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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Arya H, Kaul Z, Wadhwa R, Taira K, Hirano T, Kaul SC (2005) Quantum dots in bio-imaging: revolution by the small. Biochem Biophys Res Commun 329:1173–1177
Bourgeois CA, Hemon D, Bouteille M (1979) Structural relationship between the nucleolus and the nuclear envelope. J Ultrastruct Res 68:328–340
Costes SV, Daelemans D, Cho EH, Dobbin Z, Pavlakis G, Lockett S (2004) Automatic and quantitative measurement of protein–protein colocalization in live cells. Biophys J 86:3993–4003
Crisp M, Liu Q, Roux K, Rattner JB, Shanahan C, Burke B, Stahl PD, Hodzic D (2006) Coupling of the nucleus and cytoplasm: role of the LINC complex. J Cell Biol 172:41–53
Dupuy-Coin AM, Moens P, Bouteille M (1986) Three-dimensional analysis of given cell structures: nucleolus, nucleoskeleton and nuclear inclusions. Methods Achiev Exp Pathol 12:1–25
Fricker M, Hollinshead M, White N, Vaux D (1997) Interphase nuclei of many mammalian cell types contain deep, dynamic, tubular membrane-bound invaginations of the nuclear envelope. J Cell Biol 136:531–544
Giepmans BN, Deerinck TJ, Smarr BL, Jones YZ, Ellisman MH (2005) Correlated light and electron microscopic imaging of multiple endogenous proteins using quantum dots. Nat Methods 2:743–749
Giepmans BN, Adams SR, Ellisman MH, Tsien RY (2006) The fluorescent toolbox for assessing protein location and function. Science 312:217–224
Hu S, Chen J, Butler JP, Wang N (2005) Prestress mediates force propagation into the nucleus. Biochem Biophys Res Commun 329:423–428
Ingber DE (2006) Cellular mechanotransduction: putting all the pieces together again. FASEB J 20:811–827
Johnson N, Krebs M, Boudreau R, Giorgi G, LeGros M, Larabell C (2003) Actin-filled nuclear invaginations indicate degree of cell de-differentiation. Differentiation 71:414–424
Kellenberger E, Durrenberger M, Villiger W, Carlemalm E, Wurtz M (1987) The efficiency of immunolabel on Lowicryl sections compared to theoretical predictions. J Histochem Cytochem 35:959–969
Landmann L, Marbet P (2004) Colocalization analysis yields superior results after image restoration. Microsc Res Tech 64:103–112
Langevin HM, Storch KN, Cipolla MJ, White SL, Buttolph TR, Taatjes DJ (2006) Fibroblast spreading induced by connective tissue stretch involves intracellular redistribution of alpha- and beta-actin. Histochem Cell Biol 125:487–495
Lui PP, Kong SK, Kwok TT, Lee CY (1998) The nucleus of HeLa cell contains tubular structures for Ca2+ signalling. Biochem Biophys Res Commun 247:88–93
Manders EMM, Verbeek FJ, Aten JA (1993) Measurement of colocalization of objects in dual-color confocal images. J Microsc 169:375–382
Maxwell CA, Hendzel MJ (2001) The integration of tissue structure and nuclear function. Biochem Cell Biol 79:267–274
Nisman R, Dellaire G, Ren Y, Li R, Bazett-Jones DP (2004) Application of quantum dots as probes for correlative fluorescence, conventional, and energy-filtered transmission electron microscopy. J Histochem Cytochem 52:13–18
Thomas CH, Collier JH, Sfeir CS, Healy KE (2002) Engineering gene expression and protein synthesis by modulation of nuclear shape. Proc Natl Acad Sci USA 99:1972–1977
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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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