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Published on: February 4, 2014
A class of benzenoid chemicals suppresses apoptosis in C. elegans
1Department of MCD Biology, University of Colorado, Boulder, CO 80309, USA.
Abstract:
Benzene is a human carcinogen that might act through both genotoxic and nongenotoxic mechanisms to promote tumorigenesis. The genotoxic effects of benzene are well established, however, its potential nongenotoxic roles in carcinogenesis are poorly understood. We find that benzene suppresses somatic apoptosis in C. elegans; this suggests a potential nongenotoxic mechanism by which this chemical might promote tumorigenesis. We find that two other benzenoid chemicals, biphenyl and toluene, also inhibit apoptosis in C. elegans. Notably, these chemicals are suspected carcinogens in mammals; this suggests that a subclass of benzenoid chemicals might promote tumorigenesis by suppressing apoptosis. A benzene metabolite, 1,4-benzoquinone, can directly inhibit the activity of caspase-3; this suggests a general molecular mechanism by which benzenoid chemicals might suppress apoptosis. These findings suggest that C. elegans is an excellent alternative animal model for studying the antiapoptotic activity of tumor-promoting chemicals and for identifying in vivo targets of these chemicals.
Insights
Benzene and similar chemicals suppress apoptosis, a key cell death process, suggesting a new mechanism for how they may cause cancer. This study highlights the utility of C. elegans in cancer research.
Area of Science:
- Toxicology
- Molecular Biology
- Genetics
Background:
- Benzene is a known human carcinogen with both genotoxic and nongenotoxic mechanisms implicated in tumorigenesis.
- The nongenotoxic roles of benzene in cancer promotion are not well understood.
- Apoptosis, or programmed cell death, is a critical process in preventing uncontrolled cell proliferation.
Purpose of the Study:
- To investigate the potential nongenotoxic mechanisms of benzene-induced carcinogenesis.
- To explore the role of apoptosis suppression in benzene's tumor-promoting activity.
- To evaluate Caenorhabditis elegans (C. elegans) as a model for studying anti-apoptotic chemicals.
Main Methods:
- Utilized the nematode C. elegans as a model organism to study somatic apoptosis.
- Administered benzene, biphenyl, toluene, and 1,4-benzoquinone to C. elegans.
- Assessed the impact of these chemicals on apoptosis.
- Investigated the direct effect of 1,4-benzoquinone on caspase-3 activity.
Main Results:
- Benzene was found to suppress somatic apoptosis in C. elegans, suggesting a nongenotoxic role in tumorigenesis.
- Biphenyl and toluene also inhibited apoptosis in C. elegans, indicating a potential class effect among benzenoid chemicals.
- A benzene metabolite, 1,4-benzoquinone, directly inhibited caspase-3 activity, proposing a molecular mechanism for apoptosis suppression.
- C. elegans demonstrated efficacy in studying the anti-apoptotic effects of tumor-promoting agents.
Conclusions:
- Suppression of apoptosis by benzene and related benzenoid compounds represents a potential nongenotoxic mechanism for cancer promotion.
- C. elegans serves as a valuable model for studying chemical-induced apoptosis inhibition and identifying therapeutic targets.
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