Enhanced PAR-2 activation using PAR-2-activating peptide improved the efficiency of ischemic preconditioning and reduced cardiac inflammation, oxidative injury, and infarct size in rat hearts.
Does PAR-2-activating peptide infusion improve ischemic preconditioning and reduce cardiac inflammation in Langendorff-perfused rat hearts?
PAR-2 activation improves ischemic preconditioning and reduces cardiac inflammation and infarct size in an experimental rat heart model.
Protease-activated receptor-2 (PAR-2) is a member of seven transmembrane domain G protein-coupled receptors activated by proteolytic cleavage. PAR-2 is involved in inflammatory events and cardiac ischemic reperfusion injury. The objective of this study was to investigate the effects of PAR-2 in experimental myocardial ischemic preconditioning. To monitor the effects of PAR-2, Langendorff-perfused rat hearts were used. These hearts were treated with PAR-2-activating peptide (PAR-2AP) in various protocols. Hemodynamic parameters (left ventricular developed pressure, left ventricular diastolic pressure, coronary flow rate, and heart rate), several indexes of oxidative injury, and neutrophil accumulation were evaluated. We show for the first time that enhanced PAR-2 activation improves efficiency of ischemic preconditioning and reduces cardiac inflammation in the rat heart. Indeed, after PAR-2AP infusion we found that hemodynamic parameters, oxidative injury, infarct size, and neutrophil accumulation were involved. These data support the concept that PAR-2-dependent cell trafficking may regulate signaling responses to cardiac ischemia and inflammation.
Napoli et al. (Sat,) conducted a other in Myocardial ischemic preconditioning. PAR-2-activating peptide (PAR-2AP) was evaluated on Hemodynamic parameters, oxidative injury, infarct size, and neutrophil accumulation. Enhanced PAR-2 activation using PAR-2-activating peptide improved the efficiency of ischemic preconditioning and reduced cardiac inflammation, oxidative injury, and infarct size in rat hearts.