Abstract
Inhibition of cellular growth of silver nitrate was tested in two different mammalian cell lines: in HaCaT keratinocyte and K562 erythroleukemia cell cultures resulting in 6.4 and 3.5 µM AgNO3 MIC50 values, respectively. Fluorescent microscopic visualization of large-scale chromatin structures revealed that after AgNO3 treatment at low concentrations (<1 µM), regarded earlier as subtoxic levels, chromatin changes were early signs of cytotoxicity especially with K562 cells. Typical nuclear changes induced by silver nitrate involved (a) the polarization of precondensed and the extrusion of decondensed chromatin seen as chromatin tails, (b) the tail (“comet”) formation was dependent on silver nitrate concentration, (c) K562 erythroleukemia cells were more susceptible to silver nitrate (0.5–5 µM) treatment, than HaCaT cells, (d) elevated silver nitrate concentrations (10–15 µM) caused nuclear shrinking with an infrequent formation of apoptotic bodies, (e) higher Ag+ concentrations (20–50 µM) allowed the expansion of the nuclear material without necrotic disruptions. The chromatin tail formation could be accounted for by a decrease in chromatin supercoiling related to a dose dependent reduction of ATP content, cell viability and increased production of reactive oxygen species.
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This work was supported by Hungarian Scientific Research Fund (OTKA grant) T 42762 grant to G.B.
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Nagy, G., Turáni, M., Kovács, K., Bánfalvi, G. (2011). Chromatin Changes upon Silver Nitrate Treatment in Human Keratinocyte HaCaT and K562 Erythroleukemia Cells. In: Banfalvi, G. (eds) Cellular Effects of Heavy Metals. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0428-2_9
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DOI: https://doi.org/10.1007/978-94-007-0428-2_9
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