BACKGROUND Biotin is an essential micronutrient and its levels are high in rapidly proliferating cells such as cancer cells. We hypothesized that the synthesis of poly (amido)amine (PAMAM) dendrimers with biotin molecules might contribute to enhanced cancer cell-specific uptake. MATERIALS AND METHODS PAMAM dendrimers were biotinylated using sulfo-NHS-LC-biotin and structural characterization ...

Engineered nanomaterials are increasingly being developed for paints, sunscreens, cosmetics, industrial lubricants, tyres, semiconductor devices, and also for biomedical applications such as in diagnostics, therapeutics, and contrast agents. As a result, nanomaterials are being manufactured, transported, and used in larger and larger quantities, and potential impacts on environmental and human ...

The interaction between PAMAM (polyamidoamine) dendrimer generation 4 (G4) and 3,5 (G3,5) with model lipid membranes composed of dipalmytoylphosphatidylcholine (DPPC) has been investigated. Differential scanning calorimetry (DSC) and Raman spectroscopy were applied to assess the thermodynamic changes caused by PAMAM G4 and G3,5 and to specify the exact location of these dendrimers into the DPPC...

Oral delivery remains a challenge for poorly permeable hydrophilic macromolecules. Poly(amido amine) (PAMAM) dendrimers have shown potential for their possible oral delivery. Transepithelial transport of carboxyl-terminated G3.5 and amine-terminated G4 PAMAM dendrimers was assessed using isolated rat jejunal mucosae mounted in Ussing chambers. The 1 mM FITC-labeled dendrimers were added to the ...

Poly(amidoamine) (PAMAM) dendrimers are hyper-branched polymers with uniform size, defined molecular weight, large internal cavities and a high number of surface groups that make them particularly suitable for a number of biomedical and technological applications [1]. It has been found that surface functionalization is the main factor modulating the toxicity of dendrimers to mammalian cells lin...

PAMAM dendrimers are used as a model system to investigate the effects of counterion condensation and the effective charge for spherical polyelectrolytes. Because of their amino groups, PAMAM dendrimers are weak polyelectrolytes. Lowering the pH results in an increasing protonation of the amino groups which is monitored via the proton chemical shifts of the adjacent CH2 groups. The effective ch...

Dendrimers are a relatively new class of polymer, with well-defined molecular structures. They are synthesized from a polyfunctional core by adding branched monomers that react with the functional groups of the core, in turn leaving end groups that can react again. This results in a large number of reactive terminal groups that increases after each cycle or " generation ". The structure of a gi...

Gene, short hairpin RNA (shRNA) and small interfering RNA (siRNA) delivery can be particularly used for the treatment of diseases by the entry of genetic materials mammalian cells either to express new proteins or to suppress the expression of proteins, respectively. Polyamidoamine (PAMAM) StarburstTM dendrimers are used as non-viral vectors (carriers) for gene, shRNA and siRNA delivery. Recent...

The development of methods for the facile conjugation and radiolabeling of poly(amido)amine (PAMAM) dendrimers would be of great benefit in evaluating biomedical applications of these intriguing molecularly defined polymers. Two anionic N-hydroxysuccinimide (NHS) esters (7 and 10) were developed and radiolabeled with fluorine-18 using Cu(I)-catalyzed click reactions. The radiolabeling of a prim...

objective: in recent decades, the anticancer effect of curcumin has been proven by several studies. curcumin affects multiple cell signaling pathways and prevents cell proliferation, invasion, metastasis and angiogenesis. however, the aqueous solubility of curcumin and its bioavailability are very low which restricts its anticancer properties. in this research, we have synthesized a monomethoxy...