Coating of surfaces by RGD peptides is well-known. Herein we describe the possibility to switch cell adhesion properties by changing the distance and orientation of the RGD peptides to the surface. A set of RGD peptides of the type cyclo(-RGDfK-) was synthesized containing the photoswitchable 4-[(4-aminophenyl)azo]benzocarbonyl central unit as spacer between the acrylamide anchor and the RGD pe...

We report on the formation of hydrogel monoliths formed by functionalized peptide Fmoc-RGD (Fmoc: fluorenylmethoxycarbonyl) containing the RGD cell adhesion tripeptide motif. The monolith is stable in water for nearly 40 days. The gel monoliths present a rigid porous structure consisting of a network of peptide fibers. The RGD-decorated peptide fibers have a β-sheet secondary structure. We prov...

UNLABELLED Radiolabeled cyclic peptides containing the amino acid sequence arginine-glycine-aspartate (RGD peptides) have successfully been used to image the expression of the alpha(v)beta(3) integrin in malignant tumors. However, the alpha(v)beta(3) integrin also plays an important role in angiogenesis induced by chronic inflammatory processes. Therefore, the aim of this study was to evaluate ...

BACKGROUND Nanotechnology-based near-infrared quantum dots (NIR QDs) have many excellent optical properties, such as high fluorescence intensity, good fluorescence stability, and strong tissue-penetrating ability. Integrin αvβ3 is highly and specifically expressed in tumor angiogenic vessel endothelial cells of almost all carcinomas. Recent studies have shown that NIR QDs linked to peptides con...

Abstract Hydroxamamide (Ham) is a thiol-free chelating agent that forms technetium-99m ( 99m Tc)-complexes with metal-to-ligand ratio of 1:2 under moderate reaction conditions. Therefore, Ham-based agents will produce Tc-labeled compounds bivalent targeting scaffold. For their universal usage, we developed novel bifunctional agent, “Ham-Mal”, maleimide group can easily conjugate thiol group, fo...

The quartz crystal microbalance technique with dissipation monitoring and the complementary optical microscopy technique were used for monitoring cell adhesion on an RGD-functionalized supported lipid bilayer. A critical interligand RGD spacing of nearly 80 nm was estimated for cell adhesion when an RGD spacing of 10 nm was necessary to observe flattened cells on a fluid surface.

UNLABELLED (18)F-galacto-RGD ((18)F-RGD) is a PET tracer binding to α(v)β(3) integrin receptors that are upregulated after myocardial infarction (MI) as part of the healing process. We studied whether myocardial (18)F-RGD uptake early after MI is associated with long-term left-ventricle (LV) remodeling in a rat model. METHODS Wistar rats underwent sham operation (n = 9) or permanent coronary ...

Based on the previous demonstration of a renoprotective effect of arginine-glycine-aspartic acid (RGD) peptides in acute renal failure, experiments were designed to test the distribution and renal accumulation of the peptide. To accomplish this goal, in this study, RGD peptide was radiolabeled and its biodistribution and renal accumulation was determined in rats with ischemic acute renal failur...

The interaction of cells with extracellular matrix components such as fibronectin, vitronectin, and type I collagen has been shown to be mediated through a family of cell-surface receptors that specifically recognize an arginine-glycine-aspartic acid (RGD) amino acid sequence within each protein. Synthetic peptides containing the RGD sequence can inhibit these receptor-ligand interactions. Here...