Treatment with a soluble receptor for activin improves bone mass and structure in the axial and appendicular skeleton of female cynomolgus macaques (Macaca fascicularis)

Roberto José Fajardo, Rajaram K. Manoharan, R. Scott Pearsall, Monique V. Davies, Tod Marvell, Travis E. Monnell, Jeffrey A. Ucran, Amelia E. Pearsall, Deepali Khanzode, Ravindra Kumar, Kathryn W. Underwood, Benjamin Roberts, Jasbir Seehra, Mary L. Bouxsein

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

A recent study suggests that activin inhibits bone matrix mineralization, whereas treatment of mice with a soluble form of the activin type IIA receptor markedly increases bone mass and strength. To further extend these observations, we determined the skeletal effects of inhibiting activin signaling through the ActRIIA receptor in a large animal model with a hormonal profile and bone metabolism similar to humans. Ten female cynomolgus monkeys (Macaca fascicularis) were divided into two weight-matched groups and treated biweekly, for 3 months, with either a subcutaneous injection 10 mg/kg of a soluble form of the ActRIIA receptor fused with the Fc portion of human IgG1 (ACE-011) or vehicle (VEH). Bone mineral density (BMD), micro-architecture, compressive mechanical properties, and ash fraction were assessed at the end of the treatment period. BMD was significantly higher in ACE-011 treated individuals compared to VEH: + 13% (p = 0.003) in the 5th lumbar vertebral body and + 15% (p = 0.05) in the distal femur. In addition, trabecular volumetric bone density at the distal femur was 72% (p = 0.0004) higher than the VEH-treated group. Monkeys treated with ACE-011 also had a significantly higher L5 vertebral body trabecular bone volume (p = 0.002) and compressive mechanical properties. Ash fraction of L4 trabecular bone cores did not differ between groups. These results demonstrate that treatment with a soluble form of ActRIIA (ACE-011) enhances bone mass and bone strength in cynomolgus monkeys, and provide strong rationale for exploring the use of ACE-011 to prevent and/or treat skeletal fragility.

Original languageEnglish (US)
Pages (from-to)64-71
Number of pages8
JournalBone
Volume46
Issue number1
DOIs
StatePublished - Jan 1 2010

Keywords

  • Activin inhibition
  • Anabolic agent
  • Bone mass
  • Bone strength
  • Osteoporosis

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Histology

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