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  • Review Article
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Targeting integrins to promote bone formation and repair

Abstract

The ageing skeleton experiences a progressive decline in the rate of bone formation, which can eventually result in osteoporosis—a common disease characterized by reduced bone mass and altered bone microarchitecture which can result in fractures. One emerging therapy involves the identification of molecules that target bone-marrow mesenchymal stromal cells (MSCs) and promote their differentiation into osteoblasts, thereby counteracting bone loss. This Review highlights the discovery that some integrins, a family of heterodimeric transmembrane proteins that can interact with matrix proteins and generate intracellular signals, can be targeted to promote homing of MSCs to bone, osteogenic differentiation and bone formation. Specifically, priming of the α5β1 integrin, which is required for osteoblastic differentiation of MSCs, leads to increased bone formation and improved bone repair in mice. Additionally, treatment with a peptidomimetic ligand of the α4β1 integrin coupled to an agent with a high affinity for bone improves the homing of MSCs to bone and promotes osteoblast differentiation and bone formation, leading to increased bone mass in osteopenic mice. Strategies that target key integrins expressed by MSCs might, therefore, translate into improved therapies for age-related bone loss and possibly other disorders.

Key Points

  • Novel approaches for promoting osteogenic differentiation of mesenchymal stromal cells (MSCs) and improving bone formation and repair need to be developed for the treatment of age-related skeletal disorders

  • Extracellular matrix–integrin interactions control both osteoblastogenesis and bone formation

  • Complexes of integrin-targeted agents associated with an antiosteoporotic agent with high affinity for bone showed improved treatment efficacy in osteopenic mouse models

  • Approaches that target α4β1 and α5β1 integrins may lead to the development of novel strategies to increase bone formation in age-related bone loss and promote repair of non-healing fractures in humans

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Figure 1: Osteoblastogenesis is controlled by integrins.
Figure 2: Integrin-mediated signals that regulate osteoblastogenesis.
Figure 3: Novel integrin-targeted approaches that promote homing of MSCs to bone, osteoblast differentiation, bone formation and repair.

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Acknowledgements

The author's research work discussed in this paper was supported in part by INSERM and University Paris Diderot, the Agence Nationale de la Recherche (grant number ANR-2010-BLAN-1505-01, Integros) and the Fondation de l'Avenir pour la Recherche Appliquée, Paris, France (grant ET9-521). The author thanks Drs G. Tucker and D. Bouvard for their comments, and Z. Saidak for language corrections.

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The author declares that he is an inventor on patent application numbers WO2010015938 (A2) WO2010015938 (A3) and EP2328924 (A2).

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Marie, P. Targeting integrins to promote bone formation and repair. Nat Rev Endocrinol 9, 288–295 (2013). https://doi.org/10.1038/nrendo.2013.4

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