Summary
FITC-labelled antibodies against native actin from chicken gizzard smooth muscle (Gröschel-Stewart et al., 1976) have been used to stain cultures of guinea-pig vas deferens and taenia coli, rabbit thoracic aorta, rat ventricle and chick skeletal muscle. The I-band of myofibrils of cardiac muscle cells and skeletal muscle myotubes stains intensely. In isolated smooth muscle cells, the staining is located exclusively on long, straight, non-interrupted fibrils which almost fill the cell. Smooth muscle cells which have undergone morphological “dedifferentiation” to resemble fibroblasts with both phase-contrast microscopy and electronmicroscopy still stain intensely with the actin antibody. In those muscle cultures which contain some fibroblasts or endothelial cells, the non-muscle cells are not stained with the actin antibody even when the reactions are carried out at 37° C for 1 h or after glycerination. Prefusion skeletal muscle myoblasts also do not stain with this antibody.
It is concluded that the actin antibody described in this report is directed against a particular sequence of amino acids in muscle actin which is not homologous with non-muscle actin. The usefulness of this antibody in determining the origin of cells in certain pathological conditions such as atherosclerosis is discussed.
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This work was supported by the Life Insurance Medical Research Fund of Australia and New Zealand, the National Heart Foundation of Australia, the Deutsche Forschungsgemeinschaft and the Wellcome Trust (London). We thank Janet D. McConnell for excellent technical assistance
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Chamley, J.H., Gröschel-Stewart, U., Campbell, G.R. et al. Distinction between smooth muscle, fibroblasts and endothelial cells in culture by the use of fluoresceinated antibodies against smooth muscle actin. Cell Tissue Res. 177, 445–457 (1977). https://doi.org/10.1007/BF00220606
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DOI: https://doi.org/10.1007/BF00220606