[Name confidential or not available]

Genetic toxicity: in vitro

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

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: guideline study and GLP

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Report date:

2008

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 471 (Bacterial Reverse Mutation Assay)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Method

Target gene:

TA 1537: his C 3076; rfa-; uvrB-:, frame shift mutations
TA 98: his D 3052; rfa-; uvrB-;R-factor, frame shift mutations
TA 1535: his G 46; rfa-; uvrB-:, base-pair substitutions
TA 100: his G 46; rfa-; uvrB-;R-factor, base-pair substitutions
WP2 uvrA: trp-;uvrA-:, base-pair substitutions and others

Species / strain

Species / strain 1

Species / strain / cell type:

S. typhimurium TA 1535, TA 1537, TA 98 and TA 100

Additional strain / cell type characteristics:

not applicable

Species / strain 2

Species / strain / cell type:

E. coli WP2 uvr A

Additional strain / cell type characteristics:

not applicable

Metabolic activation:

with and without

Metabolic activation system:

rat liver S 9 mix (Phenobarbital/beta-Naphthoflavone induced rat liver S9)

Test concentrations with justification for top dose:

Pre-Experiment/Experiment I: 3; 10; 33; 100; 333; 1000; 2500; and 5000 µg/plate
Experiment II: 10; 33; 100; 333; 1000; 2500; and 5000 µg/plate

Vehicle / solvent:

DMF (Dimethylformamid)

Controls

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: without metabolic activation: sodium azide (NaN3), 4-nitro-o-phenylene-diamine (4-NOPD), methyl methane sulfonate (MMS), with metabolic activation: 2-aminoanthracene (2-AA)

Results and discussion

Test results

Test results 1

Species / strain:

S. typhimurium TA 1535, TA 1537, TA 98 and TA 100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

in highest concentration esp. with S9 mix

Vehicle controls validity:

valid

Untreated negative controls validity:

other: negative control valid, no true negative control tested

Positive controls validity:

valid

Test results 2

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

in highest concentration esp. with S9 mix

Vehicle controls validity:

valid

Untreated negative controls validity:

other: negative control valid, no true negative control tested

Positive controls validity:

valid

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Any other information on results incl. tables

No substantial increase in revertant colony numbers of any of the five tester strains was observed following treatment with SAT 080003 at any dose level, neither in the presence nor absence of metabolic activation (S9 mix). There was also no tendency of higher mutation

rates with increasing concentrations in the range below the generally acknowledged border of biological relevance.

Appropriate reference mutagens were used as positive controls. They showed a distinct increase of induced revertant colonies.

In conclusion, it can be stated that during the described mutagenicity test and under the experimental conditions reported, the test item did not induce gene mutations by base pair changes or frameshifts in the genome of the strains used.

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information):
negative

In conclusion, it can be stated that during the described mutagenicity test and under the experimental conditions reported, the test item did not induce gene mutations by base pair changes or frameshifts in the genome of the strains used.
Therefore, SAT 080003 is considered to be non-mutagenic in this Salmonella typhimurium and Escherichia coli reverse mutation assay.

Executive summary:

This study was performed to investigate the potential of SAT 080003 to induce gene mutations in the plate incorporation test (experiment I) and the pre-incubation test (experiment II) using the Salmonella typhimurium strains TA 1535, TA 1537, TA 98, and

TA 100, and the Escherichia coli strain WP2 uvrA.

The assay was performed in two independent experiments both with and without liver microsomal activation. Each concentration, including the controls, was tested in triplicate. The test item was tested at the following concentrations:

Pre-Experiment/Experiment I:       3; 10; 33; 100; 333; 1000; 2500; and 5000 Mg/plate

Experiment II:                             10; 33; 100; 333; 1000; 2500; and 5000 Mg/plate

The plates incubated with the test item showed normal background growth up to 5000 mg/plate with and without metabolic activation in both independent experiments.

Minor toxic effects, evident as a reduction in the number of revertants (below the indication factor of 0.5), occurred in all strains.

No substantial increase in revertant colony numbers of any of the five tester strains was observed following treatment with SAT 080003 at any dose level, neither in the presence nor absence of metabolic activation (S9 mix). There was also no tendency of higher mutation

rates with increasing concentrations in the range below the generally acknowledged border of biological relevance.

Appropriate reference mutagens were used as positive controls and showed a distinct increase of induced revertant colonies.