Feb 22, 2005

The fibrin-derived peptide Bbeta15-42 protects the myocardium against ischemia-reperfusion injury

Nature Medicine
P PetzelbauerK Zacharowski

Abstract

In the event of a myocardial infarction, current interventions aim to reopen the occluded vessel to reduce myocardial damage and injury. Although reperfusion is essential for tissue salvage, it can cause further damage and the onset of inflammation. We show a novel anti-inflammatory effect of a fibrin-derived peptide, Bbeta15-42. This peptide competes with the fibrin fragment N-terminal disulfide knot-II (an analog of the fibrin E1 fragment) for binding to vascular endothelial (VE)-cadherin, thereby preventing transmigration of leukocytes across endothelial cell monolayers. In acute or chronic rat models of myocardial ischemia-reperfusion injury, Bbeta15-42 substantially reduces leukocyte infiltration, infarct size and subsequent scar formation. The pathogenic role of fibrinogen products is further confirmed in fibrinogen knockout mice, in which infarct size was substantially smaller than in wild-type animals. Our findings conclude that the interplay of fibrin fragments, leukocytes and VE-cadherin contribute to the pathogenesis of myocardial damage and reperfusion injury. The naturally occurring peptide Bbeta15-42 represents a potential candidate for reperfusion therapy in humans.

Mentioned in this Paper

Ischemia
Pathogenic Aspects
Fibrin Measurement
Pathogenesis
Leukocyte Differentiation Antigens, Human
Pathogenic Organism
Fibrinogen
Fibrinogen Assay
Anti-Inflammatory Agents
Blood Vessel

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