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Circulation Research. 1998;83:85-94

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(Circulation Research. 1998;83:85-94.)
© 1998 American Heart Association, Inc.


Original Contributions

Genetic Disruption of Poly (ADP-Ribose) Synthetase Inhibits the Expression of P-Selectin and Intercellular Adhesion Molecule-1 in Myocardial Ischemia/Reperfusion Injury

Basilia Zingarelli, Andrew L. Salzman, , Csaba Szabó

From Children's Hospital Medical Center, Division of Critical Care, Cincinnati, Ohio.

Correspondence to Basilia Zingarelli, MD, PhD, Children's Hospital Medical Center, Division of Critical Care, 3333 Burnet Ave, Cincinnati, OH 45229. E-mail bzingarelli{at}chmcc.org

Abstract—The nuclear enzyme poly (ADP-ribose) synthetase (PARS) has been shown to play an important role in the pathogenesis of ischemia/reperfusion injury and circulatory shock. The aim of this study was to investigate whether PARS activity may modulate endothelial-neutrophil interaction. We present evidence that genetic disruption of PARS provides protection against myocardial ischemia and reperfusion injury by inhibiting the expression of P-selectin and intercellular adhesion molecule-1 (ICAM-1) and, consequently, by inhibiting the recruitment of neutrophils into the jeopardized tissue. Furthermore, using in vitro studies, we demonstrate that in fibroblasts lacking a functional gene for PARS, cytokine-stimulated expression of ICAM-1 is significantly reduced compared with fibroblasts from animals with a normal genotype. Similarly, in cultured human endothelial cells, oxidative- or cytokine-dependent expression of P-selectin and ICAM-1 is reduced by pharmacological inhibition of PARS by 3-aminobenzamide. These findings provide the first direct evidence that PARS activation participates in neutrophil-mediated myocardial damage by regulating the expression of P-selectin and ICAM-1 in ischemic and reperfused myocardium, and they also provide the basis for a novel therapeutic approach for the treatment of reperfusion injury.


Key Words: nitric oxide • peroxynitrite • cell adhesion molecule • neutrophil • 3-aminobenzamide




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