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Toxicological information

Developmental toxicity / teratogenicity

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Administrative data

Endpoint:
developmental toxicity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23rd October 2015 to 11th November 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 414 (Prenatal Developmental Toxicity Study)
Deviations:
yes
Remarks:
The Study Plan target range for relative humidity (RH) was 50 ± 20%. This target range was exceeded for one short period during the study, with a maximum humidity of 74% RH being reached.
Qualifier:
according to
Guideline:
EU Method B.31 (Prenatal Developmental Toxicity Study)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Test animals

Species:
rat
Strain:
Sprague-Dawley
Remarks:
Crl:CD® (SD) IGS BR
Details on test animals and environmental conditions:
TEST ANIMALS - Source: Charles River (UK) Limited - Weight at study initiation: 179g to 301g - Housing: Solid-floor polypropylene cages with stainless steel mesh lids furnished with softwood flakes - Diet: ad libitum - Water: ad libitum ENVIRONMENTAL CONDITIONS - Temperature (°C): 22 ± 3 ºC - Humidity (%): 50 ± 20% - Air changes (per hr): at least fifteen air changes per hour - Photoperiod (hrs dark / hrs light): twelve hours continuous light and twelve hours darkness IN-LIFE DATES: From: To: 23 October 2015 (first day of treatment) and 11 November 2015 (final day of necropsy)

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
polyethylene glycol
Details on exposure:
Polyethylene glycol (PEG 400) was successfully used as the vehicle in the preliminary study, it was also used for this main pre-natal study, utilizing a dosage volume of 4 ml/kg body weight.
Duration of treatment / exposure:
Day 3 (pre-implantation) to Day 19 of gestation, inclusive.
Frequency of treatment:
Daily.
Doses / concentrationsopen allclose all
Dose / conc.:
0 mg/kg bw/day (nominal)
Remarks:
Control - animals were treated in an identical manner with the vehicle alone
Dose / conc.:
100 mg/kg bw/day (nominal)
Dose / conc.:
300 mg/kg bw/day (nominal)
Dose / conc.:
1 000 mg/kg bw/day (nominal)
No. of animals per sex per dose:
24 animals per dose.
Control animals:
yes, concurrent vehicle

Examinations

Maternal examinations:
DETAILED CLINICAL OBSERVATIONS: Yes - Time schedule: Following arrival, all animals were examined for overt signs of toxicity, ill-health or behavioral changes once daily during the gestation period. Additionally, during the dosing period, observations were performed immediately before and soon after dosing and one hour post dosing. BODY WEIGHT: Yes - Time schedule for examinations: Individual body weights were recorded on Day 3 (before the start of treatment) and on Days 5, 6, 7, 8, 11, 14 and 17 of gestation. Body weights were also recorded for animals at terminal kill (Day 20). POST-MORTEM EXAMINATIONS: Yes - Sacrifice on gestation day # 20 - Organs examined: The ovaries and uteri of pregnant females were removed, examined and the following data recorded:i) Number of corpora luteaii) Number, position and type of intrauterine implantationiii) Fetal sexiv) External fetal appearancev) Fetal weightvi) Placental weightvii) Gravid uterus weight
Ovaries and uterine content:
i) Number of corpora luteaii) Number, position and type of intrauterine implantationiii) Fetal sexiv) External fetal appearancev) Fetal weightvi) Placental weightvii) Gravid uterus weight
Fetal examinations:
Skeletal alterations and soft tissue alterations, visceral anomalies and skeletal development and anomalies.
Statistics:
Body weight and body weight change (including adjustment for the contribution of the gravid uterus), food consumption, gravid uterus weight, litter data and fetal, litter and placental weights and external, visceral and skeletal observations were statitically analysed.Data were first analysed using Shapiro Wilk normality test and Bartlett’s test for homogeneity of variance. Where there was no significance, parametric methodology was applied using one way analysis of variance and, if significant, Dunnett’s multiple comparison test. Where statistical significance was observed, non parametric methodology was applied using Kruskal-Wallis nonparametric analysis of variance; and, if significant, pairwise analysis of control values against treated values using the Mann-Whitney ‘U’ test. Due to the non-normal distribution of the data, externa , visceral and skeletal observations were generally analyzed using non-parametric methodology.Probability values (p) are presented as follows:p<0.01 **p<0.05 *p≥0.05 (not significant)
Indices:
Percentage pre- and post-implantation loss and sex ratio (% male fetuses).

Results and discussion

Results: maternal animals

General toxicity (maternal animals)

Clinical signs:
no effects observed
Description (incidence and severity):
The occasional clinical signs observed did not indicate any effect of treatment at 100, 300 or 1000 mg/kg bw/day.
Dermal irritation (if dermal study):
not examined
Mortality:
no mortality observed
Description (incidence):
There were no unscheduled deaths on the study.
Body weight and weight changes:
no effects observed
Description (incidence and severity):
Body weight and body weight gain, including adjustment for the contribution of the gravid uterus, were unaffected by treatment at 100, 300 or 1000 mg/kg bw/day.
Food consumption and compound intake (if feeding study):
no effects observed
Description (incidence and severity):
There was no effect of treatment on food consumption at 100, 300 or 1000 mg/kg bw/day.
Food efficiency:
no effects observed
Description (incidence and severity):
There was no effect of treatment on food conversion efficiency at 100, 300 or 1000 mg/kg bw/day.
Water consumption and compound intake (if drinking water study):
no effects observed
Description (incidence and severity):
Daily visual inspection of water bottles did not reveal any overt intergroup differences.
Ophthalmological findings:
not examined
Haematological findings:
not examined
Clinical biochemistry findings:
not examined
Urinalysis findings:
not examined
Behaviour (functional findings):
not examined
Immunological findings:
not examined
Organ weight findings including organ / body weight ratios:
not examined
Gross pathological findings:
no effects observed
Description (incidence and severity):
Other than generalized fur loss for one female receiving 300 mg/kg bw/day, no macroscopic abnormalities were apparent for females at Day 20 of gestation.
Neuropathological findings:
not examined
Histopathological findings: non-neoplastic:
not examined
Histopathological findings: neoplastic:
not examined
Other effects:
not specified

Maternal developmental toxicity

Number of abortions:
no effects observed
Description (incidence and severity):
There were no abortions.
Pre- and post-implantation loss:
no effects observed
Total litter losses by resorption:
no effects observed
Early or late resorptions:
no effects observed
Dead fetuses:
no effects observed
Changes in pregnancy duration:
not specified
Description (incidence and severity):
Migrated Data from removed field(s)
Field "Effects on pregnancy duration" (Path: ENDPOINT_STUDY_RECORD.DevelopmentalToxicityTeratogenicity.ResultsAndDiscussion.ResultsMaternalAnimals.MaternalDevelopmentalToxicity.EffectsOnPregnancyDuration): no effects observed
Changes in number of pregnant:
no effects observed
Description (incidence and severity):
One animal in each of control group and top dose group was found to be non- pregnant. CategoryNumber of Females at Dose Levels (mg/kg bw/day)0 (Control)1003001000Initial group size24242424Non-pregnant1001With live young on day 20 of gestation23242423

Effect levels (maternal animals)

Key result
Dose descriptor:
NOEL
Effect level:
1 000 mg/kg bw/day (actual dose received)
Based on:
test mat.
Basis for effect level:
clinical signs
mortality
body weight and weight gain
food consumption and compound intake
number of abortions
pre and post implantation loss
total litter losses by resorption
dead fetuses
necropsy findings
Remarks on result:
not determinable due to absence of adverse toxic effects

Maternal abnormalities

Key result
Abnormalities:
no effects observed

Results (fetuses)

Fetal body weight changes:
no effects observed
Description (incidence and severity):
Migrated Data from removed field(s)
Field "Fetal/pup body weight changes" (Path: ENDPOINT_STUDY_RECORD.DevelopmentalToxicityTeratogenicity.ResultsAndDiscussion.ResultsFetuses.FetalPupBodyWeightChanges): no effects observed
Reduction in number of live offspring:
no effects observed
Changes in sex ratio:
no effects observed
Changes in litter size and weights:
no effects observed
External malformations:
no effects observed
Skeletal malformations:
effects observed, non-treatment-related
Description (incidence and severity):
At all dosages the incidence of fetuses with costal cartilage not fused to sternebra was higher than control with statistical significance being reached at 100 and 1000 mg/kg bw/day. However there was no dosage-relationship and this isolated finding was considered to be incidental and unrelated to maternal treatment.
Visceral malformations:
effects observed, treatment-related
Description (incidence and severity):
At 1000 mg/kg bw/day the overall incidence of fetuses showing visceral findings was slightly higher than control but there was no statistically significant increase in any fetal parameter that indicated any clear effect of maternal treatment. This increased incidence was considered most likely to be incidental and unrelated to maternal treatment.

Effect levels (fetuses)

Key result
Dose descriptor:
NOEL
Effect level:
1 000 mg/kg bw/day (actual dose received)
Based on:
test mat.
Sex:
male/female
Basis for effect level:
changes in sex ratio
fetal/pup body weight changes
external malformations
visceral malformations
Remarks on result:
not determinable due to absence of adverse toxic effects

Fetal abnormalities

Abnormalities:
not specified

Overall developmental toxicity

Developmental effects observed:
not specified

Applicant's summary and conclusion

Conclusions:
The administration off the test material to pregnant rats did not result in any adverse effects on the dams or on the survival, growth and development of the offspring. Therefore the NOEL is considered to be 1000 mg/kg bw/day (highest dose tested).
Executive summary:

In a developmental study the substance was administered to Sprage-Dawley rats 24/sex/dose by gavage at dose levels of 0, 100, 300 or 1000 mg/kg bw/day. Clinical symptoms, body weight and food consumption were recorded, and the uterus of females (number of corpora lutea, number, position and type of intrauterine implantation, placental weight, gravid uterus weight) and fetuses (total number, sex, weight and external, visceral-one-half and skeletal-one-half defects) were examined.There were no compound related effects in the dams or the offspring for the parameters monitored. The NOEL is 1000 mg/kg bw/day (the highest dose employed).