facilitates ouabain-induced contractions.


J Vasc Res


Ponte A,Marín J,Arribas S,González R,Barrús MT,Salaices M,Sánchez-Ferrer CF




Has Abstract


1996-03-01 00:00:00












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