Histone H1-mediated transfection: role of calcium in the cellular uptake and intracellular fate of H1-DNA complexes

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Item Type:	Article
Title:	Histone H1-mediated transfection: role of calcium in the cellular uptake and intracellular fate of H1-DNA complexes
Creators Name:	Zaitsev, S., Buchwalow, I., Haberland, A., Tkachuk, S., Zaitseva, I., Haller, H. and Boettger, M.
Abstract:	Previously, we have shown that the transgene expression in the endothelial cell line ECV 304 strongly depends on the presence of low concentrations of Ca(2+). However, it remained unclear, which transfection steps are controlled by Ca(2+) ions. In the present study, we constructed transfection complexes of digoxigenin-labelled DNA and FITC-labelled histone H1. We monitored the pathway of these complexes with the use of anti-digoxigenin and anti-cathepsin B antibodies and immunofluorescence microscopy. Double labelling of DNA and cathepsin B permitted the localization of transfection complexes into endosomes/lysosomes which suggests an uptake of transfection complexes via endocytosis. It was also found that the uptake of transfection complexes by the cells was independent of the presence or absence of Ca(2+) ions in the transfection medium. On the other hand, the presence of Ca(2+) in the transfection medium dramatically changed the composition of the transfection complexes inside the endosome/lysosome compartment, which resulted in a strong reduction of H1 binding to DNA. Presence of Ca(2+) in the postincubation medium for 24 h resulted in release of the transfection complexes with reduced H1 content from the endosomes/lysosomes into the cytosol. In the absence of Ca(2+) the transfection complexes practically disappeared. These results allow us to come to the following conclusions: Ca(2+) ions control the reorganization of the transfection complexes in endosomes/lysosomes and their release into the cytosol, which is an important prerequisite for transgene expression, whereas uptake of transfection complexes by the cells is not dependent on Ca(2+).
Keywords:	Calcium, Endocytosis, H1-mediated Transfection, Immunocytochemistry, Lysosomal Release, Animals, Cattle
Source:	Acta Histochemica
ISSN:	0065-1281
Publisher:	Fischer
Volume:	104
Number:	1
Page Range:	85-92
Date:	2002
Official Publication:	https://doi.org/10.1078/0065-1281-00633
PubMed:	View item in PubMed

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