Anti-tumor necrosis factor-alpha improves myocardial recovery after ischemia and reperfusion

Department of Thoracic and Cardiovascular Surgery Ischilov Hospital and Institute of Pathology, Elias Sourasky-Tel-Aviv Medical Center, Israel.

OBJECTIVES: This study sought to assess the importance of locally released or paracrine myocardial tumor necrosis factor-alpha (TNF-alpha) in the evolution of postischemic myocardial dysfunction and to use immunohistochemical studies to localize TNF-alpha within the myocardium. BACKGROUND: TNF-alpha is implicated as a systemic mediator in the development of myocardial ischemia-reperfusion injury by promoting leukocyte myocardial infiltration, and it has been shown to originate from noncardiac peripheral mononuclear cells. We have recently documented in a blood-free environment the release of TNF-alpha from the ischemic-reperfused myocardium. METHODS: Isolated rat hearts undergoing 1 h of global cardioplegia-induced ischemia and 30 min of reperfusion were investigated with use of the modified Langendorff model. Hearts were randomly divided into three subgroups: group A, control group; and groups B and C, isolated hearts receiving cardioplegic solution containing monoclonal hamster antimurine TNF-alpha antibodies (group B) or hamster IgG (group C). RESULTS: Significant amounts of TNF-alpha were detected in group A and group C effluent on 1 min of reperfusion (752 +/- 212 and 958 +/- 409 pmol/ml, respectively). However, in group B, TNF-alpha was below detectable levels. In this group, postischemic left ventricular peak systolic pressures, first derivative of the rise in left ventricular pressure (dP/dtmax), pressure-time integral, coronary flow and O2 consumption improved (analysis of variance [ANOVA] p < 0.0001 for all variables) compared with values in groups A and C; creatine kinase levels decreased (p < 0.005); and myocardial structure was preserved. Immunohistochemical staining localized TNF-alpha to cardiac myocytes and to endothelial cells. CONCLUSIONS: Anti-TNF-alpha neutralizes local TNF-alpha release from cardiac myocytes after ischemia and improves myocardial recovery during reperfusion, indicating that postischemic paracrine TNF-alpha release plays an active role in myocardial dysfunction.

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