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Mutation induction by N-propyl-N-nitrosourea in eight MutaMouse organs.
1Hatano Research Institute, Food and Drug Safety Center, 729-5, Ochiai, Hadano-shi, Japan. QZR13317@niftyserve.or.jp
Mutation Research
|October 16, 1999
Summary
N-propyl-N-nitrosourea increased lacZ gene mutations in multiple organs of MutaMouse, with bone marrow showing the highest sensitivity. Mutant frequency varied over time, highlighting organ-specific responses to chemical exposure.
Area of Science:
- Toxicology
- Genetics
- Carcinogenesis
Background:
- The Transgenic Mouse Mutation Assay is crucial for evaluating chemical mutagens.
- Understanding organ specificity and temporal dynamics of mutations is key to predicting carcinogenic risk.
Purpose of the Study:
- To investigate the organ-specific mutagenicity of N-propyl-N-nitrosourea (NPNU).
- To analyze temporal changes in mutant frequency (MF) of the lacZ gene in various tissues.
- To assess the sensitivity of different organs to NPNU-induced mutations.
Main Methods:
- Male MutaMouse were administered NPNU (250 mg/kg) via intraperitoneal injection.
- A positive selection system was employed to detect lacZ gene mutations.
- Eight organs (bone marrow, liver, kidney, lung, spleen, brain, heart, testis) were analyzed for mutant frequency.
Main Results:
- NPNU significantly increased MF in all organs except the brain.
- Bone marrow exhibited the highest sensitivity, with MF 10 times higher than controls by day 7.
- MF increased in liver, kidney, and testis from day 7 to day 28, while decreasing in bone marrow.
Conclusions:
- NPNU is a potent mutagen with significant organ-specific effects.
- Bone marrow is a primary target organ for NPNU-induced mutations.
- Temporal changes in MF suggest complex biological responses to NPNU exposure, relevant to carcinogenesis.