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Growth factor delivery through self-assembling peptide scaffolds.

Rachel E Miller1, Paul W Kopesky, Alan J Grodzinsky

  • 1Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, NE47-377, Cambridge, MA 02139, USA.

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Tethering growth factors like IGF-1 to peptide scaffolds for cartilage tissue engineering offers long-term delivery but does not enhance cell activity. Effective protein presentation is key for bioactivity.

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Area of Science:

  • Biomaterials science
  • Tissue engineering
  • Cell biology

Background:

  • Developing effective strategies for delivering growth factors to cells for cartilage tissue engineering is a significant challenge.
  • Previous research demonstrated successful delivery of biotinylated insulin-like growth factor-1 (bIGF-1) to cardiac tissue using a self-assembling peptide scaffold (RADA)(4).

Purpose of the Study:

  • To investigate if soluble bIGF-1 stimulates proteoglycan production in chondrocytes.
  • To determine if bIGF-1 can be adsorbed or tethered to the (KLDL)(3) self-assembling peptide scaffold.
  • To assess if adsorbed or tethered bIGF-1 or transforming growth factor-β1 (TGF-β1) stimulates proteoglycan production by bone marrow stromal cells (BMSCs).

Main Methods:

  • Chondrocytes and BMSCs were encapsulated within the (KLDL)(3) scaffold.
  • Growth factors (bIGF-1, TGF-β1) were administered solubly, adsorbed, or tethered to the scaffold via biotin-streptavidin bonds.
  • IGF-1 kinetics were tracked using fluorescent streptavidin; sulfated glycosaminoglycan (sGAG) and DNA content were measured.

Main Results:

  • Soluble bIGF-1 and IGF-1 similarly increased sGAG accumulation.
  • Tethering bIGF-1 to (KLDL)(3) improved its retention compared to adsorption, but neither method enhanced sGAG or DNA levels over controls.
  • Adsorption of TGF-β1 increased proteoglycan accumulation, while tethering did not significantly alter sGAG levels.

Conclusions:

  • TGF-β1 can be effectively delivered via adsorption to the (KLDL)(3) scaffold, but IGF-1 cannot.
  • Tethering growth factors to the (KLDL)(3) scaffold facilitates long-term sequestration but does not necessarily yield enhanced bioactivity compared to soluble delivery.
  • The presentation of proteins is a critical factor in designing effective growth factor delivery strategies for tissue engineering.