Abstract
Since RGD peptides (R: arginine; G: glycine; D: aspartic acid) are found to
promote cell adhesion, they are modified at numerous materials surface for medical
applications such as drug delivery and regenerative medicine. Peptide-cell surface
interactions play a key role in the above applications. In this letter, we study the
adhesion force between the RGD-coated bead and Hela cell surface by optical tweezes.
The adhesion is dominated by the binding of α<sub>5</sub>β<sub>1</sub> and RGD-peptide with
higher adhesion probability and stronger adhesion strength compared with the
adhesion of bare bead and cell surface. The binding force for a single
α<sub>5</sub>β<sub>1</sub>-GRGDSP pair is determined to be 16.8 pN at a loading rate of 1.5 nN/s.
The unstressed off-rate is 1.65 × 10<sup>-2</sup> s<sup>-1</sup> and the distance of transition state
for the rigid binding model is 3.0 nm.
© 2012 Chinese Optics Letters
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