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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:
15-03-2010 to 06-08-2010
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Limit test:
no

Test material

Constituent 1
Reference substance name:
Flue dust, portland cement
EC Number:
270-659-9
EC Name:
Flue dust, portland cement
Cas Number:
68475-76-3
Molecular formula:
It is a UVCB.
IUPAC Name:
tricalcium dipotassium silanedione carbonate sulfate silicate
Details on test material:
The test substance was supplied by the sponsor. Two containers each containing 800 g Flue dust T (REACH) were received in good condition on 4 March 2010. Gross weights were 870.95 g and 875.67 g, respectively. This batch was given TNO Dispense Reference No. 10005B.

The following characteristics were provided by the sponsor:

Name : Flue dust T (REACH)
Other names : Flue dust, Portland cement (EC number 270-659-9); Cement kiln dust
Colour / appearance : Beige/grey powder
CAS reg. number : 68475-76-3
Purity : UVC substance
Storage conditions : Ambient temperature
Batch number : 12-2009
Expiry date : 1 December 2010

The certificate of analysis pertaining to the batch of test substance used during this study was
provided by the sponsor.

Test animals

Species:
rat
Strain:
Wistar
Details on test animals or test system and environmental conditions:
The rat was chosen because this species is considered one of the most suitable species for this type of study, and is usually required for regulatory agencies. Wistar outbred rats, 8-9 weeks, were obtained from a colony maintained under SPF conditions from Charles River Wiga GmbH, Sulzfeld, Germany.

Upon arrival, the rats were quarantined (animal room 05.1.11, DRF and main study) and checked for overt signs of ill health and abnormalities. During the quarantine period serological examinations of the microbiological status of the rats were conducted in a random sample. After 5 days (DRF) and 2 days (main study) the results of serology appeared to be satisfactory and the animal room was cleared for use as experimental room. The animals were acclimatized to the laboratory conditions for 6 days. The day before the first exposure (day -1 of the study), on 15 March 2010 (DRF) and 5 April 2010 (main study), the animals (males and females separately) were allocated to the various groups by computer randomization proportionately to body weight (DRF: Appendix 1; main study: Appendix 6). Surplus animals were kept in the animal room for monitoring during the study. They were sacrificed at the end of the in-life segment of the study.

Administration / exposure

Route of administration:
oral: feed
Vehicle:
other: rodent diet
Details on exposure:
Feed and drinking water were provided ad libitum from the arrival of the rats until the end of the study.
The rats received a cereal-based (closed formula) rodent diet (Rat & Mouse No. 3 Breeding Diet, RM3) from a commercial supplier (SDS Special Diets Services, Witham, England). Each batch of RM3 diet was analysed by the supplier for nutrients and contaminants. The certificates of analysis pertaining to the batch (no. 7388) used in this study are included in Annex 3 of this report. The feed was provided as a powder, in stainless steel cans, covered by a perforated stainless steel plate that served to prevent spillage. The feed in the feeders was refreshed twice per week during the dose-range finding study and once per week during the main study.
Each cage was supplied with domestic mains tap-water suitable for human consumption (quality guidelines according to Dutch legislation based on EC Council Directive 98/83/EC). The water was given in polypropylene bottles, which were cleaned weekly and filled as needed. Results of the routine physical, chemical and microbiological examination of drinking water as conducted by the supplier were made available to the test facility. In addition, the supplier periodically (twice
per year) analyses water samples taken at the premises of TNO in Zeist for a limited number of physical, chemical and microbiological variables.
Analytical verification of doses or concentrations:
yes
Details on analytical verification of doses or concentrations:
Analyses to determine the homogeneity and content of aluminium of the test substance in the diets of the main study wase conducted using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), after melting of the diet with a mixture of sodium carbonate and sodium borate.
Before analysis of study samples, the method was validated for the matrix under examination (viz. the rodent diet RM3) to conform to the following criteria: - Linearity: the correlation coefficient of the calibration curves should be greater than or equal to
0.996;
- Recovery: the recovery of the test substance from test diet should be between 80% and 110% at each of the concentrations tested;
- Repeatability: the relative standard deviation in the percentage recovery of three spiked diet samples per concentration level should be less than 10%.
Samples were taken from the batch of experimental diets prepared in the dose-range finding study as backup samples for possible analysis in the analytical validation process. These samples were not used and they will be discarded at finalization of the report.
The homogeneity and content (achieved concentration) of the test substance in the experimental diets was demonstrated in the batch of diets used in the main study, by analysing five samples (taken at different locations in the feed container) of each test diet; one sample of the control diet was analysed in the same series.
Analysis for stability of the test substances in the diet were not conducted, since it is not possible to measure stability in a complex mixture. In addition, aluminium is known to be stable in the diet.
Details on mating procedure:
At the end of the premating period, each female was caged with one male from the same group. Animals were caged together until mating occured or 1 week had elapsed. Mating pairs were clearly identified. Every consecutive morning during the mating period, vaginal smears were made for determination of the presence of sperm. The day on which sperm was detected in the vaginal smear was considered as gestation day 0. Upon evidence of copulation the females were caged individually for the birth and rearing of their pups. Sperm positive females that turned out to be non-pregnant were killed not earlier than 21 days after copulation. Females that did not show evidence of copulation after the end of the one-week mating period were also housed individually until sacrifice (not earlier than 20 days after the last day of the mating period). The morning after birth is considered day 1 post partum. Consequently, for litters that were born during the day, but after the morning observation, that day was considered day 0 post partum. Dams were allowed to raise their litter until sacrifice on day 4 of lactation or shortly thereafter. Males were euthanized after 30 days of exposure.
Duration of treatment / exposure:
male rats 28 days
female rats 6-7 weeks
Frequency of treatment:
daily
No. of animals per sex per dose:
3
Control animals:
yes, plain diet
Details on study design:
Preceding the main study, Flue dust T (REACH) was studied in a 1-week dose-range finding study at dose levels of 0, 2,500, 5,000, 10,0000 or 20,000 mg Flue dust T (REACH)/kg diet. Body weight change of the female animals of the top-dose group (20,000 mg/kg diet) was statistically significantly decreased between day 3-7 of the study. No other treatment-related effects were observed.
Considering the duration of the main study, at least 28 days for males and approx. 6-7 weeks for females, the following dose levels were chosen for the main study: 0 (control), 2,000 (low-dose), 6,000 (mid-dose) and 16,000 (high-dose) mg Flue dust T (REACH)/kg diet. It was intended that the mean substance intake in the high-dose group was comparable to approx. 1 g Flue dust T (REACH)/kg body weight/day.

The objective of this main study was to provide data on the possible effects of Flue dust T (REACH) on the reproductive performance of male and female Wistar Crl:Wi(WU) rats and on the growth and development of the offspring after oral exposure via the diet.
Groups of 12 animals/sex were administered via the diet with 0, 2,000, 6,000 or 16,000 mg Flue dust T (REACH)/ kg diet for 30 days (males) or during 2 weeks premating, mating gestation and up to day 4 of lactation or shortly thereafter (females).
Clinical signs were determined at least daily. Detailed clinical observations outside the home cage were performed prior to the first exposure and then once weekly. Functional Observational Battery (FOB) tests, including assessment of grip strength and sensory reactivity to stimuli of different types, and spontaneous motor activity measurements were performed in 5 males/group prior to the end of dosing and 5 females/group prior to day 4 of lactation.
Body weight and food consumption were recorded once weekly. Prior to the end of the premating period, 5 rats/sex/group were fasted overnight and blood was taken for haematology and clinical chemistry. Male and female animals were mated within the groups. Female animals were allowed to litter. The total litter size and numbers of each sex as well as the number of stillbirths, live- and dead pups and grossly malformed pups were evaluated on
days 1 and 4 of lactation. The pups were individually weighed on days 1 and 4 of lactation. Females and their pups were sacrificed at or shortly after day 4 of lactation. Male animals were sacrificed after 30 days of administration of the test substance. Reproductive organs of 12 animals/sex/group were preserved and thereafter microscopically examined. The testes and epididymides of these animals were weighed. In addition, for 5 animals/sex/group extra organs were weighed and preserved and thereafter microscopically examined.

Results and discussion

Results: maternal animals

Maternal developmental toxicity

Details on maternal toxic effects:
Maternal toxic effects:no effects

Effect levels (maternal animals)

Key result
Dose descriptor:
NOAEL
Effect level:
>= 1 010 - <= 1 216 mg/kg bw/day (nominal)
Based on:
test mat.
Basis for effect level:
other: developmental toxicity

Results (fetuses)

Details on embryotoxic / teratogenic effects:
Embryotoxic / teratogenic effects:no effects

Effect levels (fetuses)

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:
Body weight change of the female animals of the high-dose group (16,000 mg/kg diet) was statistically significantly decreased during the lactation period.. No other treatment-related effects were observed on body weight and body weight change in the male and female animals.

No exposure-related differences were observed on food consumption.

No effect was observed on the fertility and reproduction parameters.

No statistically significant or exposure-related differences were observed in the litter data between the control and the Flue dust T (REACH)-dosed groups.

Haemoglobin and mean corpuscular volume were statistically significantly decreased in high-dose females. Haemoglobin also tended to be decreased in high-dose males. In males of the high-dose group, a statistically significant increase was observed in the mean amount of plasma urea. Urea also tended to be increased in high-dose females. No other relevant differences were observed on haematology and clinical chemistry between the control and the groups of animals dosed with Flue Dust T (REACH).

No treatment-related differences were observed in the reproductive organ weights of all male animals. The organ weights of the control and Flue dust T (REACH)-dosed groups recorded in 5 animals/sex/group: adrenals, brain, heart, kidneys, liver, lung, spleen, stomach and thymus did not show treatment-related differences.
Microscopic examination of testes, epidymides, seminal vesicle, prostate, uterus and ovaries of 12 animals/sex of the control and high-dose groups, did not reveal any treatment-related effects. Microscopic examination of the adrenals, brain, caecum, colon, femur, heart, kidneys, larynx, liver, lung, nasal cavity, rectum, small intestines, spinal cord, spleen, stomach, thymus, thyroid, trachea/bronchi, and trachea/bronchial lymph nodes in 5 animals/sex of the control and high-dose groups did not reveal treatment-related histopathological changes in any of the sampled organs and tissues.

Based on the results found in this study (decreased body weight change during lactation, decreased haemoglobin in females and increased plasma urea in males) the No Observed Adverse Effect Level for parental toxicity was 6,000 mg Flue dust T (REACH)/kg diet (374 and 483 mg Flue dust T (REACH)/kg body weight, respectively for male and female animals). The No Observed Adverse Effect Level for fertility and developmental toxicity was 16,000 mg Flue dust T (REACH)/kg diet as no effects were observed at the highest dose-level used in this study (1010 and 1216 mg Flue dust T (REACH)/kg body weight, respectively for male and female animals).
Executive summary:

1. Preceding the main study, Flue dust T (REACH) was studied in a 1-week dose-range finding study at dose levels of 0, 2,500, 5,000, 10,0000 or 20,000 mg Flue dust T (REACH)/kg diet. Body weight change of the female animals of the top-dose group (20,000 mg/kg diet) was statistically significantly decreased between day 3-7 of the study. No other treatment-related effects were observed. Considering the duration of the main study, at least 28 days for males and approx. 6-7 weeks for females, the following dose levels were chosen for the main study: 0 (control), 2,000 (low-dose), 6,000 (mid-dose) and 16,000 (high-dose) mg Flue dust T (REACH)/kg diet. It was intended that the mean substance intake in the high-dose group was comparable to approx. 1 g Flue dust T (REACH)/kg body weight/day.

2. The objective of this main study was to provide data on the possible effects of Flue dust T (REACH) on the reproductive performance of male and female Wistar Crl:Wi(WU) rats and on the growth and development of the offspring after oral exposure via the diet. Groups of 12 animals/sex were administered via the diet with 0, 2,000, 6,000 or 16,000 mg Flue dust T (REACH)/ kg diet for 30 days (males) or during 2 weeks premating, mating gestation and up to day 4 of lactation or shortly thereafter (females). Clinical signs were determined at least daily. Detailed clinical observations outside the home cage were performed prior to the first exposure and then once weekly. Functional Observational Battery (FOB) tests, including assessment of grip strength and sensory reactivity to stimuli of different types, and spontaneous motor activity measurements were performed in 5 males/group prior to the end of dosing and 5 females/group prior to day 4 of lactation. Body weight and food consumption were recorded once weekly. Prior to the end of the premating period, 5 rats/sex/group were fasted overnight and blood was taken for haematology and clinical chemistry. Male and female animals were mated within the groups. Female animals were allowed to litter. The total litter size and numbers of each sex as well as the number of stillbirths, live- and dead pups and grossly malformed pups were evaluated on days 1 and 4 of lactation. The pups were individually weighed on days 1 and 4 of lactation. Females and their pups were sacrificed at or shortly after day 4 of lactation. Male animals were sacrificed after 30 days of administration of the test substance. Reproductive organs of 12 animals/sex/group were preserved and thereafter microscopically examined. The testes and epididymides of these animals were weighed. In addition, for 5 animals/sex/group extra organs were weighed and preserved and thereafter microscopically examined.

3. The content of Flue dust T (REACH) was considered to be close to the intended concentration for the mid-dose and high-dose level. At the low-dose level the determined content of Flue dust T (REACH) was higher than intended, but this was attributed to analytical variation resulting from the high level of aluminium in the blank diet.

4. Overall test substance intake (mg Flue dust T (REACH)/kg body weight/day)

Low-dose 2,000 mg/kg diet*           Mid-dose 6,000 mg/kg diet*       High-dose 16,000 mg/kg diet*

Males:       119                                                  374                                                 1010

Females:   164                                                  483                                                 1216

Overall intake during the entire study *concentration in the diet

5. No mortalities or treatment-related clinical observations were observed.

6. Weekly detailed clinical observation and neurobehavioural testing did not indicate a treatment-related effect.

7. Body weight change of the female animals of the high-dose group (16,000 mg/kg diet) was statistically significantly decreased during the lactation period. No other treatment-related effects were observed on body weight and body weight change in the male and female animals.

8. No exposure-related differences were observed on food consumption.

9. No effect was observed on the fertility and reproduction parameters.

10. No statistically significant or exposure-related differences were observed in the litter data between the control and the Flue dust T (REACH)-dosed groups.

11. Haemoglobin and mean corpuscular volume were statistically significantly decreased in highdose females. Haemoglobin also tended to be decreased in high-dose males. In males of the high-dose group, a statistically significant increase was observed in the mean amount of plasma urea. Urea also tended to be increased in high-dose females. No other relevant differences were observed on haematology and clinical chemistry between the control and the groups of animals dosed with Flue Dust T (REACH).

12. No treatment-related differences were observed in the reproductive organ weights of all male animals. The organ weights of the control and Flue dust T (REACH)-dosed groups recorded in 5 animals/sex/group: adrenals, brain, heart, kidneys, liver, lung, spleen, stomach and thymus did not show treatment-related differences.

13. Microscopic examination of testes, epidymides, seminal vesicle, prostate, uterus and ovaries of 12 animals/sex of the control and high-dose groups, did not reveal any treatment-related effects.

14. Microscopic examination of the adrenals, brain, caecum, colon, femur, heart, kidneys, larynx, liver, lung, nasal cavity, rectum, small intestines, spinal cord, spleen, stomach, thymus, thyroid, trachea/bronchi, and trachea/bronchial lymph nodes in 5 animals/sex of the control and high-dose groups did not reveal treatment-related histopathological changes in any of the sampled organs and tissues.

15. Based on the results found in this study (decreased body weight change during lactation, decreased haemoglobin in females and increased plasma urea in males) the No Observed Adverse Effect Level for parental toxicity was 6,000 mg Flue dust T (REACH)/kg diet (374 and 483 mg Flue dust T (REACH)/kg body weight, respectively for male and female animals). The No Observed Adverse Effect Level for fertility and developmental toxicity was 16,000 mg Flue dust T (REACH)/kg diet as no effects were observed at the highest dose-level used in this study (1010 and 1216 mg Flue dust T (REACH)/kg body weight, respectively for male and female animals).