Glycerol monomyristate

Endpoint summary

Key value for chemical safety assessment

Effects on fertility

Description of key information

Oral: OECD 422, rat, NOAEL fertility = 1000 mg/kg bw/day

Oral: OECD 422, rat, NOAEL systemic = 1000 mg/kg bw/day

Link to relevant study records

Reference

Reference 1

Endpoint:

screening for reproductive / developmental toxicity

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP-Guideline study.

Qualifier:

according to guideline

Guideline:

OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)

Deviations:

no

GLP compliance:

yes

Limit test:

no

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Laboratories Japan, Inc., Yokohama, Japan
- Age at study initiation: 10 weeks
- Weight at study initiation: 352 - 426 g (males; mean: 372 g), 192 - 249 g (females; mean: 224 g)
- Housing: individual in stainless steel cages
- Diet: ad libtum
- Water: ad libitum
- Acclimation period: 11 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22.1 - 23.2
- Humidity (%): 48 - 61
- Air changes (per hr): more than 10
- Photoperiod (hrs dark / hrs light): 12/12

Route of administration:

oral: gavage

Vehicle:

corn oil

Details on exposure:

PREPARATION OF DOSING SOLUTIONS:
The test substance was diluted in appropritate amounts of corn oil for each dose level. Aliquots of the dosing solution corresponding to the amount of daily administration were stored in the dark at 2 - 6 °C. The stability of the dosing solution was 7 days in a refrigerator and 1 day at room temperature. Therefore, the dosing solution was used within 7 days.

VEHICLE
- Justification for use and choice of vehicle (if other than water): the test substance showed low solubility in water.
- Amount of vehicle (if gavage): 5 mL/kg
- Lot/batch no. (if required): V4N3566

Details on mating procedure:

- M/F ratio per cage: 1/1
- Length of cohabitation: up to 14 days
- Proof of pregnancy: vaginal plug / sperm in vaginal smear referred to as day 0 of pregnancy
- After successful mating each pregnant female was caged: individually in a polycarbonate cage with animal bedding for nesting

Analytical verification of doses or concentrations:

yes

Details on analytical verification of doses or concentrations:

No details reported.

Duration of treatment / exposure:

males: 42 days (14 days prior to mating and 28 days thereafter)
females: 42-52 days (from 14 days before mating to day 4 of lactation)
satellite males and females: 42 days and 14 days post-exposure observation period

Frequency of treatment:

once daily, 7 days/week

Details on study schedule:

- Age at mating of the mated animals in the study: 12 weeks

Remarks:

Doses / Concentrations:
100, 300 and 1000 mg/kg bw/day
Basis:
actual ingested

No. of animals per sex per dose:

12 females in control and test groups
7 males in control and 1000 mg/kg bw groups
12 males in 100 and 300 mg/kg bw groups
5 animals per sex in satellite control and test groups

Control animals:

yes, concurrent vehicle

Details on study design:

- Dose selection rationale:
Two dose range finding studies were performed. 2000 mg/kg bw of test substance was administered for 3 days in male and female rats. No abnormalities were found in general condition and body weight. The second study was performed at dose levels of 0, 330, 100, 300 and 1000 mg/kg bw/day for 14 days. No abnormalities of general condition, body weight, food consumption, hematological findings, blood biochemical findings, gross pathology and organ weight were found. Therefore, 1000 mg/kg bw/day was selected as the highest dose.
- Post-exposure recovery period in satellite groups: 14 days

Parental animals: Observations and examinations:

CAGE SIDE OBSERVATIONS: Yes
- Time schedule: twice daily

DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: once prior to the first exposure and weekly thereafter

BODY WEIGHT: Yes
- Time schedule for examinations:
Males: Day 1 (before administration), 7, 14, 21, 28, 35 and 42 (before sacrifice)
Females: Day 1 (before administration), 7, 14, during pregnancy on Day 0, 7 14 and 21, during lactation on Days 0 and 4 (before sacrifice)
Satellite males and females: Day 1 (before administration), 7, 14, 21, 28, 35, 42, 49 (Day 7 of recovery period) and 56 (Day 14 of recovery period, before sacrifice)

FOOD CONSUMPTION:
- Food consumption for each animal determined and mean daily diet consumption calculated as g food/kg body weight/day: Yes

Oestrous cyclicity (parental animals):

Numbers of times in estrous before and during administration till mating confirmed.

Sperm parameters (parental animals):

Parameters examined in P male parental generations:
testis weight and abnormality, epididymis weight and abnormality, prostate weight and abnormality

Litter observations:

PARAMETERS EXAMINED
The following parameters were examined in F1 offspring:
number and sex of pups, stillbirths, live births, postnatal mortality, presence of gross anomalies, body weight, physical abnormalities

GROSS EXAMINATION OF DEAD PUPS:
yes, for external and internal abnormalities; possible cause of death was determined for pups born or found dead.

Postmortem examinations (parental animals):

SACRIFICE
- Male animals: All surviving animals one day after the last administration (Day 43)
- Maternal animals: All surviving animals on Day 5 of lactation

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

HISTOPATHOLOGY / ORGAN WEIGHTS
The following tissues were prepared for microscopic examination and weighed, respectively:
brain, pituitary, thyroid, thymus, lung trachea (after liquid immersion fixation), stomach, intestines, heart, liver, spleen, kidney, adrenal gland, bladder, testis, epididymis, prostate, seminal vesicles, ovaries, uterus, spinal cord (cervical, thoracic, lumbar), sciatic nerve, bone marrow (femur), lymph nodes (cervical lymph node, mesenteric lymph nodes), mammary gland, and other gross abnormalities.
Spermatogenic cycle (Stage II, III, V, VII, and XII) was also investigated.

Postmortem examinations (offspring):

SACRIFICE
- The F1 offspring were sacrificed at 4 days of age.
- These animals were subjected to postmortem examinations (macroscopic).

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

Statistics:

ANOVA, Barlettm Kruskal-Willis, Dunnett, F test, Studen t-test, Aspin-Welch t-test, Mann-Whitney U-test, Fisher's exact test

Reproductive indices:

Copulation index = (No. of pairs with successful copulation/No. of pairs mated) x 100
Fertility index = (No. of pregnant females/No. of pairs with successful copulation) x 100
Gestation index = (No. of females with live pups / No. of pregnant females) x 100

Offspring viability indices:

Delivery index = (No. of pups born / No. of implantation sites) x 100
Live birth index = (No. of live pups on day 0 / No. of pups born) x 100
Viability index = (No. of live pups on day 4 / No. of live pups on day 0) x 100
Sex ratio = total No. of male pups / total No. of female pups

Clinical signs:

no effects observed

Body weight and weight changes:

effects observed, treatment-related

Description (incidence and severity):

1000 mg/kg bw/day (satellite group, males): significant increase was observed (non adverse)

Food consumption and compound intake (if feeding study):

effects observed, treatment-related

Description (incidence and severity):

1000 mg/kg bw/day (satellite group, males): significant increase was observed (non adverse)

Organ weight findings including organ / body weight ratios:

effects observed, treatment-related

Histopathological findings: non-neoplastic:

effects observed, treatment-related

Description (incidence and severity):

control and 1000 mg/kg bw/day: low incidence of commonly found microscopic changes, evenly distributed between groups (not treatment-related);300 mg/kg bw/day: benign fibroadenoma of the mammary gland in one female (not treatment-related)

Other effects:

not examined

Reproductive function: oestrous cycle:

no effects observed

Reproductive function: sperm measures:

no effects observed

Reproductive performance:

no effects observed

CLINICAL SIGNS AND MORTALITY (PARENTAL ANIMALS)
No abnormalities and no mortality were observed.

BODY WEIGHT AND FOOD CONSUMPTION (PARENTAL ANIMALS)
No change of body weight and weight gain was observed during the administration period. During the recovery period, a significant increase in body weight was noted in males at 1000 mg/kg bw/day. This was caused by a tendency of the control group animals to lose weight. One male in control group showed a significant decrease in body weight during the recovery period. However, no other abnormalities were observed in this male.
No change was observed during the administration period in the test groups. A significant increase in food consumption was found in satellite females of the 1000 mg/kg bw/day group on Day 14 of administration. However, it was regarded as an incidental finding since the food consumption of the corresponding control group was relatively small on that day. Therefore, this change was not regarded as a compound-related effect.

REPRODUCTIVE FUNCTION: ESTROUS CYCLE (PARENTAL ANIMALS)
No differences were observed between control group and test groups.

REPRODUCTIVE FUNCTION: SPERM MEASURES (PARENTAL ANIMALS)
Decreased sperm was observed in one male in control group and whose pair was not pregnant.

REPRODUCTIVE PERFORMANCE (PARENTAL ANIMALS)
No changes were observed both in control and test groups.

ORGAN WEIGHTS (PARENTAL ANIMALS)
After the administration period, a significant decrease in the absolute weight of seminal vesicles in males given and a significant decrease in relative weight of spleen in females were observed in the 100 mg/kg bw/day group. However, this change was not compound-related because no abnormalities were found at histopathological examination and there was no dose-dependency.
After the recovery period, a significant decrease in relative weight of pituitary in males of the 1000 mg/kg bw/day group and relative weight of thyroid in females of the 1000 mg/kg group bw/day was observed. Nevertheless, this effect was not compound-related because no abnormality was reported regarding these organs after administration period.

GROSS PATHOLOGY (PARENTAL ANIMALS)
No test substance-related changes were found. No abnormalities were found in breeding pairs which were not successful at mating and in those which were successful at mating but not pregnant.
After administration period, reddish thymus was noted in one male of the control group and subcutis mass was found in one female of 300 mg/kg by/day group (see also HISTOPATHOLOGY: NEOPLASTIC). After the recovery period, larger spleen and capsular thickening in spleen was found in one male and reddish area in thymus was observed in one female at 1000 mg/kg bw/day.

HISTOPATHOLOGY (PARENTAL ANIMALS)
No test substance-related changes were observed. There were also no changes regarding spermatogenic cycle.
Myocardial degeneration/fibrosis, foam cell accumulation in lung, mineralization in artery in lung, fatty degeneration of hepatocyte, microgranuloma in liver, solitary cyst in kidney, hyaline cast in kidney, lymphocyte infiltration in cortex of kidney, mineralization of cortico-medullary junction in kidney, fibrosis of cortex in kidney and haemorrhage in thymus were observed both in the control and 1000 mg/kg bw/day groups or only in the control group with low incidence. Hyaline droplet of proximal tubular epithelium in kidney was found in all males of the control and 1000 mg/kg bw/day groups. Brown deposit pigment and extramedullary haematopoiesis in spleen were found in all males and females of the control and 1000 mg/kg bw/day groups. However, there were no differences between control and test group. In the 1000 mg/kg bw/group, lymphocyte interstitium infiltration in prostate was found in one male, interstitial focal inflammation in lung and focal necrosis in liver was observed in one female. These changes occur naturally and were not compound-related.
No abnormalities were found in uterus and ovary in the non-pregnant females and the unsuccessful copulation females of the control and 1000 mg/kg bw/day groups, respectively. Degeneration of seminiferous tubules of testis, decrease in sperm and atrophy in prostate was observed in one control male.
Mass on abdomen was found in a female after 40 days of administration in the 300 mg/kg bw/day group. However, this subcutaneous tumour of the mammary gland was a benign fibroadenoma and generated naturally.

Key result

Dose descriptor:

NOAEL

Remarks:

systemic

Effect level:

1 000 mg/kg bw/day (actual dose received)

Based on:

test mat.

Sex:

male/female

Basis for effect level:

other: overall effects

Key result

Dose descriptor:

NOAEL

Remarks:

fertility

Effect level:

1 000 mg/kg bw/day (actual dose received)

Based on:

test mat.

Sex:

male/female

Basis for effect level:

other: overall effects

Clinical signs:

no effects observed

Mortality / viability:

no mortality observed

Body weight and weight changes:

no effects observed

Sexual maturation:

not examined

Organ weight findings including organ / body weight ratios:

not examined

Gross pathological findings:

effects observed, treatment-related

Description (incidence and severity):

control and test groups: low incidence of commonly found visceral variations (not compound-related)

Histopathological findings:

not examined

VIABILITY (OFFSPRING)
No changes were observed.

CLINICAL SIGNS (OFFSPRING)
No effects were observed.

GROSS PATHOLOGY (OFFSPRING)
Thymic remnant in neck was observed in one, one and two pups in the control, 300 and 100 mg/kg bw/day groups, respectively. Persistent left umbilical artery was found in one and two pups at 100 and 1000 mg/kg bw/day, respectively. Convoluted ureter was found in one, three and two pups at 100, 300 and 1000 mg/kg bw/day, respectively. Dilatation of renal pelvis was observed in one pup at 300 mg/kg bw/day. Dilatation of ureter was observed in one and two pups in 100 and 300 mg/kg bw/day, respectively. However, these changes were regarded as not-compound related, since they could occur naturally and there was no significant difference between control and test groups.

Key result

Dose descriptor:

NOAEL

Remarks:

development

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: overall effects

Reproductive effects observed:

not specified

Reference 2

Endpoint:

screening for reproductive / developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

17 Feb - 07 April 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP-Guideline study.

Qualifier:

according to guideline

Guideline:

OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)

Deviations:

no

GLP compliance:

yes

Limit test:

no

Species:

rat

Strain:

other: Crl:WI(Han) (outbred, SPF-Quality)

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Laboratories France, L'Arbresle Cedex, France
- Age at study initiation: approximately 12 weeks
- Weight at study initiation: 277-353 g (males), 180-228 g (females)
- Housing : 5 animals/sex/cage in Macrolon cages (MIV type, height 18 cm). This was also applicable for Main females and Recovery animals throughout the complete treatment period. Sterilised sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France) and paper as cage-enrichment (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom) were supplied.
- Diet: pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany), ad libitum
- Water: tap-water, ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21 ± 3 (actual range: 19.7-21.9)
- Humidity (%): 40-70 (actual range: 22-71)
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12/12

This species and strain of rat has been recognized as appropriate for general and reproduction toxicity studies. The testing laboratory has general and reproduction/developmental historical data in this species from the same strain and source. This animal model has been proven to be susceptible to the effects of reproductive toxicants.

Route of administration:

oral: gavage

Vehicle:

polyethylene glycol

Details on exposure:

PREPARATION OF DOSING SOLUTIONS:
Formulations (w/w) were prepared daily within 6h prior to dosing and were homogenized to a visually acceptable level.
Adjustment was made for the density of the test substance (0.944), and the specific gravity of the vehicle (1.125).

VEHICLE
- Justification for use and choice of vehicle (if other than water): Based on trial formulations performed at the testing laboratory.
- Purity: polyethylene glycol 400, specific gravity 1.125 (Merck, Darmstadt, Germany)

Dose volume: 5 mL/kg bw

Details on mating procedure:

- M/F ratio per cage: 1/1
- Length of cohabitation: max. 14 days
- Proof of pregnancy: evidence of sperm in the vaginal lavage, by staging of the estrous cycle and/or by the appearance of an intravaginal copulatory plug referred to as Day 0 of pregnancy
- After successful mating each pregnant female was caged individually in Macrolon cages (MIII type).

Following a minimum of 14 days of exposure for the males and females, one Repro female was cohabitated with one Main male of the same treatment group, avoiding sibling mating (Charles River supplied non-litter mates). Detection of mating was not confirmed for animal no. 98 which did deliver. The mating date of this animal was estimated at 21 days prior to the actual delivery date. This day was designated Day 0 post-coitum. Once mating had occurred, the males and females were separated. A maximum of 14 days was allowed for mating. After 14 days of mating, females who had not shown evidence of mating were separated from their males.

Analytical verification of doses or concentrations:

yes

Details on analytical verification of doses or concentrations:

Chemical analyses of formulations were conducted once during the study to assess accuracy, homogeneity and stability. Samples of formulations were analysed for homogeneity (highest and lowest concentration) and accuracy of preparation (all concentrations). Stability in vehicle over 6h at room temperature was also determined (highest and lowest concentration).
The accuracy of preparation was considered acceptable if the mean measured concentrations were 85-115% for suspensions. Homogeneity was demonstrated if the coefficient of variation was ≤10%. Formulations were considered stable if the relative difference before and after storage was maximally 10%.
The concentrations analysed in the formulations of Group 2, Group 3 and Group 4 were in agreement with target concentrations (i.e. mean accuracies between 85% and 115%). The formulations of Group 2 and Group 4 were homogeneous (i.e. coefficient of variation ≤10%) and formulations at the entire range were stable when stored at room temperature for at least 6h.

Duration of treatment / exposure:

41-49 days,
i.e. during 2 weeks prior to mating, during mating, during post-coitum, and during at least 4 days of lactation.

Frequency of treatment:

daily, 7 days/week

Details on study schedule:

Offspring were euthanized at the age of 4 days.

Remarks:

Doses / Concentrations:
100, 300 and 1000 mg/kg bw/day
Basis:
actual ingested

No. of animals per sex per dose:

10

Control animals:

yes, concurrent vehicle

Details on study design:

- Dose selection rationale: Based on the results of a 10-day dose range finding study

Parental animals: Observations and examinations:

Male number paired with, mating date, confirmation of pregnancy, and delivery day were recorded.
Pregnant females were examined to detect signs of difficult or prolonged parturition, and cage debris of these females was examined to detect signs of abortion or premature birth. Any deficiencies in maternal care (such as inadequate construction or cleaning of the nest, pups left scattered and cold, physical abuse of pups or apparently inadequate lactation or feeding) were examined.

CAGE SIDE OBSERVATIONS: Yes

DETAILED CLINICAL OBSERVATIONS: Yes:

BODY WEIGHT: Yes

FOOD CONSUMPTION AND COMPOUND: Yes

for further details see Section 7.5.1

Oestrous cyclicity (parental animals):

Uterus epithelium was analysed histologically for estrus, proestrus and cystic endometrial glands.

Sperm parameters (parental animals):

Parameters examined in [all/P/F1/F2] male parental generations: testis weight, epididymis weight, histology of testes
Of the first 5 Main males of the control and high dose group, additional slides of the testes were prepared to examine staging of spermatogenesis.
The testes were processed, sectioned at 3-4 micrometers, and stained with PAS/haematoxylin.

Litter observations:

On Day 1 of lactation, all pups were randomized per litter and individually identified by means of subcutaneous injection of Indian ink.
Each litter was examined to determine the following, if practically possible:
Mortality / Viability: The numbers of live and dead pups on Day 1 of lactation and daily thereafter were determined. If possible, defects or cause of death were evaluated.
Clinical signs: At least once daily, detailed clinical observations were made in all animals.
Body weights: Live pups were weighed on Days 1 and 4 of lactation.
Sex: Sex was determined for all pups on Days 1 and 4 of lactation.

Postmortem examinations (parental animals):

SACRIFICE
- Maternal animals which delivered: on lactation Day 5
- Maternal animals which failed to deliver (4 animals): Post-coitum Day 26 (females with evidence of mating) or approximately 21 days after the last day of the mating period (females without evidence of mating).

GROSS NECROPSY
- Gross necropsy consisted of: see details under 7.5.1
The numbers of former implantation sites and corpora lutea were recorded for all paired females.

HISTOPATHOLOGY / ORGAN WEIGHTS
see details under 7.5.1

Postmortem examinations (offspring):

SACRIFICE
- Pups surviving to planned termination were killed by decapitation on lactation Day 5.

All pups were sexed and descriptions of all external abnormalities were recorded. The stomach was examined for the presence of milk. If possible, defects or cause of death were evaluated. Any abnormal pup, organ or tissue as well as pups from females that were killed in extremis were preserved in 10% buffered formalin for possible further examination.

Statistics:

See Section 7.5.1

Reproductive indices:

For each group the following calculations were performed:
- Mating (%): Number of females mated/Number of females paired x 100
- Fertility index (%): Number of pregnant females/Number of females paired x 100
- Conception index (%): Number of pregnant females/Number of females mated x 100
- Gestation index (%): Number of females bearing live pups/Number of pregnant females x 100
- Duration of gestation: Number of days between confirmation of mating and the beginning of parturition
- Percentage live males at First Litter Check: Number of live male pups at First Litter Check/ Number of live pups at First Litter Check x 100
- Percentage live females at First Litter Check: Number of live female pups at First Litter Check/Number of live pups at First Litter Check x 100
- Percentage of postnatal loss Days 0-4 of lactation: Number of dead pups on Day 4 of lactation/Number of live pups at First Litter Check x 100
- Viability index (%): Number of live pups on Day 4 of lactation/Number of pups born alive x 100

Offspring viability indices:

For each group the following calculations were performed:
- Percentage live males at First Litter Check: Number of live male pups at First Litter Check/ Number of live pups at First Litter Check x 100
- Percentage live females at First Litter Check: Number of live female pups at First Litter Check/Number of live pups at First Litter Check x 100
- Percentage of postnatal loss Days 0-4 of lactation: Number of dead pups on Day 4 of lactation/Number of live pups at First Litter Check x 100
- Viability index (%): Number of live pups on Day 4 of lactation/Number of pups born alive x 100

Clinical signs:

no effects observed

Body weight and weight changes:

no effects observed

Food consumption and compound intake (if feeding study):

no effects observed

Organ weight findings including organ / body weight ratios:

no effects observed

Histopathological findings: non-neoplastic:

no effects observed

Other effects:

not specified

Reproductive function: oestrous cycle:

no effects observed

Description (incidence and severity):

as found by histological examination of uterus

Reproductive function: sperm measures:

no effects observed

Description (incidence and severity):

as found by histological examination of testes

Reproductive performance:

no effects observed

REPRODUCTIVE FUNCTION: SPERM MEASURES (PARENTAL ANIMALS)
The assessment of the integrity of the spermatogenetic cycle did not provide any evidence of impaired spermatogenesis, as explored by histological examination of testes.

REPRODUCTIVE FUNCTION: ESTROUS CYCLE (PARENTAL ANIMALS)
Histological examination of the uterus epithelium and endometrial glands did not reveal any treatment related influences on estrous cycle.

REPRODUCTIVE PERFORMANCE (PARENTAL ANIMALS)
No treatment related effects on reproductive parameters were noted.
The mating, fertility and conception indices, precoital time, and number of corpora lutea and implantation sites were unaffected by treatment.

ORGAN WEIGHTS (PARENTAL ANIMALS)
No treatment-related effects observed.

GROSS PATHOLOGY (PARENTAL ANIMALS)
No treatment-related effects observed.

HISTOPATHOLOGY (PARENTAL ANIMALS)
No treatment-related effects observed.

For further details see 7.5.1

Key result

Dose descriptor:

NOAEL

Remarks:

parental fertility

Effect level:

1 000 mg/kg bw/day (actual dose received)

Based on:

test mat.

Sex:

male/female

Basis for effect level:

other: see 'Remark'

Clinical signs:

no effects observed

Mortality / viability:

no mortality observed

Body weight and weight changes:

no effects observed

Sexual maturation:

not examined

Organ weight findings including organ / body weight ratios:

not examined

Gross pathological findings:

no effects observed

Histopathological findings:

no effects observed

Number of pups: 432
No toxicologically relevant effects on gestation index and duration, parturition, maternal care and early postnatal pup development (mortality, clinical signs, body weight and macroscopy) were observed.

Key result

Dose descriptor:

NOAEL

Remarks:

developmental

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 and treatment-related effects were observed up to and including the highest tested dose level

Reproductive effects observed:

not specified

Effect on fertility: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

1 000 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

The available information comprises an adequate and reliable studies (Klimisch score 1) from reference substances with similar structure and intrinsic properties. Read-across is justified based on structural similarity and consistent trends in environmental fate, ecotoxicological and toxicological profile (refer to endpoint discussion for further details). The selected studies are thus sufficient to fulfil the standard information requirements set out in Annex VIII, 8.7, in accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006.

Effect on fertility: via inhalation route

Endpoint conclusion:

no study available

Effect on fertility: via dermal route

Endpoint conclusion:

no study available

Additional information

Justification for read-across

No data on the reproduction toxicity of Glycerol monomyristate (CAS 27214 -38 -6) are available. The assessment was therefore based on studies conducted with analogue substances as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. For each specific endpoint the source substance(s) structurally closest to the target substance is/are chosen for read-across, with due regard to the requirements of adequacy and reliability of the available data. Structural similarities and similarities in properties and/or activities of the source and target substance are the basis of read-across. A detailed justification for the read across approach is provided in the technical dossier (see IUCLID Section 13).

 

CAS 91052-13-0

A combined repeated dose toxicity study with the reproduction / developmental toxicity screening test was performed according to OECD guideline 422 and under GLP conditions in Crl:WI(Han) Wistar rats receiving 100, 300 and 1000 mg/kg bw/day by gavage (please refer to IUCLID section 7.5.1). Dilutions of the test substance in polyethylene glycol or the vehicle alone were administered once daily to groups of 10 male and 5 female rats (main groups) via gavage. In addition, satellite groups of 5 males and 5 females (recovery animals) each for the control and high dose group were used to investigate the reversibility of effects during a 14-day post-exposure recovery period. Furthermore, 10 females (repro animals) were added to each group for the assessment of reproduction and developmental toxicity. The main and recovery groups were exposed for at least 28 days from start of treatment up to termination or start of recovery. Females used for the assessment of reproduction/developmental toxicity were exposed for 41-49 days (during 2 weeks prior to mating, during mating, during post-coitum, and during at least 4 days of lactation). In parental animals, no effects on reproductive function (spermatogenetic and oestrus cycle) or performance (mating, fertility and conception indices; precoital time; number of corpora lutea and implantation sites) were observed after treatment compared with the control animals. The maternal care level was comparable in all groups. The testis weight, epididymis weight, and histological examination of the testes in males as well as the histological examination of the uterus epithelium in females did not reveal any substance-related effects in the parental animals. Therefore, a NOAEL for parental fertility of ≥1000 mg/kg bw/day was derived for male and female rats.

CAS 111-03-5

A GLP-compliant combined repeated dose toxicity study with the reproduction / developmental toxicity screening test was performed according to OECD 422 with 2,3-dihydroxypropyl oleate at dose levels of 100, 300 and 1000 mg/kg bw/day (please refer to IUCLID section 7.5.1). Male and female Sprague Dawley rats (12 per sex and group, except for 1000 mg/kg bw/day: 7 males and 12 females) received the test substance in corn oil once daily via gavage. A control group, consisting of 7 males and 12 females, was treated with the vehicle alone. The duration of treatment was 42 days (14 days prior to mating and 28 days thereafter) in males and 42-52 days (from 14 days before mating to day 4 of lactation) in females, respectively. Satellite groups of 5 animals per sex, each for the control and test groups, were used to investigate reversibility of effects during a 14-day post-exposure recovery period. In parental animals, no difference in reproductive function (spermatogenetic and oestrus cycle) was observed compared to controls. Reproductive performance (copulation, fertility, gestation indices) in treated animals was comparable to controls. No substance-related changes in organ weights and histopathology of reproductive organs in males and females were observed. Based on the results of the study, the NOAEL for reproductive toxicity in male and female Sprague Dawley rats is ≥ 1000 mg/kg bw/day.

 

Overall conclusion for toxicity to reproduction

There are no available studies on the toxicity to reproduction of Glycerol monomyristate (CAS 27214 -38 -6). Therefore analogue read across from 2 source substances was applied. No effects on reproductive parameters/organs were observed in the available screening studies. NOAEL values for reproduction toxicity were all at or above the currently applied limit dose of 1000 mg/kg bw/day. Therefore, no hazard to reproduction was identified. Based on the available data and following the analogue approach, Glycerol monomyristate is not expected to be toxic to reproduction/fertility.

Effects on developmental toxicity

Description of key information

Oral: OECD 422, rat, NOAEL development = 1000 mg/kg bw/day

Effect on developmental toxicity: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

1 000 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

The available information comprises an adequate and reliable studies (Klimisch score 1) from reference substances with similar structure and intrinsic properties. Read-across is justified based on structural similarity and consistent trends in environmental fate, ecotoxicological and toxicological profile (refer to endpoint discussion for further details). The selected studies are thus sufficient to fulfil the standard information requirements set out in Annex VIII, 8.7, in accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006.

Effect on developmental toxicity: via inhalation route

Endpoint conclusion:

no study available

Effect on developmental toxicity: via dermal route

Endpoint conclusion:

no study available

Additional information

Justification for read-across

No data on the developmental toxicity/teratogenicity of Glycerol monomyristate (CAS 27214 -38 -6) are available. The assessment was therefore based on studies conducted with analogue substances as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. For each specific endpoint the source substance(s) structurally closest to the target substance is/are chosen for read-across, with due regard to the requirements of adequacy and reliability of the available data. Structural similarities and similarities in properties and/or activities of the source and target substance are the basis of read-across. A detailed justification for the read across approach is provided in the technical dossier (see IUCLID Section 13).

CAS 91052-13-0

A combined repeated dose toxicity study with the reproduction / developmental toxicity screening test was performed according to OECD guideline 422 and under GLP conditions in Crl:WI(Han) Wistar rats receiving 100, 300 and 1000 mg/kg bw/day (refer to IUCLID section 7.8.1). Dilutions of the test substance in polyethylene glycol or the vehicle alone were administered once daily to groups of 10 male and 5 female rats (main groups) and 10 females (for the assessment of reproduction and developmental toxicity) via gavage. In addition, satellite groups of 5 males and 5 females (recovery animals) each for the control and high dose group were used to investigate the reversibility of effects during a 14-day post-exposure recovery period. The main and recovery groups were exposed for at least 28 days. Females used for the assessment of reproduction/developmental toxicity were exposed for 41-49 days (during 2 weeks prior to mating, during mating, during post-coitum, and during at least 4 days of lactation). Limited developmental data is assessed in the study, as pups are observed until Day 4 post-parturition. No toxicologically relevant changes in the offspring viability and post-natal loss were observed. The sex ratio, body weight, clinical signs observed and prevalence of external gross abnormalities were comparable between the treatment and control groups. Based on the results of the study, the NOAEL for developmental toxicity in offspring is ≥ 1000 mg/kg bw/day.

CAS 111-03-5

A GLP-compliant combined repeated dose toxicity study with the reproduction / developmental toxicity screening test was performed according to OECD 422 with 2,3-dihydroxypropyl oleate at dose levels of 100, 300 and 1000 mg/kg bw/day (refer to IUCLID section 7.8.1). Male and female Sprague Dawley rats (12 per sex and group, except for 1000 mg/kg bw/day: 7 males and 12 females) received the test substance in corn oil once daily via gavage. A control group, consisting of 7 males and 12 females, was treated with the vehicle alone. The duration of treatment was 42 days (14 days prior to mating and 28 days thereafter) in males and 42-52 days (from 14 days before mating to day 4 of lactation) in females, respectively. Satellite groups of 5 animals per sex, each for the control and test groups, were used to investigate reversibility of effects during a 14-day post-exposure recovery period. In offspring, the viability (delivery live birth, post-natal loss indices) in pups of treated dams were comparable to controls. The sex ratio, body weight, clinical signs observed and prevalence of external gross abnormalities were comparable between the treatment and control groups. Based on the results of the study, the NOAEL for developmental toxicity in offspring is ≥ 1000 mg/kg bw/day.

Overall conclusion for developmental toxicity/teratogenicity

There are no available studies on the developmental toxicity and teratogenicity of Glycerol monomyristate (CAS 27214 -38 -6). Therefore analogue read across from 2 source substances was applied from combined repeated dose toxicity studies with reproduction / developmental toxicity screening tests. No hazard to development was identified. Based on the available data and following the analogue approach, the target substance Glycerol monomyristate (CAS 27214 -38 -6) is not expected to be hazardous for in utero development.

 

Justification for classification or non-classification

According to Article 13 of Regulation (EC) No. 1907/2006 "General Requirements for Generation of Information on Intrinsic Properties of substances", information on intrinsic properties of substances may be generated by means other than tests e.g. from information from structurally related substances (grouping or read-across), provided that conditions set out in Annex XI are met. Annex XI, "General rules for adaptation of this standard testing regime set out in Annexes VII to X” states that "substances whose physicochemical, toxicological and ecotoxicological properties are likely to be similar or follow a regular pattern as a result of structural similarity may be considered as a group, or ‘category’ of substances. This avoids the need to test every substance for every endpoint". Since the analogue concept is applied to Glycerol monomyristate, data will be generated from data available for reference source substance(s) to avoid unnecessary animal testing. Additionally, once the analogue read-across concept is applied, substances will be classified and labelled on this basis.

The available data on toxicity to reproduction do not meet the classification criteria according to Regulation (EC) 1272/2008, and are therefore conclusive but not sufficient for classification.