Targeted delivery system for juxtacrine signaling growth factor based on rhBMP-2-mediated carrier-protein conjugation

Hsia Wei Liu, Chih Hwa Chen, Ching Lin Tsai, Ging Ho Hsiue

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We propose a model of artificial juxtacrine signaling for the controlled release of recombinant human bone morphogenetic protein-2 (rhBMP-2) suitable for guided bone regeneration. A porous three-dimensional scaffold of poly-(lactide-co-glycolide) was fabricated by means of gel molding and particulate leaching. Collagen immobilization onto the scaffold surface was produced by performing photo-induced graft polymerization of acrylic acid, and rhBMP-2 was tethered to the collagenous surface by covalent conjugation. On pharmacokinetic analysis, in vitro enzyme-linked immunosorbent and alkaline phosphatase assays revealed sustained, slow release of rhBMP-2 over 28 days, with a cumulative release of one third of the initial load diffusing out of the scaffold. Conjugation of rhBMP-2 inhibited the free lateral diffusion and internalization of the activated complex of rhBMP-2 and the bone morphogenetic protein receptor. Osteoprogenitor cells were used as bone precursors to determine the expression of biosignaling growth factor in regulating cell proliferation and differentiation. To identify the phenotype of cells seeded on the rhBMP-2-conjugated scaffold, cellular activity was evaluated with scanning electron microscopy and with viability, histological, and immunohistochemical testing. The rhBMP-2-conjugated scaffold prolonged stimulation of intracellular signal proteins in cells. Enhancement of cell growth and differentiation was considered a consequence of juxtacrine signaling transduction. Animal studies of rhBMP-2-containing filling implants showed evidence of resorption and de novo bone formation. The present study revealed the potential of biomimetic constructs with co-immobilized adhesion and growth factors to induce osteoinduction and osteogenesis. Such constructs may be useful as synthetic bone-graft materials in orthopaedic tissue engineering.

Original languageEnglish
Pages (from-to)825-836
Number of pages12
JournalBone
Volume39
Issue number4
DOIs
Publication statusPublished - Oct 2006
Externally publishedYes

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Intercellular Signaling Peptides and Proteins
Carrier Proteins
Osteogenesis
Cell Differentiation
Bone Morphogenetic Protein Receptors
Transplants
Polyglactin 910
Bone and Bones
Immunosorbents
Biomimetics
Bone Regeneration
recombinant human bone morphogenetic protein-2
Tissue Engineering
Polymerization
Immobilization
Electron Scanning Microscopy
Orthopedics
Alkaline Phosphatase
Collagen
Pharmacokinetics

Keywords

  • Conjugation
  • Growth factor
  • Juxtacrine
  • Osteoprogenitor
  • Tissue engineering

ASJC Scopus subject areas

  • Physiology
  • Hematology

Cite this

Targeted delivery system for juxtacrine signaling growth factor based on rhBMP-2-mediated carrier-protein conjugation. / Liu, Hsia Wei; Chen, Chih Hwa; Tsai, Ching Lin; Hsiue, Ging Ho.

In: Bone, Vol. 39, No. 4, 10.2006, p. 825-836.

Research output: Contribution to journalArticle

Liu, Hsia Wei ; Chen, Chih Hwa ; Tsai, Ching Lin ; Hsiue, Ging Ho. / Targeted delivery system for juxtacrine signaling growth factor based on rhBMP-2-mediated carrier-protein conjugation. In: Bone. 2006 ; Vol. 39, No. 4. pp. 825-836.
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