A tetravalent RGD ligand for integrin-mediated cell adhesion

Monovalent RGD (arginine‐glycine‐aspartic acid) peptides or polymers furnished with RGD in random distributions are employed as cell‐scaffolds and gene delivery vehicles. However, integrin binding to RGD is dependent on the spatial distribution (clustering) of the ligand and intrinsic integrin affin...

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Bibliographic Details
Published in:Journal of pharmacy and pharmacology 2006-07, Vol.58 (7), p.959-966
Main Authors: Watson, N., Duncan, G., Annan, W. S., van der Walle, C. F.
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Cell Adhesion - drug effects
Circular Dichroism
Cloning, Molecular
Electrophoresis, Polyacrylamide Gel
Escherichia coli - genetics
Fibroblasts - cytology
Fibroblasts - drug effects
HeLa Cells
Humans
Integrins
Ligands
Mice
Molecular Sequence Data
Oligopeptides - chemistry
Oligopeptides - genetics
Oligopeptides - pharmacology
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Summary:Monovalent RGD (arginine‐glycine‐aspartic acid) peptides or polymers furnished with RGD in random distributions are employed as cell‐scaffolds and gene delivery vehicles. However, integrin binding to RGD is dependent on the spatial distribution (clustering) of the ligand and intrinsic integrin affinity via conformational changes (avidity). Here we have designed and expressed a polypeptide consisting of a tetrameric coiled coil and spacer facilitating polyvalent (clustered) display of integrin ligands; the RGD motif was used as proof of principle. Size‐exclusion chromatography and circular dichroism showed that the polypeptide self assembled as a tetramer in solution with a defined secondary structure. Cell adhesion to surfaces coated with the polypeptide was up to 3‐fold greater than that for (monovalent) RGDS peptide at equivalent concentrations. Moreover, the polypeptide in solution at concentrations ≥1μM inhibited cell adhesion to fibronectin‐coated surfaces, while RGDS peptide in solution at concentrations up to 500μM did not. These cell data demonstrate that the polypeptide bound integrin receptors in a polyvalent manner. The polypeptide will therefore be of use in the engineering of tissue‐culture scaffolds with increased cell adhesion activity, or to targeted gene delivery vehicles, and could incorporate protein ligands in place of the RGD motif.
ISSN:0022-3573
2042-7158
DOI:10.1211/jpp.58.7.0011