title: Modulation of the inflammatory response in experimental myocardial infarction.
abstract: The role of inflammation in reperfused, ischaemic myocardium was assessed morphologically in 39 porcine hearts after 24 h (n = 23) and 72 h (n = 16) of reperfusion and after different antiphlogistic treatments. The left anterior descending coronary artery (LAD) was occluded distally for 45 min. Seven pigs received BW755C (10 mg kg-1) i.v. prior to ischaemia (A), eight pigs were given the same dose before 24 h of reperfusion (B), and eight pigs were treated with iloprost (25 ng kg-1 min-1) i.v. before occlusion and continuously for 72 h (C). Two groups of eight pigs each served as controls for 24 h (D) and 72 h (E) of reperfusion. Infarct sizes were determined, myocardium was investigated by light microscopy, and polymorphonuclear leucocytes (PMNs) and macrophages were quantitated after histo- and immunohistochemical staining. Jeopardized myocardium contained 129 neutrophils mm-2 and 120 macrophages mm-2 (D) vs 10 neutrophils mm-2 and 290 macrophages mm-2 (E). Neutrophils and infarct sizes were only significantly decreased in group A (68 neutrophils mm-2, 30% reduction of infarct size). Macrophages infiltration was not significantly affected for all treatment groups (A, B, C). It is concluded that myocardial infarct sizes are neutrophil-mediated postischaemic tissue injury can be reduced by BW755C applied prior to ischaemia. Neutrophil-mediated myocardial injury is unlikely to occur beyond 3 days of reperfusion.
authors.affiliation: Institute of Pathology, General Hospital of Detmold, University of Münster, Germany.
authors.forename: R M
authors.initials: RM
authors.lastname: Bohle
authors.forename: S
authors.initials: S
authors.lastname: Pich
authors.forename: H H
authors.initials: HH
authors.lastname: Klein
mesh_terms: D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine / Q000627:therapeutic use*; D000818:Animals; D005260:Female; D016285:Iloprost / Q000627:therapeutic use*; D007249:Inflammation / Q000473:pathology; D008264:Macrophages / Q000502:physiology; D008297:Male; D009203:Myocardial Infarction / Q000188:drug therapy* / Q000473:pathology; D015428:Myocardial Reperfusion Injury / Q000188:drug therapy* / Q000473:pathology; D009206:Myocardium / Q000473:pathology*; D009504:Neutrophils / Q000502:physiology; D013997:Time Factors
chemical_list: D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine; D016285:Iloprost