Piperonyl butoxide mutagenicity in human RSa cells
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1Department of Toxicology, Tokyo Metropolitan Research Laboratory of Public Health, Japan.
Abstract:
Piperonyl butoxide (PB) is used as a pesticide synergist and food additive. Its chemically induced mutagenicity was found in cultured human RSa cells by determination of ouabain-resistant (Ouar) phenotypic mutation, with the highest frequency at the concentration of 0.2 microgram/ml. Moreover, K-ras codon 12 mutations in genomic DNA, analyzed by polymerase chain reaction (PCR) and differential dot-blot hybridization using digoxigenin-labeled probes, were detected in RSa cells 6 days after exposure to PB (0.03-0.40 microgram/ml).
Insights
Piperonyl butoxide (PB) causes mutagenicity in human cells, inducing specific gene mutations. This pesticide synergist demonstrated a dose-dependent effect on cell mutation frequency.
Area of Science:
- Toxicology
- Molecular Biology
- Genetics
Background:
- Piperonyl butoxide (PB) is widely used as a pesticide synergist and food additive.
- Understanding the genotoxic potential of PB is crucial for public health and safety.
Purpose of the Study:
- To investigate the chemically induced mutagenicity of Piperonyl butoxide (PB) in cultured human cells.
- To identify specific genetic alterations, including K-ras mutations, following PB exposure.
Main Methods:
- Human RSa cells were exposed to varying concentrations of PB.
- Ouabain-resistant (Ouar) phenotypic mutations were determined.
- K-ras codon 12 mutations in genomic DNA were analyzed using polymerase chain reaction (PCR) and differential dot-blot hybridization.
Main Results:
- PB induced mutagenicity in human RSa cells, with the highest mutation frequency observed at 0.2 microgram/ml.
- K-ras codon 12 mutations were detected in RSa cells 6 days after exposure to PB concentrations ranging from 0.03 to 0.40 microgram/ml.
- A dose-dependent relationship was observed for PB-induced mutations.
Conclusions:
- Piperonyl butoxide exhibits mutagenic properties in human cells.
- PB exposure can lead to specific genetic mutations, including K-ras mutations, highlighting potential genotoxic risks.
- Further research is warranted to assess the long-term health implications of PB exposure.