Abstract
Hat1 was the first histone acetyltransferase identified; however, its biological function is still unclear. In this report, it is shown for the first time that human Hat1 has two isoforms. Isoform a has 418 amino acids (aa) and is localized exclusively in the nuclear matrix of normal human keratinocytes (NHKs). Isoform b has 334 aa and is located in the cytoplasm, the nucleoplasm, attached to the chromatin and to the nuclear matrix. Immunohistochemical analyses revealed that the bulk of Hat1 is confined to the nucleus, with much lesser amounts in the cytoplasm. Cells undergoing mitotic division have an elevated amount of Hat1 compared to those that are non-mitotic. Senescent cells, however, exhibit a higher concentration of Hat1 in the cytoplasm compare to proliferating cells and the amount of Hat1 in the nucleus decreases with the progression of senescence. NHKs exposed to hydrogen peroxide (H2O2) or to a beam of high mass and energy ion particles displayed bright nuclear staining for Hat1, a phenotype that was not observed in NHKs exposed to γ-rays. We established that the enhanced nuclear staining for Hat1 in response to these treatments is regulated by the PI3K and the mitogen-activated protein kinase signaling pathways. Our observations clearly implicate Hat1 in the cellular response assuring the survival of the treated cells.
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Acknowledgments
We would like to thank Avril Woodhead for her critical help with the manuscript preparation; Dr. Rolf Sternglanz and Dr. Carl Andersen for their critical reading of the manuscript; Dr. John Sutherland and John Trunk for the Western Blotting detection system; Drs. Adam Rusek, Michael Sivertz, Peter Guida and the entire BNL Medical Department support staff for the invaluable help with these experiments; Dr. Jean Underwood, and Dr. Jeffrey A. Nickerson for sharing protocols for matrix isolation and Dr. Betsy Sutherland for her support of the entire project. This study was supported by a grant from the National Aeronautics and Space Administration NNJ08HB63I under Department of Energy Prime Contract DE-AC02-98CH10886 with the Brookhaven National Laboratory (to S.T.T.) and from the Federal Ministry of Education and Research BMBF 02S8497 (to P.B.).
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Lebel, E.A., Boukamp, P. & Tafrov, S.T. Irradiation with heavy-ion particles changes the cellular distribution of human histone acetyltransferase HAT1. Mol Cell Biochem 339, 271–284 (2010). https://doi.org/10.1007/s11010-010-0390-0
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DOI: https://doi.org/10.1007/s11010-010-0390-0