Summary
The organization of the cytoskeletal proteins, alpha-actinin, vinculin and desmin, was studied in new-born hamster cardiomyocytes in vitro by immunofluorescent microscopy. Since there have been indications that the in vitro organization of certain cytoskeletal elements of cardiomyocytes is not the same as in vivo, the studies were designed to examine the reorganization of these proteins in cultured cells. The observations concentrated on three proteins that are known to be associated in vivo with myofibrillar Z-lines. Beginning at 2 days in culture, and during subsequent days, the proteins examined underwent substantial redistributions before they reorganized back to their associations with the myofibrillar Z-lines. The pattern and time course for these redistributions were characteristic for each protein. Alpha-actinin was the first to return to its typical location at the level of the Z-lines during the second day in culture, followed by desmin at 4 days. Vinculin usually did not become associated with the Z-lines until 6 days in vitro. In the present study, analyses of the distributions and redistributions of particular proteins in the cultured cardiomyocytes have been useful for helping to identify changes in the myocyte as a result of isolation and culture conditions. In addition, a better understanding of the temporal and spatial relationships between cytoskeletal proteins assembling into the Z-line area has been gained.
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Osinska, H.E., Lemanski, L.F. Immunofluorescent studies on Z-line-associated protein in cultured cardiomyocytes from neonatal hamsters. Cell Tissue Res 271, 59–67 (1993). https://doi.org/10.1007/BF00297541
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DOI: https://doi.org/10.1007/BF00297541