Osteoclastogenesis is negatively regulated by D-serine produced by osteoblasts

Takeshi Takarada, Mika Takarada-Iemata, Yoshifumi Takahata, Daisuke Yamada, Tomomi Yamamoto, Yukari Nakamura, Eiichi Hinoi, Yukio Yoneda

研究成果: ジャーナルへの寄稿記事

8 引用 (Scopus)


We have shown the functional expression by chondrocytes of serine racemase (SR) which is responsible for the synthesis of D-serine (Ser) from L-Ser in cartilage. In this study, we evaluated the possible functional expression of SR by bone-forming osteoblasts and bone-resorbing osteoclasts. Expression of SR mRNA was seen in osteoblasts localized at the cancellous bone surface in neonatal rat tibial sections and in cultured rat calvarial osteoblasts endowed to release D-Ser into extracellular medium, but not in cultured osteoclasts differentiated from murine bone marrow progenitor cells. Sustained exposure to D-Ser failed to significantly affect alkaline phosphatase activity and Ca 2+ accumulation in cultured osteoblasts, but significantly inhibited differentiation and maturation in a concentration-dependent manner at a concentration range of 0.1-1mM without affecting cellular survival in cultured osteoclasts. By contrast, L-Ser promoted osteoclastic differentiation in a manner sensitive to the inhibition by D-Ser. Matured osteoclasts expressed mRNA for the amino acid transporter B 0,+ (ATB 0,+) and the system alanine, serine, and cysteine amino acid transporter-2 (ASCT2), which are individually capable of similarly incorporating extracellular L- and D-Ser. Knockdown of these transporters by siRNA prevented both the promotion by L-Ser and the inhibition by D-Ser of osteoclastic differentiation in pre-osteoclastic RAW264.7 cells. These results suggest that D-Ser may play a pivotal role in osteoclastogenesis through a mechanism related to the incorporation mediated by both ATB 0,+ and ASCT2 of serine enantiomers in osteoclasts after the synthesis and subsequent release from adjacent osteoblasts. J. Cell. Physiol. 227: 3477-3487, 2012. © 2012 Wiley Periodicals, Inc.

ジャーナルJournal of cellular physiology
出版物ステータス出版済み - 10 1 2012


All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Biochemistry
  • Cell Biology


Takarada, T., Takarada-Iemata, M., Takahata, Y., Yamada, D., Yamamoto, T., Nakamura, Y., ... Yoneda, Y. (2012). Osteoclastogenesis is negatively regulated by D-serine produced by osteoblasts. Journal of cellular physiology, 227(10), 3477-3487. https://doi.org/10.1002/jcp.24048