Exo-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl acetate

Developmental toxicity / teratogenicity

Administrative data

Endpoint:

developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April 22th to May 28th 1991

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP and guideline compliance

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1992

Report date:

1992

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 414 (Prenatal Developmental Toxicity Study)

Deviations:

no

GLP compliance:

yes

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Exo-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl acetate

EC Number:

204-727-6

EC Name:

Exo-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl acetate

Cas Number:

125-12-2

Molecular formula:

C12H20O2

IUPAC Name:

1,7,7-trimethylbicyclo[2.2.1]hept-2-yl acetate

Details on test material:

- Name of test material (as cited in study report): Isobornylacetat-Extra
- Physical state: liquid
- Analytical purity: 93.5 – 95.0 % Isobornylacetat
- Impurities (identity and concentrations): other terpene esters and camphene
- Composition of test material, percentage of components:
94.6 % Isobornylacetat
2.8 % Isofenchylacetat
0.8 % Pseudobornylacetat
0.5 % Fenchylacetat
0.4 % Isoborneol
0.1 % Camphen
- Lot/batch No.: 249/90
- Storage condition of test material: dark, at room temperature

Test animals

Species:

rat

Strain:

Wistar

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Hoe: WISKf (SPF71)
- Age at study initiation:65-70 days
- Weight at study initiation: 191 + / - 6 g
- Housing: individually in plastic cages
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: at least 7 days prior the test
- Sex: female

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21-24 ° C
- Humidity (%): 49-53%
- Air changes (per hr): 16-20/h
- Photoperiod (hrs dark / hrs light): 12 light hours a day

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

other: sesame oil

Details on exposure:

PREPARATION OF DOSING SOLUTIONS: the substance was dissolved fresh daily in a concentration of 200 g/l in sesame oil. The applied fluid volume was in all animals 5 ml/kg body weight.

VEHICLE
- Amount of vehicle (if gavage): 5 ml/kg bw dose

Details on mating procedure:

- Proof of pregnancy: sperm in vaginal smear referred to as day 1 of pregnancy

Duration of treatment / exposure:

days 7 to 16 of gravity

Frequency of treatment:

once daily, administered within three hours

Duration of test:

Sacrifice at day 21 of gravity

No. of animals per sex per dose:

20 mated females: test group
21 mated females: control group

Control animals:

yes

Examinations

Maternal examinations:

DETAILED CLINICAL OBSERVATIONS: Yes

BODY WEIGHT: Yes
- Time schedule for examinations: once a week and a day after the last application

POST-MORTEM EXAMINATIONS: Yes
- Sacrifice on gestation day # 21
- Organs examined: uterus, ovaries

OTHER:
Macroscopic examination and weighing of the organs: heart, liver, kidneys and spleen

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 resorptions: Yes

Fetal examinations:

- External examinations: Yes
- Skeletal examinations: Yes: half per litter
- Body cross-sections for Wilson, photography: half per litter

Statistics:

Comparisons between body weights and organ weights in the test and control group were performed with a classical analysis of variance (MANOVA); to evaluate the relative feed intake, a analysis of variance according to Puri & Sen (1985).
Corpora lutea and implantations were performed with the Mantel-Haenszel x2 test (Mantel & Haenszel, 1959), as well as live and dead fetuses and resorptions. Other parameters according to an analysis of variance.
The body cross-sectional study of fetuses and skeletal findings were studied with the Fisher Exact test.

Historical control data:

To compare the data with historical controls, normal ranges were calculated for groups.

Results and discussion

Results: maternal animals

Maternal developmental toxicity

Details on maternal toxic effects:

Maternal toxic effects:no effects

Effect levels (maternal animals)

Dose descriptor:

NOAEL

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

other: maternal toxicity

Results (fetuses)

Details on embryotoxic / teratogenic effects:

Embryotoxic / teratogenic effects:no effects

Effect levels (fetuses)

1

Dose descriptor:

NOAEL

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

other: embryotoxicity

2

Dose descriptor:

NOAEL

Effect level:

1 000 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

All findings did not differ from those of control group out of the spontaneous rate.

Applicant's summary and conclusion

Conclusions:

No maternal toxic effects, no embryonic/fetal toxic effects and no teratogenic effect at oral doses of 1000 mg/kg bw/day in rats.

Executive summary:

Isobornylacetate-extra was tested in a limit test of a group of 20 female Wistar rats from 7 to 16 day of gravity, administered once daily in a dose of 1000 mg / kg bw. As a control, was an equally large group of control animals that received the vehicle without substance addition.On 21 days of gestation were killed the mother animals and examined. Fetuses were morphologically observed for developmental disorders. The morphological examination of fetuses revealed no evidence for embryotoxic and teratogenic effects of the substance. The findings are assigned to the spontaneous rate. Neither maternal nor embryonic/fetal toxicity was found at oral doses of 1000 mg/kg bw/day IBA in rats.An indication of teratogenic effect could not be noticed.