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Immunocytochemical localization of creatine kinase M in canine myocardial cells: most creatine kinase M is distributed in the A-band

N Otsu, M Hirata, S Tuboi and K Miyazawa

Department of Clinical Laboratory, Yamagata University School of Medicine, Japan.

The localization of creatine kinase (CK) M in canine myocardium was immunocytochemically studied by a direct immunoperoxidase method. Specific antiserum against CK-M was produced in rabbits immunized with canine CK-MM. An anti-CK-M Fab'-horseradish peroxidase conjugate was prepared by the maleimide method. Frozen sections prepared from fixed canine myocardium were stained with the conjugate and observed by light and electron microscopy. In light microscopy of longitudinal sections, CK-M showed a cross-striated pattern consisting of distinct broad and narrow brown bands. Immunoelectron microscopy revealed that the regions of the broad and narrow brown bands corresponded to the A-band and the Z-line, respectively. Most CK-M in the A-band was associated with the thick fibers, and a small amount of CK-M was found in the M-line. These findings suggest that ATP regeneration from the ADP produced by myosin ATPase is related to the participation of this CK associated with the thick fibers rather than that of the M-line-bound CK. Creatine kinase M was also found in the sarcolemmal membrane, the membranes of the sarcoplasmic reticulum, and the mitochondrial outer and inner membranes. This report provides new information for understanding the physiological role of the phosphorylcreatine shuttle in the myocardial energy transport system.

Volume 37, Issue 10, pp. 1465-1470, 10/01/1989
Copyright © 1989 by The Histochemical Society


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