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Related Concept Videos

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Site-Targeted Drug Delivery Systems: Polymeric Carriers

Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...

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Density Gradient Multilayered Polymerization (DGMP): A Novel Technique for Creating Multi-compartment, Customizable Scaffolds for Tissue Engineering
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Tunable dual growth factor delivery from polyelectrolyte multilayer films.

Nisarg J Shah1, Mara L Macdonald, Yvette M Beben

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Biomaterials
|June 8, 2011
PubMed
Summary

Polyelectrolyte multilayer films deliver controlled amounts of bone and blood vessel growth factors, enhancing bone formation and implant integration. This controlled release strategy improves healing and reduces fracture risk.

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Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery

Published on: August 22, 2016

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Accelerating joint implant integration and reducing recovery time are critical challenges in orthopedic surgery.
  • Controlled delivery of growth factors is essential for maximizing healing efficacy.
  • Polyelectrolyte multilayer (PEM) films offer a promising platform for sustained, controlled release of therapeutic agents.

Purpose of the Study:

  • To develop and characterize PEM films for the controlled, sequential delivery of osteogenic (rhBMP-2) and angiogenic (rhVEGF165) growth factors.
  • To evaluate the efficacy of these dual-growth factor-loaded PEM films in vitro and in vivo for bone regeneration applications.

Main Methods:

  • Fabrication of degradable PEM films using a layer-by-layer (LbL) assembly technique with a [poly(β-amino ester)/polyanion/growth factor/polyanion] tetralayer architecture.
  • Quantification of growth factor loading and assessment of release kinetics over time.
  • In vitro evaluation of growth factor bioactivity using pre-osteoblast and endothelial cell cultures.
  • In vivo assessment of ectopic bone formation and bone quality in a rat model.

Main Results:

  • PEM films successfully sequestered physiological amounts of rhBMP-2 and rhVEGF165, with linear scaling of biologic load with film thickness.
  • Sustained release of rhBMP-2 over 2 weeks and rhVEGF165 over 8 days was achieved without burst release.
  • Both growth factors retained their bioactivity in vitro, promoting osteoblast differentiation and endothelial cell proliferation/migration.
  • In vivo, dual-growth factor PEM films significantly increased ectopic bone mineral density and trabecular thickness compared to rhBMP-2 alone.
  • Enhanced vascularization and more complete scaffold remodeling were observed with the combined growth factor delivery.

Conclusions:

  • Degradable PEM films provide a versatile platform for precisely controlling the spatial and temporal delivery of multiple growth factors.
  • The combined delivery of rhBMP-2 and rhVEGF165 via PEM films significantly enhances bone formation and quality, suggesting improved implant integration and reduced fracture risk.
  • This approach holds promise for various implant applications requiring tailored biological factor release profiles.