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Silver and Histone Modifications

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Handbook of Nutrition, Diet, and Epigenetics
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Abstract

Silver (Ag) is used in a wide range of industries due to its antibacterial properties. The daily intake of Ag from the diet is estimated to be approximately 7 μg per person, and this is predicted to increase due to artificial treatments in food production chains and drinking water. Colloidal Ag and nano-sized Ag (AgNPs) have recently been used in dietary supplements and food packaging materials, respectively, and concerns have been raised over their safety. Ag is regarded as a safe metal; however, in vitro experiments recently revealed the genotoxicity of AgNPs. The toxic effects of AgNPs have mainly been attributed to the binding of released Ag ions with functional proteins and the formation of reactive oxygen species. Post-translational modifications in histones have been linked to a number of biological and toxicological processes as well as diseases, and carcinogenic metals are known to alter histone modifications, leading to changes in gene expression. Although few Ag-induced histone modifications have been reported to date, we demonstrated that AgNPs induced the phosphorylation of histone H2AX at serine 139 based on DNA damage and the phosphorylation of histone H3 at serine 10. In this review, these histone modifications are mainly introduced with other related modifications. Histone modifications have been suggested to change the chromatin structure, followed by alterations in the formation and repair of DNA damage. These changes may play a role in the enhanced genotoxicity and carcinogenicity of Ag when it is coexposed with other genotoxic factors.

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Abbreviations

DSBs:

Double-strand breaks

GSH:

Glutathione

HDACs:

Histone deacetylases

HDACI:

HDAC inhibitor

AgNPs:

Nano-sized Ag

NOAEL:

No observable adverse effect level

γ-H2AX:

Phosphorylation of histone H2AX

p-H3S10:

Phosphorylation of histone H3 at serine 10

ROS:

Reactive oxygen species

Ag:

Silver

SB:

Sodium butyrate

UV:

Ultraviolet

WHO:

World Health Organization

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Correspondence to Yuko Ibuki .

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© 2019 Springer Nature Switzerland AG

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Ibuki, Y. (2019). Silver and Histone Modifications. In: Patel, V., Preedy, V. (eds) Handbook of Nutrition, Diet, and Epigenetics. Springer, Cham. https://doi.org/10.1007/978-3-319-55530-0_74

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  • DOI: https://doi.org/10.1007/978-3-319-55530-0_74

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-55529-4

  • Online ISBN: 978-3-319-55530-0

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