@article{4ab94aea0afe4eafb583f2c57db53522,
title = "Transcription Factor Hematopoietically Expressed Homeobox Protein (Hhex) Negatively Regulates Osteoclast Differentiation by Controlling Cyclin-Dependent Kinase Inhibitors",
abstract = "We investigated the role of hematopoietically expressed homeobox protein (Hhex) in osteoclast development. Trimethylation of lysine 27 of histone H3 at the cis-regulatory element of Hhex was maintained and that of lysine 4 was reduced during receptor activator of nuclear factor κB ligand (RANKL)-induced osteoclastogenesis, which was associated with a reduction of Hhex expression. Overexpression of Hhex in bone marrow–derived macrophages inhibited, whereas Hhex suppression promoted, RANKL-induced osteoclastogenesis in vitro. Conditional deletion of Hhex in osteoclast-lineage cells promoted osteoclastogenesis and reduced cancellous bone volume in mice, confirming the negative regulatory role of Hhex in osteoclast differentiation. Expression of cyclin-dependent kinase inhibitors such as Cdkn2a and Cdkn1b in osteoclast precursors was negatively regulated by Hhex, and Hhex deletion increased the ratio of cells at the G1 phase of the cell cycle. In conclusion, Hhex is an inhibitor of osteoclast differentiation that is regulated in an epigenetic manner and regulates the cell cycle of osteoclast precursors and the skeletal homeostasis.",
keywords = "CELL CYCLE, CYCLIN-DEPENDENT KINASE INHIBITOR, EPIGENETICS, HHEX, OSTEOCLAST",
author = "Hisato Watanabe and Hiroyuki Okada and Jun Hirose and Yasunori Omata and Takumi Matsumoto and Morio Matsumoto and Masaya Nakamura and Taku Saito and Takeshi Miyamoto and Sakae Tanaka",
note = "Funding Information: This work was supported in part by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan to ST (19H05654) and to TM (21 K09316). All the datasets generated in this study are available in the DDBJ Sequence Read Archive (http://trace.ddbj.nig.ac.jp/dra/index_e.html) under the accession numbers DRA006384, DRA007111, and DRA007958. We thank J. Sugita, R. Honma, R. Chijimatsu, (Department of Orthopaedic Surgery, The University of Tokyo), T. Kobayashi, S. Tanigawa, and Y. Sato (Department of Orthopaedic Surgery, The University of Keio) for providing expert technical assistance. We thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript. Authors' roles: HW, HO, YO, JH, TM, MM, MN, TS, TM, and ST conceived experiments. HW, HO, and YO performed experiments. HO performed biocomputing analysis. HW, HO, JH, YO, TM, MM, MN, TS, TM, and ST analyzed the data. HW and ST wrote the paper. All authors read and approved the final manuscript. Funding Information: This work was supported in part by Grants‐in‐Aid from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan to ST (19H05654) and to TM (21 K09316). All the datasets generated in this study are available in the DDBJ Sequence Read Archive ( http://trace.ddbj.nig.ac.jp/dra/index_e.html ) under the accession numbers DRA006384, DRA007111, and DRA007958. We thank J. Sugita, R. Honma, R. Chijimatsu, (Department of Orthopaedic Surgery, The University of Tokyo), T. Kobayashi, S. Tanigawa, and Y. Sato (Department of Orthopaedic Surgery, The University of Keio) for providing expert technical assistance. We thank Edanz Group ( www.edanzediting.com/ac ) for editing a draft of this manuscript. Publisher Copyright: {\textcopyright} 2022 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.",
year = "2022",
month = apr,
doi = "10.1002/jbm4.10608",
language = "English",
volume = "6",
journal = "JBMR Plus",
issn = "2473-4039",
publisher = "Wiley-Blackwell Publishing Ltd",
number = "4",
}
