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Water-insoluble camptothecin analogues as potential antiviral drugs
P Pantazis1, Z Han, D Chatterjee
1Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, R.I., USA. pantazis@brown.edu
Abstract:
In addition to being causative agents of infectious diseases in animals and humans, DNA viruses have served as models for the study of eukaryotic molecular mechanisms including replication and transcription. Studies of DNA virus functions utilizing cell-free systems and virus-infected cells in culture, in the presence of the anticancer drug camptothecin (CPT), have demonstrated that CPT is a potent inhibitor of replication, transcription and packaging of double-stranded DNA-containing adenoviruses, papovaviruses and herpesviruses, and the single- stranded DNA-containing autonomous parvoviruses. CPT inhibits viral functions by inhibiting topoisomer- ase I, a host cell enzyme required for initiation and completion of the viral functions. These findings indicate that CPT analogues could be developed for use as potent drugs against DNA viruses.
Insights
The anticancer drug camptothecin (CPT) effectively inhibits DNA virus replication and transcription by targeting a host cell enzyme. This suggests CPT analogues could be developed into potent antiviral drugs against DNA viruses.
Area of Science:
- Virology
- Molecular Biology
- Antiviral Drug Development
Background:
- DNA viruses cause infections in humans and animals.
- DNA viruses are crucial models for studying eukaryotic molecular mechanisms like replication and transcription.
- Anticancer drug camptothecin (CPT) has shown inhibitory effects on various cellular processes.
Purpose of the Study:
- To investigate the effect of camptothecin (CPT) on DNA virus replication, transcription, and packaging.
- To determine the mechanism by which CPT inhibits viral functions.
- To explore the potential of CPT analogues as antiviral agents against DNA viruses.
Main Methods:
- Utilizing cell-free systems and virus-infected cell cultures.
- Treating systems with the anticancer drug camptothecin (CPT).
- Analyzing the impact of CPT on viral replication, transcription, and packaging.
Main Results:
- CPT potently inhibited replication, transcription, and packaging of double-stranded DNA viruses (adenoviruses, papovaviruses, herpesviruses) and single-stranded DNA viruses (parvoviruses).
- CPT functions by inhibiting topoisomerase I, a host cell enzyme essential for viral DNA replication and transcription.
- The study identified topoisomerase I as the target of CPT's antiviral activity.
Conclusions:
- Camptothecin (CPT) is a potent inhibitor of DNA virus replication and transcription.
- CPT's mechanism involves the inhibition of host cell topoisomerase I.
- CPT analogues hold promise as novel therapeutic agents for treating DNA virus infections.