Expression and Role of Sonic Hedgehog in the Process of Fracture Healing with Aging

Kenichi Matsumoto, Tsuyoshi Shimo, Naito Kurio, Tatsuo Okui, Kyoichi Obata, Masanori Masui, Pai Pang, Yuu Horikiri, Akira Sasaki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Aging is one of the risk factors for delayed fracture healing. Sonic hedgehog (SHH) protein, an inducer of embryonic development, has been demonstrated to be activated in osteoblasts at the dynamic remodeling site of a bone fracture. Herein, we compared and examined the distribution patterns of SHH and the functional effect of SHH signaling on osteogenesis and osteoclastogenesis between young (5-week-old) and aged (60-week-old) mice during fracture healing. We found that SHH was expressed in bone marrow cells from the fractured site of the rib of young mice on day 5, but was barely detectable in the corresponding cells from the rib of aged mice. SHH was also detected in osteoblasts and bone marrow cells at the callus remodeling stage on days 14 and 28 in both young and aged mice. The number of alkaline phosphatase (ALP)-positive osteoblasts was significantly higher in young mice on days 5 and 14, whereas the number of tartrate-resistant acid phosphatase (TRAP)-positive osteoclasts was significantly higher in aged mice. SHH stimulated significantly more osteoblast formation in the young compared to old mice. SHH stimulated the osteoclast formation directly in the aged mice and suppressed the formation indirectly through osteoprotegerin expression in the young mice. Results indicate that an aged-related delay of fracture healing may contribute to the unbalanced bone formation and resorption, regulated by hedgehog signaling.

Original languageEnglish
Pages (from-to)99-105
Number of pages7
JournalIn vivo (Athens, Greece)
Volume30
Issue number2
Publication statusPublished - Mar 1 2016

Keywords

  • Fracture
  • aging
  • osteoblast
  • osteoclast
  • sonic hedgehog

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology

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  • Cite this

    Matsumoto, K., Shimo, T., Kurio, N., Okui, T., Obata, K., Masui, M., Pang, P., Horikiri, Y., & Sasaki, A. (2016). Expression and Role of Sonic Hedgehog in the Process of Fracture Healing with Aging. In vivo (Athens, Greece), 30(2), 99-105.