Pyrrolo[3,4-c]pyrrole-1,4-dione, 2,5-dihydro-3,6-bis[4- (octadecylthio)phenyl]-

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2000

Report date:

2000

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Charles River UK, Margate, Kent, England.
- Age and weight at study initiation: Animals used within the study were at least 6 weeks old and body weights were less than 3.5 kg.
- Accomodation: Individually housed in labelled cages with perforated floors (Scanbur, Denmark) and equipped with an automatic drinking system (ITL, Bergen, The Netherlands).
- Diet (e.g. ad libitum): Standard laboratory rabbit diet (Charies River Breeding and Maintenance Diet for Rabbits, Altromin, Germany) approx. 100 g. per day. Certificates of analysis were examined and retained in the NOTOX archives. In addition, hay (BMI, Helmond, the Netheriands) was provided once a week.
- Water (e.g. ad libitum): Free access to tap-water. Certificates of quarteriy analysis were examined and retained in the NOTOX archives.
- Acclimation period: Acclimatisation period was at least 5 days before start of treatment under laboratory conditions.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21
- Humidity (%): 30-70
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12

Test system

Vehicle:

unchanged (no vehicle)

Controls:

not required

Amount / concentration applied:

27.6 ± 1.0 mg of the test substance (a volume of approximately 0.1 ml) in the conjunctival sac of one of the eyes

Duration of treatment / exposure:

24h

Observation period (in vivo):

The eyes of each animal were examined approximately 1, 24, 48 and 72 hours after instillation of the test substance.

Number of animals or in vitro replicates:

3

Details on study design:

After administration, the lids were then gently held together for about one second to prevent loss of the test substance. The other eye remained untreated and served as the reference control.
Immediately after the 24 hour observation, a solution of 2% fluorescein in water (adjusted to pH 7.0) was instilled into both eyes of each animal to quantitatively determine corneal epithelial damage. Any bright green stained area, indicating epithelial damage, was estimated as a percentage of the total corneal area.

SCORING SYSTEM:

CORNEAL IRRITATION
Opacity: degree of density (area most dense taken for reading)
No ulceration or opacity (may include slight dulling of normal lustre) 0
Scattered or diffuse areas of opacity, details of iris clearly visible 1
Easily discemible translucent area, details of iris slightly obscured 2
Nacreous area, no details of iris visible, size of pupil barely discemible 3
Opaque cornea, iris not discemible through the opacity 4

Area of comea involved:
No ulceration or opacity 0
One quarter or less but not zero 1
Greater than one quarter, but less than half 2
Greater than half, but less than three quarters 3
Greater than three quarters, up to whole area 4

IRIS
Normal 0
Markedly deepened rugae, congestion, swelling, moderate circumcorneal hyperaemia,
or injection, any of these or combination thereof, iris still reacting to light
(sluggish reaction is positive) 1
No reaction to light, hemorrtiage, gross destruction (any or all of these) 2

CONJUNCTIVAL IRRITATION
Redness (refers to palpebrae and sclera, excluding comea and iris):
Blood vessels normal 0
Some blood vessels definitely hyperaemic (injected) 1
Diffuse, crimson color, individual vessels not easily discemible 2
Diffuse beefy red 3

Chemosis (refers to lids and/or nictitating membranes):
No swelling 0
Any swelling above normal (Includes nictitating membranes) 1
Obvious swelling with partial eversion of lids 2
Swelling with lids about half closed 3
Swelling with lids more than half closed 4

Discharge:
No discharge (may include small amounts observed in inner canthus of normal animals) 0
Any amount different from normal and/or lacrimation 1
Discharge with moistening of the lids and hairs just adjacent to lids 2
Discharge with moistening of the lids and hairs (considerable area around the eye) 3

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

conjunctivae score

Basis:

mean

Time point:

other: all time points

Score:

0.1

Max. score:

4

Reversibility:

fully reversible within: 48h

Results 2

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

other: all time points

Score:

0

Max. score:

4

Results 3

Irritation parameter:

iris score

Basis:

mean

Time point:

other: all time points

Score:

0

Max. score:

2

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Time point:

other: all time points

Score:

0

Max. score:

4

Irritant / corrosive response data:

Instillation of approximately 28 mg of the test substance (a volume of approximately 0.1 ml) into one eye of each of three rabbits resulted in irritation of the conjunctivae, which was seen as redness and discharge. The irritation had completely resolved within 24 hours in two animals and within 48 hours in the other animal. No iridial irritation or corneal opacity were observed, and treatment of the eyes with 2% fluorescein, 24 hours after test substance instillation revealed no corneal epithelial damage in any of the animals. There was no evidence of ocular corrosion.

Other effects:

Red staining of the fur on the head and paws, caused by the test substance, was noted throughout the observation period. Remnants of the test substance were present in the eyes of all animals on day 1 and on the outside of the eyelids of all animals on day 2. No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred.

Applicant's summary and conclusion

Interpretation of results:

slightly irritating

Remarks:

Migrated information

Conclusions:

Based on these results TKP 50048 induces minor eye irritation.

Executive summary:

Single samples of approximately 28 mg of TKP 50048 (a volume of approximately 0.1 ml) were instilled into one eye of each of three rabbits. Observations were made 1, 24, 48 and 72 hours after instillation.

Instillation of the test substance resulted in irritation of the conjunctivae, which was seen as redness and discharge. The irritation had completely resolved within 24 hours in two animals and within 48 hours in the other animal. Red staining of the fur on the head and paws, caused by the test substance, was noted throughout the observation period. Remnants of the test substance were present in the eyes of all animals on day 1 and on the outside of the eyelids of all animals on day 2.

Based on these results TKP 50048 induces minor eye irritation.