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Steroid and xenobiotic receptor mediates a novel vitamin K2 signaling pathway in osteoblastic cells

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Abstract

The nuclear receptor steroid and xenobiotic receptor (SXR) is a transcriptional regulator activated by various biological and xenobiotic substances. We have recently shown that SXR is expressed in bone and that this receptor is critical for bone metabolism, particularly in osteoblastic cells. Vitamin K2, one of the critical nutrients in bone metabolism, has been demonstrated that it is a potent SXR agonist and modulates the expression of various bone-related genes in osteoblastic cells. Using microarray analysis, we identified novel SXR target genes that were activated by vitamin K2 in osteoblastic cells. Among them, a small leucine-rich repeat proteoglycan, tsukushi, has been shown to contribute to collagen accumulation, and the protein may interact with another vitamin K2-inducible SXR target, matrilin-2, a member of the matrilin family that functions as collagen adaptors. Besides functioning as a xenobiotic biosensor, our findings show that SXR is also a vitamin K2 target and an important transcriptional factor that regulates bone homeostasis in bone cells.

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Authors and Affiliations

  1. Division of Gene Regulation and Signal Transduction, Research Center for Genomic Medicine, Saitama Medical School, Saitama, Japan

    Kuniko Horie-Inoue & Satoshi Inoue

  2. Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    Satoshi Inoue

Authors
  1. Kuniko Horie-Inoue
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  2. Satoshi Inoue
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Correspondence to Satoshi Inoue.

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S. Inoue is a recipient of the JSBMR Academic Award 2006.

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Horie-Inoue, K., Inoue, S. Steroid and xenobiotic receptor mediates a novel vitamin K2 signaling pathway in osteoblastic cells. J Bone Miner Metab 26, 9–12 (2008). https://doi.org/10.1007/s00774-007-0792-6

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  • DOI: https://doi.org/10.1007/s00774-007-0792-6

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