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Immunocytochemical localization of 67 KD Ca2+ binding protein (p67) in ventricular, skeletal, and smooth muscle cells

H Iida, T Hatae and Y Shibata

Department of Anatomy, Faculty of Medicine, Kyushu University, Fukuoka, Japan.

By using immunocytochemical techniques, we examined the localization of a 67 kDa Ca2+ binding protein (p67) and calpactin I heavy chain (p36) in ventricular myocytes, skeletal myocytes, and intestinal smooth muscle cells. Immunofluorescence microscopy revealed that the p67 was expressed in all these muscle cells, whereas anti-p36 antibody stained cells in connective tissues but failed to stain these muscle cells. Immunogold electron microscopy was carried out to examine the subcellular localization of the p67 in muscle cells. The results showed that the p67 was exclusively confined to the plasma membrane of muscle cells and the presumptive transverse tubules of the striated myocytes. Immunoblot analysis with anti-p67 antibody showed that the p67 was indeed a constitutive protein of the sarcolemma isolated from rat hearts. These results indicate that the p67 is a sarcolemma-associated Ca2+ binding protein expressed in both striated myocytes and intestinal smooth muscle cells.

Volume 40, Issue 12, pp. 1899-1907, 12/01/1992
Copyright © 1992 by The Histochemical Society


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