(1S,4R,4aS,9aR)-4,4a,9,9a-tetrahydro-1H-1,4-methanofluorene

Endpoint summary

Key value for chemical safety assessment

Effects on fertility

Link to relevant study records

Reference

Endpoint:

two-generation reproductive toxicity

Remarks:

based on test type (migrated information)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11 February 2013 - 12 July 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study performed according to OECD Guideline and in compliance with GLP.

Qualifier:

according to guideline

Guideline:

OECD Guideline 421 (Reproduction / Developmental Toxicity Screening Test)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Species:

rat

Strain:

other: Crl: CD(SD)

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: reputable commercial supplier
- Age at study initiation: ca 71 days old
- Weight at study initiation: Males: 336-390 g; Females: 234-284 g;
- Fasting period before study: no
- Housing: Cages comprised of a polycarbonate or polypropylene body with a stainless steel mesh lid; changed at appropriate intervals.
Solid (polycarbonate) bottom cages were used during the acclimatisation, pre-pairing, gestation, littering and lactation periods.
Polypropylene cages with a grid bottom were used during pairing. These were suspended above absorbent paper which was changed daily.
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: 6 days before commencement of treatment

ENVIRONMENTAL CONDITIONS
- Temperature (°C) and Humidity (%): Monitored and maintained within the range of 19-23 ºC and 40-70 %.
- Air changes (per hr): Filtered fresh air which was passed to atmosphere and not recirculated.
- Photoperiod (hrs dark / hrs light): Artificial lighting, 12 hours light : 12 hours dark

IN-LIFE DATES: From: 18th February 2013 To: 05th May 2013

Route of administration:

oral: gavage

Vehicle:

other: 0.1% Tween 80

Details on exposure:

PREPARATION OF DOSING SOLUTIONS:

VEHICLE
- Justification for use and choice of vehicle (if other than water): vehicle assessed in preliminary study and used for other animal testing studies
- Concentration in vehicle: 0.1%
- Amount of vehicle (if gavage): 10 mL/kg
- Lot/batch no. (if required): N/a
- Purity: As supplied

Details on mating procedure:

- M/F ratio per cage: 5/5 (during pre-pairing) and 1/1 (during pairing)

- M/F ratio per cage: 5/5 (during pre-pairing) and 1/1 (during pairing)
- Length of cohabitation: up to two weeks
- Proof of pregnancy: Ejected copulation plugs. sperm in vaginal smear referred to as day 1 of pregnancy
- After successful mating each pregnant female was caged (how): one female per cage

Analytical verification of doses or concentrations:

yes

Duration of treatment / exposure:

4 weeks

Frequency of treatment:

once daily

Details on study schedule:

Duration of treatment
F0 animals
Males - for a minimum of four weeks, including 15 days before pairing.
Females - for 15 days before pairing until Day 6 after birth of the

F1 generation.
F1 animals No direct treatment

Dose / conc.:

0 mg/kg bw/day (nominal)

Remarks:

Control

Dose / conc.:

60 mg/kg bw/day (nominal)

Dose / conc.:

200 mg/kg bw/day (nominal)

Dose / conc.:

600 mg/kg bw/day (nominal)

No. of animals per sex per dose:

Three groups, each comprising ten male and ten female

Control animals:

yes, concurrent vehicle

Clinical signs:

no effects observed

Description (incidence and severity):

There were no signs associated with dosing and no general clinical signs related to treatment.

Mortality:

mortality observed, non-treatment-related

Description (incidence):

Treatment up to 600 mg/kg/day was well tolerated, with no adverse effects on general condition or signs related to treatment. One female treated at 600 mg/kg/day was killed for
welfare reasons as it displayed signs of distress, had abdominal distension and was bleeding from the vagina. Macroscopic examination revealed that parturition had been incomplete with
two dead fetuses, two live fetuses and four placentae present in the uterus. This was considered to be the result of an unfortunate normal biological event and not related to
treatment.

Body weight and weight changes:

effects observed, non-treatment-related

Description (incidence and severity):

It was considered that there was no treatment related effect on body weight gain or food consumption on adult males or females during the two-week pre-mating period and no effect
on body weight during gestation or early lactation (to Day 7 post-partum). Males treated at 60, 200 or 600 mg/kg/day had low mean body weight gain during the week after pairing and
females receiving 600 mg/kg/day had marginally low food consumption during the first week of treatment and marginally high food consumption was seen in treated females during
gestation (Days 10-13); however, they were considered not to be toxicologically significant.

Food consumption and compound intake (if feeding study):

effects observed, non-treatment-related

Description (incidence and severity):

It was considered that food consumption was not affected by treatment, during the two week pre-pairing period, or during gestation or lactation.
Food consumption of females treated at 600 mg/kg/day was marginally low (X 0.87 Control) during the first week of treatment and was marginally high in treated females during gestation
(Days 10-13 only), when compared with Control, but these incidences were considered to be un-related to treatment.

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Behaviour (functional findings):

not specified

Immunological findings:

not specified

Organ weight findings including organ / body weight ratios:

no effects observed

Histopathological findings: non-neoplastic:

no effects observed

Description (incidence and severity):

There were no changes observed in the reproductive organs which were considered to be related to treatment with MTF.
The seminiferous tubules of the testes were evaluated with respect to their stage in the spermatogenic cycle and the integrity of the various cell types present within the different
stages. No cell or stage specific abnormalities were noted. Two males treated at 600 mg/kg/day had pale areas on the liver and the liver of another male
was enlarged. Histopathological investigation revealed centrilobular hypertrophy, which was considered to be an adaptive change resulting from exposure to the test substance.

Histopathological findings: neoplastic:

not specified

Other effects:

not specified

Description (incidence and severity):

A higher proportion of females had regular cycles of 4/5 days than expected at 600 mg/kg/day, when compared with Control. The reason for this finding is not known, but as other
investigations for reproductive performance were not affected by treatment, it was considered not to represent an adverse effect of treatment.

Reproductive function: sperm measures:

not specified

Reproductive performance:

no effects observed

Description (incidence and severity):

Pre-coital interval, mating performance and fertility were not affected by treatment. One Control animal (No. 42) was not pregnant and had no sign of any implantations pre and post staining.

There were no changes observed in the reproductive organs which were considered to be related to treatment with MTF. There was considered to be no effect of treatment on pre-coital interval, mating performance, fertility, gestation length, gestation index, sex ratio or survival and development of the offspring, or macroscopic change in the offspring.

Key result

Dose descriptor:

NOAEL

Effect level:

600 mg/kg bw/day

Based on:

test mat.

Sex:

male/female

Basis for effect level:

clinical signs

body weight and weight gain

food consumption and compound intake

organ weights and organ / body weight ratios

gross pathology

histopathology: non-neoplastic

reproductive function (oestrous cycle)

reproductive performance

Key result

Critical effects observed:

no

Clinical signs:

effects observed, non-treatment-related

Description (incidence and severity):

Clinical signs recorded for the offspring identified occasional pups with findings, but the type of findings (i.e. cold to touch, bruised muzzle) and incidence were typical of post-natal
offspring and showed no relationship to treatment.

Mortality / viability:

no mortality observed

Description (incidence and severity):

There was no effect of treatment on litter size, offspring survival or sex ratio.

Body weight and weight changes:

no effects observed

Description (incidence and severity):

The slightly higher body weight gain of offspring between Days 1 and 4 of age, following parental treatment at 200 or 600 mg/kg/day, was attributed to the marginally low gains seen
in the Control and low dose group (60 mg/kg/day), which was attributed to the higher than expected mean litter size in these groups.

Food consumption and compound intake (if feeding study):

not specified

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Sexual maturation:

not specified

Organ weight findings including organ / body weight ratios:

not specified

Gross pathological findings:

not specified

Histopathological findings:

not specified

There was considered to be no effect of treatment on pre-coital interval, mating performance, fertility, gestation length, gestation index, sex ratio or survival and development of the
offspring, or macroscopic change in the offspring.

Key result

Dose descriptor:

NOAEL

Generation:

F1

Effect level:

600 mg/kg bw/day (actual dose received)

Based on:

test mat.

Sex:

male/female

Basis for effect level:

viability

clinical signs

body weight and weight gain

gross pathology

Key result

Critical effects observed:

no

Key result

Reproductive effects observed:

no

Conclusions:

It is concluded that once daily oral administration of MTF to male and female Crl:CD(SD) rats for at least four weeks at doses of 60, 200 or 600 mg/kg/day was well tolerated with no
effect of treatment on reproductive performance, including mating performance, fertility and offspring survival and development up to Day 7 of age.
For reproductive/developmental toxicity the no-observed-adverse-effect-level (NOAEL) was considered to be 600 mg/kg/day.

Effect on fertility: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

600 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

The available study was conducted according to OECD test guidelines and in compliance with GLP; it should be noted that this is only a screening study and the results cannot be considered as reliable as those derived through a full reporoductive toxicity study.

Effect on fertility: via inhalation route

Endpoint conclusion:

no study available

Effect on fertility: via dermal route

Endpoint conclusion:

no study available

Effects on developmental toxicity

Effect on developmental toxicity: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

600 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

The available study was conducted according to OECD test guidelines and in compliance with GLP; it should be noted that this is only a screening study and the results cannot be considered as reliable as those derived through a full reporoductive toxicity study.

Effect on developmental toxicity: via inhalation route

Endpoint conclusion:

no study available

Effect on developmental toxicity: via dermal route

Endpoint conclusion:

no study available