Teriparatide (1-34 human PTH) regulation of osterix during fracture repair

Lee A. Kaback, Do Y. Soung, Amish Naik, Graziello Geneau, Edward M. Schwarz, Randy N. Rosier, Regis J. O'Keefe, Hicham Drissi

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66 Scopus citations

Abstract

Based on remarkable success of PTH as an anabolic drug for osteoporosis, case reports of off-label use of teriparatide (1-34 PTH) in patients with complicated fractures and non-unions are emerging. We investigated the mechanisms underlying PTH accelerated fracture repair. Bone marrow cells from 7 days 40 μg/kg of teriparatide treated or saline control mice were cultured and Osx and osteoblast phenotypic gene expression assessed by real-time RT-PCR in these cells. Fractured animals injected daily with either saline or 40 μg/kg of teriparatide for up to 21 days were X-rayed and histological assessment performed, as well as immunohistochemical analyses of the Osx expression in the fracture callus. Osx, Runx2 and osteoblast or chondrocyte phenotypic gene expression was also assessed in fracture calluses. Our data shows that Osx and Runx2 are up-regulated in marrow-derived MSCs isolated from mice systemically treated with teriparatide. Furthermore, these MSCs undergo accelerated osteoblast maturation compared to saline injected controls. Systemic teriparatide treatments also accelerated fracture healing in these mice concomitantly with increased Osx expression in the PTH treated fracture calluses compared to controls. Collectively, these data suggest a mechanism for teriparatide mediated fracture healing possibly via Osx induction in MSCs.

Original languageEnglish
Pages (from-to)219-226
Number of pages8
JournalJournal of cellular biochemistry
Volume105
Issue number1
DOIs
StatePublished - Sep 1 2008
Externally publishedYes

Keywords

  • Fractures
  • Osterix/SP7
  • PTH
  • Runx2
  • Teriparatide

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    Kaback, L. A., Soung, D. Y., Naik, A., Geneau, G., Schwarz, E. M., Rosier, R. N., O'Keefe, R. J., & Drissi, H. (2008). Teriparatide (1-34 human PTH) regulation of osterix during fracture repair. Journal of cellular biochemistry, 105(1), 219-226. https://doi.org/10.1002/jcb.21816