Improved bone morphogenetic protein-2 retention in an injectable collagen matrix using bifunctional peptides.
To promote healing of many orthopedic injuries, tissue engineering approaches are being developed that combine growth factors such as Bone Morphogenetic Proteins (BMP) with biomaterial carriers. Although these technologies have shown great promise, they still face limitations. We describe a generalized approach to create target-specific modular peptides that bind growth factors to implantable biomaterials. These bifunctional peptide coatings provide a novel way to modulate biology on the surface of an implant. Using phage display techniques, we have identified peptides that bind with high affinity to BMP-2. The peptides that bind to BMP-2 fall into two different sequence clusters. The first cluster of peptide sequences contains the motif W-X-X-F-X-X-L (where X can be any amino acid) and the second cluster contains the motif F-P-L-K-G. We have synthesized bifunctional peptide linkers that contain BMP-2 and collagen-binding domains. Using a rat ectopic bone formation model, we have injected rhBMP-2 into a collagen matrix with or without a bifunctional BMP-2: collagen peptide (BC-1). The presence of BC-1 significantly increased osteogenic cellular activity, the area of bone formed, and bone maturity at the site of injection. Our results suggest that bifunctional peptides that can simultaneously bind to a growth factor and an implantable biomaterial can be used to control the delivery and release of growth factors at the site of implantation.
Department of Microbiology, North Carolina State University, Raleigh, North Carolina, United States of America.
Paul T
PT
Hamilton
Michelle S
MS
Jansen
Sathya
S
Ganesan
R Edward
RE
Benson
Robin
R
Hyde-Deruyscher
Wayne F
WF
Beyer
Joseph C
JC
Gile
Shrikumar A
SA
Nair
Jonathan A
JA
Hodges
Hanne
H
Grøn
D000595:Amino Acid Sequence; D000818:Animals; D001672:Biocompatible Materials / Q000008:administration & dosage / Q000737:chemistry* / Q000378:metabolism; D055396:Bone Morphogenetic Protein 2 / Q000008:administration & dosage* / Q000378:metabolism / Q000494:pharmacology*; D003094:Collagen / Q000008:administration & dosage / Q000737:chemistry* / Q000378:metabolism; D007267:Injections; D008297:Male; D008969:Molecular Sequence Data; D010012:Osteogenesis / Q000187:drug effects; D019151:Peptide Library; D010455:Peptides / Q000008:administration & dosage / Q000737:chemistry* / Q000378:metabolism; D011485:Protein Binding; D051381:Rats; D017207:Rats, Sprague-Dawley
D001672:Biocompatible Materials; D055396:Bone Morphogenetic Protein 2; D019151:Peptide Library; D010455:Peptides; D003094:Collagen