Benzimidazole-2-thiol

Endpoint summary

Key value for chemical safety assessment

Toxic effect type:

concentration-driven

Effects on fertility

Description of key information

Reproductive toxicity study

Based on the data available from different studies, NOAEL for test chemical was considered to be 30 mg/kg /day for reproductive toxicity, when male and female rats were treated with test material orally. Thus, comparing this value with the criteria of CLP regulation test chemical is not likely to classify as reproductive toxicant.

Link to relevant study records

Reference

Endpoint:

one-generation reproductive toxicity

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

Data is from peer- reviewed journal

Qualifier:

equivalent or similar to guideline

Guideline:

other: As mentioned below

Principles of method if other than guideline:

The adverse effects of test chemical on pregnant Wistar rats were examined.

GLP compliance:

not specified

Limit test:

no

Justification for study design:

not specified

Species:

rat

Strain:

Wistar

Details on species / strain selection:

not specified

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: CLEA Japan Inc. (Tokyo, Japan)
- Age at study initiation: Four-week-old
- Housing: Housed individually in stainless steel cages
- Diet (e.g. ad libitum): Feed (NMF, Oriental Yeast Co., Ltd., Tokyo, Japan) ; ad libitum
- Water (e.g. ad libitum): Tap water; ad libitum

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 23 ± 2°C
- Humidity (%):60 ± 10%
- Photoperiod (hrs dark / hrs light): Dark period from 7:00 PM to 7:00 AM

Route of administration:

oral: gavage

Vehicle:

olive oil

Details on exposure:

not specified

Details on mating procedure:

- Impregnation procedure: [artificial insemination / purchased timed pregnant / cohoused]: cohoused
- If cohoused:
- M/F ratio per cage: females were individually paired overnight with a male of similar age.
- Length of cohabitation: overnight
- Further matings after two unsuccessful attempts: no
- Verification of same strain and source of both sexes: no
- Proof of pregnancy: [vaginal plug / sperm in vaginal smear] referred to as [day 0 / day 1] of pregnancy: The day upon which sperm was found in vaginal smears was designated as Day 0 of gestation.

Analytical verification of doses or concentrations:

not specified

Details on analytical verification of doses or concentrations:

not specified

Duration of treatment / exposure:

11 days

Frequency of treatment:

Daily

Details on study schedule:

20 days of gestation

Remarks:

0,2.5,5,10,20,40 and 60 mg/kg bw for dose finding study

Remarks:

0.3.3,10,30 mg/kg bw for teratogenicity study

No. of animals per sex per dose:

Dose-finding study:
Mated (pregnant) rats were assigned to seven groups of five or six animals each.

Teratology study:
Mated (pregnant) rats were divided into four groups of 20 rats each.

Control animals:

yes

Details on study design:

Dose-finding study:
Mated rats were assigned to seven groups of five or six animals each. They were treated by gavage with 2-MBI in oIive oil at 0, 2.5, 5, 10, 20, 40, and 60 mg/kg/day in a volume of 5 ml/kg from Days 7 through 17 of gestation. The animals were weighed and food consumpiion was measured each day; general condition and behavior were also observed. On Day 20 of gestation, the animaIs were killed under diethylether anesthesia, laparotomy was performed, and the maternal thymus and the gravid uterus were weighed. The position and number of live and dead fetuses, including resorbed fetuses, and the number of corpora lutea were recorded. Live fetuses were weighed, sexed, and gross deformities noted. Only one dam treated with 60 mg/kg of test chemical survived; viscera ot the fetuses were examined.

Teratology study:
Dose levels of 0, 3.3, 10, and 30 mg/kg/day in a volume of 5 ml/kg were selected based upon the results of the dose-finding study.
The dose-finding study revealed that 60 mg/kg was toxic to both fetuses and dams when given throughout the period of organogenesis (Days 7-17 of gestation).Therefo re, when mated (pregnant) rats were dosed with 60 mg/kg of test chemical it was given upon 3 or 4 consecutive days at different periods during organogenesis (Days 7— 10, 11 —14, and I 5—17 of gestation). The other procedures were the same as described here.

Positive control:

not specified

Parental animals: Observations and examinations:

BODY WEIGHT: Yes

FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study): Yes

OTHER:
GENERAL CONDITION AND BEHAVIOUR: Yes

ORGAN WEIGHT:
Maternal thymus, thyroid gland, and gravid uterus were weighed.

Oestrous cyclicity (parental animals):

The uterine content was examined after termination: Yes
Examinations included:
- Number of early resorptions: Yes
- Number of corpora lutea were recorded.

Sperm parameters (parental animals):

not specified

Litter observations:

The position and number of live and dead fetuses, including resorbed fetuses were recorded. Live fetuses were weighed, sexed, and gross deformities noted.

Postmortem examinations (parental animals):

GROSS NECROPSY
- Uteri was examined grossly.

Postmortem examinations (offspring):

GROSS NECROPSY
- Fetuses were examined grossly.
- Gross necropsy consisted of Visceral and Skeletal observation.

Statistics:

Data from the dose-finding and teratology studies in which animals were treated with ≤30 mg/kg of test chemical were analyzed by Dunnett’s multiple comparison method in a parametric or nonpararnetric manner.

Reproductive indices:

not specified

Offspring viability indices:

not specified

Clinical signs:

not specified

Dermal irritation (if dermal study):

not specified

Mortality:

no mortality observed

Body weight and weight changes:

effects observed, treatment-related

Food consumption and compound intake (if feeding study):

effects observed, treatment-related

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Behaviour (functional findings):

not specified

Immunological findings:

not specified

Organ weight findings including organ / body weight ratios:

effects observed, treatment-related

Histopathological findings: non-neoplastic:

not specified

Histopathological findings: neoplastic:

not specified

Other effects:

not specified

Reproductive function: oestrous cycle:

not specified

Reproductive function: sperm measures:

not specified

Reproductive performance:

no effects observed

Mortality:
Teratology study: All dams survived.
Dose-finding study: Four of five rats treated with 60 mg/kg dose and one of six rats treated with 40 mg/kg died.
Body weight:
Teratology study: Substantial decrease in body weight gain was observed in all three groups.
Dose-finding study: In pregnant rats, the maternal weight gain was decreased at a 40 and a 20 mg/kg of test chemical , respectively.
Food consumption:
Teratology study: Substantial decrease in food consumption was observed in all three groups.
Dose-finding study: In pregnant rats, the food consumption was decreased at a 40 and a 20 mg/kg of test chemical , respectively.
Organ weight: Thymus weight was decreased even at the lowest dose of 3.3 mg/kg whereas treatment with 10 and 30 mg/kg of test chemical resulted in increased thyroid weight.
Reproductive performance:
No effects on reproduction of treated female rats were observed

Dose descriptor:

NOAEL

Effect level:

30 < mg/kg bw/day

Based on:

test mat.

Sex:

female

Basis for effect level:

mortality

body weight and weight gain

food consumption and compound intake

reproductive performance

Remarks on result:

other: No effects on reproductive performance

Critical effects observed:

not specified

System:

other: not specified

Organ:

not specified

Clinical signs:

not specified

Dermal irritation (if dermal study):

not specified

Mortality / viability:

no mortality observed

Description (incidence and severity):

Live fetuses was observed.

Body weight and weight changes:

effects observed, treatment-related

Food consumption and compound intake (if feeding study):

not specified

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Sexual maturation:

not specified

Organ weight findings including organ / body weight ratios:

not specified

Gross pathological findings:

effects observed, treatment-related

Histopathological findings:

not specified

Other effects:

not specified

Behaviour (functional findings):

not specified

Developmental immunotoxicity:

not specified

Body weight:
Fetal body weights significantly decreased only in the litters of dams dosed with 10 mg/kg or higher dose
Gross pathology:
Visceral variations consisting of unilateral or bilateral kinked ureter and / or dilated renal pelvis were noted in 20.5% of fetuses at 10 mg/kg and in 47.6% of the fetuses at 30 mg/kg.
Skeletal variations, unilateral or bilateral rudimentary lumbar ribs, were observed in 22.2% of the fetuses at 30 mg/kg.
The degree of ossification was significantly reduced in the litters of dams treated with ≥ 10 mg/kg of test chemical
Dose-finding study
All fetuses from dams treated with daily doses upto 40 mg/kg body weight, all parameters with respect to fetuses were unaffected.
Only rudimentary lumbar ribs were observed when the treatment period with 60 mg/kg was shortened to Gestation days 7-10, while kinked ureter and dialated renal pelvis were observed only following treatment with 60 mg/kg on days 15-17. Finally , dilated lateral ventricles and cleft palate were observed only in the litters f dams treated with 60 mg/kg on Days 11-14; these anomalies were not observed at lower doses of the chemical.

Dose descriptor:

NOAEL

Generation:

F1

Effect level:

30 mg/kg bw/day

Based on:

test mat.

Sex:

female

Basis for effect level:

viability

mortality

body weight and weight gain

gross pathology

other: No adverse effects observed on

Remarks on result:

other: Fetal body weights significantly decreased only in the litters of dams dosed with 10 mg/kg or higher dose

Critical effects observed:

not specified

System:

other: not specified

Organ:

not specified

Reproductive effects observed:

not specified

Treatment related:

not specified

Conclusions:

NOAEL was considered to be 30 mg/kg bw when Wistar female rat were treated with test chemical orally by gavage from day 7 to 17.

Executive summary:

In a reproductive toxicity study, Wistar female rat were treated with test chemical in the concentration of 0,2.5,5,10,20,40 and 60 mg/kg bw for dose finding study and 0.3.3,10,30 mg/kg bw for teratogenicity study orally by gavage in olive oil from day 7 to 17. Four of five rats treated with 60 mg/kg of test chemical and one of six rats treated with 40 mg/kg died in Dose-finding study and all dams survived in main study. The maternal weight gain was decreased at a 40 and a 20 mg/kg of test chemical respectively in dose-finding study Substantial decrease in body weight gain was observed in all three groups in Teratology study. Food consumption was decreased at a 40 and a 20 mg/kg of test chemical , respectively in dose-finding study and Substantial decrease in food consumption was observed in all three groups in teratology study. Thymus weight was decreased even at the lowest dose of 3.3 mg/kg whereas treatment with 10 and 30 mg/kg of test chemical resulted in increased thyroid weight. No effete on reproduction of treated female rats were observed as compared to control. In addition,All fetuses from dams treated with daily doses upto 40 mg/kg body weight, all parameters with respect to fetuses were unaffected in Dose-finding study. Only rudimentary lumbar ribs were observed when the treatment period with 60 mg/kg was shortened to Gestation days 7-10, while kinked ureter and dialated renal pelvis were observed only following treatment with 60 mg/kg on days 15-17. Finally, dilated lateral ventricles and cleft palate were observed only in the litters f dams treated with 60 mg/kg on Days 11-14; these anomalies were not observed at lower doses of the chemical. Significantly decreased only in the litters of dams dosed with 10 mg/kg or higher of test chemical . Visceral variations consisting of unilateral or bilateral kinked ureter and / or dilated renal pelvis were noted in 20.5% of fetuses at 10 mg/kg and in 47.6% of the fetuses at 30 mg/kg. Skeletal variations, unilateral or bilateral rudimentary lumbar ribs, were observed in 22.2% of the fetuses at 30 mg/kg were observed. The degree of ossification was significantly reduced in the litters of dams treated with ≥ 10 mg/kg of test chemical in main study. Therefore, NOAEL was considered to be 30 mg/kg bw when Wistar female rat were treated with test chemical orally by gavage from day 7 to 17.

 

,

Effect on fertility: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

30 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

Data is Klimicsh 2 and from authoritative database

Effect on fertility: via dermal route

Endpoint conclusion:

no study available

Additional information

Reproductive toxicity study

Data available from different studies were reviewed to determine the reproductive toxicity of test chemical.The studies are as mentioned below:

Study 1

In a reproductive toxicity study, Wistar female rat were treated with test chemical in the concentration of 0,2.5,5,10,20,40 and 60 mg/kg bw for dose finding study and 0.3.3,10,30 mg/kg bw for teratogenicity study orally by gavage in olive oil from day 7 to 17. Four of five rats treated with 60 mg/kg of test chemical and one of six rats treated with 40 mg/kg died in Dose-finding study and all dams survived in main study. The maternal weight gain was decreased at a 40 and a 20 mg/kg of test chemical respectively in dose-finding study Substantial decrease in body weight gain was observed in all three groups in Teratology study. Food consumption was decreased at a 40 and a 20 mg/kg of test chemical , respectively in dose-finding study and Substantial decrease in food consumption was observed in all three groups in teratology study. Thymus weight was decreased even at the lowest dose of 3.3 mg/kg whereas treatment with 10 and 30 mg/kg of test chemical resulted in increased thyroid weight. No effete on reproduction of treated female rats were observed as compared to control. In addition,All fetuses from dams treated with daily doses upto 40 mg/kg body weight, all parameters with respect to fetuses were unaffected in Dose-finding study. Only rudimentary lumbar ribs were observed when the treatment period with 60 mg/kg was shortened to Gestation days 7-10, while kinked ureter and dialated renal pelvis were observed only following treatment with 60 mg/kg on days 15-17. Finally, dilated lateral ventricles and cleft palate were observed only in the litters f dams treated with 60 mg/kg on Days 11-14; these anomalies were not observed at lower doses of the chemical. Significantly decreased only in the litters of dams dosed with 10 mg/kg or higher of test chemical . Visceral variations consisting of unilateral or bilateral kinked ureter and / or dilated renal pelvis were noted in 20.5% of fetuses at 10 mg/kg and in 47.6% of the fetuses at 30 mg/kg. Skeletal variations, unilateral or bilateral rudimentary lumbar ribs, were observed in 22.2% of the fetuses at 30 mg/kg were observed. The degree of ossification was significantly reduced in the litters of dams treated with ≥ 10 mg/kg of test chemical in main study. Therefore, NOAEL was considered to be 30 mg/kg bw when Wistar female rat were treated with test chemical orally by gavage from day 7 to 17.

Study 2

The sperm morphology and vaginal cytology examinations (SMVCEs) study, Fischer 344 male rats were treated with test chemical in the concentration of  0, 1.0, 3.0 and 10 mg/m³by inhalation. No effects on body weight were observed in treated male rat. In addition, Male rats exhibited no change in testicular weight or epididymal weight and no significantly effect on sperm mortality. Therefore, NOAEL was considered to be 10 mg/m³when Fischer 344 male rats were treated with test chemical by inhalation for 13 weeks.

Effects on developmental toxicity

Description of key information

Developmental toxicity study

Based on the various studies available for the test chemical were reviewed to determine the developmental toxicity, NOAELfor test chemical was considered to be 30 mg /kg bw/day .When rats were treated with test chemical orally. Thus, comparing this value with the criteria of CLP regulation test chemical is not likely to classify as reproductive and developmental toxicant.

Link to relevant study records

Reference

Endpoint:

developmental toxicity

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

Data from peer reviewed journal

Qualifier:

equivalent or similar to guideline

Guideline:

other: As mentioned below

Principles of method if other than guideline:

The adverse effects of test chemical on pregnant Wistar rats and their fetuses were examined.

GLP compliance:

not specified

Limit test:

no

Species:

rat

Strain:

Wistar

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: CLEA Japan Inc. (Tokyo, Japan)
- Age at study initiation: Four-week-old
- Housing: Housed individually in stainless steel cages
- Diet (e.g. ad libitum): Feed (NMF, Oriental Yeast Co., Ltd., Tokyo, Japan) ; ad libitum
- Water (e.g. ad libitum): Tap water; ad libitum

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 23 ± 2°C
- Humidity (%):60 ± 10%
- Photoperiod (hrs dark / hrs light): Dark period from 7:00 PM to 7:00 AM

Route of administration:

oral: gavage

Vehicle:

olive oil

Analytical verification of doses or concentrations:

not specified

Details on mating procedure:

- Impregnation procedure: Cohoused
- If cohoused:
- M/F ratio per cage: females were individually paired overnight with a male of similar age.
- Length of cohabitation: overnight
- Further matings after two unsuccessful attempts: no
- Verification of same strain and source of both sexes: [yes / no (explain)]: no
- Proof of pregnancy: [vaginal plug / sperm in vaginal smear] referred to as [day 0 / day 1] of pregnancy: The day upon which sperm was found in vaginal smears was designated as Day 0 of gestation.

Duration of treatment / exposure:

7-17 days

Frequency of treatment:

Daily

Duration of test:

20 days of gestation

Dose / conc.:

0 mg/kg bw/day

Remarks:

Control group (Dose-finding study)

Dose / conc.:

2.5 mg/kg bw/day

Remarks:

Dose-finding study

Dose / conc.:

5 mg/kg bw/day

Remarks:

Dose-finding study

Dose / conc.:

10 mg/kg bw/day

Remarks:

Dose-finding study

Dose / conc.:

20 mg/kg bw/day

Remarks:

Dose-finding study

Dose / conc.:

40 mg/kg bw/day

Remarks:

Dose-finding study

Dose / conc.:

60 mg/kg bw/day

Remarks:

Dose-finding study

Dose / conc.:

0 mg/kg bw/day

Remarks:

Control group (Teratology study)

Dose / conc.:

3.3 mg/kg bw/day

Remarks:

Teratology study

Dose / conc.:

10 mg/kg bw/day

Remarks:

Teratology study

Dose / conc.:

30 mg/kg bw/day

Remarks:

Teratology study

No. of animals per sex per dose:

Dose-finding study:
Mated (pregnant) rats were assigned to seven groups of five or six animals each.

Teratology study:
Mated (pregnant) rats were divided into four groups of 20 rats each.

Control animals:

yes

Details on study design:

Dose-finding study:
Mated rats were assigned to seven groups of five or six animals each. They were treated by gavage with 2-MBI in oIive oil at 0, 2.5, 5, 10, 20, 40, and 60 mg/kg/day in a volume of 5 ml/kg from Days 7 through 17 of gestation. The animals were weighed and food consumpiion was measured each day; general condition and behavior were also observed. On Day 20 of gestation, the animaIs were killed under diet hylether anesthesia, laparotomy was performed, and the maternal thymus and the gravid uterus were weighed. The position and number of live and dead fetuses, including resorbed fetuses, and the number of corpora lutea were recorded. Live fetuses were weighed, sexed, and gross deformities noted. Only one dam treated with 60 mg/kg of 2-MBI survived; viscera ot the fetuses were examined.

Teratology study:
Dose levels of 0, 3.3, 10, and 30 mg/kg/day in a volume of 5 ml/kg were selected based upon the results of the dose-finding study.The dose-finding study revealed that 60 mg/kg was toxic to both fetuses and dams when given throughout the period of organogenesis (Days 7-17 of gestation).Therefore, when mated (pregnant) rats
were dosed with 60 mg/kg of 2-MBI, it was given upon 3 or 4 consecutive days at different periods during organogenesis (Days 7— 10, 11 —14, and I 5—17 of gestation). The other procedures were the same as described here.

Maternal examinations:

BODY WEIGHT: Yes

FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study): Yes

OTHER:
GENERAL CONDITION AND BEHAVIOUR: Yes

ORGAN WEIGHT:
Maternal thymus, thyroid gland, and gravid uterus were weighed.

Ovaries and uterine content:

The ovaries and uterine content was examined after termination: Yes
Examinations included:
- Gravid uterus weight: Yes
- Number of corpora lutea: Yes
- Number of early resorptions: Yes

Fetal examinations:

- Fetuses were examined grossly.
- Gross necropsy consisted of Visceral and Skeletal observation.
- The position and number of live and dead fetuses, including resorbed fetuses were recorded. Live fetuses were weighed, sexed, and gross deformities noted.

Statistics:

Data from the dose-finding and teratology studies in which animals were treated with ≤30 mg/kg of test chemical were analyzed by Dunnett’s multiple comparison method in a parametric or nonpararnetric manner.

Indices:

not specified

Historical control data:

not specified

Clinical signs:

not specified

Dermal irritation (if dermal study):

not specified

Mortality:

mortality observed, treatment-related

Description (incidence):

Teratology study
All dams treated with 0, 3.3, 10 and 30 mg/kg of test chemical survived.

Dose-finding sludy
Four of five rats treated with 60 mg/kg of test chemical and one of 6 rats treated with 40 mg/kg died.

Body weight and weight changes:

effects observed, treatment-related

Description (incidence and severity):

Teratology study
Substantial decrease in body weight gain was observed in all three groups.

Dose-finding sludy
In pregnant rats, the maternal weight gain was decreased at a 40 and a 20 mg/kg of test chemical espectively.

Food consumption and compound intake (if feeding study):

effects observed, treatment-related

Description (incidence and severity):

Teratology study
Substantial decrease in food consumption was observed in all three groups.

Dose-finding sludy
In pregnant rats, the food consumption was decreased at a 40 and a 20 mg/kg of test chemical , respectively.

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Behaviour (functional findings):

not specified

Immunological findings:

not specified

Organ weight findings including organ / body weight ratios:

effects observed, treatment-related

Description (incidence and severity):

Thymus weight was decreased even at the lowest dose of 3.3 mg/kg whereas treatment with 10 and 30 mg/kg of test chemical resulted in increased thyroid weight.

Gross pathological findings:

no effects observed

Neuropathological findings:

not specified

Histopathological findings: non-neoplastic:

not specified

Histopathological findings: neoplastic:

not specified

Other effects:

not specified

Number of abortions:

not specified

Pre- and post-implantation loss:

not specified

Total litter losses by resorption:

not specified

Early or late resorptions:

not specified

Dead fetuses:

not specified

Changes in pregnancy duration:

not specified

Changes in number of pregnant:

not specified

Other effects:

not specified

Details on maternal toxic effects:

Maternal toxic effects:yes

Details on maternal toxic effects:
Decreased thymus weights, increased thyroid weights, decreased body weight gain, and decreased food consumption in the treated dams were observed.Because of the severe resulting toxicity, 60 mg/kg dose could not be administered throughout the period of organogenesis (Gestetion days 7-17). Instead, the test animals were dosed for shorter periods of time, viz., Gestation Days 7-10 (17 rats), 11-14 (16 pregnant rats), or 15-17(16 pregnant rats). Even under these dosing conditions, test chemical was severely toxic to dams, as evidenced by a substantial decrease in maternal body weight gain and food consumption in all three groups and maternal death (5 out of 16 dams) in the group treated on Days 11-14 of gestation. Vaginal bleeding was observed in 10 and 2 dams in the group treated on Days 11-14 and 15-17 of gestation, respectively.

Dose descriptor:

NOAEL

Effect level:

< 3.3 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

other: Because of significant decrease in maternal thymus weights at this dose.

Abnormalities:

not specified

Localisation:

not specified

Fetal body weight changes:

effects observed, treatment-related

Description (incidence and severity):

Fetal body weights were significantly decreased only in the litters of dams dosed with 10 mg/kg or higher dose of test chemical

Reduction in number of live offspring:

not specified

Changes in sex ratio:

not specified

Changes in litter size and weights:

not specified

Changes in postnatal survival:

not specified

External malformations:

not specified

Skeletal malformations:

effects observed, treatment-related

Description (incidence and severity):

Skeletal variations, unilateral or bilateral rudimentary lumbar ribs, were observed in 22.2% of the fetuses at 30 mg/kg.
The degree of ossification was significantly reduced in the litters of dams treated with ≥ 10 mg/kg of test chemical

Visceral malformations:

effects observed, treatment-related

Description (incidence and severity):

Visceral variations consisting of unilateral or bilateral kinked ureter and / or dilated renal pelvis were noted in 20.5% of fetuses at 10 mg/kg and in 47.6% of the fetuses at 30 mg/kg.

Other effects:

not specified

Details on embryotoxic / teratogenic effects:

Embryotoxic / teratogenic effects:yes

Details on embryotoxic / teratogenic effects:
Decresed fetal body weights and increased the incidence of certain anomalies of the urogenital system and of rudimentary lumbar ribs.

Dose-finding study
All fetuses from dams treated with daily doses upto 40 mg/kg body weight, all parameters with respect to fetuses were unaffected.

Only rudimentary lumbar ribs were observed when the treatment period with 60 mg/kg was shortened to Gestation days 7-10, while kinked ureter and dialated renal pelvis were observed only following treatment with 60 mg/kg on days 15-17. Finally , dilated lateral ventricles and cleft palate were observed only in the
litters of dams treated with 60 mg/kg on Days 11-14; these anomalies were not observed at lower doses of the chemical.

Dose descriptor:

NOAEL

Effect level:

3.3 mg/kg bw/day

Based on:

test mat.

Sex:

female

Basis for effect level:

other: teratogenicity

Remarks on result:

other: No developmental toxic effects were observed

Abnormalities:

not specified

Developmental effects observed:

not specified

Conclusions:

The no observed adverse effect level was considered to be 3.3 mg/kg. When rats were treated with test chemical orally.

Executive summary:

The study was designed to investigate the reproductive toxicity effects of test chemical to pregnant Wistar rats and to their fetuses by oral route. Pregnant rats were treated with test chemical at doses of 0, 3.3, 10, and 30 mg/kg during the period of organogenesis (Gestation Days 7-17). Mated (pregnant) rats were divided into four groups of 20 rats each. Treatment with 10 and 30 mg/kg of test chemical resulted in decreased thymus weights, increased thyroid weights, decreased body weight gain, and decreased food consumption in the treated dams. These dosages also reduced fetal body weights and increased the incidence of certain anomalies of the urogenital system and of rudimentry lumbar ribs. Under the conditions of the present study, The no observed adverse effect level was considered  to be 3.3 mg/kg. When rats were treated with test chemical orally.

Effect on developmental toxicity: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

30 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

Data is Klimicsh 2 and from authoritative database

Effect on developmental toxicity: via inhalation route

Endpoint conclusion:

no study available

Effect on developmental toxicity: via dermal route

Endpoint conclusion:

no study available

Additional information

Developmental toxicity study

Data available from different studies for test chemicals were reviewed to determine the developmental toxicity of test chemical. The studies are as mentioned below:

Study 1

The study was designed to investigate the reproductive toxicity effects of test chemical to pregnant Wistar rats and to their fetuses by oral route. Pregnant rats were treated with test chemical at doses of 0, 3.3, 10, and 30 mg/kg during the period of organogenesis (Gestation Days 7-17). Mated (pregnant) rats were divided into four groups of 20 rats each. Treatment with 10 and 30 mg/kg of test chemical resulted in decreased thymus weights, increased thyroid weights, decreased body weight gain, and decreased food consumption in the treated dams. These dosages also reduced fetal body weights and increased the incidence of certain anomalies of the urogenital system and of rudimentry lumbar ribs. Under the conditions of the present study, The no observed adverse effect level was considered  to be 3.3 mg/kg. When rats were treated with test chemical orally.

Study 2

In order to investigate teratogenic potential of test chemical, the female wistar rats were given a single dosage of 120 mg/kg of the test chemica orally by stomach intubation on day 12 or 13 (because higher dosages killed some pregnant females). Females were killed on day 22 of gestation and individual litter weight, litter size, and number of deciduomas and corpora lutea determined. Approximately two thirds of the fetuses were processed for skeleton examination and the remainder for visceral examination. Thetest chemical did not displayed any teratogenic potential at the maternally tolerated dosages (120 mg/kg). All anomalies in fetuses to test chemical were minor, such as nonfusion of 5th sternebra, wavy ribs, retarded ossification, and 14th rib. Thus, under the conditions of the present study, the no observed adverse effect level (NOAEL) of test chemical for teratogenicity was considered to be 120 mg/kg.

Justification for classification or non-classification

Thus, comparing this value with the criteria of CLP regulation test chemical is not likely to classify as reproductive and developmental toxicant.