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Diss Factsheets

Administrative data

Endpoint:
screening for reproductive / developmental toxicity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19th June 2018 to 05th September 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: EPA OPPTS 870.3650 Combined Repeated Dose Toxicity Study with the Reproduction/ Developmental Toxicity Screening Test
Version / remarks:
July 2000
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: Commission Regulation (EC)
Version / remarks:
No. 440/2008, L 142, Annex Part B, May, 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Limit test:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
1,3,5-tris[3-(trimethoxysilyl)propyl]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione
EC Number:
247-465-8
EC Name:
1,3,5-tris[3-(trimethoxysilyl)propyl]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione
Cas Number:
26115-70-8
Molecular formula:
C21H45N3O12Si3
IUPAC Name:
tris[3-(trimethoxysilyl)propyl]-1,3,5-triazinane-2,4,6-trione
Test material form:
liquid
Specific details on test material used for the study:
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature
- Solubility and stability of the test substance in the solvent/vehicle: homogenous and stability was demonstrated for 10 days at room temperature
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: not applicable

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: The test item formulations were prepared with dried corn oil and thereafter administered within the stability time frame of 10 days. The test item was weighe d into a tared plastic vial on a suitable precision balance and the vehicle was added to give the a ppropriate final concentration of the test item further vortexing it for 2-3 minutes and/or stirring until v isual homogeneity was achieved.
- Preliminary purification step (if any): n/a
- Final dilution of a dissolved solid, stock liquid or gel: n/a
- Final preparation of a solid: n/a

Test animals

Species:
rat
Strain:
Wistar
Details on species / strain selection:
Crl: WI(Han)
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Charles River, Germany
- Females nulliparous and non-pregnant: yes
- Age at study initiation: appr. 12-13 weeks old
- Weight at study initiation: males: 344 - 398 g (mean: 365.31 g, ± 20 % = 292.25 – 438.37 g) females: 204 - 243 g (mean: 225.58 g, ± 20 % = 180.46 – 270.69 g)
- Fasting period before study: not specified
- Housing: Animals were housed in groups of 5 animals / sex / cage in type IV polysulphone cages or in double decker IVC cages during the premating period for both males and females and during post-mating period for males depending on the mating status. During mating period males and femal es were housed together in ratio 1:1 (male to female). After the confirmation of mating, females were kept individually during gestation/lactation period in type III H, polysulphone cages and males were returned to their original cage. In each cage Altromin saw fibre was used as bedding
- Diet: ad libitum: free access to Altromin 1324 maintenance diet for rats and mice
- Water: Free access to tap water, sulphur acidified to a pH of approximately 2.8 (drinking water, municipal residue control, microbiological controls at regular intervals)
- Acclimation period: adequate acclimatisation period (at least 5 days) under laboratory conditions

DETAILS OF FOOD AND WATER QUALITY: Food and water quality are certified by the test facility every two years.
ENVIRONMENTAL CONDITIONS
- Temperature (°C): : 22 +/- 3 °C
- Humidity (%): 55 +/- 10%
- Air changes (per hr): 10 times
- Photoperiod (hrs dark / hrs light): 12 hours light, 12 hours dark

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
corn oil
Details on exposure:
PREPARATION OF DOSING SOLUTIONS: The test item formulations were prepared with dried corn oil and thereafter administered within the stability time frame of 10 days. The test item was weighed into a tared plastic vial on a suitable precision balance and the vehicle was added to give the appropriate final concentration of the test item further vortexing it for 2-3 minutes and/or stirring until visual homogeneity was achieved.

VEHICLE
- Justification for use and choice of vehicle (if other than water): The test item formulation was prepared with dried corn oil. The vehicle was selected as suggested by the sponsor based on the test item’s characteristics and testing guideline.
- Concentration in vehicle: 25, 75 and 250 mg/mL
- Amount of vehicle (if gavage): not specified
- Lot/batch no. (if required): MKCC9871, MKCF8882
- Purity: not specified
Details on mating procedure:
- M/F ratio per cage: ratio of 1:1 (male to female)
- Length of cohabitation: 14 days of mating
- Proof of pregnancy: vaginal plug / sperm in vaginal smear referred to as day 0 of pregnancy
- Due to unsuccessful mating pairing replacement of first male by another male with proven fertility.
- Further matings after two unsuccessful attempts: not specified
- After successful mating each pregnant female was caged (how): After the confirmation of mating, females were kept individually during gestation/lactation period
- Any other deviations from standard protocol: none
Analytical verification of doses or concentrations:
yes
Details on analytical verification of doses or concentrations:
For verification of dose concentrations samples were taken of formulation samples in study week 1 (p re-mating period), 3 (first week of mating), 5 (gestation) and in the last week of the study (gestation / lactation) from all groups (16 samples).
Duration of treatment / exposure:
The test item was administered for a treatment period of up to 63 days, i.e. during 14 days of pre-mating and maximum 14 days of mating in both males and females, during the gestation period and up to post-natal day 12 in females. The males of the recovery groups were treated for 28 days and were subjected to necropsy 15 days after the last administration (end of recovery period). The females of the recovery groups were treated up to the first scheduled necropsy of dam and were subjected to necropsy 15 days thereafter (end of recovery period).
Frequency of treatment:
A single dose given daily.
Details on study schedule:
- P0 parental animals not mated during the 14-day pre-mating period.
- Selection of parents from F1 generation when pups were [...] days of age. Not applicable
- Age at mating of the mated animals in the study: [...] weeks: 14-15 weeks of age
Doses / concentrationsopen allclose all
Dose / conc.:
100 mg/kg bw/day (nominal)
Remarks:
low dose (LD)
Dose / conc.:
300 mg/kg bw/day (nominal)
Remarks:
Mid dose (MD)
Dose / conc.:
1 000 mg/kg bw/day (nominal)
Remarks:
High dose (HD)
No. of animals per sex per dose:
10 males and 10 females per test group plus additional 10 recovery group males and 10 recovery group females
Control animals:
yes, concurrent vehicle
Details on study design:
- Dose selection rationale: The selected dose levels were based on findings of a dose range-finding study conducted with the registered substance and in consultation with the sponsor.
- Rationale for animal assignment (if not random): random
- Fasting period before blood sampling for clinical biochemistry: no
- Other:
Positive control:
Not included.

Examinations

Parental animals: Observations and examinations:
CAGE SIDE OBSERVATIONS: Yes
- Time schedule: At least once per day for general health condition and twice daily for mortality and morbidity
- Cage side observations checked included: mortality, morbidity and general health condition of the animals

DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: Once before the first exposure, and at least once a week thereafter, detailed clinical observations were made in all animals of the main groups and the recovery groups outside the home cage in a standard arena. Clinical observations included spontaneous activity, lethargy, rectum bent position, convulsions, tremors, apnoea, asphyxia, vocalisation, diarrhoea, changes in the skin and fur, eyes and mucous membranes (salivation, discharge), piloerection and pupil size. Changes in gait, posture, response to handling as well as the presence of clonic or tonic movements, stereotypes, difficult or prolonged parturition or bizarre behaviour were recorded.

BODY WEIGHT: Yes
- Time schedule for examinations: The animals were weighed once before the assignment to the experimental groups, on the first day of dosing and weekly thereafter as well as at the end of the study. During pregnancy, females were weighed on gestation days (GD) 0, 7, 14 and 20 and within 24 hours of parturition (day 0 post-partum), on PND 4, PND 9 and PND 13 along with pups. All animals were weighed directly before termination. Any animal prematurely sacrificed was weighed pr ior to the sacrifice.

FOOD CONSUMPTION: Yes
- Time schedule for examinations: Food consumption was measured on the corresponding days of the body weight measurements after the beginning of the dose administration. Food consumption was not measured during the mating period in males and females and the post-mating period in males.
Oestrous cyclicity (parental animals):
All 70 females were screened for regular estrous cycles for 14 days before the treatment initiation and only 40 females (10 females/ group) showing regular estrous cycles were selected in the main study and 10 females in recovery groups.
Sperm parameters (parental animals):
Parameters examined in all male parental animals: testis weight, epididymis weight, checked on completeness of cell populations, completeness of stages and degenerative changes.
Litter observations:
The duration of gestation was recorded and is calculated from day 0 of the pregnancy. Each litter was examined as soon as possible after the delivery of the dam to establish the number and sex of pups, stillbirths, live births, runts and the presence of gross abnormalities. Live pups were counted and sexed and litters weighed within 24 hours of littering (PND 0) and on PND 4 and PND 13.

STANDARDISATION OF LITTERS
- Performed on day 4 postpartum: no

PARAMETERS EXAMINED
The following parameters were examined in F1 offspring: number and sex of pups, stillbirths, live births, postnatal mortality, presence of gross anomalies, weight gain, physical or behavioural abnormalities, anogenital distance (AGD), pup weight on the day of AGD, presence of nipples/areolae in male pups

GROSS EXAMINATION OF DEAD PUPS: yes, for external and internal abnormalities

ASSESSMENT OF DEVELOPMENTAL NEUROTOXICITY: No

ASSESSMENT OF DEVELOPMENTAL IMMUNOTOXICITY: No
Postmortem examinations (parental animals):
SACRIFICE
- Male animals: All surviving animals were sacrified on study day 28
- Maternal animals: All surviving animals were sacrified on post-natal day 13

GROSS NECROPSY
- Gross necropsy consisted of external and internal examinations including the cervical, thoracic, and abdominal viscera.

HISTOPATHOLOGY / ORGAN WEIGHTS
The tissues indicated in Table No 1 were prepared for microscopic examination and weighed, respectively.
Postmortem examinations (offspring):
SACRIFICE
- The F1 offspring were sacrificed at 13 days of age.
- These animals were subjected to postmortem examinations macroscopic and/or microscopic examination.

CLINICAL CHEMISTRY: Blood samples were collected from from 2 female (if possible) pups/litter on postnatal day 4 and from 2 pups/litter (1 male and 1 female, if possible) at termination on day 13 . All blood samples were stored under appropriate conditions. Blood samples from the day 13 pups were assessed for serum levels for thyroid hormones (T4).

GROSS NECROPSY
- Gross necropsy consisted of external and internal examinations including the cervical, thoracic, and abdominal viscera.

HISTOPATHOLOGY / ORGAN WEIGTHS
The tissues indicated in Table [#] were prepared for microscopic examination and weighed, respectively.
Statistics:
A statical assessment of the results of body weight, food consumption and litter data was performed for each gender by comparing values of dosed with control animals using a one-way ANOVA and a post-hoc Dunnett Test. Results of absolute and relative organ weights, parameters of haematology, blood coagulation and clinical biochemistry were statistically analysed by comparing values of dosed with control animals using either a parametric one-way ANOVA and a post-hoc Dunnett Test or a non-parametric Kruskal-Wallis Test and a post-hoc Dunn’s Test, based on the results of homogenei ty and normality tests. Statistical comparisons of data acquired during the recovery period werewill be performed with a Student’s t-Test. These statistics were performed with GraphPad Prism V.6.01 software or Ascentos 1.3.4 software (p<0.05 was considered as statistically significant.
Reproductive indices:
copulation, fertility, viability and delivery indices
Offspring viability indices:
Viability indices

Results and discussion

Results: P0 (first parental generation)

General toxicity (P0)

Clinical signs:
effects observed, treatment-related
Description (incidence and severity):
The following clinical signs were observed in the HD group and are assumed to be related to systemic toxicity of the test item: Haematuria was observed in male animal no. 33 which euthanized for animal welfare reasons on day 25 and also in male animal no. 38 transiently. Hypothermia was observed in male animals nos. 31 and 33. General signs of impaired health condition, like reduced spontaneous activity, piloerection and half eyelid closure observed only or mainly in the HD group are also likely to be test item- related.
Females of LD, MD and HD group showed clinical signs like moving the bedding and slight to mode rate salivation and males of the HD group showed moving the bedding immediately after administration during the treatment period. All these findings indicate local reactions to the oral gavage and are not assumed to be a sign of systemic toxicity.
No clinical signs were observed in C and HD recovery groups during the recovery period. Clinical signs like scratch, broken left incisor, cut on tongue, hairless area, regurgitation of the test material, sunken flanks and crust (ear) were observed mostly transiently or on single days and were within the normal background frequency.
During the weekly detailed clinical observation, no significant changes or differences between the groups were found during the treatment or recovery periods.

Dermal irritation (if dermal study):
not examined
Mortality:
mortality observed, treatment-related
Description (incidence):
Test item-related mortality was observed at a daily dose of 1000 mg/kg body weight/day in 5/15 male animals. Three animal (nos. 47, 40 and 48) were found dead on days 7, 10 and 12, respectively. Two animal (nos. 33 and 32) were euthanized for animal welfare reasons on days 11 and 25, respectively.
Body weight and weight changes:
effects observed, treatment-related
Description (incidence and severity):
The test item had no effect on body weight development in this study up to the MD level.
Moderate, but statistically significantly lower body weight gain in male animals was observed at HD during the treatment period when compared to controls and is considered to be toxicologically relevant. At the end of the treatment period, body weight was approximately 19.7 % (premating to post-mating day 14) and 17.4% (premating to terminal) below controls in this group and had even decreased slightly when compared to pre-treatment level.
A statistically significant decrease in body weight gain was also observed in HD recovery males du ring the treatment period (day 7-28). In this group a slight and statistically non-significant decrease in body weight (day 35 and 42) was seen during the recovery period.
Test item had no effect on body weight development in females of the HD group during premating, gestation and lactation period. However, slight and statistically significant lower body weight was observed in HD recovery females (day 7-14) during the recovery period.
Food consumption and compound intake (if feeding study):
effects observed, treatment-related
Description (incidence and severity):
The test item had no effect on food consumption up to the MD level. A tendency towards lower food consumption was observed in HD males during the treatment period. A slight decrease in food consumption was observed on day 1-7 during the recovery period in HD recovery males. Slight, but statistically significant lower food consumption was observed in females of the HD group towards end of gestation/lactation and. A slight decrease in food consumption was observed on day 1-14 during the recovery period in HD recovery females.
Food efficiency:
not examined
Water consumption and compound intake (if drinking water study):
not examined
Ophthalmological findings:
no effects observed
Haematological findings:
effects observed, treatment-related
Description (incidence and severity):
At the end of the treatment period a statistically significantly higher white blood cells count was found in male animals of the HD group (127 % above controls). This coincided with statistically non-significant decrease in the rate of lymphocytes (26 % below controls) and increase in the rate of neutrophils (122 % above controls). Moreover, monocytes were statistically significantly higher than controls (78 % above controls). Taken together these changes likely reflect inflammation in the renal system. In the HD group moderate, statistically significantly higher reticulocytes were observed at the end of the treatment period (males 100 % and females 60% above control) and in males at the end of the recovery period (130 % above control). This was not associated with changes in red blood cell parameters.
At the end of the recovery period also moderate and statistically significantly higher white blood cell count was observed in male but not female animals of the HD group (70% above controls). The rate of neutrophils and monocytes of HD group males was statistically significant higher (+62 % and +129 %, respectively) and that of lymphocytes statistically significant lower (-12 %). In HD females monocytes were also moderately statistically significant elevated (119 % above controls) at the end of the recovery period. Moreover, reticulocytes of male animals of the HD group were statistically significant higher (130 % above controls).
Slightly but statistically significant higher platelet count in the HD group at the end of the treatment period in males (39 % above controls) and females (25 % above controls) and at the end of the recovery period in males (30 % above controls) are not considered toxicologically relevant as values were within the range of historical control data. Coagulation was not affected by the test item. Minimal but statistical differences in PT in recovery HD male (23 % above control) are not considered to be biologically relevant, as the individual values were within the normal range of variation for this strain.
Clinical biochemistry findings:
effects observed, treatment-related
Description (incidence and severity):
A moderate to marked, dose dependent and statistically significant higher serum ALAT level (approx. 6-7-fold above control) and ASAT level (approx. 2-4-fold above control) was observed in males of the HD group at the end of treatment. Slight and statistically non-significant changes were also observed in these animals in serum AP, Chol, TBA levels. At the end of the recovery period ALAT and ASA T levels were markedly increased (>5-fold and >3-fold of controls, respectively) in these animals, however without statistically significance. ALAT and ASAT were also moderately but statistically nonsignificiant increased in female animals of the HD group (>4-fold and >2-fold of controls, respectively) at the end of the recovery period. This was accompanied by a slight, non-significant increase in TBA (>2-fold of controls). All above-mentioned findings are assumed to be related to hepatotoxicity observed histopathologically.
A single male animal of the LD group (no. 14) showed elevated ALAT, ASAT, TBA and Chol levels which coincided with necrosis in the liver.
In male animals of the HD group a slight, non-significant increase was found in UREA levels (31 % above controls) at the end of the treatment period. This is assumed to be related to histopathological findings in the renal system.
Slight and statistically significant increases in TP and Alb were observed in female animals of the HD group at the end of the recovery period (9 and 13 % above controls, respectively). These slight changes are not considered toxicologically relevant as there were no corresponding changes in globulin fraction or creatinine levels and they were not associated with histopathological findings
Urinalysis findings:
no effects observed
Description (incidence and severity):
The test item had no toxicologically relevant effect on urinary parameters analysed at the end of the treatment period and recovery period.
Blood and a high count of leukocytes were found in the urine of male animal no.14 of the LD group. This is assumed to be related to histopathological findings in the renal system.
Behaviour (functional findings):
no effects observed
Description (incidence and severity):
In males and females, no test item-related effects were observed in any of the parameters of the functional observation battery before and at the end of the treatment period and also at the end of recovery period.
Immunological findings:
not examined
Organ weight findings including organ / body weight ratios:
effects observed, treatment-related
Histopathological findings: non-neoplastic:
effects observed, treatment-related
Description (incidence and severity):
Liver: Test item-related changes were observed in decedent and surviving animals from the HD group only. In all moribund and decedent animals minimal to marked microvesicular fatty change was observed. Additionally, slight hepatocellular necrosis was noticed in the decedent Animal No. 33. In surviving animals from the HD group (treatment and recovery periods), minimal microvesicular fatty change was observed. Minimal hepatocellular necrosis (single cell necrosis) was also observed in Animal No. 39.
Further, in Animal No. 14 (LD group), hepatocellular necrosis was observed. The above-mentioned hepatic change was associated with severe congestion and moderate hemorrhage and was not considered to be a test item-related finding, but rather an incidental finding.
Kidney: Test item-related changes were observed in decedent and surviving animals from the HD group only. In decedent animals from the HD group, slight to moderate tubular dilatation and minimal tubular necrosis were observed. Furthermore, severe tubular dilatation, minimal to slight tubular necrosis, slight tubular basophilia and slight multifocal mineralization (dystrophic change) were observed.
In surviving males from the HD group (end of treatment period), moderate to severe tubular dilatation, minimal to moderate mononuclear and mixed cell infiltrates in the tubular lumen and renal interstitium, slight to moderate interstitial fibrosis, slight tubular necrosis, slight tubular basophilia and minimal to slight mineralization were observed. Additionally, moderate mixed cell infiltrates and minimal tubular dilatation were noticed in females from the same group,. In recovery males from the HD group, minimal to slight tubular dilatation, slight to moderate mixed cell infiltrates, minimal to slight mononuclear cell infiltrates, slight to moderate fibrosis, slight tubular necrosis and slight to moderate tubular basophilia were observed, whereas in females no histopathological changes were noticed.

Heart: Cardiac lesions that could be attributed to the treatment with the test item were observed in decedent recovery animals from the HD group only. These cardiac changes consisted of moderate myocardial mineralization, slight vascular mineralization (e.g. tunica media of aorta and few coronary vessels), slight cardiomyocytes necrosis and slight mononuclear infiltrates.
All other recorded findings were considered incidental or were within the range of spontaneous background alterations that may be recorded in Wistar rats at these ages. No histological evidence of toxicity in the reproductive organs and tissues including testes, epididymides, prostate gland, seminal vesicles, coagulating glands, ovaries, uterus and cervix, and vagina could be detected. The tubular stages of the spermatogenic cycle were checked for completeness of cell populations, completeness of stages and degenerative changes. No treatment-related effects on the testicular histomorphology were observed. Moreover, no treatment-related effect on interstitial cell structure was noticed.
Histopathological findings: neoplastic:
no effects observed
Other effects:
no effects observed

Reproductive function / performance (P0)

Reproductive function: oestrous cycle:
no effects observed
Description (incidence and severity):
no biologically significant effect on the estrous cycle in treatment groups when compared to the controls. There were no considerable changes in the length or sequence of cycle stages between the dose groups and the control group
Reproductive function: sperm measures:
no effects observed
Description (incidence and severity):
No treatment-related effects on the testicular histomorphology were observed. Further, no treatment-related effect on interstitial cell structure was noticed.
Reproductive performance:
no effects observed
Description (incidence and severity):
There were no test item- related effects on the reproductive indices (copulation, fertility, viability and delivery indices) in the dose groups when compared to the control group. In the HD group, a reduced copulation index of 90 % was observed compared to 100 % in the control group. This effect on copulation index was attributed to 1/10 in non-pregnant females and therefore, considered to be biological variation.

Effect levels (P0)

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: No adverse effects observed

Target system / organ toxicity (P0)

Critical effects observed:
no

Results: P1 (second parental generation)

General toxicity (P1)

Description (incidence and severity):
Pre- and Post-Natal Data - There were no test item treatment- related effects observed on the number of corpora lutea, implantation sites, live pups on PND 0, 4 and 13, percent pre-implantation loss and post implantation loss in LD, MD and HD groups when compared with the control group.

Anogenital Distance and Nipple Retention - In male and female pups, no test item- related effects in absolute and relative anogenital distance were observed in the dose groups when compared to the controls. No statistically significant effect or toxicological relevance was observed on nipple retention i n the male pups of any of the groups when compared with the controls.

Pup Survival Data - No test item-related effect on mean mortality of pups between PND 0 and PND 4 and during PND 4-13 in LD and HD groups. However, a slightly and statistically significant higher mean mortality of pups on PND 0-4 was observed in the MD group (5.41 %). As this effect was not dose-dependent, it is not considered to be an adverse effect of the test item.

Pup External Findings - No test item-related gross external abnormalities of toxicological relevance on PND 0-12 were observed in the pups of any of the groups. A few specific findings like flattened abdomen (pup no. 13 from dam no. 56) and missing tail tip (pup no. 1 from dam no. 60) of control group were observed. No indication of suckling on PND4 for the pups 1-15 from dam no. 68 of LD was observed. No indication of suckling on PND0 for pup 10 and dark head for the pup 4, 10 from dam no. 73 of MD werewas observed. All these findings were considered to be spontaneous and not related to test item treatment.

Results: F1 generation

General toxicity (F1)

Clinical signs:
no effects observed
Dermal irritation (if dermal study):
not examined
Mortality / viability:
mortality observed, treatment-related
Description (incidence and severity):
No test item-related effect on mean mortality of pups between PND 0 and PND 4 and during PND 4-13 in LD and HD groups. However, a slightly and statistically significant higher mean mortality of pups on PND 0-4 was observed in the MD group (5.41 %). As this effect was not dose-dependent, it is not considered to be an adverse effect of the test item.
Body weight and weight changes:
no effects observed
Description (incidence and severity):
There was no test item-related or statistically significant effect on pup mean weight, total litter weight, male litter weight, or female litter weight on PND 0, PND 4 and PND 13 observed in LD, MD and HD groups when compared with the controls.
Food consumption and compound intake (if feeding study):
not examined
Food efficiency:
not examined
Water consumption and compound intake (if drinking water study):
not examined
Ophthalmological findings:
not examined
Haematological findings:
not examined
Clinical biochemistry findings:
no effects observed
Description (incidence and severity):
No statistically significant effect or toxicological relevance was observed on serum T4 levels of PND 13 pups.
Urinalysis findings:
not examined
Sexual maturation:
not examined
Organ weight findings including organ / body weight ratios:
no effects observed
Description (incidence and severity):
No test item-related effect of toxicological relevance or statistical significance was observed on pup thyroid weight (male and female).
Gross pathological findings:
no effects observed
Description (incidence and severity):
No test item-related gross external abnormalities of toxicological relevance on PND 0-12 were observed in the pups of any of the groups.
A few specific findings like flattened abdomen (pup no. 13 from dam no. 56) and missing tail tip (pup no. 1 from dam no. 60) of control group were observed. No indication of suckling on PND4 for the pups 1-15 from dam no. 68 of LD was observed. No indication of suckling on PND0 for pup 10 and dark head for the pup 4 from dam no. 73 of MD were observed. All these findings were considered to be spontaneous and not related to test item treatment.
Histopathological findings:
no effects observed

Developmental neurotoxicity (F1)

Behaviour (functional findings):
not examined

Developmental immunotoxicity (F1)

Developmental immunotoxicity:
not examined

Effect levels (F1)

Key result
Dose descriptor:
NOAEL
Generation:
F1
Effect level:
>= 1 000 mg/kg bw/day (actual dose received)
Based on:
test mat.
Sex:
male/female
Basis for effect level:
other: No adverse effects observed

Target system / organ toxicity (F1)

Critical effects observed:
no

Overall reproductive toxicity

Reproductive effects observed:
no

Any other information on results incl. tables

Summary result rables and individual animal data result tables will be added at a later date when they are available.

Applicant's summary and conclusion

Conclusions:
In the Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test with 2,4,6-tris[3-(trimethoxysilyl)propyl] isocyanurate, conducted according to OECD Test Guideline 422 and in compliance with GLP, concluded a NOAEL of 1000 mg/kg bw/day for reproduction based on no effects observed at the highest dose tested.