title: Trivalent dimethylarsenic compound induces histone H3 phosphorylation and abnormal localization of Aurora B kinase in HepG2 cells.
abstract: Trivalent dimethylarsinous acid [DMA(III)] has been shown to induce mitotic abnormalities, such as centrosome abnormality, multipolar spindles, multipolar division, and aneuploidy, in several cell lines. In order to elucidate the mechanisms underlying these mitotic abnormalities, we investigated DMA(III)-mediated changes in histone H3 phosphorylation and localization of Aurora B kinase, which is a key molecule in cell mitosis. DMA(III) caused the phosphorylation of histone H3 (ser10) and was distributed predominantly in mitotic cells, especially in prometaphase cells. By contrast, most of the phospho-histone H3 was found to be localized in interphase cells after treatment with inorganic arsenite [iAs(III)], suggesting the involvement of a different pathway in phosphorylation. DMA(III) activated Aurora B kinase and slightly activated ERK MAP kinase. Phosphorylation of histone H3 by DMA(III) was effectively reduced by ZM447439 (Aurora kinase inhibitor) and slightly reduced by U0126 (MEK inhibitor). By contrast, iAs(III)-dependent histone H3 phosphorylation was markedly reduced by U0126. Aurora B kinase is generally localized in the midbody during telophase and plays an important role in cytokinesis. However, in some cells treated with DMA(III), Aurora B was not localized in the midbody of telophase cells. These findings suggested that DMA(III) induced a spindle abnormality, thereby activating the spindle assembly checkpoint (SAC) through the Aurora B kinase pathway. In addition, cytokinesis was not completed because of the abnormal localization of Aurora B kinase by DMA(III), thereby resulting in the generation of multinucleated cells. These results provide insight into the mechanism of arsenic tumorigenesis.
authors.affiliation: Laboratory of Toxicology, Faculty of Pharmaceutical Sciences, Teikyo University, 1091-1 Sagamiko-cho, Sagamihara, Kanagawa 229-0195, Japan. toshi-su@pharm.teikyo-u.ac.jp
authors.forename: Toshihide
authors.initials: T
authors.lastname: Suzuki
authors.forename: Koichi
authors.initials: K
authors.lastname: Miyazaki
authors.forename: Kayoko
authors.initials: K
authors.lastname: Kita
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ochi
mesh_terms: D018053:Arsenites / Q000633:toxicity; D064107:Aurora Kinase B; D064127:Aurora Kinases; D001549:Benzamides / Q000494:pharmacology; D015153:Blotting, Western; D002101:Cacodylic Acid / Q000031:analogs & derivatives* / Q000633:toxicity; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D018385:Centrosome / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D006657:Histones / Q000378:metabolism*; D006801:Humans; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008940:Mitotic Index; D010766:Phosphorylation / Q000187:drug effects; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D011799:Quinazolines / Q000494:pharmacology; D008941:Spindle Apparatus / Q000187:drug effects
chemical_list: C474722:4-(4-(N-benzoylamino)anilino)-6-methoxy-7-(3-(1-morpholino)propoxy)quinazoline; D018053:Arsenites; D001549:Benzamides; D004791:Enzyme Inhibitors; D006657:Histones; D011799:Quinazolines; C472511:dimethylarsinous acid; D002101:Cacodylic Acid; C576921:AURKB protein, human; D064107:Aurora Kinase B; D064127:Aurora Kinases; D017346:Protein Serine-Threonine Kinases; C015001:arsenite