Trisodium bis [5-nitro-2-oxido-3-((E)-((Z)-3-oxido-1-oxo-1-(phenylamino)but-2-en-2-yl)diazenyl)benzenesulfonate (2-) chromate3-)]

Genetic toxicity: in vivo

Administrative data

Endpoint:

in vivo mammalian somatic cell study: cytogenicity / erythrocyte micronucleus

Remarks:

Type of genotoxicity: gene mutation

Type of information:

other: experimental data on similar substance

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study well documented, meets generally accepted scientific principles, acceptable for assessment.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1986

Report date:

1986

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 474 (Mammalian Erythrocyte Micronucleus Test)

Deviations:

not specified

GLP compliance:

yes

Type of assay:

micronucleus assay

Test material

Test material information

Constituent 1

Reference substance name:

Trisodium bis[2-hydroxy-5-nitro-3-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo]benzenesulphonato(3-)]cobaltate(3-)

EC Number:

289-068-2

EC Name:

Trisodium bis[2-hydroxy-5-nitro-3-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo]benzenesulphonato(3-)]cobaltate(3-)

Cas Number:

85959-73-5

Molecular formula:

C32H22CoN8O16S2.3Na

IUPAC Name:

trisodium;cobalt(3+);(2Z)-2-[(5-nitro-2-oxido-3-sulfonatophenyl)hydrazinylidene]-3-oxo-N-phenylbutanimidate

Test animals

Species:

mouse

Strain:

other: OF-1 albino mice

Sex:

male/female

Details on test animals or test system and environmental conditions:

Weight: male/female 25g
Supplier: from a SPF colny IFFA-CREDO, L'Arbresie France
Quarantine period of 1 week, the animals were allowed a libitum access to food (Aliment Rats-Souris Charles River, produced by U.A.R, Villemoisson/Orge France) and drinking water.
Animals were housed 5 of the same sex per cage in Makrolon type III cages.

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

deionised water

Doses / concentrations

Doses / concentrations 1

Remarks:

Doses / Concentrations:
0
Basis:
nominal in water

Doses / concentrations 2

Remarks:

Doses / Concentrations:
500 mg/kg bw
Basis:
nominal in water

No. of animals per sex per dose:

5 mice / sex / Group

Control animals:

yes, concurrent vehicle

Results and discussion

Test results

Sex:

male/female

Genotoxicity:

negative

Toxicity:

no effects

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Additional information on results:

At low magnification of the microscope no neticeable differences in bone marros nucleated cells were observed between animals with FAT20261/D and negative control.
In the positive control group (Thio-TEPA) decreased numbers of nucleated bone marrow cells were noted.

There was no statistically significant increase in the number of micronucleated polychromatic erythrocytes in animals exposed to 500 mg/kg of the tested substance compared to negative controls. In animals treated with positive control there was a statistically significant increased number of micronucleated cells.
The ration of polychromatic to normochromatic erythrocytes was markedly decreased in mice treated with positive control. There is no difference between animals treated with the tested substance and the negative control for this ratio.

Any other information on results incl. tables

In the pre-experiment on acute toxicity with an exposure of 2000 mg/kg bw D&C Orange 4 exclusively a ruffled fur was found up to 4 h after administration. In the main experiment reduction of spontaneous activity, eyelid closure and ruffled fur were found at 2000 mg/kg

bw up to 6 or 24 h (ruffled fur only).

Treatment with D&C Orange 4 did not result in a decreased PCE/NCE ratios compared to the untreated controls indicating that D&C Orange 4 had no cytotoxic properties in the bone marrow.

However, the quantitative analysis of the test item in the plasma of the treated animals showed significant amounts of D&C Orange 4 after 1 h. This level dropped after 4 h.

Biologically relevant or statistically significant increases in the number of micronucleated PCEs compared to the concurrent vehicle controls were not found at any dose tested, neither 24 nor 48 h after treatment and neither for males nor for females.

Applicant's summary and conclusion

Conclusions:

non-mutagenic in micronucleus assay test

Executive summary:

Under the experimental conditions used the tested substance did not induce a biologically relevant increase in the number of PCEs with micronuclei in bone marrow cells of treated mice and, consequently the tested substance is not genotoxic (clastogenic and/or aneugenic) in bone marrow cells of mice.