1,3-Benzenedisulfonic acid, 4-[[5-(aminocarbonyl)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl]azo]-6-[[4-[[3-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-4-sulfophenyl]amino]-6-chloro-1,3,5-triazin-2-yl]amino]-, trisodium salt

Endpoint summary

Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

The test substance, Reactive Yellow 85, was non mutagenic for all the Salmonella typhimurium as well as Escherichia coli strains with as well as without metabolic activation.

Link to relevant study records

Reference

Endpoint:

in vitro gene mutation study in bacteria

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14.03.2017 – 24.04.2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)

Version / remarks:

Council Regulation (EC) No.440/2008. Published in O.J. L 142, 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of assay:

bacterial reverse mutation assay

Target gene:

gene for histidine or tryptophan synthesis

Species / strain / cell type:

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

Species / strain / cell type:

E. coli WP2 uvr A

Metabolic activation:

with and without

Metabolic activation system:

supernatant of rat liver and a mixture of cofactors

Test concentrations with justification for top dose:

50, 150, 500, 1500, 5000 μgSelection of doses/toxicity: The test substance was dissolved in water for injection till the maximum recommended concentration 5000 μg per 0.1 mL. For toxicity experiment the highest concentration was diluted to the other 5 concentrations in 3 digit places interval. Although no particles could be observed in higher concentrations due to dark colour of solutions, no particles were observable in top agar and Petri dishes.

Vehicle / solvent:

Water for injection, Ardeapharma, Lot. No.: 1508310536, exp. 08/2017- Justification for choice of solvent/vehicle: solubility of the substance

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

Remarks:

water

Positive controls:

yes

Positive control substance:

sodium azide

Remarks:

(AS)

Positive controls:

yes

Positive control substance:

other: 4-nitro-o-phenylenediamine

Remarks:

(NPD)

Positive controls:

yes

Positive control substance:

other: 2-aminofluorene

Remarks:

(2-AF)

Positive controls:

yes

Positive control substance:

other: 2-aminoanthracene

Remarks:

(2-AA)

Positive controls:

yes

Positive control substance:

other: N-methyl-N´-nitro-N-nitrosoguanidine

Remarks:

(MNNG)

Positive controls:

yes

Positive control substance:

other: 9-aminoacridine hydrochloride monohydrate

Remarks:

(9-AAc)

Details on test system and experimental conditions:

The bacterial tester strains Salmonella typhimurium TA 1535 (CCM 3814, lot. No. 2101200916917), TA 98 (CCM 3811, lot No. 01022001220053), TA 100 (CCM 3812, lot No. 0102201220054) and TA 1537 (CCM 3815, lot No. 2101200916918) as well as Escherichia coli WP2 uvrA (CCM 4751, lot No. 2104200512732),were obtained from Czech Collection of Microorganisms (CCM) of Masaryk University, Brno.Strains TA 98 and TA 1537 detect frame shift mutations, strains TA 100 and TA 1535 serve to detection of base-pair substitution mutations, and strain E.coli WP2uvrA detects cross-linking mutagensMETHOD OF APPLICATION: in medium; in agar (plate incorporation)NUMBER OF REPLICATIONS: two seriesDETERMINATION OF CYTOTOXICITY- Method: relative total growth

Evaluation criteria:

The main criterion for evaluation of results was modified two-fold increase rule, which is compatible with the application of statistical methods (see below). After this rule the result is positive, if a reproducible doseresponse effect occurs and/or a doubling of the ratio Rt/Rc is reached.

Statistics:

For the evaluation of results, the modified two-fold increase rule was used, which is compatible with the application of statistical methods:Dunkel V. C.. Chu K.C. (1980): Evaluation of methods for analysis of microbial mutagenicity assays in The Predictive Value of Short-Term Screening Tests in Carcinogenicity Evaluation. Elsevier North-Holland Biomedical Press. 231 - 417Claxton L. D. et al. (1987): Guide for the Salmonella typhimurium/mammalian microsome tests for bacterial mutagenicity. Mutat. Res. 189. 83 - 91

Key result

Species / strain:

S. typhimurium TA 1535

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Key result

Species / strain:

S. typhimurium TA 1537

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Key result

Species / strain:

S. typhimurium TA 98

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Key result

Species / strain:

S. typhimurium TA 100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Key result

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Additional information on results:

HISTORICAL CONTROL DATA: Each experiment included corresponding positive (reference mutagens) and negative controls (untreated control, solvent control). Untreated controls contain no solvent and negative controls contain 0.1 mL of water. All the control numbers were compared with historical ranges of mutant frequencies obtained in our laboratory. The actual numbers were in ranges of the historical numbers. ADDITIONAL INFORMATION ON CYTOTOXICITY:The test substance was dissolved in water for injection till the maximum recommended concentration 5000 μg per 0.1 mL. For toxicity experiment the highest concentration was diluted to the other 5 concentrations in 3 digit places interval. Although no particles could be observed in higher concentrations due to dark colour of solutions, no particles were observable in top agar and Petri dishes. The concentration row was tested for toxicity in strain TA 98 without metabolic activation (see Table B). No toxicity or precipitation was observed in any dose. The concentration of 5000 µg. 0.1 mL-1 was then used as maximum in the first mutagenicity experiments. Further doses were diluted with factor approximately 2-√10.

Conclusions:

Under the above-described experimental design, the test substance, Reactive Yellow 85, was non mutagenic for all the Salmonella typhimurium as well as Escherichia coli strains with as well as without metabolic activation.

Executive summary:

The test substance Reactive Yellow 85 was assayed for the mutagenicity by the Bacterial Reverse Mutation Test. The performed test was based on EU method B.13/14 Mutagenicity – Reverse mutation test using bacteria, which is analogous to the OECD Test Guideline No. 471.

Four indicator Salmonella typhimurium strains TA 98, TA 100, TA 1535, TA 1537 and one indicator Escherichia coli WP2 uvrA strain were used.

The test substance was diluted in water for injection and assayed in doses of 50 - 5000 ug per plate, which were applied to plates in volume of 0.1 mL.

The first mutagenicity experiments were performed without and with metabolic activation using a supernatant of rat liver (30 μL or 100 μL per plate) and a mixture of cofactors by the plate incorporation test with a dose range of 50 – 5000 ug per plate.

To modify experimental conditions and to increase the sensitivity of the assay, the second mutagenicity experiments were performed with pre-incubation and concentrations were shifted towards expected mutagenic doses to obtain a dose-response.

The concurrent positive controls verified the sensitivity of the assay and the metabolising activity of the liver preparations. Mean revertant colony counts for the vehicle controls were within the current historical control range for the laboratory.

In the arrangement given above, the test substance, Reactive Yellow 85, was non-mutagenic for all the used tester strains without as well as with metabolic activation.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (negative)