1. The synergy peptide PHSRN and the adhesion peptide RGD mediate cell adhesion through a common mechanism.
- Author
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Feng Y and Mrksich M
- Subjects
- Actin Cytoskeleton chemistry, Actin Cytoskeleton metabolism, Animals, Antibodies immunology, Binding, Competitive, Cricetinae, Fibroblasts chemistry, Fibroblasts drug effects, Fibronectins chemistry, Integrin alphaV drug effects, Integrin alphaV immunology, Integrin alphaV physiology, Integrin beta1 drug effects, Integrin beta1 immunology, Integrin beta1 physiology, Integrins immunology, Integrins physiology, Mice, Oligopeptides chemistry, Peptide Fragments chemistry, Swiss 3T3 Cells, Cell Adhesion, Fibronectins pharmacology, Integrins drug effects, Oligopeptides pharmacology, Peptide Fragments pharmacology
- Abstract
This work reports on the role of the synergy peptide PHSRN in mediating the adhesion of cells. The attachment of baby hamster kidney cells and 3T3 Swiss fibroblasts to model substrates presenting either GRGDS or PHSRN was evaluated using self-assembled monolayers of alkanethiolates on gold presenting the peptide ligands mixed with tri(ethylene glycol) groups. These substrates permit rigorous control over the structures and densities of peptide ligands and at the same time prevent nonspecific interactions with adherent cells. Both cell types attached efficiently to monolayers presenting either the RGD or the PHSRN peptide but not to monolayers presenting scrambled peptide GRDGS or HRPSN. Cell attachment was comparable on substrates presenting either peptide ligand but less efficient than on substrates presenting the protein fibronectin. The degree of cell spreading, however, was substantially higher on substrates presenting RGD relative to PHSRN. Staining of 3T3 fibroblasts with anti-vinculin and phalloidin revealed clear cytoskeletal filaments and focal adhesions for cells attached by way of either RGD or PHSRN. Inhibition experiments showed that the attachment of 3T3 fibroblasts to monolayers presenting RGD could be inhibited completely by a soluble RGD peptide and partially by a soluble PHSRN peptide. IMR 90 fibroblast attachment to monolayers presenting PHSRN could be inhibited with anti-integrin alpha(5) or anti-integrin beta(1) antibody. This work demonstrates unambiguously that PHSRN alone can support the attachment of cells and that the RGD and PHSRN bind competitively to the integrin receptors.
- Published
- 2004
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