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QD:Puf Nanohybrids Are Compatible with Studies in Cells
Karolina Wójtowicz1, Magda A Antoniak2, Martyna Trojnar3
1Department of Biotransformation, Faculty of Biotechnology, University of Wrocław, ul. F. Joliot-Curie 14a, 50-383 Wrocław, Poland.
Nanomaterials (Basel, Switzerland)
|September 23, 2022
Summary
Purpose-designed semiconductor quantum dots (QDs) coated with Puf protein are taken up by HeLa cells, localizing in internal membranes. QD accumulation decreases cell viability by disrupting endoplasmic reticulum function.
Area of Science:
- Cell Biology
- Nanotechnology
- Biochemistry
Background:
- Semiconductor quantum dots (QDs) are valuable fluorescent labels and active components in cellular assays.
- Biocompatibility of QDs is a challenge, often due to instability and hydrophilicity issues with their outer coatings.
- Understanding QD-cell interactions is crucial for their application in biological studies.
Purpose of the Study:
- To investigate the cellular uptake and intracellular localization of purpose-designed cadmium selenide (CdSe) QDs coated with Puf protein.
- To assess the impact of QD accumulation on HeLa cell viability and function.
- To evaluate the stability of QD fluorescence properties within the cellular microenvironment.
Main Methods:
- HeLa cells were incubated with purpose-designed CdSe QDs coated with Puf protein.
- Cellular uptake and intracellular localization were analyzed using fluorescence microscopy.
- Changes in cell viability were assessed.
- Fluorescence properties (emission wavelength, lifetime) of QDs were measured post-incubation.
Main Results:
- Efficient accumulation of Puf protein-coated CdSe QDs by HeLa cells was observed within hours.
- Fluorescence was primarily localized within the cell's internal membrane system, including the endoplasmic reticulum and Golgi apparatus.
- QD fluorescence properties were largely preserved, with slight shifts in emission wavelength and shortened fluorescence lifetime.
- QD accumulation led to a reduction in cell viability, linked to endoplasmic reticulum dysfunction.
Conclusions:
- Puf protein-coated CdSe QDs demonstrate efficient cellular uptake and specific intracellular localization in HeLa cells.
- These QDs can serve as fluorescent probes for studying intracellular membrane systems.
- The observed decrease in cell viability highlights the potential cytotoxicity of QDs and the need for careful design and application in biological systems.
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