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Toxicological information

Genetic toxicity: in vitro

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Administrative data

Endpoint:
in vitro gene mutation study in bacteria
Remarks:
Type of genotoxicity: gene mutation
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Cross-referenceopen allclose all
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1993
Report Date:
1993

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
Deviations:
no
GLP compliance:
yes
Type of assay:
bacterial reverse mutation assay

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
None

Method

Target gene:
No data
Species / strain
Species / strain / cell type:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102
Details on mammalian cell type (if applicable):
None
Additional strain / cell type characteristics:
not specified
Metabolic activation:
with and without
Metabolic activation system:
rat liver S9 mix
Test concentrations with justification for top dose:
Range in the cytotoxicity test
20.6 - 5000 µg/plate
Range in the mutagenicity test
61.7 - 5000 µg/plate
Vehicle / solvent:
- Vehicle(s)/solvent(s) used: Dimethylsulfoxide (Suspension)
Controlsopen allclose all
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
sodium azide
Remarks:
TA 100;TA 1535; without microsomal activation
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
mitomycin C
Remarks:
TA 102;without microsomal activation
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
2-nitrofluorene
Remarks:
TA 98;without microsomal activation
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
other: 9(5)-aminoacridine
Remarks:
TA 1537; without microsomal activation
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
other: 2-aminoanthracene
Remarks:
TA 100,TA 102, TA 98, TA 1537;with microsomal activation
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
True negative controls:
no
Positive controls:
yes
Positive control substance:
cyclophosphamide
Remarks:
TA 1535;with microsomal activation
Details on test system and experimental conditions:
METHOD OF APPLICATION: in agar (plate incorporation)

Preliminary Toxicity/Ranqe-Findinq test
A toxicity test (check for reduction in the number of revertant colonies) was carried out with strain TA 100 without and with microsomal activation at six concentrations of the test substance and one negative control according to Standard Operating Procedures of Genetic Toxicology. The highest concentration applied was 5000 µg/plate. The five lower concentrations decreased by a factor of 3. The plates were inverted and incubated for about 48 hours at 37 ± 1.5 °C in darkness Thereafter, they were evaluated by counting the colonies and determining the background lawn. One plate per test substance concentration, as well as each negative control was used.

Mutagenicity test
The mutagenicity test was performed with strains TA 98, TA 100, TA 102, TA 1535 and TA 1537 without and with microsomal activation according to Standard Operating Procedures of Genetic Toxicology. Each of the five concentrations of the test substance, a negative and a positive control were tested, using three plates per test substance concentration as well as each positive and negative control with each tester strain. The highest concentration applied was 5000 µg/Plate (because of lack of toxicity in the range finding test) and the four lower concentrations were each decreased by a factor of 3. The plates were inverted and incubated for about 48 hours at 37 ± 1.5 °C in darkness. Thereafter, they were evaluated by counting the number of colonies and determining the background lawn.

Evaluation criteria:
The test substance is considered to be mutagenic in this test system if the following conditions are met:
At least a reproducible meaningful increase of the mean number of revertants per plate above that of the negative control at any concentration for one or more of the following strains: S. typhimurium TA 98, TA 100, TA 102, TA 1535 and TA 1537. Generally a concentration-related effect should be demonstrable.
Statistics:
In deviation to the OECD guideline a statistical analysis was not performed. At present the use of statistical methods concerning this particular test system is not generally recommended. No appropriate statistical method is available

Results and discussion

Test results
Species / strain:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102
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
Additional information on results:
None
Remarks on result:
other: strain/cell type:
Remarks:
Migrated from field 'Test system'.

Any other information on results incl. tables

None

Applicant's summary and conclusion

Conclusions:
Interpretation of results (migrated information):
negative

Based on the results of these experiments and on standard evaluation criteria, it is concluded that FAT 46014/G and its metabolites did not induce gene mutations in the strains of S. typhimurium used.
Executive summary:

A key study was performed to investigate the potential of FAT 46014/G to induce gene mutations in in vitro gene mutation (Ames) test using the Salmonella typhimurium strains TA 1535, TA 1537, TA 9B, and TA 100. The assay was performed

with and without liver metabolic activation system. Cibanon Gelb 3R (FAT 46014/G) was tested for mutagenic effects without and with metabolic activation at five concentrations in the range of 61.7 to 5000 µg/plate

In the original experiment carried out without and with metabolic activation, none of the tested concentrations of Cibanon Gelb 3R (FAT 46014/G) led to an increase in the incidence of histidine-prototrophic mutants by comparison with the negative control.

In the confirmatory experiment performed without metabolic activation, again, none of the tested concentrations of Cibanon Gelb 3R (FAT 46014/G) led to an increase in the incidence of histidine-prototrophic mutants by comparison with the negative control.

In the mutagenicity tests without and with metabolic activation, normal background growth was observed. The number of revertant colonies was not reduced. The test substance exerted no toxic effect on the growth of the bacteria.

Based on the results of these experiments and on standard evaluation criteria, it is concluded that Cibanon Gelb 3R (FAT 46014/G) and its metabolites did not induce gene mutations in the strains of S. typhimurium used.