Intracellular uptake of magnetite nanoparticles conjugated with RGDS-peptide

Abstract

Peptides containing the Arg-Gly-Asp (RGD) motif inhibit cell adhesion and exhibit a range of other biological effects including anticoagulant and antimetastatic activities. This study examined the anchorage independent effects of an RGD-containing peptide, Arg-Gly-Asp-Ser (RGDS), on NIH 3T3 fibroblasts. Magnetite nanoparticles were prepared by the coprecipitation of ferrous iron (Fe 2+ ) and ferric iron (Fe 3+ ) with NH 4 OH and dextran (DNPs). The aminosilane agent of 3-aminopropyltriethoxysilane (A) is considered to be a candidate for modification of the surface of magnetite nanoparticles (ADNPs). The amino-functionalized magnetite nanoparticles were activated using the glutaraldehyde (G) method (GADNPs). Subsequently, RGD or RGDS peptides were immobilized on the glutaraldehyde-modified magnetite nanoparticles (RGADNPs or RSGADNPs). The RSGADNPs were evaluated using Fourier-transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), and dynamic light scattering (DLS). The biological responses of the RSGADNPs were evaluated using NIH 3T3 fibroblast cells. Inductively coupled plasma mass spectrophotometry (ICP-MS) and Prussian blue staining showed that the RSGADNPs were internalized into the NIH 3T3 cells compared to the RGADNPs. These results suggest that RSGADNP may find ever-growing applications in biological labels and detection or contrast agents in life science and medical diagnostics.

Targeted images of KB cells using folate-conjugated gold nanoparticles

“…This suggests that the GM carrying folic acid provide specific recognition signals for the nanoparticles to facilitate internalization into the target cells (KB cells). Interaction of the folic acid-conjugated GM with the folate receptors expressed on the membrane surface of the KB cells might have contributed to the improved internalization of GF into the cells, through receptor-mediated endocytosis [ 27 ]. Gan et al .…”

Internalization: acute apoptosis of breast cancer cells using herceptin-immobilized gold nanoparticles

“…GNPs showed an absorption onset at 386 nm and after herceptin immobilization, they exhibited a red shift to 389 nm. 26 This red shift was produced by strong quantum confinement due to the increase in particle size after metal-to-ligand charge transfer. 27 , 28 The surface modification of GNP with herceptin was also confirmed by FT-IR, as displayed in Figure 3 .…”

Targeted images of KB cells using folate-conjugated gold nanoparticles

“…This suggests that the GM carrying folic acid provide specific recognition signals for the nanoparticles to facilitate internalization into the target cells (KB cells). Interaction of the folic acid-conjugated GM with the folate receptors expressed on the membrane surface of the KB cells might have contributed to the improved internalization of GF into the cells, through receptor-mediated endocytosis [27]. Gan et al reported similar results [28].…”