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Updated: Nov 28, 2025
An Automated Differential Nuclear Staining Assay for Accurate Determination of Mitocan Cytotoxicity
Published on: May 12, 2020
Cyanine mitochondrial dye with slightly selective cytotoxicity against A549 cancerous cells
Dmitry A Skvortsov1,2, Sophia K Emashova1, Marina A Kalinina3
1Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia.
Abstract:
Delocalized lipophilic cations (DLCs) are known as mitochondria-addressed molecules. Mitochondria targeting may provide opportunities for tumor detection. DLCs may have antioxidant or anticancer properties. In this study, we focused on the toxicity and localization of 2-[(E)-2-(5-fluoro-2-methyl-1H-indol-3-yl)ethenyl]-1,6-dimethylpyridin-1-ium iodide (62E2), which has recently been found as a novel cytotoxic fluorescent compound. The excitation maximum of 62E2 is 452 ± 10 nm and its emission maximum is 579 ± 10 nm. It is accumulated in the cells and stains mitochondria in nanomolar concentrations. 62E2 is cytotoxic and mitotoxic in low micromolar concentrations, and it demonstrates some selectivity of cytotoxicity against A549 cancer cells. The closest analog of 62E2 is F16, which is the fluorescent mitotoxic agent that has been described earlier as a potential anticancer agent. We hope that 62E2 described here is useful in expanding the diversity of cyanine fluorescent mitochondrial dyes and the analysis of their structure-activity relationships.
Insights
Delocalized lipophilic cations (DLCs) are mitochondria-targeting molecules. This study shows 62E2 is a novel fluorescent compound that is cytotoxic to cancer cells and stains mitochondria.
Area of Science:
- Mitochondrial research
- Fluorescent probes
- Cancer therapeutics
Background:
- Delocalized lipophilic cations (DLCs) target mitochondria.
- Mitochondria-targeting molecules offer potential for tumor detection and treatment.
- Novel cytotoxic fluorescent compounds are valuable research tools.
Purpose of the Study:
- To investigate the toxicity and cellular localization of the novel fluorescent compound 62E2.
- To evaluate 62E2's potential as a mitochondria-targeting agent for cancer research.
- To explore structure-activity relationships of cyanine fluorescent mitochondrial dyes.
Main Methods:
- Characterization of 62E2's spectral properties (excitation/emission maxima).
- Cellular accumulation and mitochondria staining assays at nanomolar concentrations.
- Cytotoxicity and mitotoxicity assessments in low micromolar concentrations.
- Selective cytotoxicity evaluation against A549 cancer cells.
Main Results:
- 62E2 exhibits excitation/emission maxima at 452 ± 10 nm and 579 ± 10 nm.
- 62E2 efficiently accumulates in cells and stains mitochondria at nanomolar concentrations.
- 62E2 demonstrates cytotoxicity and mitotoxicity at low micromolar concentrations.
- 62E2 shows selective cytotoxicity against A549 cancer cells.
Conclusions:
- 62E2 is a novel, cytotoxic, fluorescent compound that effectively targets mitochondria.
- The compound exhibits selective cytotoxicity against A549 cancer cells.
- 62E2 expands the diversity of cyanine fluorescent mitochondrial dyes and aids structure-activity relationship studies.
