Cadmium-Free Quantum Dots as Fluorescent Labels for Exosomes
| Autor: | Deanna Ayupova, Renee V. Goreham, Thomas Nann, Geoffry Laufersky, Zeineb Ayed, Garima Dobhal |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Phosphines 02 engineering and technology Sulfides lcsh:Chemical technology Exosomes Biochemistry Indium Article Analytical Chemistry Cell Line 03 medical and health sciences Dynamic light scattering Quantum Dots Fluorescence microscope antibodies Humans lcsh:TP1-1185 Electrical and Electronic Engineering Surface plasmon resonance bioimaging Instrumentation Fluorescent Dyes chemistry.chemical_classification quantum yields Chemistry Tetraspanin 30 Biomolecule 021001 nanoscience & nanotechnology Fluorescence Atomic and Molecular Physics and Optics Microvesicles Carbodiimides 030104 developmental biology Quantum dot Zinc Compounds Biophysics 0210 nano-technology extracellular vesicles Conjugate Cadmium |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 18, Iss 10, p 3308 (2018) Sensors Volume 18 Issue 10 |
| ISSN: | 1424-8220 |
| Popis: | Quantum dots are attractive alternatives to organic fluorophores for the purposes of fluorescent labeling and the detection of biomarkers. They can also be made to specifically target a protein of interest by conjugating biomolecules, such as antibodies. However, the majority of the fluorescent labeling using quantum dots is done using toxic materials such as cadmium or lead due to the well-established synthetic processes for these quantum dots. Here, we demonstrate the use of indium phosphide quantum dots with a zinc sulfide shell for the purposes of labeling and the detection of exosomes derived from the THP-1 cell line (monocyte cell line). Exosomes are nano-sized vesicles that have the potential to be used as biomarkers due to their involvement in complex cell processes. However, the lack of standardized methodology around the detection and analysis of exosomes has made it difficult to detect these membrane-containing vesicles. We targeted a protein that is known to exist on the surface of the exosomes (CD63) using a CD63 antibody. The antibody was conjugated to the quantum dots that were first made water-soluble using a ligand-exchange method. The conjugation was done using carbodiimide coupling, and was confirmed using a range of different methods such as dynamic light scattering, surface plasmon resonance, fluorescent microscopy, and Fourier transform infrared spectroscopy. The conjugation of the quantum dot antibody to the exosomes was further confirmed using similar methods. This demonstrates the potential for the use of a non-toxic conjugate to target nano-sized biomarkers that could be further used for the detection of different diseases. |
| Databáze: | OpenAIRE |
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