Raman spectroscopy and silver nanoparticles for efficient detection of membrane proteins in living cells
| Autor: | Aracely Angulo-Molina, Seidy Pedroso-Santana, Noralvis Fleitas-Salazar, Jorge R. Toledo, Martín Pedroza-Montero, Raúl Riera, Erika Silva-Campa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Erythrocytes Silver Materials science Metal Nanoparticles Bioengineering macromolecular substances Spectrum Analysis Raman Silver nanoparticle Cell membrane Hemoglobins symbols.namesake medicine Humans Molecule General Materials Science Particle Size Electrical and Electronic Engineering Mechanical Engineering Cell Membrane technology industry and agriculture General Chemistry medicine.anatomical_structure Membrane Membrane protein Mechanics of Materials symbols Biophysics Hemoglobin Raman spectroscopy Raman scattering |
| Zdroj: | Nanotechnology. 32:495101 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/1361-6528/ac21ee |
| Popis: | Molecular fingerprints revealed by Raman techniques show great potential for biomedical applications, like disease diagnostic through Raman detection of tumor markers and other molecules in the cell membrane. However, SERS substrates used in membrane molecule studies produce enhanced Raman spectra of high variability and challenging band assignments that limit their application. In this work, these drawbacks are addressed to detect membrane-associated hemoglobin (Hbm) in human erythrocytes through Raman spectroscopy. These cells are incubated with silver nanoparticles (AgNPs) in PBS before Raman measurements. Our results showed that AgNPs form large aggregates in PBS that adhered to the erythrocyte membrane, which enhances Raman scattering by molecules around the membrane, like Hbm. Also, deoxyHb markers may allow Hbm detection in Raman spectra of oxygenated erythrocytes (oxyRBCs). Raman spectra of oxyRBCs incubated with AgNPs showed enhanced deoxyHb signals with good spectral reproducibility, supporting the Hbm detection through deoxyHb markers. Instead, Raman spectra of oxyRBCs showed oxyHb bands associated with free cytoplasmic hemoglobin. Other factors influencing Raman detection of membrane proteins are discussed, like both z-position and dimension of the sample volume. The results encourage membrane protein studies in living cells using Raman spectroscopy, leading to the characterization and diagnostic of different pathologies through a non-invasive technique. |
| Databáze: | OpenAIRE |
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