Immunolocalization of DMP1 and sclerostin in the epiphyseal trabecule and diaphyseal cortical bone of osteoprotegerin deficient mice

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Author(s)

    • Masuki Hideo
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University|Department of Periodontology and Endodontology, Graduate School of Dental Medicine, Hokkaido University
    • Amizuka Norio
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University
    • Li Minqi
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University
    • Hasegawa Tomoka
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University
    • Suzuki Reiko
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University
    • Ying Guo
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University|Department of Periodontology and Endodontology, Graduate School of Dental Medicine, Hokkaido University
    • Zhusheng Liu
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University
    • Oda Kimimitsu
    • Division of Biochemistry, Niigata University Graduate School of Medical and Dental Sciences
    • Yamamoto Tsuneyuki
    • Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University
    • Kawanami Masamitsu
    • Department of Periodontology and Endodontology, Graduate School of Dental Medicine, Hokkaido University

Abstract

In order to define the osteocytic function in accelerated bone remodeling, we examined the distribution of the osteocytic lacunar-canalicular system (OLCS) and osteocyte-secreting molecules-dentin matrix protein (DMP) 1 and sclerostin-in the epiphyses and cortical bones of osteoprotegerin deficient (OPG<SUP>-/-</SUP>) mice. Silver impregnation visualized a well-arranged OLCS in the wild-type epiphyses and cortical bone, whereas OPG<SUP>-/-</SUP> mice had an irregular OLCS in the epiphyses, but well-arranged canaliculi in the cortical bone. DMP1-positive osteocytes were evenly distributed throughout the wild-type epiphyses and cortical bone, as well as the OPG<SUP>-/-</SUP> cortical bone. However, OPG<SUP>-/-</SUP> epiphyses revealed weak DMP1-immunoreactivity. Thus, osteocytes appear to synthesize more DMP1 as the OLCS becomes regular. In contrast, sclerostin-immunoreactivity was significantly diminished in the OPG<SUP>-/-</SUP> epiphyses and cortical bone. In OPG<SUP>-/-</SUP> epiphyses and cortical bone, triple staining demonstrated few sclerostin-positive osteocytes in the periphery of a thick cell layer of alkaline phosphatase-positive osteoblasts and many tartrate resistant acid phosphatasepositive osteoclasts. Summarizing, the regular distribution of OLCS may affect DMP1 synthesis, while the cellular activities of osteoclasts and osteoblasts rather than the regularity of OLCS may ultimately influence sclerostin synthesis.

Journal

  • Biomedical Research

    Biomedical Research 31(5), 307-318, 2010

    Biomedical Research Press

Codes

  • NII Article ID (NAID)
    130004903810
  • NII NACSIS-CAT ID (NCID)
    AA00110128
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    0388-6107
  • Data Source
    IR  J-STAGE 
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