Simulated spaceflight produces a rapid and sustained loss of osteoprogenitors and an acute but transitory rise of osteoclast precursors in two genetic strains of mice

Mohammad Shahnazari, Pam Kurimoto, Benjamin M. Boudignon, Benjamin E. Orwoll, Daniel D. Bikle, Bernard P. Halloran

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Loss of skeletal weight bearing or skeletal unloading as occurs during spaceflight inhibits bone formation and stimulates bone resorption. These are associated with a decline in the osteoblast (Ob.S/BS) and an increase in the osteoclast (Oc.S/BS) bone surfaces. To determine the temporal relationship between changes in the bone cells and their marrow precursor pools during sustained unloading, and whether genetic background influences these relationships, we used the hindlimb unloading model to induce bone loss in two strains of mice known to respond to load and having significantly different cancellous bone volumes (C57BL/6 and DBA/2 male mice). Skeletal unloading caused a progressive decline in bone volume that was accompanied by strain-specific changes in Ob.S/BS and Oc.S/BS. These were associated with a sustained reduction in the osteoprogenitor population and a dramatic but transient increase in the osteoclast precursor pool size in both strains. The results reveal that bone adaptation to skeletal unloading involves similar rapid changes in the osteoblast and osteoclast progenitor populations in both strains of mice but striking differences in Oc.S/BS dynamics, BFR, and cancellous bone structure. These strainspecific differences suggest that genetics plays an important role in determining the osteoblast and osteoclast populations on the bone surface and the dynamics of bone loss in response to skeletal unloading.

Original languageEnglish (US)
Pages (from-to)E1354-E1362
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume303
Issue number11
DOIs
StatePublished - Dec 1 2012
Externally publishedYes

Keywords

  • Bone loss
  • Bone remodeling
  • Osteoblast
  • Osteoclast
  • Skeletal unloading

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)

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