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Mechanisms of cytotoxicity caused by antitumour drugs
J A Hickman1, H M Beere, A C Wood
1Molecular Pharmacology and Toxicology Group, School of Biological Sciences, University of Manchester, UK.
Abstract:
Although the nature of the interaction between a drug or toxin and its target is of critical importance in determining the fate of a cell, we have argued here that the biological outcome of that interaction will also be determined by the nature of cellular events "downstream" of the initial interactions. We suggest that some type of coupling must take place between the formation of a drug-target interaction (the stimulus?) and the response of the cell. That response will depend upon the phenotypically determined repertoire of response open to the cell as well as upon the quantitative and qualitative measures of the events that the drug induces (DNA or protein damage, inhibition of growth etc.). For example we have described how the HL-60 cell appears to respond to low levels of toxins by engaging a programme of terminal differentiation whilst at greater concentrations apoptosis becomes engaged. Consideration of the cellular response to a toxic insult may provide valuable insights into the selective toxicity of agents as well as providing avenues for the discovery of toxins which might be useful in the treatment of cancer.
Insights
Cellular response to toxins depends on downstream events, not just initial drug-target interactions. Understanding these events can reveal selective toxicity and potential cancer treatments.
Area of Science:
- Toxicology
- Cell Biology
- Pharmacology
Background:
- Drug-target interactions are crucial for cellular fate.
- Cellular responses are influenced by events downstream of initial interactions.
- Coupling between drug-target interaction and cellular response is essential.
Purpose of the Study:
- To explore the role of downstream cellular events in determining biological outcomes of drug-target interactions.
- To investigate the mechanisms coupling initial toxic stimuli to cellular responses.
- To understand how cellular response repertoire and damage measures influence toxicity.
Main Methods:
- Analysis of cellular events downstream of drug-target interactions.
- Investigation of the coupling mechanisms between stimulus and response.
- Examination of phenotypic responses in cell models (e.g., HL-60 cells).
Main Results:
- Cellular outcomes are determined by both initial drug-target interactions and subsequent downstream events.
- A coupling mechanism exists between drug-target interactions and cellular responses.
- HL-60 cells exhibit differential responses (terminal differentiation vs. apoptosis) based on toxin concentration.
Conclusions:
- Cellular response to toxic insults is complex, involving downstream events and phenotypic repertoire.
- Understanding these responses offers insights into selective toxicity.
- This knowledge can aid in discovering novel toxins for cancer therapy.