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Dequalinium induces a selective depletion of mitochondrial DNA from HeLa human cervical carcinoma cells
K R Schneider Berlin1, C V Ammini, T C Rowe
1Department of Pharmacology and Therapeutics, University of Florida College of Medicine, Gainesville, Florida, 32610-0267, USA.
Abstract:
Treatment of cultured human cervical carcinoma cells with the anticancer drug dequalinium (DEQ) was found to cause a delayed inhibition of cell growth. This inhibition was preceded by a loss of mitochondrial DNA (mtDNA), a decrease in cytochrome c oxidase activity, and an increase in the level of lactate, indicating that growth inhibition was due to the loss of mtDNA-encoded functions. There was a progressive two-fold loss of mtDNA following each cell division in the presence of DEQ, suggesting that this drug was acting by inhibiting some aspect of mtDNA synthesis. Furthermore, cells became resistant to the growth inhibitory and cytotoxic affects of DEQ when they were grown under conditions that bypassed the need for mtDNA-encoded functions. Resistance was not associated with significant changes in drug accumulation. These results suggest that the DEQ-induced depletion of mtDNA plays an important role in drug cytotoxicity.
Insights
The anticancer drug dequalinium (DEQ) inhibits cervical cancer cell growth by depleting mitochondrial DNA (mtDNA). This loss disrupts essential mitochondrial functions, leading to cell death and demonstrating DEQ
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Dequalinium (DEQ) is an anticancer drug with a known impact on cell growth.
- Mitochondrial DNA (mtDNA) encodes essential proteins for cellular respiration.
Purpose of the Study:
- To investigate the mechanism by which dequalinium (DEQ) inhibits human cervical carcinoma cell growth.
- To determine the role of mitochondrial DNA (mtDNA) in DEQ-induced cytotoxicity.
Main Methods:
- Treatment of cultured human cervical carcinoma cells with DEQ.
- Measurement of cell growth, mitochondrial DNA (mtDNA) levels, cytochrome c oxidase activity, and lactate production.
- Assessment of cellular resistance to DEQ under conditions bypassing mtDNA-encoded functions.
Main Results:
- DEQ treatment caused delayed cell growth inhibition.
- Inhibition correlated with loss of mitochondrial DNA (mtDNA), decreased cytochrome c oxidase activity, and increased lactate.
- Cells bypassed DEQ effects when mtDNA-independent functions were utilized, independent of drug accumulation.
Conclusions:
- DEQ-induced depletion of mitochondrial DNA (mtDNA) is a key mechanism underlying its cytotoxic effects.
- The drug likely inhibits mtDNA synthesis, leading to loss of essential mitochondrial functions and cell death.
- Targeting mtDNA may be a viable strategy for developing new anticancer therapies.