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We introduce a method to monitor the integrity of micellar nanocarriers using a novel fluorescent dye, IR-780-PDMS and Förster resonance energy transfer (FRET) as a readout. In addition, these dye-loaded nanocarriers can be used as a phototoxic agent in vitro. Mainly, a nanocarrier was designed, based on a previously described amphiphilic ABA-copolymer (Pip-PMOXA-PDMS-PMOXA-Pip) scaffold that incorporates the fluorescent FRET dye partners IR-780-PDMS (donor) and IR-780 (acceptor). The confirmation of FRET (that only occurs when donor and acceptor are in the required close proximity of less than ~10 nm) in the nanocarriers is used to prove that the acceptor dye (IR-780) is still contained in its hydrophobic core. We measured such FRET signals of the nanocarriers also upon cellular uptake into HeLa cells using fluorescence-lifetime imaging microscopy (FLIM). Confocal laser scanning microscopy after incubation with nanocarriers demonstrated the intracellular uptake of the particles and their localization in an intracellular granular patterns. To demonstrate the intactness of the nanocarriers by detection of FRET we measured the fluorescence lifetime (FLIM) of the donor dye. FLIM showed that both types of lifetimes, that of the quenched donor, and that of the unquenched donor were present, in a granular pattern and homogenously in cytosol, respectively, indicating the presence of intracellular intact and disintegrated micellar nanocarriers. These data show that the herewith-described FRET method allows monitoring the intactness of nanocarriers while en route to the target, and also that the cargo is delivered and released within a potential target cell. In addition, near infrared (NIR) irradiation of IR-780-loaded micellar nanocarriers leads to photocytotoxicity, which we demonstrated in in vitro experiments. Our findings open potential avenues in photodynamic therapy (PDT) of cancer.
This article was published in the following journal.
Extensive studies on nanomedicines have been conducted for drug delivery and disease diagnosis (especially for cancer therapy). However, the intracellular and in vivo biofate of nanomedicines, which i...
FÖrster resonance energy transfer (FRET)-based biosensors have achieved great success for biological applications. However, what is not extensively appreciated is the growing role as versatile FRET b...
The applications of Förster resonance energy transfer (FRET) grow with each year. However, different FRET techniques are not applied consistently, nor are results uniformly presented, which makes imp...
Three-dimensional porous material holds enormous potential in the field of life science and environmental protection. In this work, we proposed a facile route for large-scale synthesis of porous PDMS ...
Polydimethylsiloxane (PDMS)-based elastomers have become the de facto platform for various biomedical applications. But the stable attachment of biomolecules to PDMS for more robust and long-term perf...
The objective of this work is to evaluate, from volunteers viewpoint, the usability, comfort, appearance, weight, superficial temperature, and other characteristics of a polymeric plate de...
RATIONALE: Drugs used in chemotherapy, such as paclitaxel-loaded polymeric micelle and carboplatin, work in different ways to stop the growth of tumor cells, either by killing the cells or...
a) Compare between Nonabsorbable Polymeric Clips and Endoloop ligatures regarding: 1. technical difficulties. 2. operation time. 3. cost effectiveness. 4. postopera...
The purpose of this study is to evaluate the response rate in patients with taxane-pretreated recurrent breast cancer receiving paclitaxel loaded polymeric micelle (Genexol-PM).
The current study will enroll patients who are going to require enteral nutrition support for at least 4 weeks and randomize them to standard polymeric formulas or blenderized tube feeding...
A 15 kD "joining" peptide that forms one of the linkages between monomers of IMMUNOGLOBULIN A or IMMUNOGLOBULIN M in the formation of polymeric immunoglobulins. There is one J chain per one IgA dimer or one IgM pentamer. It is also involved in binding the polymeric immunoglobulins to POLYMERIC IMMUNOGLOBULIN RECEPTOR which is necessary for their transcytosis to the lumen. It is distinguished from the IMMUNOGLOBULIN JOINING REGION which is part of the IMMUNOGLOBULIN VARIABLE REGION of the immunoglobulin light and heavy chains.
Specialized Fc receptors (RECEPTORS, FC) for polymeric immunoglobulins, which mediate transcytosis of polymeric IMMUNOGLOBULIN A and IMMUNOGLOBULIN M into external secretions. They are found on the surfaces of epithelial cells and hepatocytes. After binding to IMMUNOGLOBULIN A, the receptor-ligand complex undergoes endocytosis, transport by vesicle, and secretion into the lumen by exocytosis. Before release, the part of the receptor (SECRETORY COMPONENT) that is bound to IMMUNOGLOBULIN A is proteolytically cleaved from its transmembrane tail. (From Rosen et al., The Dictionary of Immunology, 1989)
Polymeric materials (usually organic) of large molecular weight which can be shaped by flow. Plastic usually refers to the final product with fillers, plasticizers, pigments, and stabilizers included (versus the resin, the homogeneous polymeric starting material). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Polymeric derivatives of GALLIC ACID that are esters of a sugar.
A polymeric amine that binds phosphate and is used to treat HYPERPHOSPHATEMIA in patients with kidney disease.
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