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Mutation induction by 125iodoacetylproflavine, a DNA-intercalating agent, in human cells
J M Whaley1, A I Kassis, B M Kinsey
1Department of Cancer Biology, Harvard School of Public Health, Boston, MA 02115.
International Journal of Radiation Biology
|June 1, 1990
Summary
The DNA-intercalating agent 125iodoacetylproflavine (125IAP) was studied for its mutagenic effects in human cells. While it caused mutations, its effectiveness per decay was lower than other agents, possibly due to its binding method.
Area of Science:
- Molecular toxicology
- Cellular mutation studies
- Radiochemistry
Background:
- DNA-intercalating agents are crucial in understanding DNA damage and mutation induction.
- Radioiodinated compounds are used to study DNA-drug interactions and genotoxicity.
- TK6 human lymphoblastoid cells provide a model for assessing mutagenicity.
Purpose of the Study:
- To evaluate the genotoxic potential of 125iodoacetylproflavine (125IAP) in human cells.
- To compare the mutagenic effectiveness of 125IAP with other radioiodinated compounds.
- To investigate the types of DNA mutations induced by 125IAP.
Main Methods:
- Treatment of TK6 human lymphoblastoid cells with 125IAP.
- Measurement of cell survival and mutation induction at hprt and tk loci.
- Molecular analysis of induced mutations using Southern blot.
Main Results:
- 125IAP was effectively taken up by cells and localized to the nucleus.
- Treatment resulted in a D0 of 110 decays/cell and induced mutant fractions at hprt and tk loci.
- A high proportion of large-scale DNA changes were observed at the hprt locus in mutants.
Conclusions:
- 125IAP induces mutations in human lymphoblastoid cells, with a preference for large-scale DNA alterations.
- Compared to 125IdUrd, 125IAP exhibits reduced mutagenic effectiveness per decay.
- The non-covalent binding of 125IAP may contribute to its lower energy deposition and reduced genotoxicity.