reaction products of diazotized p-amino-acetanilide, coupled with 6-amino-4-hydroxynaphthalene-2-sulfonic acid, subsequently coupled with diazotized 8- aminonaphthalene-2-sulfonic acid and 6-amino-4-hydroxynaphthalene-2-sulfonic acid, sodium salts

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in mammalian cells

Remarks:

Type of genotoxicity: gene mutation

Type of information:

other: read across from similar substance

Adequacy of study:

key study

Study period:

1994

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study well documented, test procedure in accordance with OECD 476 methodes, meets generally accepted scientific principles, acceptable for assessment and GLP compliant. Justification for Read Across will be provided in section 13.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1994

Report date:

1994

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 476 (In Vitro Mammalian Cell Gene Mutation Test)

Deviations:

no

GLP compliance:

yes

Type of assay:

mammalian cell gene mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

Similar substance 2

IUPAC Name:

Similar substance 2

Method

Species / strain

Species / strain / cell type:

Chinese hamster lung fibroblasts (V79)

Details on mammalian cell type (if applicable):

Chinese Hamster ceU line V79, clone 65/3, Dr. D. Wild, Freiburg, Germany

Additional strain / cell type characteristics:

not specified

Metabolic activation:

with and without

Metabolic activation system:

no data

Test concentrations with justification for top dose:

In the preliminary toxicity test with and without metabolic activation 12 concentrations of the tested substance were tested. The concentrations selected ranged from 0.24 to 500.0 µg/ml and separated by 2-fold intervals.
In the part with metabolic activation the highest concentration produced an acute growth inhibition of 62.70%. In the part without metabolic activation the substance exerted a complete growth inhibitory effect at the highest concentration of 500.0 µg/ml. The next lower concentrations of 250.0 and 125.0 µg/ml revealed an acute growth inhibitory effect of 98.46 and 72.56% respectively.

Accordingly, four concentrations were selected for the original experiment ranging from 18.52 to 500.0 µg/ml and from 4.63 to 125.0 µg/ml in the presence and absence of metabolic activation, respectively.
In the part with metabolic activation, the growth inhibition determined after treatment at the highest concentration of 500.0 µg/ml showed a mean value of 6.91%. After expression growth was inhibited by 13.51%.
In the absence of metabolic activation no significant growth inhibitory effect was seen after treatment and expression.
The highest concentration of 500.0 µg/ml tested in the original experiment with activation was determined to be the highest suitable concentration due to solubility limitations in the vehicle. Therefore the same concentration range was tested in the respective confirmatory experiment, although no severe toxiticy was reached. In the part without metabolic activation a concentration range of 9.26 to 250.0 µg/ml was selected for the confirmatory experiment in order to reach a more pronounced toxicity at the highest concentration. In the presence of metabolic activation no significant acute cytotoxicity was obtained at the highest concentration. After expression growth was inhibited by 9.54%.
In the part without activation, the mean growth inhibition at the highest concentration of 250.0 µg/ml was 27.91% in spite of the increased concentration.

Vehicle / solvent:

No data

Controls

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

not specified

Evaluation criteria:

Cytotoxicity is determined measuring the relative cloning efficiency (survival) of the cultures after the treatment period.
Mutant frequency is determined by seeding known numbers of cells in medium containing the selective agent to detect mutant cells, and in medium without selective agent to determine the cloning efficiency (viability).
After the incubation time, colonies are counted. The mutant frequency is derived from the number of mutant colonies in selective medium and the number of colonies in non-selective medium.

Statistics:

No data

Results and discussion

Test results

Species / strain:

Chinese hamster lung fibroblasts (V79)

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

other: strain/cell type: cell line V79, clone 65/3

Remarks:

Migrated from field 'Test system'.

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information):
negative without metabolic activation
negative with metabolic activation

Based on the results of the performed experiments and under the given experimental conditions, it is concluded that the tested substance and its metabolites did not show any mutagenic activity in this forward mutation system.

Executive summary:

similar substance 2 was tested for mutagenicity, in details for the evalutation of properties to induce gene mutations.

The mutagenicity studies were conducted following OECD 476, gene mutation test with Chinese Hamster cell V79.

The studies were performed in the absence and in the presence of metabolic activation. A dose range with different doses was used. The tested substance shows no mutagenic activity.