Sedolisin

Endpoint summary

Description of key information

Sedolisin was tested for skin and eye irritation.

- The acceptance criteria was fulfilled and the assay was deemed valid and the control test substances performed as expected. Sedolisin, batch PPF38268 did not cause any skin irritation and is classified as being a non-irritant (No category) under the conditions applied in this assay.

- Sedolisin, batch PPF38268 was tested in human corneal epithelial cells assay and revealed a viability of 88.1%. Therefore, it is not irritating to the eye (No Category), when tested in the present model under the test conditions.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vitro / ex vivo

Remarks:

in vitro

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 April 2017 to 01 June 2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)

Deviations:

no

GLP compliance:

no

Remarks:

See'Justification for information'

Test system:

human skin model

Remarks:

SKINETHICTM RHE tissue model.

Source species:

human

Cell type:

non-transformed keratinocytes

Cell source:

foreskin from multiple donors

Vehicle:

unchanged (no vehicle)

Details on test system:

According to INVITTOX Protocol SKINETHIC™ Skin Corrosivity Test
SKIN PREPARATION
- Procedure used: SKINETHICTM RHE tissue model. The cells were removed from packaging plate and transferred to 6-well plates containing 1 mL growth medium.
TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: 37ºC and 5% CO2
- Temperature of post-treatment incubation (if applicable): Same
REMOVAL OF TEST MATERIAL AND CONTROLS
- Number of washing steps: The nylon mesh was removed from tissue surface and rinsed once with 25 mL PBS. The bottom of the insert and the atypical side of the tissue was dried.
- Observable damage in the tissue due to washing: None
- Modifications to validated SOP: None
DYE BINDING METHOD
- Dye used in the dye-binding assay: MTT
- Spectrophotometer: Yes, but not specified.
- Wavelength: 570 nm
- Filter: Not specified
- Filter bandwidth: Not specified
NUMBER OF INDEPENDENT TESTING RUNS / EXPERIMENTS TO DERIVE FINAL PREDICTION: 1
PREDICTION MODEL / DECISION CRITERIA
Negative Control: Negative Control ≥ 1.2 OD and SD is ≤ 18%.
Positive Control: Expressed as % of Neg. Cont. ≤ 40 % and SD is ≤ 18%.
Test Substance: Difference in viability between two replicas is ≤ 18%

Amount/concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 16 μL
- Concentration (if solution): used as is

NEGATIVE CONTROL
- Amount(s) applied (volume or weight): 16 μL
- Concentration (if solution): used as is
POSITIVE CONTROL
- Amount(s) applied (volume or weight): 16 μL
- Concentration (if solution): used as is

Duration of treatment / exposure:

42 min.

Duration of post-treatment incubation (if applicable):

42 ± 1 hours.

Number of replicates:

Triplicate tissues each for test substance, negative control Phosphate Buffered Saline and positive control 5% Sodium Dodecyl Sulphate.

Type of coverage:

open

Preparation of test site:

other: Not necessary since they are skin membranes

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 16 μL
- Concentration (if solution): used as is

NEGATIVE CONTROL
- Amount(s) applied (volume or weight): 16 μL
- Concentration (if solution): used as is
POSITIVE CONTROL
- Amount(s) applied (volume or weight): 16 μL
- Concentration (if solution): used as is

Duration of treatment / exposure:

42 minutes

Details on study design:

TEST SITE
- Area of exposure: not specified
- Type of wrap if used: Nylon mesh

REMOVAL OF TEST SUBSTANCE
- Washing (if done): With PBS
- Time after start of exposure: Exposure time 42 min, post-exposure time 42 ± 1 h.

SCORING SYSTEM:
- Method of calculation: OD measurement with a spectrophotometer

Irritation / corrosion parameter:

% tissue viability

Run / experiment:

1

Value:

0

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

- OTHER EFFECTS:
- Direct-MTT reduction: Not specified
- Colour interference with MTT: Not specified

The experiment was considered valid if:
Negative Control: Negative Control ≥ 1.2 OD and SD is ≤ 18%.
Positive Control: Expressed as % of Neg. Cont. ≤ 40 % and SD is ≤ 18%.
Test Substance: Difference in viability between two replicas is ≤ 18%

Interpretation of results:

GHS criteria not met

Conclusions:

The acceptance criteria was fulfilled and the assay was deemed valid and the control test substances performed as expected. Sedolisin, batch PPF38268 did not cause any skin irritation and is classified as being a non-irritant (No category) under the conditions applied in this assay.

Executive summary:

The purpose of the study was to evaluate the skin irritation potential of sedolisin, batch PPF38268. This was done by employing SKINETHIC^TM RHE tissue model.

Skin irritation refers to the production of reversible damage to the skin following application of a test substance.

The irritation potential of the test substance is assessed by two methods:

• Visual evaluation of the color of the cell in the wells.

• The MTT spectrophotometric measurement at 570 nm on Enspire.

Both methods are based on the take-up of MTT in living cells and the hence the conversion of MTT to a blue dye that can be measured spectrophotometrically.

The test substance was given as is in amounts of 16 μL for 42 min, followed by an inclubation period of 42 ± 1 h.

The acceptance criteria was fulfilled and the assay was deemed valid and the control test substances performed as expected. Sedolisin, batch PPF38268 did not cause any skin irritation and is classified as being a non-irritant (No category) under the conditions applied in this assay.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vitro / ex vivo

Remarks:

In vitro

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 April 2017 to 28 April 2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

OECD Guideline 492 (Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage)

Deviations:

no

GLP compliance:

no

Remarks:

See'Justification for type of information'

Species:

human

Strain:

other: SkinEthic Human Corneal Epithelium (HCE)

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

30 µL of undiluted test substance.

Duration of treatment / exposure:

30 min

Duration of post- treatment incubation (in vitro):

30 minutes ± 2 minutes at 37°C, 5% CO2, ≥ 95% humidity.

Number of animals or in vitro replicates:

3

Details on study design:

Performed according to In vitro Prediction Assay for Acure Ocular Irritation of Liquid Chemicals SkinEthic Human Corneal Epithelial Model (SkinEthicTM HCE).
Treatment:
Apply 30 μL of test liquid to apical side of insert.
Treat tissue with adapted intervals according to the rinsing-off intervals (3 min).
Treat negative control with PBS
Treat positive control with Methyl Acetate
Incubate for 30 minutes ± 2 minutes at 37°C, 5% CO2, ≥ 95% humidity.

Test liquid were rinsed away after exposure:
Adjust distribution to 10 mL and rinse every tissue 2 times (20 mL).
Transfer the rinsed tissue to a new well containing 750 µL fresh maintenance medium (2nd line on the plate).
Apply 750 µL fresh maintenance medium apically to the tissue.
Make sure no air bubbles are trapped underneath the inserts.
Incubate for 30 minutes ± 2 minutes at 37°C, 5% CO2, ≥ 95% humidity.

Irritation parameter:

in vitro irritation score

Value:

0

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Interpretation of results:

GHS criteria not met

Conclusions:

Sedolisin, batch PPF38268 tested in human corneal epithelial cells revealed a viability of 88.1%. Therefore, it is not irritating to the eye (No Category), when tested in the present model under the test conditions.

Executive summary:

The Human Corneal Epithelium Assay (HCE) from SkinEthic (France) was used to assess the eye irritation potential of the test substance. The MTT conversion assay, which measures the NAD(P)H-dependent microsomal enzyme reduction of MTT to a blue formazan precipitate, was used to assess cellular metabolism after exposure to a test substance for the defined exposure time.

The test system and procedure described in In Vitro Prediction Assay for Acute Ocular Irritation of Liquid Chemicals SkinEthic Human Corneal Epithelial Model (SkinEthicTM HCE) was used.

Sedolisin, batch PPF38268 tested in human corneal epithelial cells revealed a viability of 88.1%. Therefore, it was not irritating to the eye (No Category), when tested in the present model under the test conditions.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Justification for classification or non-classification

Not classified.