isliFe

Developmental toxicity / teratogenicity

Administrative data

Endpoint:

developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1995

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP compliant guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1995

Report date:

1995

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 414 (Prenatal Developmental Toxicity Study)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EPA OPP 83-3 (Prenatal Developmental Toxicity Study)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OTS 798.4900 (Prenatal Developmental Toxicity Study)

Deviations:

no

GLP compliance:

yes

Limit test:

no

Test material

Test material information

Constituent 1

Details on test material:

- Test article: CGA65047 SG 100 (A-5787 A)
- Physical state: granules
- Lot/batch No.: P.201845
- Storage condition of test material: room temperature
- Analytical purity: 100 % (UVCB)

Test animals

Species:

rat

Strain:

other: Sprague-Dawley derived; Tif:RAIf (SPF); hybrids of RII/1 x RII/2

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Animal Production, WST-455, CIBA-GEIGY Limited, 4332 Stein, Switzerland
- Age at mating: minimum 8 weeks
- Weight range on gestation day 0: 176.8-231.5 g (females)
- Diet: pelleted, certified standard diet (Nafag No. 890, tox; Nafag, Nähr- und Futtermittel AG, Gossau, Switzerland), provided ad libitum
- Water: tap water, ad libitum
- Acclimation period: at least 7 days

ENVIRONMENTAL CONDITIONS
- Temperature: 22 ± 3 °C
- Humidity: 50 ± 20 %
- Air changes: about 16 air changes/hour
- Photoperiod: 12 hours dark / 12 hours light

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

CMC (carboxymethyl cellulose)

Remarks:

0.5 % (w/w) aqueous solution

Details on exposure:

PREPARATION OF DOSING SOLUTIONS
Test substance-vehicle mixtures were prepared with a high speed homogeniser. Homogeneity of the mixtures during administration was maintained with a magnetic stirrer.

VEHICLE
A 0.5 % (w/w) aqueous solution of sodium carboxymethyl cellulose (CMC) was used
- Concentration in vehicle: 0, 0.5, 10.0 and 50.0 mg/mL mixture
- Amount of mixture: 10 mL/kg bw

Analytical verification of doses or concentrations:

yes

Details on analytical verification of doses or concentrations:

Samples of test substance-vehicle mixtures were taken once before (samples taken from top, middle and bottom of the container) and once after dosing (sample taken from middle of the container) and analysed for content, homogeneity and stability of the test item in the vehicle.

Details on mating procedure:

- Impregnation procedure: cohoused
- M/F ratio per cage: 1/3
- Length of cohabitation: 3-6 hours
- The mating procedure was repeated for non-pregnant females
- Verification of same strain and source of both sexes: yes
- Proof of pregnancy: vaginal plug or sperm in vaginal smear referred to as day 0 of pregnancy

Duration of treatment / exposure:

from day 6 to day 15 of gestation

Frequency of treatment:

1x/day

Duration of test:

21 days

Doses / concentrations

Remarks:

Doses / Concentrations:
0, 5, 100 and 500 mg/kg bw/day
Basis:
nominal conc.

No. of animals per sex per dose:

24 rats

Control animals:

yes, concurrent vehicle

Details on study design:

- Dose selection rationale:
Dose levels were selected based on the results of a previous range finding study no. 941104 in pregnant rat.

Examinations

Maternal examinations:

CAGE SIDE OBSERVATIONS:
- Time schedule: daily (incl. mortality)

BODY WEIGHT:
- Time schedule for examinations: daily

FOOD CONSUMPTION
- Time schedule for examinations: days 6, 11, 16 and 21

POST-MORTEM EXAMINATIONS:
- Sacrifice on gestation day 21
- Organs examined: main organs of the thoracic and abdominal cavities, in particular the genitals

Ovaries and uterine content:

The ovaries and uterine content was examined after termination.
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: uterine content assessment (live and dead foetuses, early and late losses)

Fetal examinations:

- External examinations: Yes: [all per litter]
- Soft tissue examinations: Yes: [approximately half per litter]
- Skeletal examinations: Yes: [approximately half per litter]
- Head examinations: Yes: [all per litter]

Statistics:

Statistical analysis of continuous data was performed using the Analysis of Variance Procedure (ANOVA) followed by Dunnett's t-test in case of a significant result in the ANOVA. Categorical data were analysed using Chi-Square test followed by Fisher's Exact test in case of a significant result in the Chi Square test. Non-parametric data were analysed during the Kruskal-Wallis non-parametric analysis of variance test followed by Mann-Whitney U-test.

Indices:

No indices were calculated

Historical control data:

Historical control data were included in the report.

Results and discussion

Results: maternal animals

Maternal developmental toxicity

Details on maternal toxic effects:

Maternal toxic effects:yes

Details on maternal toxic effects:
There was a reduction in mean food consumption and body weight gain during the second half of the dosing period at 500 mg/kg bw/day.

Effect levels (maternal animals)

1

Dose descriptor:

NOEL

Effect level:

100 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

other: maternal toxicity

2

Dose descriptor:

NOEL

Effect level:

500 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

other: developmental toxicity

Results (fetuses)

Details on embryotoxic / teratogenic effects:

Embryotoxic / teratogenic effects:no effects

Details on embryotoxic / teratogenic effects:
There was no indication for test item related embryotoxicity or teratogenic effects under the conditions of this study.

Effect levels (fetuses)

Dose descriptor:

NOEL

Effect level:

500 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

other: teratogenicity

Fetal abnormalities

Abnormalities:

not specified

Overall developmental toxicity

Developmental effects observed:

not specified

Any other information on results incl. tables

Chemical Analysis

Administration / Treatment 1:

The mean concentrations of the test item in the vehicle were 88.1 % (0.5 mg/mL) , 94.0 % (10 mg/mL) and 93.3 % (50 mg/mL) of the nominal concentrations for the low mid and high dose groups, respectively. The homogeneity varied in the range from -2 % to 4 % of the mean concentration. The test item was stable in the vehicle.

Administration / Treatment 2:

The mean concentrations of the test item in the vehicle were 94.9 % (0.5 mg/mL) , 93.9 % (10 mg/mL) and 94.1 % (50 mg/mL) of the nominal concentrations for the low mid and high dose groups, respectively. The homogeneity varied in the range from -1 % to 1 % of the mean concentration. The test item was stable in the vehicle.

Applicant's summary and conclusion

Executive summary:

In a developmental toxicity study (CIBA-GEIGY, 1995), FeNa-EDDHA was administered once daily to groups of 24 mated female Sprague-Dawley derived rats by oral gavage at dose levels of 5, 100 or 500 mg/kg bw/day (10 mL/kg bw) from day 6 through day 15 of gestation. Control group females received the vehicle, 0.5 % (w/w) CMC in distilled water, only. The nominal concentrations, homogeneity and stability of the test item in the vehicle were confirmed by chemical analysis of dose formulations. All dams were sacrificed on day 21 of the gestation period and foetuses removed for examination. In dams, there were no treatment-related clinical signs or incidences of mortality. The body weight gain was reduced at 500 mg/kg bw/day for the period from days 6 -16 of gestation, and reduced food consumption was also noted at this dose level. No adverse effects on pregnancy and no embryo-/foetotoxic effects were observed. There was no indication of teratogenic potential. On the basis of these results, the NOEL was 100 mg/kg bw/day for maternal toxicity and 500 mg/kg bw/day for develomental toxicity and teratogenicity.

The developmental toxicity study in the rat is classified as acceptabel and satisfies the requirements of test guideline OECD 414.