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Diss Factsheets
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EC number: - | CAS number: -
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Developmental toxicity / teratogenicity
Administrative data
- Endpoint:
- developmental toxicity
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Oct 2018 - Jul 2019
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 019
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 414 (Prenatal Developmental Toxicity Study)
- Version / remarks:
- 2001
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Limit test:
- no
Test material
Constituent 1
Test animals
- Species:
- rat
- Strain:
- Wistar
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Charles River UK Ltd
- Females (if applicable) nulliparous and non-pregnant: yes
- Age at study initiation: approx. 75 days
- Weight at study initiation: females 225-270 g
- Fasting period before study: no
- Housing: 4 females per cage during acclimatisation, 1 male and 1 female per cage during pairing ,1 female per cage during gestation
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 9 days
DETAILS OF FOOD AND WATER QUALITY: SDS VRF1 certified pelleted diet; potable water from public supply
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20-24°C
- Humidity (%): 40-70%
- Air changes (per hr):
- Photoperiod (hrs dark / hrs light): 12 h / 12 h
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- propylene glycol
- Details on exposure:
- PREPARATION OF DOSING SOLUTIONS:
The required amounts of test material were weighed and approx. 50% of the final volume of vehicle was added and mixed with a magnetic stirrer until homogeneous. Then the final volume was adjusted and stirred until homogeneous.
VEHICLE
- Justification for use and choice of vehicle (if other than water):
- Concentration in vehicle: 20, 60, 200 mg/ml
- Amount of vehicle (if gavage): 5 ml/kg bw
- Lot/batch no. (if required):
- Purity: - Analytical verification of doses or concentrations:
- yes
- Details on analytical verification of doses or concentrations:
- Concentrations of dose formulations were analysed by HPLC/MS. The mean concentrations of WS400123 analysed in test formulations were within 5% of the nominal concentrations.
- Details on mating procedure:
- - Impregnation procedure: cohoused
- M/F ratio per cage: 1 : 1
- Length of cohabitation: until evidence of mating
- Verification of same strain and source of both sexes: yes, a colony of stud males was maintained
- Proof of pregnancy: vaginal plug / sperm in vaginal smear referred to as day 0 of pregnancy
- Duration of treatment / exposure:
- from day 6 till day 19 of gestation
- Frequency of treatment:
- daily
Doses / concentrationsopen allclose all
- Dose / conc.:
- 100 mg/kg bw/day (actual dose received)
- Dose / conc.:
- 300 mg/kg bw/day (actual dose received)
- Dose / conc.:
- 1 000 mg/kg bw/day (actual dose received)
- No. of animals per sex per dose:
- 20 females per dose
- Control animals:
- yes, concurrent vehicle
- Details on study design:
- Dose selection rationale: In an OECD422 study in Sprague Dawley rats, oral administration of WS400123 at dose levels of 100, 300 and 1000 mg/kg/day was well tolerated without adverse effects.
Examinations
- Maternal examinations:
- CAGE SIDE OBSERVATIONS: Yes
- Time schedule: twice daily
- Cage side observations : visual inspection for ill-health or reaction to treatment
DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: days 0, 5, 12, 18, and 20
BODY WEIGHT: Yes
- Time schedule for examinations: days 0, 3, and daily from 6-20
FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study): Yes
POST-MORTEM EXAMINATIONS: Yes
- Sacrifice on gestation day # 20
- Organs examined: full macroscopic examination of tissues
- 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 implantations: Yes
- Number of early resorptions: Yes
- Number of late resorptions: Yes
- Other: number of fetuses (live and dead) - Fetal examinations:
- - External examinations: Yes: all per litter
- Soft tissue examinations: Yes: half per litter
- Skeletal examinations: Yes: half per litter
- Head examinations: Yes : all per litter - Statistics:
- The following sequence of statistical tests was used for body weight, gravid uterus weight, food consumption, corpora lutea, implantations, live young, fetal, placental and litter weight data:
A parametric analysis was performed if Bartlett's test for variance homogeneity (Bartlett 1937) was not significant at the 1% level. For pretreatment data, analysis of variance was used to test for any group differences. Where this was significant (p<0.05) inter group comparisons using t-tests, with the error mean square from the one-way analysis of variance, were made. For all other comparisons t/The F1 approximate test was applied. This test is designed to detect significant departure from monotonicity of means when the main test for the comparison of the means is a parametric monotonic trend test, such as Williams’ test (Williams 1971, 1972). The test statistic compares the mean square, NMS, for the deviations of the observed means from the maximum likelihood means, calculated under a constraint of monotonicity with the usual error mean square, EMS. The null hypothesis is that the true means are monotonically ordered. The test statistic is F1 = NMS/EMS which can be compared with standard tables of the F-distribution with 1 and error degrees of freedom. If the F1 approximate test for monotonicity of dose-response was not significant at the 1% level, Williams' test for a monotonic trend was applied. If the F1 approximate test was significant, suggesting that the dose response was not monotone, Dunnett's test (Dunnett 1955, 1964) was performed instead.
A non-parametric analysis was performed if Bartlett's test was still significant at the 1% level following both logarithmic and square-root transformations. For pretreatment data, Kruskal-Wallis’ test (Kruskal and Wallis 1952, 1953) was used to test for any group differences. Where this was significant (p<0.05) inter group comparisons using Wilcoxon rank sum tests (Wilcoxon 1945) were made. - Indices:
- Prenatal losses were separated into pre- and post-implantation phases. Pre-implantation loss was considered to reflect losses due to non-fertilization of ova and failure to implant. It was calculated from the formula:
Pre-implantation loss (%) = (Number of corpora lutea – Number of implantations) x 100 / Number of corpora lutea
Where the number of implantations exceeded the number of corpora lutea observed, pre implantation loss was assumed to be zero (i.e. no pre-implantation loss was considered to have occurred).
Post-implantation loss was calculated from the formula:
Post-implantation loss (%) = (Number of implantations – Number of live fetuses) x 100 / Number of implantations
All group values and SD (as appropriate) were calculated from the individual litter values - Historical control data:
- Historical control data from 10 studies performed from April 2018 to February 2019 with the same rat strain are provided in the report.
Results and discussion
Results: maternal animals
General toxicity (maternal animals)
- Clinical signs:
- no effects observed
- Mortality:
- mortality observed, non-treatment-related
- Description (incidence):
- one animal of the control group died due to mal-dosing during gavage administration.
- Body weight and weight changes:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Figure Body weight of dams
- Food consumption and compound intake (if feeding study):
- no effects observed
- Food efficiency:
- not specified
- Water consumption and compound intake (if drinking water study):
- not specified
- 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
- Neuropathological findings:
- not examined
- Histopathological findings: non-neoplastic:
- not examined
- Histopathological findings: neoplastic:
- not examined
- Other effects:
- no effects observed
Maternal developmental toxicity
- Number of abortions:
- no effects observed
- Pre- and post-implantation loss:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Litter data
- Total litter losses by resorption:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Litter data
- Early or late resorptions:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Litter data
- Dead fetuses:
- no effects observed
- Changes in pregnancy duration:
- no effects observed
- Changes in number of pregnant:
- no effects observed
- Other effects:
- no effects observed
Effect levels (maternal animals)
- Key result
- Dose descriptor:
- NOAEL
- Effect level:
- >= 1 000 mg/kg bw/day (actual dose received)
- Based on:
- test mat.
- Basis for effect level:
- other:
- 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):
- see "overall remarks, attachments" : Table Litter and fetal weights
- Reduction in number of live offspring:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Litter data
- Changes in sex ratio:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Litter data
- Changes in litter size and weights:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Litter and fetal weights
- Changes in postnatal survival:
- not examined
- External malformations:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Fetal major abnormality findings
- Skeletal malformations:
- no effects observed
- Description (incidence and severity):
- see Table Fetal minor skeletal abnormality findings
- Visceral malformations:
- no effects observed
- Description (incidence and severity):
- see "overall remarks, attachments" : Table Fetal minor visceral abnormality findings
- Other effects:
- no effects observed
Effect levels (fetuses)
- Key result
- Dose descriptor:
- NOAEL
- Effect level:
- >= 1 000 mg/kg bw/day (actual dose received)
- Based on:
- test mat.
- Sex:
- male/female
- Basis for effect level:
- other:
- Remarks on result:
- not determinable due to absence of adverse toxic effects
Fetal abnormalities
- Key result
- Abnormalities:
- no effects observed
Overall developmental toxicity
- Key result
- Developmental effects observed:
- no
Applicant's summary and conclusion
- Executive summary:
Treatment of pregnant rats with WS400123 was well tolerated and there were no test-item related deaths. Clinical condition, body weight performance, gravid uterine weight, adjusted body weight gain and food consumption were not adversely affected by WS400123 at any dose level investigated. There were no macroscopic abnormalities detected at scheduled termination.
There was no effect of maternal treatment with WS400123 on the mean numbers of corpora lutea, implantations, resorptions, live young, pre- and post- implantation losses, sex ratio or on placental, litter and fetal weights at any dose level investigated.
Evaluation of the fetuses did not reveal any adverse major, minor, skeletal or visceral abnormalities which were considered to be related to maternal treatment with WS400123.
Based on the results of this embryo-fetal toxicity study, it was concluded that the dose level of 1000 mg/kg/day represented the No Observed Adverse Effect Level (NOAEL) for maternal toxicity and for embryo-fetal survival, growth and development.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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