Cellular uptake induced biotoxicity of surface-modified CdSe quantum dots
Source abstract
Abstract
Cellular uptake of quantum dots (QDs) by cells is of utmost importance for establishing QDs as biostable fluorescent markers that facilitate early diagnosis and detection of cancer. The surface states of QDs are critical to enhance the cellular uptake. Biocompatible CDSe QDs were synthesized using mercaptopropionic acid, amino-ethanethiol HCl, cyltrimethylammonium bromide, dodecyltrimethylammonium bromide, tetrabutylammonium iodide (TBAI), and sodium dodecyl sulfate were functionalized using ligand-exchange method. Cytocompatibility and cellular uptake of QDs were evaluated in human embryonic kidney cells (HEK-29), and breast cancer cells (MCF-7) as reduced cytotoxicity is desirable for biological applications. Approximately, 60 % cytotoxicity was observed in all surface-coated QDs and QD100 in 72 h in both the cell lines, except TBAI that indicated 30 % cytotoxicity in 72 h, and only 10 % in 24 h. Glutathione, the detoxifying molecule, is detrimental for understanding the oxidative stress of the cell. The QDs showed enhanced Glutathione-S-transferase (GST) activity in the MCF-7 cell line. In HEK, CdSe per se was also able to induce a high level of GST. QDs toxicity may either be related to the induction of reactive oxygen species or the direct release of metal ions. Optimization of QDs in terms of quantification and DNA damage is imperative for realistic biological applications.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Quantum Dots Synthesis And Properties · Advanced biosensing and bioanalysis techniques · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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