Cellular uptake of gold nanoparticles and their behavior as labels for localization microscopy

• Verfasst von: Moser, Felipe [VerfasserIn]
• Verfasst von: Hildenbrand, Georg Lars [VerfasserIn]
• Verfasst von: Müller, Patrick [VerfasserIn]
• Verfasst von: Saroori, Alexander al [VerfasserIn]
• Verfasst von: Biswas, Abin [VerfasserIn]
• Verfasst von: Bach, Margund [VerfasserIn]
• Verfasst von: Wenz, Frederik [VerfasserIn]
• Verfasst von: Cremer, Christoph [VerfasserIn]
• Verfasst von: Burger, Nina [VerfasserIn]
• Verfasst von: Veldwijk, Marlon Romano [VerfasserIn]
• Verfasst von: Hausmann, Michael [VerfasserIn]
• Titel: Cellular uptake of gold nanoparticles and their behavior as labels for localization microscopy
• Verf.angabe: Felipe Moser, Georg Hildenbrand, Patrick Müller, Alexander Al Saroori, Abin Biswas, Margund Bach, Frederik Wenz, Christoph Cremer, Nina Burger, Marlon R. Veldwijk, Michael Hausmann
• E-Jahr: 2016
• Jahr: 23 February 2016
• Umfang: 7 S.
• Fussnoten: Gesehen am 05.12.2017
• Titel Quelle: Enthalten in: Biophysical journal
• Ort Quelle: Cambridge, Mass. : Cell Press, 1960
• Jahr Quelle: 2016
• Band/Heft Quelle: 110(2016), 4, Seite 947-953
• ISSN Quelle: 1542-0086
• DOI: doi:10.1016/j.bpj.2016.01.004
• Datenträger: Online-Ressource
• Sprache: eng
• Bibliogr. Hinweis: Forschungsdaten: Hildenbrand, Georg Lars, 1972 - : Dose enhancement effects of gold nanoparticles specifically targeting RNA in breast cancer cells [dataset]
• K10plus-PPN: 1566042372

Abstract

Gold nanoparticles (GNPs) enhance the damaging absorbance effects of high-energy photons in radiation therapy by increasing the emission of Auger-photoelectrons in the nm-μm range. It has been shown that the incorporation of GNPs has a significant effect on radiosensitivity of cells and their dose-dependent clonogenic survival. One major characteristic of GNPs is also their diameter-dependent cellular uptake and retention. In this article, we show by means of an established embodiment of localization microscopy, spectral position determination microscopy (SPDM), that imaging with nanometer resolution and systematic counting of GNPs becomes feasible, because optical absorption and plasmon resonance effects result in optical blinking of GNPs at a size-dependent wavelength. To quantify cellular uptake and retention or release, SPDM with GNPs that have diameters of 10 and 25 nm was performed after 2 h and after 18 h. The uptake of the GNPs in HeLa cells was either achieved via incubation or transfection via DNA labeling. On average, the uptake by incubation after 2 h was approximately double for 10 nm GNPs as compared to 25 nm GNPs. In contrast, the uptake of 25 nm GNPs by transfection was approximately four times higher after 2 h. The spectral characteristics of the fluorescence of the GNPs seem to be environment-dependent. In contrast to fluorescent dyes that show blinking characteristics due to reversible photobleaching, the blinking of GNPs seems to be stable for long periods of time, and this facilitates their use as an appropriate dye analog for SPDM imaging.