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Toxicological information

Eye irritation

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Administrative data

eye irritation: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
31st January 2020 to 11th February 2020
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)
GLP compliance:

Test material

Constituent 1
Chemical structure
Reference substance name:
(3R,6S)-1-benzyl-6-methylpiperidin-3-amine acetyl-L-leucinate [1:1]
EC Number:
Cas Number:
Molecular formula:
(3R,6S)-1-benzyl-6-methylpiperidin-3-amine acetyl-L-leucinate [1:1]
Test material form:
solid: particulate/powder

Test animals / tissue source

not specified
Details on test animals or tissues and environmental conditions:
- Source: Bovine eyes from were obtained from the slaughterhouse Vitelco, -'s Hertogenbosch, The Netherlands
- Characteristics of donor animals: young cattle
- Storage, temperature and transport conditions of ocular tissue: Eyes were collected and transported in physiological saline in a suitable container under cooled conditions.
- indication of any existing defects or lesions in ocular tissue samples: The eyes were checked for unacceptable defects, such as opacity, scratches, pigmentation and neovascularization by removing them from the physiological saline and holding them in the light. Those exhibiting defects were discarded.

Test system

unchanged (no vehicle)
yes, concurrent positive control
yes, concurrent negative control
Amount / concentration applied:
- Amount applied: 302.5 to 337.1 mg
Duration of treatment / exposure:
240 ± 10 minutes
Duration of post- treatment incubation (in vitro):
Number of animals or in vitro replicates:
Details on study design:
The isolated corneas were stored in a petri dish with cMEM (Earle’s Minimum Essential Medium containing 1% (v/v) L-glSOLVENT CONTutamine and 1% (v/v) Fetal Bovine Serum. The isolated corneas were mounted in a corneal holder (one cornea per holder) with the endothelial side against the O-ring of the posterior half of the holder. The anterior half of the holder was positioned on top of the cornea and tightened with screws. The compartments of the corneal holder were filled with cMEM of 32 ± 1°C. The corneas were incubated for the minimum of 1 hour at 32 ± 1°C.

After the incubation period, the medium was removed from both compartments and replaced with fresh cMEM. Opacity determinations were performed on each of the corneas using an opacitometer. The opacity of each cornea was read against a cMEM filled chamber, and the initial opacity reading thus determined was recorded. Corneas that had an initial opacity reading higher than 7 were not used.


A negative control, physiological saline (Merck KGaA, Darmstadt, Germany) was included to detect non-specific changes in the test system and to provide a baseline for the assay endpoints.

The positive control was a 20% (w/v) Imidazole (Merck KGaA, Darmstadt, Germany) solution prepared in physiological saline.

Since no workable suspension of the test item in physiological saline could be obtained, the test item was used as delivered and applied directly on the corneas in such a way that the cornea was completely covered (302.5 to 337.1 mg). Corneas were incubated in a horizontal position for 240 ± 10 minutes at 32 ± 1°C.

TREATMENT METHOD: The holder was slightly rotated, with the corneas maintained in a horizontal position, to ensure uniform distribution of the solutions over the entire cornea.


After the incubation the solutions and the test item were removed and the epithelium was washed at least three times with MEM with phenol red. Possible pH effects of the test item on the corneas were recorded. Each cornea was inspected visually for dissimilar opacity patterns. The medium in the posterior compartment was removed and both compartments were refilled with fresh cMEM and the opacity determinations were performed.

- Corneal opacity:
The opacity of a cornea was measured by the diminution of light passing through the cornea. The light was measured as illuminance (I = luminous flux per area, unit: lux) by a light meter. The opacity value (measured with the device OP-KIT) was calculated according to: (𝐼0/𝐼 − 0.9894) / 0.0251. With I0 the empirically determined illuminance through a cornea holder but with windows
and medium, and I the measured illuminance through a holder with cornea. The change in opacity for each individual cornea (including the negative control) was calculated by subtracting the initial opacity reading from the final post-treatment reading. The corrected opacity for each treated cornea with the test item or positive control was calculated by subtracting the average change in opacity of the negative control corneas from the change in opacity of each test item or positive control treated cornea. The mean opacity value of each treatment group was calculated by averaging the corrected opacity values of the treated corneas for each treatment group.

- Corneal permeability: The medium of both compartments (anterior compartment first) was removed. The posterior compartment was refilled with fresh cMEM. The anterior compartment was filled with 1 mL of 5 mg Na-fluorescein/mL cMEM solution. The holders were slightly rotated, with the corneas maintained in a horizontal position, to ensure uniform distribution of the sodium-fluorescein solution over the entire cornea. Corneas were incubated in a horizontal position for 90 ± 5 minutes at 32 ± 1°C. After the incubation period, the medium in the posterior compartment of each holder was removed and placed into a sampling tube labelled according to holder number. 360 µL of the medium from each sampling tube was transferred to a 96-well plate. The optical density at 490nm(OD490) of each sampling tube was measured in triplicate using a microplate reader. Any OD490 that was 1.500 or higher was diluted to bring the OD490 into the acceptable range (linearity up to OD490 of 1.500 was verified before the start of the experiment). OD490 values of less than 1.500 were used in the permeability calculation. The mean OD490 for each treatment was calculated using cMEM corrected OD490 values. If a dilution has been performed, the OD490 of each reading of the positive control and the test item was corrected for the mean negative control OD490 before the dilution factor was applied to the reading.

SCORING SYSTEM: In Vitro Irritancy Score (IVIS)
The mean opacity and mean permeability values (OD490) were used for each treatment group to calculate an in vitro score:
In vitro irritancy score (IVIS) = mean opacity value + (15 x mean OD490 value)

Results and discussion

In vitro

Irritation parameter:
in vitro irritation score
Run / experiment:
Mean of 3 replicates
Vehicle controls validity:
not applicable
Negative controls validity:
Positive controls validity:
Remarks on result:
not determinable

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
In conclusion, since PF-07202371-S7 induced an IVIS > 3 ≤ 55, no prediction on the classification can be made.
Executive summary:

The objective of this study was to evaluate the eye hazard potential of PF-07202371-S7 as measured by its ability to induce opacity and increase permeability in an isolated bovine cornea using the Bovine Corneal Opacity and Permeability test (BCOP test).
This report describes the potency of chemicals to induce serious eye damage using isolated bovine corneas. The eye damage of the test item was tested through topical application for approximately 240 minutes.
The study procedures described in this report were based on the most recent OECD guideline.
Batch 19-AN-00524 of the test item was a white powder with a purity of 99.9%. Since no workable suspension in physiological saline could be obtained, the test item was used as delivered and added pure on top of the corneas.
The negative control responses for opacity and permeability were less than the upper limits of the laboratory historical range indicating that the negative control did not induce irritancy on the corneas. The mean in vitro irritancy score of the positive control (20% (w/v) Imidazole) was 148 and within two standard deviations of the current historical positive control mean. It was therefore concluded that the test conditions were adequate and that the test system functioned properly.
The test item induced ocular irritation through one endpoint (permeability), resulting in a mean in vitro irritancy score of 14 after 4 hours of treatment.
In conclusion, since PF-07202371-S7 induced an IVIS > 3 ≤ 55, no prediction on the classification can be made.