A novel nanoscale molecular probe is formulated in order to reduce toxicity and side effects of antitumor drug doxorubicin (DOX) in normal tissues and to enhance the detection sensitivity during early imaging diagnosis. The mechanism involves a specific targeting of Arg-Gly-Asp peptide (RGD)-GX1 heterogeneous dimer peptide-conjugated dendrigraft poly-l-lysine (DGL)-magnetic nanoparticle (MNP) c...

BACKGROUND The purpose of this study was to demonstrate the effectiveness of an integrin peptide ligand-labeled liposomal delivery system loaded with vascular endothelial growth factor (VEGF)-siRNA in a model study of gene therapy for retinopathy using human retinal pigment epithelial cells. METHODS Arg(R)-Gly(G)-Asp(D) motif peptide conjugating polyethylene glycol modified (RGD-PEGylated) li...

Advances in tissue engineering require biofunctional scaffolds that can not only provide cells with structural support, but also interact with cells in a biological manner. To achieve this goal, a frequently used cell adhesion peptide Arg-Gly-Asp (RGD) was covalently incorporated into poly(ethylene glycol) diacrylate (PEODA) hydrogel and its dosage effect (0.025, 1.25 and 2.5 mm) on osteogenesi...

The treatment of a brain glioma remains one of the most difficult challenges in oncology. In the present study a delivery system was developed for targeted drug delivery across the blood-brain barrier (BBB) to the brain cancer cells. A cyclic arginine-glycine-aspartic acid (RGD) peptide and transferrin (TF) were utilized as targeting ligands. Cyclic RGD peptides are specific targeting ligands o...

Human embryonic stem cells (hESCs) have numerous potential biomedical applications owing to their unique abilities for self-renewal and pluripotency. Successful clinical application of hESCs and derivatives necessitates the culture of these cells in a fully defined environment. We have developed a novel peptide-based surface that uses a high-affinity cyclic RGD peptide for culture of hESCs unde...

The previous studies on the RGD motif (aa403-405) within SARS CoV-2 spike (S) protein receptor binding domain (RBD) suggest that integrin(s) may play an important role in infection of host cells. We also discussed possible two other integrin motifs are present S protein: LDI (aa585-587) and ECD (661-663), used by some viruses course infection. MultiFOLD models for structure analysis have shown ...

2) RGD-conjugated HFn-iron oxide nanoparticles Using the recombinant human heavy-chain ferritin protein cage, HFn was genetically engineered to display 24 copies of an RGD-4C peptide (CDCRGDCFC) on the exterior surface of the protein cage. Magnetite (Fe3O4) was encapsulated in interior cavities of RGD-conjugated HFn (RGD HFn) and non-targeted HFn (RGD HFn) at loading factors of 5000Fe per cage,...

Arginine-glycine-aspartic acid (RGD)– mimetic platelet inhibitors act by occupying the RGD recognition site of IIb/ 3 integrin (GPIIb/IIIa), thereby preventing the activated integrin from reacting with fibrinogen. Thrombocytopenia is a wellknown side effect of treatment with this class of drugs and is caused by Abs, often naturally occurring, that recognize IIb/ 3 in a complex with the drug bei...

Local drug delivery has become an important treatment modality for the prevention of thrombotic events following coronary angioplasty. In this study, we investigate the ability of liposomes bearing surface conjugated linear Arg-Gly-Asp (RGD) peptide (GSSSGRGDSPA) moieties to target and bind activated platelets, and the effect of such RGD-modified liposomes on platelet activation and aggregation...

Savignygrin, a platelet aggregation inhibitor that possesses the RGD integrin recognition motif, has been purified from the soft tick Ornithodoros savignyi. Two isoforms with similar biological activities differ because of R52G and N60G in their amino acid sequences, indicating a recent gene duplication event. Platelet aggregation induced by ADP (IC50, 130 nm), collagen, the thrombin receptor-a...