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Global morphogenesis regulating tissue architecture and organogenesis.

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Recombinant bone morphogenetic proteins (hBMPs) and transforming growth factor-β3 (hTGF-β3) can induce bone by recapitulating embryonic development in heterotopic sites. However, they fail in orthotopic sites due to a lack of developmental pathways, hindering clinical translation.

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Bone inductionBone morphogenetic proteinsCell engineeringDevelopmental vs. endochondral osteogenesisHuman osteoinductionLack of clinical translationTransforming growth factor-β proteins

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Area of Science:

  • Biotechnology
  • Developmental Biology
  • Regenerative Medicine

Background:

  • Recombinant human bone morphogenetic proteins (hBMPs) and transforming growth factor-β3 (hTGF-β3) are investigated for their bone-inducing capabilities.
  • Bone formation is a complex process involving mesenchymal and endochondral osteogenesis, recapitulating embryonic development.

Purpose of the Study:

  • To propose that successful bone induction by hBMPs and hTGF-β3 relies on recapitulating embryonic development.
  • To explain the failure of hBMP-2, hBMP-7, and hTGF-β3 in orthotopic human mandibular defects due to a lack of this developmental recapitulation.

Main Methods:

  • This perspective article reviews existing biological and clinical data on recombinant morphogen-induced bone formation.
  • It contrasts bone induction in heterotopic versus orthotopic sites, focusing on developmental pathways.

Main Results:

  • Heterotopic bone formation induced by hBMPs and hTGF-β3 successfully recapitulates embryonic development, initiating with cartilage anlagen and vascular invasion.
  • Orthotopic implantation of hBMP-2, hBMP-7, and hTGF-β3 in human mandibular defects fails to induce significant bone formation.
  • This failure is attributed to the absence of the necessary embryonic developmental platform in orthotopic sites.

Conclusions:

  • The "bone induction principle" is clinically translatable only when recombinant morphogens induce bone via recapitulation of embryonic development.
  • Successful bone regeneration in orthotopic sites requires a biological environment that supports embryonic developmental pathways, which are lacking in current clinical applications.