Abstract
Histone deacetylase (HDI) inhibitors have antiproliferative properties and are promising agents of combined anticancer therapy. Previously, we have shown that sodium butyrate (NaBut), a member of the HDI family, does not independently induce double-strand breaks in DNA (DB-DNA), but, like genotoxic agents, it initiates the accumulation of H2AX phosphorylated histone (γH2AX), which is a marker of DB-DNA. HDI can also reduce the repair efficiency of DNA damaged by genotoxic agents in transformed cells. The goal of this work was to identify the signaling pathways facilitated the accumulation of γH2AX under the action of HDI in transformed cells. To this end, the role of MAPK family in NaBut-induced phosphorylation of H2AX histone, as well as in the inhibition of DNA repair, was studied. We have shown that the accumulation of γH2AX in transformed cells in response to the action of NaBut is accompanied by a reduced phosphorylation level of ERK and PKB/Akt kinases. The activating phosphorylation of p38 kinase increases under the action of NaBut and, as a result, Wip1 phosphatase accumulates, which is a probable cause of inhibition of DNA repair. At the same time, suppression of p38 kinase activity abolishes the NaBut-induced decrease in repair efficiency. Our findings concerning the abolition of the negative effect of NaBut on DNA repair upon inhibition of p38 MAP kinase, as well as data on the accumulation of Wip1 phosphatase under the action of NaBut, suggest that the p38/Wip1 pathway is involved in the NaBut-induced decrease in repair efficiency in transformed cells.
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This work was financially supported by the Russian Science Foundation (project no. 22-25-20229) and the St. Petersburg Science Foundation in accordance with agreement no. 05/2022 dated April 13, 2022.
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Translated by I. Fridlyanskaya
Abbreviations: DB—double-strand breaks; HDI—histone deacetylase inhibitor; DNA-PK—DNA-dependent protein kinase; NaBut—sodium butyrate.
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Gnedina, O.O., Morshneva, A.V. & Igotti, M.V. The Function of MAP Kinases in Induced Histone H2AX Phosphorylation in Transformed Cells. Cell Tiss. Biol. 17, 247–255 (2023). https://doi.org/10.1134/S1990519X23030045
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DOI: https://doi.org/10.1134/S1990519X23030045