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- W2023585384 abstract "The aim of this study was to provide morphological evidence for the presence of rho A protein in developing cardiomyocytes and to investigate its possible role in myofibrillogenesis. Immunostaining with a monoclonal anti-rho antibody gave a diffuse pattern in the cytosol of cultured cardiomyocytes. Introduction of C3 exoenzyme into the cells by electroporation was used to inactivate rho A protein by ADP-ribosylation. An immunostaining with anti-vinculin, anti-talin, and anti-integrin antibodies showed the focal adhesions in electroporation control cardiomyocytes to be evenly distributed in the ventral sarcolemma; the costameric structure was also detected using these antibodies. In contrast, in C3 exoenzyme treated cells, focal adhesions were disassembled and costamere were absent; in addition, beta-actin-positive, non-striated fibrils were lost and assembly of M-protein, titin, and alpha-actinin into myofibrils was poor, as shown by diffuse and filamentous staining pattern. C3 exoenzyme treatment had a less marked effect on mature cardiomyocytes than on immature cells; in this case, cells became distorted and few myofibrils were seen. The intensity of anti-phosphotyrosine antibody staining of the focal adhesion was also decreased or diffuse in C3 exoenzyme-treated cardiomyocytes, suggesting dephosphorylation of focal adhesion components. We therefore conclude that small G protein rho A plays an important role in myofibril assembly in cardiomyocytes." @default.
- W2023585384 created "2016-06-24" @default.
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- W2023585384 date "1997-07-01" @default.
- W2023585384 modified "2023-10-09" @default.
- W2023585384 title "Studies on the function of Rho A protein in cardiac myofibrillogenesis" @default.
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- W2023585384 doi "https://doi.org/10.1002/(sici)1097-4644(19970701)66:1<43::aid-jcb6>3.0.co;2-y" @default.
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