A chimeric IgG4 monoclonal antibody directed against CD18 reduces infarct size in a primate model of myocardial ischemia and reperfusion

Thomas Aversano, Wei Zhou, Mark Nedelman, Marian Nakada, Harlan Weisman

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


Objectives.: This study attempted to determine whether neutrophil sequestration in reperfused myocardium can be inhibited and infarct size reduced by treatment with a chimeric, monoclonal IgG4 antibody (CLB54) directed against CD18 in a primate model of acute myocardial ischemia and reperfusion. Background.: Reperfusion injury, in part mediated by neutrophils, may limit the potential benefit of reestablishing infarctrelated artery patency in patients with acute myocardial infarction. Methods.: Nineteen closed-chest baboons (10 control, 9 treated with CLB54) had the left anterior descending coronary artery occluded for 90 min, followed by 4 h of reflow. CLB54 (mean [±SD] 11 ± 2 mg/kg body weight) or saline solution was administered intravenously 20 min before reflow. Coronary flow was determined using radiolabeled microspheres, infarct size by triphenyltetrazolium chloride staining, global and regional ventricular function by contrast ventriculography and neutrophil accumulation by a myeloperoxidase assay. Results.: Risk region size was the same in both groups. CLB54 treatment reduced infarct size expressed as a percent of the risk region from 41 ± 20% in the saline-treated group to 19 ± 17% in the CLB54-treated group (p < 0.02). This was associated with diminished myeloperoxidase activity and greater postreperfusion coronary flow in the risk region in CLB54-treated than in control baboons. Ejection fraction declined to the same extent in both groups, whereas anterior wall regional cord shortening was better preserved in CLB54-treated baboons. Conclusions.: Inhibition of neutrophil sequestration with CLB54 administered before reperfusion reduces infarct size, preserves ischemic zone microvascular perfusion and minimizes the decline of regional wall motion.

Original languageEnglish (US)
Pages (from-to)781-788
Number of pages8
JournalJournal of the American College of Cardiology
Issue number3
StatePublished - Mar 1 1995

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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