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Diss Factsheets

Administrative data

Endpoint:
developmental toxicity
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Principles of method if other than guideline:
The influence of Bayscript Blaukomponente MDA on embryo-fetal survival and development was assessed in the Han Wistar rat, when administered during the organogenesis and fetal growth phases of pregnancy (Days 6-19 after mating).
Three groups of 22 females received Bayscript Blaukomponente MDA at doses of 100, 330 or 1000 mg/kg/day by oral gavage administration, from Day 6 to 19 after mating. A similarly constituted control group received the vehicle, purified water, at the same volume dose as the treated groups. Animals were killed on Day 20 after mating for reproductive assessment and fetal examination.
Clinical observations, body weight and food consumption were recorded. Adult females were examined macroscopically at necropsy on Day 20 after mating, kidney weights and the gravid uterus weights were recorded. All fetuses were examined macroscopically at necropsy and subsequently by detailed internal visceral examination or skeletal examination, including cartilaginous examination.
GLP compliance:
yes
Limit test:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Reaction mass of lithium sodium 5-amino-3-{[4-(2-{4-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)diazenyl]-2-sulfophenyl}vinyl)-3-sulfophenyl]diazenyl}-4-hydroxynaphthalene-2,7-disulfonate 2,2'-(methylimino)diethanol (1:1) and 3,3'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[6-amino-4-hydroxynaphthalene-2-sulphonic] acid, lithium sodium salt, compound with 2,2'-(methylimino)diethanol and 3,3'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[5-amino-4-hydroxynaphthalene-2,7-disulphonic] acid, lithium sodium salt, compound with 2,2'-(methylimino)diethanol
EC Number:
916-916-7
Molecular formula:
not available
IUPAC Name:
Reaction mass of lithium sodium 5-amino-3-{[4-(2-{4-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)diazenyl]-2-sulfophenyl}vinyl)-3-sulfophenyl]diazenyl}-4-hydroxynaphthalene-2,7-disulfonate 2,2'-(methylimino)diethanol (1:1) and 3,3'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[6-amino-4-hydroxynaphthalene-2-sulphonic] acid, lithium sodium salt, compound with 2,2'-(methylimino)diethanol and 3,3'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[5-amino-4-hydroxynaphthalene-2,7-disulphonic] acid, lithium sodium salt, compound with 2,2'-(methylimino)diethanol
Test material form:
liquid
Details on test material:
Composition: 30.8% (w/w) dyestuff and 69.2% (w/w) water
Purity: 30.8% (w/w) dyestuff

Test animals

Species:
rat
Strain:
Wistar
Details on test animals or test system and environmental conditions:
Animal Information
Animals
Strain/Species: RccHan™;WIST rat.
Supplier: Envigo RMS Limited.
Number of animals ordered: 96 time mated females.
Spare animals were removed from the study room after treatment commenced.
Duration of acclimation: 5 days before commencement of pairing.
Age of the animals at the
start of the study (Day 1 of
gestation): 11 to 12 weeks old.
Weight range of the animals
at the start of the study
(Day 1 of gestation): 178 to 241 g

Allocation and Identification
Allocation: On arrival (Day 1 of gestation).
Method: Allocation was controlled to prevent any mating male from providing more than one mated female in each treatment group.
Identification of animals: Each animal was assigned a number and identified uniquely within the study by a tail tattoo.
Identification of cages: Each cage label was color-coded according to group and was numbered uniquely with cage and study number, as well as the identity of the occupant.

Animal Care and Husbandry
Environmental Control
Rodent facility: Limited access - to limit entry of external biological and chemical agents and to limit the transference of such agents between rooms.
Air supply: Filtered fresh air which was passed to atmosphere and not recirculated.
Temperature and relative humidity: Monitored and maintained within the range of 20-24ºC and 40-70%.
Lighting: Artificial lighting, 12 hours light : 12 hours dark with simulated periods of dawn and dusk..
Electricity supply: Public supply with automatic stand-by generators.

Animal Accommodation
Cages: Cages comprised of a polycarbonate body with a stainless steel mesh lid (Tecniplast, UK); changed at appropriate intervals.
Cage distribution: The cages constituting each group were blocked by group and mounted in batteries.
Bedding: Solid bottom cages contained softwood based bark-free fiber bedding (JRS Lignocel, Mansfield, UK), which was changed at appropriate intervals each week.
Number of animals per cage: One female.

Environmental Enrichment
Aspen chew block: A soft white untreated wood block; provided to each cage throughout the study and replaced when necessary.
Plastic shelter: Provided to each cage throughout the study and replaced at the same time as the cages.

Diet Supply
Diet: SDS VRF1 Certified pelleted diet (SDS, Special Diet Services, Witham, UK). The diet contained no added antibiotic or other chemotherapeutic or prophylactic agent.
Availability: Non-restricted.

Water Supply
Supply: Potable water from the public supply via polycarbonate bottles with sipper tubes. Bottles were changed three times per week.

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
water
Details on exposure:
Formulation
Vehicle: Purified water.
Validated concentration range: 1 mg/mL to 100 mg/mL.
Method of preparation: A series of solutions at the required concentrations were prepared by dilution of individual weighings of the test item formulation supplied.
Frequency of preparation: Weekly.
Storage of formulation: Refrigerated (2-8°C).
Test item accounting: Detailed records of compound usage were maintained.

Formulation Analysis
Stability: Before commencement of treatment, the suitability of the proposed mixing procedures was determined and specimen formulations at 1 and 100 mg/mL were analyzed to assess the stability of the test item in the liquid matrix.
Achieved concentration: Samples of each formulation prepared for administration in Weeks 1 and 2 of treatment were analyzed for achieved concentration of the test item.
Analytical verification of doses or concentrations:
yes
Details on analytical verification of doses or concentrations:
Test item: Bayscript Blaukomponente MDA
EC number: EC 916-916-7
Appearance: Dark blue liquid
Purity: 30.8% (w/w) dyestuff
Purity/weighing factor: The test item is a reaction mass which cannot be separated from water therefore a correction factor was not applied.
Details on mating procedure:
Time mated females were used.
Duration of treatment / exposure:
Females were treated from Day 6 to Day 19 (inclusive) after mating, once daily at approximately the same time each day.
Frequency of treatment:
Females were treated from Day 6 to Day 19 (inclusive) after mating, once daily at approximately the same time each day.
Duration of test:
Animals were killed on Day 20 after mating for reproductive assessment and fetal examination.
Doses / concentrationsopen allclose all
Dose / conc.:
0 mg/kg bw/day
Remarks:
Vehicle
Dose / conc.:
100 mg/kg bw/day
Remarks:
Bayscript Blaukomponente MDA
Dose / conc.:
330 mg/kg bw/day
Remarks:
Bayscript Blaukomponente MDA
Dose / conc.:
1 000 mg/kg bw/day
Remarks:
Bayscript Blaukomponente MDA
No. of animals per sex per dose:
22 female animals per dose
Control animals:
yes, concurrent vehicle
Details on study design:
The dose levels selected for this study are 100, 330 and 1000 mg/kg/day as supplied (active material: 30.8, 102 and 308 mg/kg/day).
In a preliminary rat embryo-fetal survival and development study, administration of Bayscript Blaukomponente MDA to rats by oral gavage during the organogenesis phase of pregnancy (Days 6 to 19 after mating) at 250, 500 and 1000 mg/kg/day (active material: 77, 154 and 308 mg/kg/day) was well tolerated. The no observed adverse effect level (NOAEL) for maternal toxicity and embryo-fetal survival and development was considered to be 1000 mg/kg/day, therefore target doses of 100, 330 or 1000 mg/kg/day were considered acceptable for this study.

Examinations

Maternal examinations:
Serial Observations

Clinical Observations
Animals were inspected visually at least twice daily for evidence of ill-health or reaction to treatment. Cages and cage-trays were inspected daily for evidence of animal ill-health amongst the occupant(s). Any deviation from normal was recorded at the time in respect of nature and severity, date and time of onset, duration and progress of the observed condition, as appropriate.
During the acclimation period, observations of the animals and their cages were recorded at least once per day.

Signs Associated with Dosing
Detailed observations were recorded daily at the following times in relation to dose administration:
Predose observation
As each animal returned to its home cage 1 to 2 hours after completion of dosing As late as possible in the working day

Clinical Signs
A detailed physical examination was performed on each animal on Days 5, 12, 18 and 20 after mating to monitor general health.

Body Weight
The weight of each adult was recorded on Days 1, 3 and 6-20 after mating.

Food Consumption
The weight of food supplied to each adult, that remaining and an estimate of any spilled was recorded for the periods Days 1-2, 3-5, 6-9, 10-13, 14-17 and 18-19 after mating inclusive.

Terminal Investigations

Necropsy
All adult females were subject to a detailed necropsy. After a review of the history of each animal, a full macroscopic examination of the tissues was performed. All external features and orifices were examined visually. Any abnormality in the appearance or size of any organ and tissue (external and cut surface) was recorded and the required tissue samples preserved in appropriate fixative.
Examination included a detailed assessment and documentation of any color changes in the internal organs, adipose tissue or skin. If color changes were observed, representative photographs were taken before retained tissues were placed in fixative.
Schedule Females surviving until the end of the scheduled study period were killed on Day 20 after mating.
Sequence To allow satisfactory inter-group comparison to minimise effects from the timing of the necropsy across groups.

Organ weights
Kidneys were weighed for adult females.

Ovaries and uterine content:
Reproductive Assessment
For all females surviving to term, the following was recorded:
Uterus Gravid uterine weight (including cervix and ovaries).

The following were recorded for all animals:
For each ovary/uterine horn the number of: Corpora lutea, Implantation sites, Resorption sites (classified as early or late), Fetuses (live and dead).
Apparently non-pregnant animals and for apparently empty uterine horns: The number of uterine implantation sites were checked after staining with ammonium sulphide.
Fetal examinations:
Fetal Examination and Processing
Examination of all viable fetuses and placentae: Dissected from the uterus, individually weighed and identified within the litter using a coding system based on their position in the uterus. Examined externally with abnormalities recorded. The sex of each fetus was recorded.
Examination of nominally 50% of fetuses in each litter. Sexed internally and eviscerated.
Fixation: Fetuses eviscerated were fixed in Industrial Methylated Spirit (IMS). Remaining fetuses were fixed whole in Bouin’s fluid.
Processing: Bouin’s fixed fetuses were subject to free-hand serial sectioning. IMS fixed fetuses were processed and stained with Alizarin Red and Alcian blue.

Fetal Pathology Examination:
Bouin’s fixed fetuses: Serial sections were examined for visceral abnormalities
Alizarin Red and Alcian blue stained fetuses: Assessed for skeletal and cartilage development and abnormalities.
Statistics:
A statistical analysis was performed.
Indices:
Prenatal losses are separated into pre- and post-implantation phases. Pre-implantation loss was considered to reflect losses due to non-fertilization of ova and failure to implant. It was calculated from the formula:

Pre-implantation loss (%) = [(Number of corpora lutea – Number of implantations): (Number of corpora lutea)] : x 100

Where the number of implantations exceeded the number of corpora lutea observed, pre-implantation loss was assumed to be zero (i.e. no pre-implantation loss was considered to have occurred).

Post-implantation loss was calculated from the formula:

Post-implantation loss (%) = [(Number of implantations – Number of live fetuses): (Number of implantations)] x 100

All group values and SD (as appropriate) were calculated from the individual litter values.
Historical control data:
The rat was chosen as the test species because of the requirement for a rodent species by regulatory agencies. The RccHan™;WIST strain was used because of the availability of historical control data.

Results and discussion

Results: maternal animals

General toxicity (maternal animals)

Clinical signs:
no effects observed
Description (incidence and severity):
There were no signs associated with dosing observed, and there were no test item related clinical signs during the detailed weekly physical examination.
Dermal irritation (if dermal study):
not specified
Mortality:
no mortality observed
Description (incidence):
There were no mortalities.
Body weight and weight changes:
no effects observed
Description (incidence and severity):
There were no test item related effects on bodyweight or gravid uterine weights.
Food consumption and compound intake (if feeding study):
no effects observed
Description (incidence and severity):
There were no test item related effects on food consumption.
Food efficiency:
no effects observed
Water consumption and compound intake (if drinking water study):
not specified
Ophthalmological findings:
not examined
Haematological findings:
not examined
Clinical biochemistry findings:
not examined
Urinalysis findings:
not examined
Behaviour (functional findings):
not examined
Immunological findings:
not examined
Organ weight findings including organ / body weight ratios:
no effects observed
Description (incidence and severity):
There were no test item related effects on body weight adjusted kidney weights on Day 20 of gestation
Gross pathological findings:
no effects observed
Description (incidence and severity):
Macroscopically, the kidneys of the dams given 330 or 1000 mg/kg/day were dark. This finding was considered to be related to the colour of the test item and therefore considered not to be adverse.
Neuropathological findings:
not examined
Histopathological findings: non-neoplastic:
not examined
Histopathological findings: neoplastic:
not examined
Other effects:
no effects observed
Details on results:
Administration of Bayscript Blaukomponente MDA to rats by oral gavage administration during the organogenesis and fetal growth phase of pregnancy (Days 6-19 after mating) at 100, 330 or 1000 mg/kg/day produced no maternal toxicity.

Maternal developmental toxicity

Number of abortions:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Pre- and post-implantation loss:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Total litter losses by resorption:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Early or late resorptions:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Dead fetuses:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Changes in pregnancy duration:
no effects observed
Description (incidence and severity):
Migrated Data from removed field(s)
Field "Effects on pregnancy duration" (Path: ENDPOINT_STUDY_RECORD.DevelopmentalToxicityTeratogenicity.ResultsAndDiscussion.ResultsMaternalAnimals.MaternalDevelopmentalToxicity.EffectsOnPregnancyDuration): no effects observed
Changes in number of pregnant:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Other effects:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Details on maternal toxic effects:
Administration of Bayscript Blaukomponente MDA to rats by oral gavage administration during the organogenesis and fetal growth phase of pregnancy (Days 6-19 after mating) at 100, 330 or 1000 mg/kg/day produced no maternal toxicity.

Effect levels (maternal animals)

Key result
Dose descriptor:
NOAEL
Effect level:
1 000 mg/kg bw/day
Based on:
test mat.
Basis for effect level:
other: Administration of Bayscript Blaukomponente MDA to rats by oral gavage administration during the organogenesis and fetal growth phase of pregnancy (Days 6-19 after mating) at 100, 330 or 1000 mg/kg/day produced no maternal toxicity.

Maternal abnormalities

Key result
Abnormalities:
no effects observed

Results (fetuses)

Fetal body weight changes:
no effects observed
Description (incidence and severity):
Group mean placental, litter and fetal weights were similar in all groups.
Migrated Data from removed field(s)
Field "Fetal/pup body weight changes" (Path: ENDPOINT_STUDY_RECORD.DevelopmentalToxicityTeratogenicity.ResultsAndDiscussion.ResultsFetuses.FetalPupBodyWeightChanges): no effects observed
Reduction in number of live offspring:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Changes in sex ratio:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Changes in litter size and weights:
no effects observed
Description (incidence and severity):
There were no test item related effects on any gestation or litter parameters evaluated (implantation rate, pre and post implantation loss, litter size and sex ratio).
Changes in postnatal survival:
not examined
External malformations:
no effects observed
Description (incidence and severity):
There was no adverse effect of maternal treatment on the incidence of major and minor abnormalities and skeletal variants.
Skeletal malformations:
no effects observed
Description (incidence and severity):
There was no adverse effect of maternal treatment on the incidence of major and minor abnormalities and skeletal variants.
Visceral malformations:
no effects observed
Description (incidence and severity):
There was no adverse effect of maternal treatment on the incidence of major and minor abnormalities and skeletal variants.
Other effects:
no effects observed
Details on embryotoxic / teratogenic effects:
Administration of Bayscript Blaukomponente MDA to rats by oral gavage administration during the organogenesis and fetal growth phase of pregnancy (Days 6-19 after mating) at100, 330 or 1000 mg/kg/day produced no maternal toxicity or any effects on embryofetal survival or development.

Effect levels (fetuses)

Key result
Dose descriptor:
NOAEL
Effect level:
1 000 mg/kg bw/day
Based on:
test mat.
Sex:
male/female
Basis for effect level:
other: see 'Remarks'

Fetal abnormalities

Key result
Abnormalities:
no effects observed

Overall developmental toxicity

Key result
Developmental effects observed:
no

Any other information on results incl. tables

Litter data - group mean values on Day 20 of gestation

Dose Group

Dose (mg/kg/day) 

 Control

1

0

MDA

2

100 

 MDA

3

330

MDA

4

1000 

                       

Group/

Sex

  

Corpora

Lutea

  Implantations

       Resorptions

Early Late Total

       Live Young

Male Female Total

 Sex ratio

(%M)

    Implantation Loss (%)

Pre- Post-
 1F

Mean

SD

N

11.7

1.68

21 

10.4

2.38

21 

0.9

21 

0.0

21 

0.9

21 

5.0

2.12

21 

4.5

2.02

21 

9.5

2.60

21 

53.3

21 

1.4

21 

9.4

21 
 2F

Mean

SD

N 

12.4

1.42

17 

10.9

2.29

17 

0.8

17 

0.0

17 

0.8

17 

4.6

2.00

17 

 5.5

2.03

17

10.1

2.47

17 

45.9

17 

12.6

17 

8.3

17 
 3F

 Mean

SD

N

11.4

1.70

20 

10.5

2.16

20 

0.7

20 

0.1

20 

0.8

20 

4.9

1.90

20 

4.9

1.87

20 

9.7

2.36

20 

50.5

20 

8.9

20 

 7.2

20
 4F

 Mean

SD

N

12.0

2.46

21 

10.1

2.91

21 

0.5

21 

0.0

21 

0.6

21 

4.1

1.80

21 

5.4

2.46

21 

9.5

3.01

21 

46.1

21 

17.9

21 

6.3

21 

Fetal examinations - major abnormality findings - group incidences

Dose Group

Dose (mg/kg/day) 

 Control

1

0

MDA

2

100 

 MDA

3

330

MDA

4

1000 

                                        

 

Placental

Weight

Litter

Weight

 Litter

Size

 Male Fetal

Weight

 Female Fetal

Weight

 Overall Fetal

Weight

    
 1F

Mean

SD

N

0.52

0.048

21

34.96

9.329

21

9.48

2.600

21

3.79

0.269

21

3.63

0.200

21

3.71

0.223

21

    
 2F

Mean

SD

N 

0.53

0.089

17

37.77

9.604

17

10.12

2.472

17

3.83

0.264

17

3.68

0.321

17

3.75

0.290

17

    
 3F

 Mean

SD

N

0.53

0.060

20

36.20

8.420

20

9.70

2.364

20

3.82

0.245

20

3.68

0.195

20

3.75

0.213

20

    
 4F

 Mean

SD

N

0.55

0.149

21

35.84

11.588

21

9.52

3 .010

21

3.92

0.311

21 

3.68

0.284

20

3.80

0.340

21

    

Litter data - group mean values on Day 20 of gestation

Dose Group

Dose (mg/kg/day) 

 Control

1

0

MDA

2

100 

 MDA

3

330

MDA

4

1000 

                                            

Fetuses

 Litters

Group

Number examined

total Number Affected

1

199

1

2*

172

1

3

194

1

4

200

2

1

21

2

2*

17

1

3

20

  1

4

21

  2

Head

Visceral

Microphthalmia/absent optic nerve

0

1

0

0

0

1

 

0

 

0

Cervical/Thoracic

Visceral

Dorsally displaced pulmonary trunk

Muscular ventricular septal defect

Diaphragmatic hernia

0

0

1

0

0

0

0

0

1

1

1

0

0

0

1

0

0

0

0

0

1

1

1

0

 

Lumbar (and abdominal)/Sacral/Caudal

Visceral

 

Imperforate anus

Anury

 

0

0

0

0 

 

0

0

 

1

1

 

0

0

 

0

0

 

0

0

 

1

1

Note: Individual fetuses/litters may occur in more than one category.

* Litter 28 excluded from group incidences – Suspected Day 21

Fetal examinations - minor skeletal abnormality and variants findings - group incidences

Dose Group

Dose (mg/kg/day) 

 Control

1

0

MDA

2

100 

 MDA

3

330

MDA

4

1000 

                                            

Fetuses

 Litters

Group

Number examined

1

100

2*

85

3

99

4

99

1

21

2*

17

3

20

4

21

Minor skeletal abnormalities

Ribs

Sternebrae

Costal cartilage

Total affected by one or more of the above

medially thickened/kinked

bipartite ossified

misaligned ossification sites

misaligned hemicentres

misshapen

branched

1st not connected to sternum

partially fused

misaligned

interrupted

7th not connected to sternum

hole in xiphoid

branched xiphoid

Total affected by one or more of the above

0

1

2

1

0

0

0

0

1

7

1

4

1

15

1

0

2

0

0

1

1

1

0

2

0

1

1

8

0

0

1

0

0

0

0

1

0

6

1

4

2

13

0

0

0

1

1

0

0

0

1

1

0

4

0

7

0

1

2

1

0

0

0

0

1

7

1

3

1

12

1

0

2

0

0

1

1

1

0

2

0

1

1

7

 

0

0

1

0

0

0

0

1

0

4

1

4

2

9

 

0

0

0

1

1

0

0

0

1

1

0

4

0

7

Rib and vertebral configuration

Cervical rib

Cervical vertebrae

13th rib short

Number of 14th ribs short

Thoracolumbar vertebrae

Pelvic girdle

Delayed/Incomplete ossification/unossified

Cranial

Sternebrae

Vertebrae cervical

short supernumerary

full supernumerary

additional

short

short supernumerary

full supernumerary

total

20

unilateral cranial shift

unilateral caudal shift

cranial centres

5th and/or 6th

other

total

cervical

thoracic

sacrocaudal

2

0

0

2

26

0

26

1

0

1

3

33

10

37

0

0

1

1

0

0

0

16

1

17

0

1

1

5

13

3

13

0

2

0

1

1

1

1

29

1

29

1

0

3

3

7

9

13

0

2

0

2

0

0

0

31

0

31

0

0

0

9

12

8

15

1

4

0

1

0

0

2

13

0

13

1

0

1

2

17

7

18

0

0

1

1

0

0

0

9

1

10

0

1

1

3

6

2

6

0

2

0

1

1

1

1

13

1

13

1

0

3

2

5

5

8

0

1

0

2

0

0

0

14

0

14

0

0

0

6

8

7

10

1

4

0

 Increased ossification

Cranial

Cervical vertebral centra

  

partially fused jugal to maxilla

all ossified

 1

19

 0

14

 

2

18

 

2

10

1

9

 

0

6

 

2

10

 

2

7

Note: Individual fetuses/litters may occur in more than one category.

* Litter 28 excluded from group incidences – Suspected Day 21

Fetal examinations - minor visceral abnormality and necropsy findings - group incidences

Dose Group

Dose (mg/kg/day) 

 Control

1

0

MDA

2

100 

 MDA

3

330

MDA

4

1000 

                                            

Fetuses

 Litters

Group

Number examined

Total Number Affected

1

99

31

2*

87

30

3

95

29

4

101

14

1

21

18

2*

17

15

3

20

16

4

20

11

Visceral abnormalities

Brain

Eyes

Thyroid

Thymus

Azygos vein

Diaphragm

Liver

Kidney(s)

Ureter(s)

Testis(es)

Umbilical artery

Haemorrhages

Head

Abdomen

General

dilated interventricular foramen

variation in lens shape

small lobe

partially undescended lobe

thymic remnant

dilated

thinning with liver protrusion

fissured posterior caudate lobe

small renal papilla

dilated renal pelvis

dilated/marked

undescended

malpositioned

left

brain

abdominal cavity

subcutaneous

0

1

0

9

0

1

1

0

0

0

0

0

2

18

4

0

0

3

0

1

1

0

0

0

0

1

0

1

0

0

16

4

5

2

0

1

0

9

2

0

0

1

1

1

1

1

2

9

6

1

2

0

1

0

2

0

0

1

0

0

0

0

0

0

8

2

2

0

0

1

0

6

0

1

1

0

0

0

0

0

2

13

4

0

0

2

0

1

1

0

0

0

0

1

0

1

0

0

10

4

5

2

0

1

0

8

2

0

0

1

1

1

1

1

2

9

6 

1

1

 

0

1

0

2

0

0

1

0

0

0

0

0

0

7

2

2

0

Necropsy observations (external)

Skin

shiny

0

1

0

0

0

1

0

0

Note: Individual fetuses/litters may occur in more than one category.

* Litter 28 excluded from group incidences – Suspected Day 21

Applicant's summary and conclusion

Conclusions:
Administration of Bayscript Blaukomponente MDA to rats by oral gavage administration during the organogenesis and fetal growth phase of pregnancy (Days 6-19 after mating) at 100, 330 or 1000 mg/kg/day produced no maternal toxicity or any effects on embryofetal survival or development.
Macroscopically, the kidneys of the dams given 330 or 1000 mg/kg/day were dark. This finding was considered to be related to the colour of the test item and therefore considered not to be adverse.
The no observed adverse effect level (NOAEL) for maternal toxicity and embryo-fetal survival and development was considered to be 1000 mg/kg/day. According to CLP classification criteria (Regulation (EC) No 1272/2008) a classification is not justified.
Executive summary:

The purpose of this study was to assess the influence of Bayscript Blaukomponente MDA on embryo-fetal survival and development when administered during the organogenesis and fetal growth phases of pregnancy (Days 6-19 after mating) in the Han Wistar rat.

Three groups of 22 females received Bayscript Blaukomponente MDA at doses of 100, 330 or 1000 mg/kg/day by oral gavage administration, from Day 6 to 19 after mating. A similarly constituted control group received the vehicle, purified water, at the same volume dose as the treated groups. Animals were killed on Day 20 after mating for reproductive assessment and fetal examination.

Clinical observations, body weight and food consumption were recorded. Adult females were examined macroscopically at necropsy on Day 20 after mating, kidney weights and the gravid uterus weights were recorded. All fetuses were examined macroscopically at necropsy and subsequently by detailed internal visceral examination or skeletal examination, including cartilaginous examination.

Results

There was an increased incidence of dark kidneys in the treated groups, predominantly those given 330 or 1000 mg/kg/day, when compared with control in females killed on Day 20 of gestation.

Otherwise, there were no effects of treatment on maternal or litter parameters, including external fetal examination.

Conclusion

Administration of Bayscript Blaukomponente MDA to rats by oral gavage administration during the organogenesis and fetal growth phase of pregnancy (Days 6-19 after mating) at 100, 330 or 1000 mg/kg/day produced no maternal toxicity or any effects on embryofetal survival or development.

Macroscopically, the kidneys of the dams given 330 or 1000 mg/kg/day were dark. This finding was considered to be related to the colour of the test item and therefore considered not to be adverse.

The no observed adverse effect level (NOAEL) for maternal toxicity and embryo-fetal survival and development was considered to be 1000 mg/kg/day.