Related Experiment Video
Updated: Apr 18, 2026
Quantifying Antibody-Dependent Cellular Cytotoxicity in a Tumor Spheroid Model: Application for Drug Discovery
Published on: April 26, 2024
Cytotoxicity of anticancer aziridinyl-substituted benzoquinones in primary mice splenocytes
Valė Miliukienė1, Henrikas Nivinskas1, Narimantas Čėnas1
1Institute of Biochemistry of Vilnius University, Vilnius, Lithuania.
Abstract:
The anticancer activity of aziridinyl-quinones is mainly attributed to their
Nad(P)H:
quinone oxidoreductase 1 (NQO1)-catalyzed two-electron reduction into DNA-alkylating products. However, little is known about their cytotoxicity in primary cells, which may be important in understanding their side effects. We found that the cytotoxicity of aziridinyl-unsubstituted quinones (n = 12) in mice splenocytes with a low amount of NQO1, 4 nmol × mg(-1) × min(-1), was caused mainly by the oxidative stress. Aziridinyl-benzoquinones (n = 6) including a novel anticancer agent RH1 were more cytotoxic than aziridinyl-unsubstituted ones with the similar redox properties, and their cytotoxicity was not decreased by an inhibitor of NQO1, dicumarol. The possible reasons for their enhanced cytotoxicity are discussed.
Insights
Aziridinyl-quinones exhibit anticancer activity through oxidative stress and DNA alkylation. Novel aziridinyl-benzoquinones show enhanced cytotoxicity independent of NQO1, suggesting potential for reduced side effects.
Area of Science:
- Biochemistry
- Pharmacology
- Toxicology
Background:
- Aziridinyl-quinones are known anticancer agents, primarily acting via NQO1-mediated DNA alkylation.
- Their cytotoxicity in primary cells and potential side effects remain under-investigated.
- Understanding mechanisms beyond NQO1 is crucial for developing safer anticancer drugs.
Purpose of the Study:
- To investigate the cytotoxicity of aziridinyl-quinones in primary cells.
- To differentiate the mechanisms of cytotoxicity between aziridinyl-unsubstituted and aziridinyl-benzoquinones.
- To evaluate the role of NQO1 in the observed cytotoxic effects.
Main Methods:
- Cytotoxicity assays were performed on mice splenocytes.
- Quinone oxidoreductase 1 (NQO1) activity was measured.
- The effect of NQO1 inhibition (dicumarol) on cytotoxicity was assessed.
- Redox properties of the quinones were considered.
Main Results:
- Aziridinyl-unsubstituted quinones showed cytotoxicity primarily driven by oxidative stress in low NQO1-expressing cells.
- Aziridinyl-benzoquinones, including RH1, were more cytotoxic than unsubstituted analogs.
- The enhanced cytotoxicity of aziridinyl-benzoquinones was not diminished by NQO1 inhibition.
Conclusions:
- Cytotoxicity of aziridinyl-quinones involves both NQO1-dependent and independent pathways.
- Aziridinyl-benzoquinones possess potent cytotoxic activity potentially mediated by mechanisms other than NQO1.
- These findings highlight the importance of considering cellular context and alternative mechanisms for anticancer drug development.
More Related Videos
10:13Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
Published on: May 6, 2019
15:04Potentiation of Anticancer Antibody Efficacy by Antineoplastic Drugs: Detection of Antibody-drug Synergism Using the Combination Index Equation
Published on: January 19, 2019