1,1'-[oxybis(ethyleneoxy)]diethylene

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in mammalian cells

Remarks:

Type of genotoxicity: gene mutation

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

2011-05-23 to 2011-07-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study with GLP

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

21 July 1997

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.17 (Mutagenicity - In Vitro Mammalian Cell Gene Mutation Test)

Version / remarks:

30 May 2008

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.5300 - In vitro Mammalian Cell Gene Mutation Test

Version / remarks:

August 1998

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of assay:

mammalian cell gene mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

765-12-8

EC Number:

616-344-5

Cas Number:

765-12-8

IUPAC Name:

765-12-8

Method

Species / strain

Species / strain / cell type:

Chinese hamster Ovary (CHO)

Metabolic activation:

with and without

Metabolic activation system:

phenobarbital and β-naphthoflavone induced S9 mix

Test concentrations with justification for top dose:

1st Experiment
without S9 mix (4-hour exposure period): 0; 131.3; 262.5; 525.0; 1050.0; 2100.0 μg/mL
with S9 mix (4-hour exposure period): 0; 131.3; 262.5; 525.0; 1050.0; 2100.0 μg/mL

2nd Experiment
without S9 mix (24-hour exposure period): 0; 131.3; 262.5; 525.0; 1050.0; 2100.0 μg/mL
with S9 mix (4-hour exposure period): 0; 250.0; 500.0; 1 000.0; 1500.0; 2100.0 μg/mL

Vehicle / solvent:

- Vehicle(s)/solvent(s) used: Culture medium (Ham's F12)
- Justification for choice of solvent/vehicle: Due to the good solubility of the test substance in water, culture medium (Ham's F12) was
used as most suitable vehicle.

Controls

Controls 1

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

ethylmethanesulphonate

Remarks:

Migrated to IUCLID6: Without metabolic activation

Controls 2

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: Methylcholanthrene (With metabolic activation)

Details on test system and experimental conditions:

METHOD OF APPLICATION: in medium

DURATION
- Exposure duration: 4-hour and 24-hour
- Expression time (cells in growth medium): 6 - 8 days
- Selection time: 1 week

SELECTION AGENT: 6-thioguanine (10 μg/mL)
STAIN: Giemsa

NUMBER OF REPLICATIONS: Two independent experiments

DETERMINATION OF CYTOTOXICITY
- Method: cloning efficiency

Evaluation criteria:

A finding is assessed as positive if the following criteria are met:
• Increase of the corrected mutation frequencies both above the concurrent negative control values and our historical negative control data range.
• Evidence of reproducibility of any increase in mutant frequencies.
• A statistically significant increase in mutant frequencies and the evidence of a doseresponse
relationship.
Isolated increases of mutant frequencies above our historical negative control range or isolated statistically significant increases without a dose-response relationship may indicate a biological effect but are not regarded as sufficient evidence of mutagenicity.
The test substance is considered non-mutagenic according to the following criteria:
• The corrected mutation frequency in the dose groups is not statistically significant
increased above the concurrent negative control and is within our historical negative
control data range.

Statistics:

Due to the clearly negative findings, a statistical evaluation was not carried out.

Results and discussion

Test results

Species / strain:

Chinese hamster Ovary (CHO)

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity nor precipitates, but tested up to recommended limit concentrations

Vehicle controls validity:

not applicable

Untreated negative controls validity:

valid

Positive controls validity:

valid

Additional information on results:

Cell morphology:
There were no adverse observations on cell morphology

Treatment conditions:
Osmolarity and pH values were not influenced by test substance treatment. In this study, in the absence and the presence of S9 mix no precipitation in culture medium was observed up to the highest applied test substance concentrations.

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information):
negative