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Am J Physiol Heart Circ Physiol 284: H1348-H1357, 2003. First published January 2, 2003; doi:10.1152/ajpheart.00323.2002
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Vol. 284, Issue 4, H1348-H1357, April 2003

Coronary flow-induced inotropism is modulated by binding of dextrans to the endothelial luminal surface

Carmen Gonzalez-Castillo1, Rafael Rubio1, and Tania Zenteno-Savin2

1 Facultad de Medicina, Departomento de Fisiologia y Farmacologia, Universidad Autonona de San Luis Potosi, San Luis Potosi, San Luis Potosi CP 78210; and 2 Centro de Investigaciones Biologicas del Noroeste, La Paz, Baja California Sur, 23090 Mexico

In isolated perfused guinea pig hearts, coronary flow causes a positive inotropic effect [positive coronary flow-induced effect (+CFIE)] that could be altered by dextrans (Dx) in the coronary perfusion solution. To test this possibility, Dx of 20, 40, 70, and 500 kDa were infused and found to modulate +CFIE; however, when Dx infusion was terminated, the effect persisted, i.e., was irreversible/nonwashable, suggesting that Dx may bind to luminal endothelial lectinic structures. This hypothesis was tested when Dx [with fluorescent traces (D*)] bound to the vessel wall was hydrolyzed by dextranase infusion and washout of D* fragments completely reverted the +CFIE, and it was found that bound D* to be displaced by free Dx required concentrations 50-100 times that used during binding. In addition, dose-response curves for Dx on +CFIE show that the higher the Dx molecular mass, the lesser the concentration required to have an effect. Because a large Dx molecule has a greater number polymeric glucose branches, it can bind to a larger number of endothelial lectinic sites, requiring a lower concentration to affect +CFIE. Our results suggest that luminal endothelial lectinic structures are part of the flow-sensing assembly.

shearing stress; protein polymerization; steady state; irreversibility; endothelial glycocalyx; endothelial lectins; dextranase; albumin; interstitial volume


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