title: Distribution of LDH-1 in normal, ischemic, and necrotic myocardium. An immunoperoxidase study.
abstract: To study the distribution of lactate dehydrogenase (LDH-1) (H4) in normal, ischemic, and necrotic myocardium using the peroxidase-antiperoxidase technic, the authors studied formalin-fixed paraffin-embedded sections of human (n = 11) and canine (n = 28) myocardium. All normal control myocardium showed positive immunostaining for LDH-1 (H4). In infarcts 10 hours or more old, the histologically necrotic myocardium (by triphenyl tetrazolium chloride staining) (TTC) showed markedly diminished immunostaining. In 24-dogs ischemia was induced in a closed-chest model using a balloon-tipped catheter inflated in the left anterior descending coronary artery. In dogs with 3 hours or more of occlusion, myocardium that was necrotic by TTC staining, light and/or electron microscopy, showed diminished staining for LDH-1, while normal, control myocardium stained intensely. In four dogs, ischemia was induced by a controlled perfusion apparatus by which left main coronary flow was reduced by 50%. Ischemia without necrosis was documented by demonstration of glycogen loss with no light or electron microscopic evidence of necrosis. These ischemic fibers stained intensely for LDH-1, as did controls. Thus, by immunoperoxidase staining, LDH-1 can be demonstrated in normal human and canine myocardium. In experimental models of ischemia in dogs, tissue that was ischemic but not necrotic showed no diminished staining. LDH-1 loss can be detected in necrotic myocardium as early as 3 hours after coronary artery occlusion.
mesh_terms: D000818:Animals; D003327:Coronary Disease / Q000201:enzymology; D004285:Dogs; D006801:Humans; D007124:Immunoenzyme Techniques; D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase / Q000378:metabolism*; D009203:Myocardial Infarction / Q000201:enzymology; D009206:Myocardium / Q000201:enzymology*; D009336:Necrosis; D013194:Staining and Labeling; D014018:Tissue Distribution
chemical_list: D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase