2-({[3-(methylsulfanyl)phenyl]carbamoyl}oxy)ethyl prop-2-enoate

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: GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 471 (Bacterial Reverse Mutation Assay)

Version / remarks:

(1997)

GLP compliance:

yes (incl. QA statement)

Type of assay:

bacterial reverse mutation assay

Test material

Reference

Name:

Unnamed

Type:

Constituent

Method

Target gene:

mutant histidine gene

Species / strain

Species / strain / cell type:

S. typhimurium, other: TA 1535, TA 100, TA 1537, TA 98, TA 102

Metabolic activation:

with and without

Metabolic activation system:

S9-Mix from the liver of Aroclor 1254 induced male Sprague Dawley rats.

Test concentrations with justification for top dose:

plate incorporation assay: 0, 50, 160, 500, 1600, 5000 µg/plate with and without S9 mix
preincubation assay: 0, 4, 12, 36, 108, 324, 972, 2916 µg/tube with and without S9 mix

Vehicle / solvent:

- Vehicle(s)/solvent(s) used: DMSO
- Justification for choice of solvent/vehicle: The test item formed clear colourless solutions in DMSO.

Controls

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Remarks:

DMSO

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: Na-azide (only TA 1535), nitrofurantoin (only TA 100), 4-nitro-1,2-phenylene diamine (TA 1537 and TA 98), mitomycin C (only TA 102 in plate incorporation assay), cumene hydroperoxide (only TA 102 in preincubation assay), 2-aminoanthracene.

Remarks:

The positive controls sodium azide, nitrofurantoin, 4-nitro-1,2-phenylene diamine, mitomycin C and cumene hydroperoxide were only used without S9 mix; the positive control 2-aminoanthracene was only used with S9 mix.

Details on test system and experimental conditions:

METHOD OF APPLICATION: in agar (plate incorporation) for initial testing; independent repeat as preincubation testing (preincubation for 20 min. at 37 °C);
Testing for each strain and dose with and without S9 mix was performed in triplicate, which is also valid for solvent and positive controls.

DETERMINATION OF CYTOTOXICITY
- background growth
- mutant count: A toxic effect was assumed when there was a marked and dose-dependent reduction in the mutant count per plate, compared to the negative controls.

Evaluation criteria:

A reproducible and dose-related increase in mutant counts of at least one strain is considered to be a positive result. For TA 1535, TA 100 and TA 98 this increase should be about twice that of negative controls, whereas for TA 1537, at least a threefold increase should be reached. For TA 102 an increase of about 100 mutants should be reached. Otherwise, the result is evaluated as negative. However, these guidelines may be overruled by good scientific judgment.
In case of questionable results, investigations should continue, possibly with modifications, until a final evaluation is possible.

Results and discussion

Test results

Species / strain:

S. typhimurium, other: TA 1535, TA 100, TA 1537, TA 98, TA 102

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Vehicle controls validity:

valid

Untreated negative controls validity:

not applicable

Positive controls validity:

valid

Additional information on results:

None of the five strains used in the plate incorporation test showed a dose-related and biologically relevant increase in mutant counts over those of the negative controls. This applied both to the tests with and without S9 mix and was confirmed by the results of the preincubation trials.

TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation: Substance precipitation did not occur.

ADDITIONAL INFORMATION ON CYTOTOXICITY: In the plate incorporation test doses of up and including 160 µg per plate did not cause any bacteriotoxic effects. Higher doses had a strain-specific bacteriotoxic effect, so that this range could only partly be used for assessment purposes. In the preincubation test doses of up to and including 108 µg per plate did not cause any bacteriotoxic effects. Total bacteria counts remained unchanged and no inhibition of growth was observed. Higher doses had a strain-specific bacteriotoxic effect, so that this range could only partly be used for assessment purposes.

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Applicant's summary and conclusion

Executive summary:

A bacterial reverse mutation test (Ames) according to OECD TG 471 was conducted with the following tester strains: Salmonella typhimurium TA 1535, TA 100, TA, 1537, TA 98, and TA 102. In this test the substance was non-mutagenic without and with S9 mix in the initially performed plate incorporation as well as in the preincubation modification, performed as independent repeat.