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Your search keyword '"Aiello, Ernesto A."' showing total 5 results
Start Over Author "Aiello, Ernesto A." Journal circulation research
5 results on '"Aiello, Ernesto A."'

5. Autocrine stimulation of cardiac Na(+)-Ca(2+) exchanger currents by endogenous endothelin released by angiotensin II.

Author

Aiello EA, Villa-Abrille MC, and Cingolani HE

Subjects
Angiotensin II pharmacology, Animals, Autocrine Communication drug effects, Cats, Endothelin Receptor Antagonists, In Vitro Techniques, Ion Transport drug effects, Ion Transport physiology, Membrane Potentials drug effects, Myocardium cytology, Patch-Clamp Techniques, Peptides, Cyclic pharmacology, Sodium-Calcium Exchanger antagonists & inhibitors, Thiourea pharmacology, Angiotensin II metabolism, Autocrine Communication physiology, Endothelins metabolism, Myocardium metabolism, Sodium-Calcium Exchanger metabolism, Thiourea analogs & derivatives
Abstract

The goal of the present study was to evaluate the effects of Ang II on the current produced by the Na(+)-Ca(2+) exchanger (I(NCX)) working in the reverse mode and the possible autocrine role played by the release of endothelin (ET) in these actions. I(NCX) was studied in isolation in cat cardiac myocytes. Angiotensin II (Ang II) (100 nmol/L) increased I(NCX) at potentials higher than 0 mV (at +60 mV: 2.07 +/- 0.22 pA/pF in control versus 2.73 +/- 0.22 pA/pF in Ang II, n=9; P<0.05). The increase in I(NCX) induced by Ang II was prevented by the treatment of the cells with the unspecific blocker of the ET receptors, TAK 044 (1 micromol/L) (at +60 mV: 2.15 +/- 0.27 pA/pF in control versus 2.01+/- 0.26 pA/pF in Ang II, n=5, NS). These results show, for the first time, that the effect of Ang II on I(NCX) is the result of the autocrine actions of ET released by the octapeptide.

Published
2002
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