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Toxicological information

Genetic toxicity: in vitro

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Administrative data

Endpoint:
in vitro gene mutation study in bacteria
Remarks:
Type of genotoxicity: gene mutation
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Data is from peer reviewed publiction

Data source

Reference
Reference Type:
publication
Title:
A Compilation of Two Decades of Mutagenicity Test Results with the Ames Salmonella typhimurium and L5178Y Mouse Lymphoma Cell Mutation Assays
Author:
H. E. Seifried, R. M. Seifried, J. J. Clarke, T. B. Junghans and R. H. C. San
Year:
2006
Bibliographic source:
Chem. Res. Toxicol. 2006, 19, 627-644

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other:
Principles of method if other than guideline:
The Ames salmonella typhirium mutagenicity test was conducted for chemical C.I. direct red 80
GLP compliance:
not specified
Type of assay:
bacterial gene mutation assay

Test material

Constituent 1
Reference substance name:
C.I. direct red 80
IUPAC Name:
C.I. direct red 80
Constituent 2
Reference substance name:
Hexasodium 7,7'-(carbonyldiimino)bis[4-hydroxy-3-[[2-sulphonato-4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate]
EC Number:
220-027-3
EC Name:
Hexasodium 7,7'-(carbonyldiimino)bis[4-hydroxy-3-[[2-sulphonato-4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate]
Cas Number:
2610-10-8
IUPAC Name:
hexasodium 4-hydroxy-7-({[5-hydroxy-7-sulfonato-6-({2-sulfonato-4-[(4-sulfonatophenyl)diazenyl]phenyl}diazenyl)-2-naphthyl]carbamoyl}amino)-3-({2-sulfonato-4-[(4-sulfonatophenyl)diazenyl]phenyl}diazenyl)naphthalene-2-sulfonate
Details on test material:
- Name of test material (as cited in study report): C.I. direct red 80
- Molecular formula (if other than submission substance): C45H32N10O21S6.6Na
- Molecular weight (if other than submission substance): 1373.09 g/mol
- Substance type: Organic
- Physical state: Solid
Purity: No data available
- Impurities (identity and concentrations):No data available

Method

Target gene:
Histidine auxotrophs
Species / strain
Species / strain / cell type:
S. typhimurium, other: TA98, TA100, TA1535, TA1537, and TA1538
Details on mammalian cell type (if applicable):
No applicable
Additional strain / cell type characteristics:
not specified
Metabolic activation:
with and without
Metabolic activation system:
Liver S9 homogenate was prepared from male Sprague-Dawley rats and Syrian golden hamsters that had been injected with Aroclor 1254 at 500 mg/kg body weight.
Test concentrations with justification for top dose:
333- 10000 µg/plate
Vehicle / solvent:
- Vehicle(s)/solvent(s) used:Yes, no detailed data available
- Justification for choice of solvent/vehicle: No data available
Controls
Untreated negative controls:
not specified
Negative solvent / vehicle controls:
not specified
True negative controls:
not specified
Positive controls:
not specified
Positive control substance:
not specified
Details on test system and experimental conditions:
METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Preincubation period: No data available
- Exposure duration: 48 h
- Expression time (cells in growth medium): 48 h
- Selection time (if incubation with a selection agent): No data available
- Fixation time (start of exposure up to fixation or harvest of cells): No data available

SELECTION AGENT (mutation assays): No data available
SPINDLE INHIBITOR (cytogenetic assays): No data available

STAIN (for cytogenetic assays): No data available

NUMBER OF REPLICATIONS: Triplicate

NUMBER OF CELLS EVALUATED: No data available

DETERMINATION OF CYTOTOXICITY
- Method: mitotic index; cloning efficiency; relative total growth; other: No data available

OTHER EXAMINATIONS:
- Determination of polyploidy: No data available
- Determination of endoreplication: No data available
- Other: No data available

OTHER: No data available
Evaluation criteria:
The criteria used to evaluate a test were as follows: for a test article to be considered positive, it had to induce at least a doubling (TA98, TA100, and TA1535) in the mean number of revertants per plate of at least one tester strain. This increase in the mean revertants per plate had to be accompanied by a dose response to increasing concentrations of the test chemical. If the study showed a dose response with a less than 3-fold increase on TA1537 or TA1538, the response had to be confirmed in a repeat experiment.
Statistics:
No data available

Results and discussion

Test results
Species / strain:
S. typhimurium, other: TA98, TA100, TA1535, TA1537, and TA1538
Metabolic activation:
with and without
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
not specified
Vehicle controls validity:
not specified
Untreated negative controls validity:
not specified
Positive controls validity:
not specified
Additional information on results:
Additional information on results

RANGE-FINDING/SCREENING STUDIES:
The doses that were tested in the mutagenicity assay were selected based on the levels of cytotoxicity observed in a preliminary dose range-finding study using strain TA100. Ten dose levels of the chemical, one plate per dose, were tested in both the presence and the absence of induced hamster S9. If no toxicity was observed, a total maximum dose of 10 mg of test chemical per plate was used.
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 with and without

The test compound C. I. direct red 80 failed to induce mutation in the Salmonella typhirium TA98, TA100, TA1535, TA1537, and TA1538 both in the presence and absence of S9 activation system and hence is not likely to be a gene mutant.
Executive summary:

Ames mutagenicity test was conducted for chemical C. I. direct red 80to evaluate its genetoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA1535, TA1537, and TA1538 with dose concentration of 333-10000 µg/plate in plate incorporation assay. Based on the preliminary study conducted, the test compound was used at a five dose level from 333- 10000 µg/plate.

 

The test compound C. I. direct red 80 failed to induce mutation in theSalmonella typhirium TA98, TA100, TA1535, TA1537, and TA1538 both in the presence and absence of S9 activation system and hence is not likely to be a gene mutant.

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