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Alpha smooth muscle actin distribution in cytoplasm and nuclear invaginations of connective tissue fibroblasts

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Abstract

Alpha smooth muscle actin (α-SMA) was recently shown to be present in mouse subcutaneous tissue fibroblasts in the absence of tissue injury. In this study, we used a combination of immunohistochemistry and correlative confocal scanning laser and electron microscopy to investigate the structural organization of α-SMA in relation to the nucleus. Furthermore, we explored colocalization analysis as a method for quantifying the amount of α-SMA in close approximation to the nucleic acid marker, 4′,6-diamidino-2-phenyl-indole, dihydrochloride. Our findings indicate the presence of α-SMA within nuclear invaginations in close proximity to the nuclear membrane, but not in the nucleoplasm. Although the function of these α-SMA-rich nuclear invaginations is at present unknown, the morphology of these structures suggests their possible involvement in cellular and nuclear mechanotransduction as well as nuclear transport.

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Acknowledgments

The authors thank Dr Michael J. Hendzel and Alan K. Howe for helpful discussions. This work was funded by the NIH Center for Complementary and Alternative Medicine. Research Grant RO1-AT01121 and by NIH Grant P20 RR16435 from the COBRE Program of the National Center for Research Resources. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the National Center for Complementary and Alternative Medicine, National Institutes of Health.

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Correspondence to Helene M. Langevin.

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Storch, K.N., Taatjes, D.J., Bouffard, N.A. et al. Alpha smooth muscle actin distribution in cytoplasm and nuclear invaginations of connective tissue fibroblasts. Histochem Cell Biol 127, 523–530 (2007). https://doi.org/10.1007/s00418-007-0275-9

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  • DOI: https://doi.org/10.1007/s00418-007-0275-9

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