Registration Dossier

Administrative data

Endpoint:
chronic toxicity: inhalation
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Cross-reference
Reason / purpose:
data waiving: supporting information
Reference
Endpoint:
sub-chronic toxicity: oral
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
1983
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Justification for type of information:
Refer to section 13 of IUCLID for details on the read-across justification. The study with the read across substance is considered sufficient to fulfil the information requirements as further explained in the provided endpoint summary.
Reason / purpose:
read-across source
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 408 (Repeated Dose 90-Day Oral Toxicity in Rodents)
Deviations:
no
GLP compliance:
yes
Limit test:
no
Species:
rat
Strain:
Sprague-Dawley
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Albino rats CD-Crl: (CD (SD) BR
- Age at study initiation: 6 weeks old
- Weight at study initiation: males 218 - 272 g and females 154 - 190 g
- Fasting period before study: no data
- Housing: individually in stainless steel screen bottom cages
- Diet (e.g. ad libitum): basal diet was ground Purina Certified Rodent Chow 95002
- Water (e.g. ad libitum): ad libitum - partially demineralized by reverse osmosis and sterilized by ultraviolet light
- Acclimation period: 26 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 72 °F +/- 3 °
- Humidity (%): 50 % +/- 2 %
- Air changes (per hr): 10 changes per hour
- Photoperiod (hrs dark / hrs light): 12 hour light/dark cycle
Route of administration:
oral: feed
Vehicle:
other: Purina Certified Rodent Chow 95002
Details on oral exposure:
PREPARATION OF DOSING SOLUTIONS:

DIET PREPARATION
- Rate of preparation of diet (frequency): on a basis of 90 % active ingredient all diets were prepared fresh weekly.
- Mixing appropriate amounts with (Type of food): Purina Certified Rodent Chow 95002
- Storage temperature of food: refrigerated in covered polyethylene containers
Analytical verification of doses or concentrations:
yes
Details on analytical verification of doses or concentrations:
A sample of each diet preparation will be analyzed each week for test substance concentration. If the mean concentration of test substance varied from the theoretical value by more than +/- 20% the test diets will be prepared again. The test substance is extracted with methanol/chloroform and passed through a cation exchange column. The analyt is eluted with 5% HCl in methanol from the column and determined by analyzing by HPLC using a PAC-type column and conductivity detector.
Duration of treatment / exposure:
13 weeks
Frequency of treatment:
The test diet was provided ad libitum, individual food consumption was recorded in g/week
Dose / conc.:
0 mg/kg bw/day (nominal)
Dose / conc.:
10 mg/kg bw/day (nominal)
Dose / conc.:
100 mg/kg bw/day (nominal)
Dose / conc.:
1 000 mg/kg bw/day (nominal)
No. of animals per sex per dose:
20 animals per sex per dose
Control animals:
yes, concurrent no treatment
other: See remarks
Details on study design:
- Dose selection rationale: Not given in study report
- Rationale for animal assignment (if not random): random
- Post-exposure recovery period in satellite groups: no satellite groups for recovery
- Section schedule rationale (if not random): random
Positive control:
No positive control
Observations and examinations performed and frequency:
CAGE SIDE OBSERVATIONS: Yes
- Time schedule: twice daily
- All animals were observed at least twice daily for moribundity, death and obvious indications of a toxic effect. At least once each week each animal was removed from its cage and carefully examined for abnormalities and clinical signs of toxic or pharmacologic effects.

DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: at least once a week

BODY WEIGHT: Yes
- Time schedule for examinations: at initiation and weekly through termination of study

FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study):
- Food consumption for each animal determined and mean daily diet consumption calculated as g food/kg body weight/day: Yes
- Compound intake calculated as time-weighted averages from food consumption and body weight gain data: Yes

FOOD EFFICIENCY:
- Food efficiency was calculated as percentage value.

WATER CONSUMPTION AND COMPOUND INTAKE (if drinking water study): No

OPHTHALMOSCOPIC EXAMINATION: No

Haematology: Yes
- Time schedule for collection of blood: a blood sample was collected from the vena cava during exsanguination and placed into collection tubes.
- Anaesthetic used for blood collection: no
- Animals fasted: no data
- How many animals: all
- Parameters examined: total erythrocyte count,nucleated erythrocyte count, hemoglobin, hematocrit, mean corpuscular volume (MCV),
mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCCH), total leucocytes,
differential leucocyte count (neutrophil, lymphocyte, eosinophil, monocyte, basophil)
immature neutrophils, mature neutrophils

CLINICAL CHEMISTRY: Yes
- Parameters examined in serum:
glucose, blood urea nitrogen, total protein, total bilirubin, serum glutamic-oxaloacetic transaminase SGOT (also known as serum aspartate aminotransferase), serum glutamic-pyruvic transaminase SGPT (also known as serum alanine aminotransferase)
alkaline phosphatase

URINALYSIS: No

NEUROBEHAVIOURAL EXAMINATION: No
Sacrifice and pathology:
All animals were killed within 3 days after completion of the 91-day dosing period. The animals were weighed on the day of necropsy, anesthetized with ether and killed by exsanguination.

GROSS PATHOLOGY: Yes
All animals were examined macroscopically. Relative and absolute organ weights of liver and kidneys were recorded.

HISTOPATHOLOGY: Yes
All tissues were identified only by a random number. The following tissues and organs were examined and preserved in enough 10 % phosphate-buffered formalin to ensure adequate fixation.

Bone marrow, lung, heart, aorta (thoracic), tongue, trachea, esophagus, thyroid, submandibular lymph nodes, lymph nodes (ileocecocolic and
anterior mesenteric), stomach (fundic, cardiac pyloric regions), liver, duodenum, jejunum, ileum, cecum, colon urinary bladder, kidneys (left kidney
longitudinally, right kidney transversely to show cortex medulla and pelvis)
Reproductive organs males: prostate and seminal vesicle, testis with tunic nicked and epididymis attached.
Reproductive organs females: ovaries cross section of both uterine horns cross section of vagina.
Adrenals, thymus, gluteal plus biceps muscle, spleen, pancreas, distal femur (with marrow), brain (incl. cerebrum, mid-brain, cerebellum and stem),
lumbar spinal cord, sciatic nerve, submandibular salivary glands, pituitary gland, eyes (fixed in Zenker´s solution)

Lesions were collected.
Statistics:
The body weights, body weight gains, organ weights, organ weight to terminal body weight ratio, clinical pathology data, bone marrow smear values, and food consumption and efficiency values were statistically analyzed by sex. The statistical evaluation was by analysis of variance techniques. When Bartlett´s test of homogeneity of variance was not significant, treated groups were compared with the control group using the least significant difference (LSD) criterion. When Bartlett´s test was significant, comparisons with this control group were made by t-test and Wilcoxon´s rank sum test. Regression analysis was performed where significant differences between control and treated groups occurred. This analysis included tests for linear regression and lack of fit. All statistical tests where conducted at a 5 % two-sided risk level. Statistical comparisons were not made between sexes or among treated groups within a sex.
Clinical signs:
no effects observed
Mortality:
no mortality observed
Body weight and weight changes:
no effects observed
Food consumption and compound intake (if feeding study):
effects observed, treatment-related
Description (incidence and severity):
Values for females treated with 10 mg/kg bw/day were significantly higher than those of controls during weeks 1-6 and 12. Food consumption values for females treated with 100 mg/kg bw/day were significantly higher during weeks 1-8 and 11-12.
Food efficiency:
effects observed, treatment-related
Description (incidence and severity):
Significantly lower mean values were detected during week 1 for male rats treated with 100 mg/kg bw/day and during weeks 1 and 2 for males treated with 1000 mg/kg bw/day.
Water consumption and compound intake (if drinking water study):
not specified
Ophthalmological findings:
not specified
Haematological findings:
no effects observed
Clinical biochemistry findings:
effects observed, treatment-related
Description (incidence and severity):
Significantly higher mean values for total protein and SGOT in males treated with 10 mg/kg bw/day. A significantly lower value for total protein and significantly higher values for SGOT and SGPT levels were detected in the male 1000 mg/kg bw/day.
Urinalysis findings:
not examined
Behaviour (functional findings):
not examined
Organ weight findings including organ / body weight ratios:
effects observed, treatment-related
Description (incidence and severity):
Significant lower mean absolute and relative liver weights occurred in males treated with 1000 mg/kg bw/day.
Gross pathological findings:
no effects observed
Histopathological findings: non-neoplastic:
no effects observed
Histopathological findings: neoplastic:
no effects observed
Details on results:
CLINICAL SIGNS AND MORTALITY
There were no treatment related clinical signs observed, no animals died or were sacrificed during the study.

BODY WEIGHT AND WEIGHT GAIN
No significant differences in mean body weights or body weight gains were detected.

FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study)
No significant differences were detected for any treated male group when compared with the male control group. Food consumption values for
females treated with 10 mg/kg bw/d were significantly higher than those of controls during weeks 1-6 and 12. Food consumption values for
females treated with 100 mg/kg bw/day were significantly higher during weeks 1-8 and 11-12.

FOOD EFFICIENCY
No significant differences for food efficiencies were detected in female dose groups and the male 10 mg/kg bw/day dose group. Significantly lower mean values were detected during week 1 for male rats treated with 100 mg/kg bw/day and during weeks 1 and 2 for males treated with 1000 mg/kg bw/day.

WATER CONSUMPTION AND COMPOUND INTAKE (if drinking water study)
No data

OPHTHALMOSCOPIC EXAMINATION
No data

HAEMATOLOGY
There were no significant differences between treated groups and controls.

CLINICAL CHEMISTRY
There were no significant differences detected for males treated with 100 mg/kg bw/day or females of all dose groups. Significantly higher mean values for total protein and SGOT were detected in males treated with 10 mg/kg bw/day. A significantly lower value for total protein and significantly higher values for SGOT and SGPT levels were detected in the male 1000 mg/kg bw/day group.

URINALYSIS
No data

NEUROBEHAVIOUR
No data

ORGAN WEIGHTS
No significant differences were detected in absolute or relative organ weights for males treated with 10 or 100 mg/kg bw/day and females of all dose groups.
Significant lower mean absolute and relative liver weights occurred in males treated with 1000 mg/kg bw/day.


GROSS PATHOLOGY:
All findings were considered incidential and not treatment related.

HISTOPATHOLOGY: NON-NEOPLASTIC
All observations were considered incidential and not treatment related. Liver lesions in 1000 mg/kg bw/day males, which would correlate with the differences in chemistries and organ weights were not found at the light microscopic level.

HISTOPATHOLOGY: NEOPLASTIC (if applicable)
No neoplastic lesions are described in the study report.
Key result
Dose descriptor:
NOEL
Effect level:
100 mg/kg bw/day (nominal)
Based on:
act. ingr.
Sex:
male/female
Basis for effect level:
other: Reduced liver weight and minor serum enzymes changes in males at 1000 mg/kg bw/day.
Key result
Dose descriptor:
NOAEL
Effect level:
300 mg/kg bw/day (nominal)
Based on:
act. ingr.
Sex:
male/female
Basis for effect level:
other: See remarks
Key result
Critical effects observed:
not specified
Conclusions:
Under the study conditions, NOAEL for the repeated dose oral 90 d study for the test substance was determined to be 300 mg/kg bw/day.
Executive summary:

A 90-d study was conducted determine the sub-chronic toxicity potential of the read across substance, 'di-C16-18 and C18 -unsatd. AAEMIM-MS', according to a method similar toOECD Guideline 408, in compliance with GLP. The test substance was administered to 20 Sprague-Dawley rats/sex/dose by oral feed at dose levels of 0, 10, 100 and 1000 mg/kg bw/day (active ingredient). No satellite group was included to assess the reversibility of any potentially adverse effects. The active ingredient in diet was analysed in all preparations and actual test material consumption closely resembled theoretical values (males 94 to 95% and females 86 to 93%). There were no treatment related clinical signs observed, no animal died or was sacrificed during the study. Body weights and weight gains were in a normal range. No significant differences in food consumption were detected for any treated male group. Food consumption in the 10 and 100 mg/kg bw/day female groups were significantly increased during some weeks during the study. There were no consistent differences in food efficiencies. Decreased values of absolute and relative liver weights in the male high dose group were probably treatment related and were accompanied by lower total serum protein and higher SGPT and SGOT concentrations for this treatment level. Correlating microscopic lesions were not detected. A dose dependency for these effects was not found. No other treatment related effects on organ weights, haematological or clinical chemistry parameters were observed. All macroscopic observations and microscopic lesions were considered incidental and not treatment related. Microscopic examinations revealed no treatment related changes. The histological examination of the reproductive organs (testes, epididymis, prostate, seminal vesicle, ovary, uterus and vagina) did not reveal any treatment related abnormalities. A pretest health examination, conducted on 10 animals/sex, showed five animals with positive background endoparasites or viral titres. The NOEL was 100 mg/kg bw/day. The study suffers, however, from the excessively wide dose spacing, which would not be the standard for present day testing protocols. Considering the overall toxicological profile, there is no evidence for a potential serious health risk for humans upon ingestion of members of this chemical structure family. As a consequence, the reported NOEL has been recalculated for the derivation of an acceptable DNEL long-term oral, departing from the highest dose as the LOAEL to arrive at a realistic basis for DNEL derivations, resulting in the recalculated NOAEL of 300 mg/kg bw/day. Under the study conditions, NOAEL for the repeated dose oral 90-d study for the read across substance was determined to be 300 mg/kg bw/day (Wayne, 1983). Based on the results of the read across study, similar NOAEL can be considered for the test substance, 'di-C18-22 AAEMIM-MS' following repeated exposure.

Data source

Materials and methods

Results and discussion

Applicant's summary and conclusion