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DNA damage by tobacco smoke and some antiblastic drugs evaluated using the Comet assay
P Poli1, A Buschini, A Spaggiari
1Istituto di Genetica, Università degli Studi di Parma, Italy. mutgen@unipr.it
Abstract:
The Comet assay was used in human leukocytes to detect, in vivo, DNA strand-breaks induced by smoking habit to evaluate the test sensitivity to an environmental factor, and by several antiblastic drugs to note their effectiveness at single cell level. Differences related to smoking habit, gender and age are evident. Melphalan shows the widest DNA damage. The damage induced by etoposide can be ascribed to the balancing between the production of strand-breaks and cross-links which limit the migration of DNA fragments. Interferon, fludarabine, prednisone, and oncocarbide appear to induce unexpected strand-breaks. Single cell gel electrophoresis (SCGE) is highly effective in revealing the association between DNA damage and environmental, genetic, and acquired factors, providing further data on the possible applicability of this assay in genotoxic human surveillance in addition to established tests. Moreover, the ability to point out cell subpopulations varying in mean damage levels could allow detection of potentially emerging drug-resistant populations.
Insights
The Comet assay effectively detects DNA damage in human leukocytes from environmental factors like smoking and various cancer drugs. This method shows promise for genotoxic surveillance and identifying drug resistance in cell populations.
Area of Science:
- Biochemistry
- Genetics
- Toxicology
Background:
- Environmental factors and drug treatments can induce DNA strand-breaks in human leukocytes.
- Assessing DNA damage at the single-cell level is crucial for understanding genotoxicity and treatment efficacy.
- The Comet assay, also known as single-cell gel electrophoresis (SCGE), is a potential tool for monitoring DNA damage.
Purpose of the Study:
- To evaluate the Comet assay's sensitivity in detecting in vivo DNA strand-breaks induced by smoking.
- To assess the effectiveness of various antiblastic drugs on DNA at the single-cell level.
- To explore the applicability of SCGE in genotoxic human surveillance and drug resistance detection.
Main Methods:
- Human leukocytes were analyzed using the Comet assay (SCGE).
- DNA strand-breaks were measured following exposure to smoking (environmental factor) and several antiblastic drugs.
- Differences in DNA damage were analyzed concerning smoking habit, gender, and age.
Main Results:
- Significant differences in DNA damage were observed related to smoking habit, gender, and age.
- Melphalan induced the most extensive DNA damage.
- Etoposide's effect involved a balance between strand-breaks and cross-links.
- Interferon, fludarabine, prednisone, and oncocarbide unexpectedly induced strand-breaks.
- SCGE effectively revealed associations between DNA damage and various factors.
Conclusions:
- The Comet assay (SCGE) is highly effective for detecting DNA damage from environmental and drug-induced factors in human leukocytes.
- SCGE shows potential for genotoxic human surveillance and identifying drug-resistant cell subpopulations.
- The assay provides valuable data on individual susceptibility and treatment responses.