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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:
key study
Study period:
29 January 1982
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1982
Report date:
1982

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
Deviations:
no
Principles of method if other than guideline:
None
GLP compliance:
no
Type of assay:
bacterial reverse mutation assay

Test material

Constituent 1
Chemical structure
Reference substance name:
Disodium 2-[[5-carbamoyl-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl]azo]-4-[[4-[(2-chloro-5-sulphonatophenyl)amino]-6-fluoro-1,3,5-triazin-2-yl]amino]benzenesulphonate
EC Number:
278-154-5
EC Name:
Disodium 2-[[5-carbamoyl-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl]azo]-4-[[4-[(2-chloro-5-sulphonatophenyl)amino]-6-fluoro-1,3,5-triazin-2-yl]amino]benzenesulphonate
Cas Number:
75268-65-4
Molecular formula:
C24H21ClFN9O9S2.2Na
IUPAC Name:
disodium 2-[(5-carbamoyl-1-ethyl-2-hydroxy-4-methyl-6-oxo-1,6-dihydropyridin-3-yl)diazenyl]-4-({4-[(2-chloro-5-sulfonatophenyl)amino]-6-fluoro-1,3,5-triazin-2-yl}amino)benzenesulfonate
Test material form:
solid: particulate/powder
Specific details on test material used for the study:
FAT 40138/B

Method

Target gene:
Histidine-auxotrophic strains of Salmonella typhimurium and on a tryptophan-auxotrophic strain of E. coli.
Species / strain
Species / strain / cell type:
other: TA 98, TA 100, TA 1535, TA 1537 and TA 1538, strains of Salmonella typhimurium and strain E. coli WP2 uvrA
Metabolic activation:
with and without
Metabolic activation system:
S9 liver microsomal fraction from rats
Test concentrations with justification for top dose:
5, 10, 50, 100, 500, 1000 and 5000 µg/0.1 ml.
Vehicle / solvent:
Sodiumphosphate buffer
Controlsopen allclose all
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
not specified
Positive controls:
yes
Positive control substance:
2-nitrofluorene
Remarks:
Without S9: TA 98 and TA 1538
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
N-ethyl-N-nitro-N-nitrosoguanidine
Remarks:
Without S9: TA 100 and TA 1535
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
other: aminoacridine hydrochloride monohydrate
Remarks:
Without S9: TA 1537
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
N-ethyl-N-nitro-N-nitrosoguanidine
Remarks:
Without S9: E. coli WP2 uvrA
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
other: 2-aminoanthracene
Remarks:
With S9: TA 98 TA 1538 TA 100 TA 1535 TA 1537 and E. coli WP2 uvrA
Details on test system and experimental conditions:
TEST SYSTEM:
The bacteria on which the tests were performed were the histidine-auxotrophic TA 98, TA 100, TA 1535, TA 1537 and TA 1538, strains of Salmonella typhimurium and the tryptophan-auxotrophic strain E. coli WP2 uvrA.
Evaluation criteria:
The test substance is generally considered to be non-mutagenic if the colony count in relation to the negative control is not doubled at any concentration.
Statistics:
When the colonies had been counted, the arithmetic mean was calculated.

Results and discussion

Test results
Key result
Species / strain:
other: Salmonella typhimurium strains TA 1535, TA 1537, TA 1538, TA 98, TA 100 and E. coli WP2 uvrA
Metabolic activation:
with and without
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
no cytotoxicity
Vehicle controls validity:
valid
Untreated negative controls validity:
not examined
Positive controls validity:
valid
Remarks on result:
other: All strains were used

Any other information on results incl. tables

In the experiments performed without and with microsomal activation, comparison of the number of histidine- or tryptophan-prototrophic mutants in the controls and after treatment with FAT 40138/B revealed no marked differences.

Applicant's summary and conclusion

Conclusions:
FAT 40138/B is considered to be non-mutagenic in the bacterial reverse mutation assay.
Executive summary:

A study was performed to investigate the potential of FAT 40138/B to induce gene mutations according to the bacterial reverse mutation assay using the Salmonella typhimurium strains TA 1535, TA 1537, TA1538, TA 98, TA 100 and E. coli WP2 uvrA. The study was carried out equivalent or similar to OECD guideline 471. The test article was tested at 5, 10, 50, 100, 500, 1000 and 5000 µg/0.1 ml concentrations with and witout metabolic activation. Comparison of the number of histidine- or tryptophan-prototrophic mutants in the controls and after treatment with FAT 40 138/B revealed no marked differences in both experiments performed with and without metabolic activation. Appropriate reference mutagens were used as positive controls and showed a distinct increase of induced revertant colonies. In conclusion, under the experimental conditions reported, the test article did not induce gene mutations. Therefore, FAT 40138/B is considered to be non-mutagenic in this bacterial reverse mutation assay.