Complement localization and mediation of ischemic injury in baboon myocardium

The Journal of Clinical Investigation
R N PinckardM S Olson

Abstract

We sought to determine whether the third component of complement (C3) is localized in ischemic baboon myocardium after coronary artery ligation. Furthermore, we assessed the effects of prior C3 depletion on myocardial necrosis. We studied seven control baboons (group I) and seven C3-depleted (group II) baboons that were killed 24 h after ligation of the anterior descending coronary artery. Multiple tissue samples were obtained from infarct, intermediate, and normal myocardial sites as defined by serial unipolar epicardial ECG mapping. In group I baboons, myocardial creatine kinase content from infarct sites was reduced as compared with normal sites (12.6+/-0.92 [SE] vs. 24.4+/-0.75 IU/mg protein, P < 0.001). The intermediate sites from group I contained more creatine kinase (19.0+/-1.25 IU/mg protein) than infarct sites (P < 0.001), but less (P < 0.025) than normal sites. In group II, intermediate sites showed no significant reduction in creatine kinase from normal sites and there was significantly less creatine kinase depletion in infarct sites when compared with group I animals (33.7+/-4.6 and 51.4+/-1.8% depletion, respectively, P < 0.001). In all seven group I baboons, uniform C3 localization was observed in infarct sites b...Continue Reading

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