Reaction mass of 3H-Indolium, 2-[[2-(4-methoxyphenyl)-2-methylhydrazinylidene]methyl]-1,3,3-trimethyl- and acetate

Endpoint summary

Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

Gene mutation in vitro:

Ames test:

Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate does not induce gene mutation in the Salmonella typhimurium strains used in the presence and absence of S9 metabolic activation system and hence it is not likely to be mutagenic in vitro.

Link to relevant study records

Reference

Endpoint:

in vitro gene mutation study in bacteria

Type of information:

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

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

experimental data of read across substances

Justification for type of information:

Data for the target chemical is summarized based on the structurally similar read across chemicals

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Qualifier:

according to guideline

Guideline:

other: Refer below principle

Principles of method if other than guideline:

WoE report is based on three gene mutation in vitro toxicity studies as- 1 and 2. The Ames Salmonella typhimurium mutagenicity test was conducted for the test chemicals

GLP compliance:

not specified

Type of assay:

bacterial reverse mutation assay

Target gene:

Histidine

Species / strain / cell type:

S. typhimurium, other: TA98, TA100, TA102, and TA1535

Remarks:

RA 1/ RA 2

Details on mammalian cell type (if applicable):

Not applicable

Additional strain / cell type characteristics:

not specified

Cytokinesis block (if used):

No data

Metabolic activation:

with and without

Metabolic activation system:

S9 metabolic activation system

Test concentrations with justification for top dose:

1. 5–5000 μg/plate2. 5–5000 μg/plate

Vehicle / solvent:

1 and 2. No data

Untreated negative controls:

not specified

Negative solvent / vehicle controls:

not specified

True negative controls:

not specified

Positive controls:

yes

Positive control substance:

2-acetylaminofluorene

sodium azide

mitomycin C

Remarks:

RA 1

Untreated negative controls:

not specified

Negative solvent / vehicle controls:

not specified

True negative controls:

not specified

Positive controls:

yes

Positive control substance:

sodium azide

mitomycin C

other: 2-aminofluorene for all the strains with S9 mix

Remarks:

RA 2

Details on test system and experimental conditions:

1 and 2. METHOD OF APPLICATION: in agar (plate incorporation) with preincubation modificationDURATION- 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 availableSELECTION AGENT (mutation assays): No data availableSPINDLE INHIBITOR (cytogenetic assays): No data availableSTAIN (for cytogenetic assays): No data availableNUMBER OF REPLICATIONS: TriplicateNUMBER OF CELLS EVALUATED: No data availableDETERMINATION OF CYTOTOXICITY- Method: mitotic index; cloning efficiency; relative total growth; other: Yes, the cytotoxicity study were carried out by accounting for the microcolonies(histidine auxotroph) in the background lawn. The sparse or absent growth indicated the toxic nature of dyes toward the tester strains.OTHER EXAMINATIONS:- Determination of polyploidy: No data available- Determination of endoreplication: No data available- Other: No data availableOTHER: No data available

Rationale for test conditions:

No data

Evaluation criteria:

1 and 2. A dose-related increase (at least 2-fold) in revertant colonies was used to define a statistically significant mutagenic response.

Statistics:

No data

Species / strain:

S. typhimurium, other: TA98, TA100, TA102, and TA1535

Remarks:

RA 1

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

≥ 500 μg

Vehicle controls validity:

not specified

Untreated negative controls validity:

not specified

Positive controls validity:

valid

Species / strain:

S. typhimurium, other: TA98, TA100, TA102, and TA1535

Remarks:

RA 2

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

≥ 500 μg

Vehicle controls validity:

not specified

Untreated negative controls validity:

not specified

Positive controls validity:

valid

Additional information on results:

1. and 2. No data

Remarks on result:

other: No mutagenic potential

Conclusions:

Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate does not induce gene mutation in the Salmonella typhimurium strains used in the presence and absence of S9 metabolic activation system and hence it is not likely to be mutagenic in vitro.

Executive summary:

Data available for the test chemicals was reviewed to determine the mutagenic nature of the test chemical Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate . The studies are as mentioned below:

Ames mutagenicity test was conducted for two test chemicals to evaluate its genotoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA102, and TA1535 with dose concentration of 5–5000 µg/plate in plate incorporation assay. The plates were incubated for 48 h. The doses of test chemical, together with the appropriate concurrent positive controls, were tested in triplicate on each tester strain with and without S9 metabolic activation. A dose-related increase (at least 2-fold) in revertant colonies was used to define a statistically significant mutagenic response. Both the test chemicals did not induce gene mutation in the Salmonella typhimurium TA98, TA100, TA102, and TA1535 both in the presence and absence of S9 activation system and hence the chemical is not likely to be a gene mutant.

Based on the data summarized, Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate doesnot induce gene mutation in the Salmonella typhimurium strains used in the presence and absence of S9 metabolic activation system and hence it is not likely to be mutagenic in vitro.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (negative)

Genetic toxicity in vivo

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Gene mutation in vitro:

Data available for the test chemicals was reviewed to determine the mutagenic nature of the test chemical Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate. The studies are as mentioned below:

Ames mutagenicity test was conducted for two test chemicals to evaluate its genotoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA102, and TA1535 with dose concentration of 5–5000 µg/plate in plate incorporation assay. The plates were incubated for 48 h. The doses of test chemical, together with the appropriate concurrent positive controls, were tested in triplicate on each tester strain with and without S9 metabolic activation. A dose-related increase (at least 2-fold) in revertant colonies was used to define a statistically significant mutagenic response. Both the test chemicals did not induce gene mutation in the Salmonella typhimurium TA98, TA100, TA102, and TA1535 both in the presence and absence of S9 activation system and hence the chemical is not likely to be a gene mutant.

Based on the data summarized, 2-[(4-methoxybenzyl)carbonohydrazonoyl]-1,3,3-trimethyl-3H-indolium acetate (CAS no 58798 -47 -3) does not induce gene mutation in the Salmonella typhimurium strains used in the presence and absence of S9 metabolic activation system and hence it is not likely to be mutagenic in vitro.

 

Based on the data available from the read across, Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate does not exhibit gene mutation in vitro. Hence the test chemical is not likely to classify as a gene mutant as per the criteria mentioned in CLP regulation.

Justification for classification or non-classification

Based on the data available from the read across, Reaction mass of 3H-​Indolium, 2-​[[2-​(4-​methoxyphenyl)​-​2-​methylhydrazinyliden​e]​methyl]​-​1,​3,​3-​trimethyl-​ & acetate does not exhibit gene mutation in vitro. Hence the test chemical is not likely to classify as a gene mutant as per the criteria mentioned in CLP regulation.