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. 1976 Aug;58(2):439–446. doi: 10.1172/JCI108488

Localization of cardiac myosin-specific antibody in myocardial infarction.

B A Khaw, G A Beller, E Haber, T W Smith
PMCID: PMC333199  PMID: 956377

Abstract

Specific localization of purified antibody against cardiac myosin has been demonstrated in areas of altered myocardial membrane permeability after experimental myocardial infarction. Intravenously administered radioiodine-labeled antimyosin was selectively localized in infarcted myocardium of seven dogs 24 h after coronary occlusion. The mean ratio (+/-SE) of antimyosin antibody in infarcted to normal myocardium in the center of the infarct was 4.2+/-0.4 for endocardial and 2.9+/-0.3 for epicardial layers. By utilizing (Fab')2 fragments of antimyosin obtained by pepsin digestion of purified antibody, the ratio of uptake was increased in eight dogs to 6.1+/-0.6 in the endocardial and 3.3+/-0.4 in the epicardial layers at the infarct center 24 h after occlusion. These ratios were further increased in the infarct center to 13.8+/-1.2 in the endocardial and 7.3+/-0.8 in the epicardial layers when eight dogs were sacrificed 72 h after coronary occlusion. The specificity of antimyosin (Fab')2 localization in infarcted myocardium was demonstrated in four dogs by simultaneous intravenous administration of 125I-labeled antimyosin (Fab')2 and 131I-labeled normal rabbit gamma globulin (Fab')2. Nonspecific trapping of normal rabbit IgG (Fab')2 was observed to be about 38% of total antimyosin (Fab')2 uptake in the central zone of infarction. Regional blood flow was related to antimyosin (Fab')2 uptake in infarcted myocardium by utilizing simultaneous administration of 85Sr-labeled microspheres. An inverse exponential relationship between antimyosin (Fab')2 uptake and regional blood flow was observed (r=0.85). The specific localization of antimyosin antibody or its (Fab')2 components in infarcted myocardium suggests a conceptually new approach to myocardial infarct localization and sizing.

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Selected References

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