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Toxicological information

Genetic toxicity: in vitro

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Administrative data

Endpoint:
in vitro gene mutation study in bacteria
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Justification for type of information:
Data is from J-check

Data source

Reference
Reference Type:
review article or handbook
Title:
In vitro Genetic toxicity study for α-methylstyrene
Author:
National Institute of Technology and Evaluation.
Year:
2017
Bibliographic source:
Japan chemicals collaborative knowledge database (J-check), 2017

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
JAPAN: Guidelines for Screening Mutagenicity Testing Of Chemicals
Principles of method if other than guideline:
To evaluate the mutagenic potential of α-methylstyrene in Salmonella typhimurium TA100, TA1535, TA98, TA1537 E. coli WP2 uvrA by Bacterial reverse mutation Assay.
GLP compliance:
not specified
Type of assay:
bacterial reverse mutation assay

Test material

Constituent 1
Chemical structure
Reference substance name:
2-phenylpropene
EC Number:
202-705-0
EC Name:
2-phenylpropene
Cas Number:
98-83-9
Molecular formula:
C9H10
IUPAC Name:
2-Phenylpropene
Specific details on test material used for the study:
- Name of test material (as cited in study report): α-methylstyrene
- Molecular formula: C9H10
- Molecular weight: 118.19 g/mol
- Substance type: Organic
- Purity; : 99.6% %

Method

Target gene:
Histidine for Salmonella typhimurium and tryptophan Escherichia coli
Species / strain
Species / strain / cell type:
bacteria, other: Salmonella typhimurium TA100, TA1535, TA98, TA1537 E. coli WP2 uvrA
Details on mammalian cell type (if applicable):
Not applicable
Additional strain / cell type characteristics:
not specified
Cytokinesis block (if used):
not specified
Metabolic activation:
with and without
Metabolic activation system:
Rat liver, induced with phenobarbital and 5,6-benzoflavone
Test concentrations with justification for top dose:
0, 12.5, 25, 50, 100, 200 and 400 µg/plate
Vehicle / solvent:
Vehicle
- Vehicle(s)/solvent(s) used: DMSO
Controls
Untreated negative controls:
not specified
Negative solvent / vehicle controls:
yes
Remarks:
DMSO
True negative controls:
not specified
Positive controls:
yes
Positive control substance:
other: -S9 Mix, AF-2 (TA100, WP2, TA98), sodium azide (TA1535) and 9- aminoacridine (TA1537) +S9 Mix, 2-aminoanthracene (all strains)
Details on test system and experimental conditions:
Details on test system and conditions
METHOD OF APPLICATION: Plate incorporation method
NUMBER OF REPLICATIONS: Duplicate

OTHER EXAMINATIONS: 3 plates per test were observed.
Rationale for test conditions:
Not specified
Evaluation criteria:
Evaluation was done considering a dose dependent increase in the number of revertants/plate.
Statistics:
Not specified.

Results and discussion

Test results
Species / strain:
bacteria, other: Salmonella typhimurium TA100, TA1535, TA98, TA1537 E. coli WP2 uvrA
Metabolic activation:
with and without
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
cytotoxicity
Vehicle controls validity:
valid
Untreated negative controls validity:
not specified
Positive controls validity:
valid
Additional information on results:
Additional information on results
ADDITIONAL INFORMATION ON CYTOTOXICITY: Minimum concentration of test substance at which toxicity was observed:
200µg/plate -S9 Mix
400µg/plate (200µg/plate for TA1537) +S9 Mix
Remarks on result:
other: Nomurtagenic effect were observed

Applicant's summary and conclusion

Conclusions:
α-methylstyrene (98-83-9)was evaluated for its mutagenic potential in Salmonella typhimurium TA100, TA1535, TA98, TA1537 E. coli WP2 uvrA by Bacterial reverse mutation assay. The test result was considered to be negative in all strain in the presence and absence of metabolic activation S9.
Executive summary:

Genetic toxicity in vitro study was assessed for α-methylstyrene . For this purpose AMES test was performed according to Guidelines for Screening Mutagenicity Testing of Chemicals (Japan).The test material was exposed to Salmonella typhimurium TA100, TA1535, TA98, TA1537 E. coli WP2 uvrA in the presence and absence of metabolic activation S9. The concentration of test material used in the presence and absence of metabolic activation0, 12.5, 25, 50, 100, 200 and 400 µg/plate. No mutagenic effects were observed in all strains, in the presence and absence of metabolic activation. Therefore α-methylstyrene was considered to be non mutagenic in Salmonella typhimurium TA100, TA1535, TA98, TA1537 E. coli WP2 uvrA by AMES test. Hence the substance cannot be classified as gene mutant in vitro.