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Skin irritation / corrosion

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skin corrosion: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25 January 2016 to 29 January 2016
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report Date:

Materials and methods

Test guidelineopen allclose all
according to
OECD Guideline 431 (In Vitro Skin Corrosion: Reconstructed Human Epidermis (RHE) Test Method)
Version / remarks:
Organisation for Economic Co-operation and Development (OECD), OECD Guidelines for Testing of Chemicals, Guideline no. 431: In Vitro Skin Corrosion: reconstructed human epidermis (RHE) test method (adopted 28 July 2015).
according to
EU Method B.40 (In Vitro Skin Corrosion: Transcutaneous Electrical Resistance Test (TER))
Version / remarks:
European Community (EC). Commission regulation (EC) No. 440/2008, Part B: Methods for the Determination of Toxicity and other health effects, Guideline B.40 BIS: "In Vitro Skin Corrosion: Human Skin Model Test". Official Journal of the European Union No. L142, 31 May 2008.
GLP compliance:

Test material

Test material form:
solid: particulate/powder
Specific details on test material used for the study:
Purity by HPLC 100% [a/a]

In vitro test system

Test system:
human skin model
EpiDerm Skin Model
Source species:
Cell type:
non-transformed keratinocytes
Cell source:
other: not specified
Details on animal used as source of test system:
EpiDerm Skin Model (EPI-200, Lot no.: 23297 kit M and N, APPENDIX 4). The model consists of normal, human-derived epidermal keratinocytes which have been cultured to form a multilayered, highly differentiated model of the human epidermis. It consists of organized basal, spinous and granular layers, and a multi-layered stratum corneum containing intercellular lamellar lipid layers arranged in patterns analogous to those found in vivo. The EpiDerm tissues (surface 0.6 cm2) were cultured on polycarbonate membranes of 10 mm cell culture inserts.
Justification for test system used:
Recommended test system in international guidelines (OECD and EC).
unchanged (no vehicle)
Details on test system:
On the day of receipt the tissues were kept on agarose and stored in the refrigerator. On the next day, at least one hour before starting the assay the tissues were transferred to 6-well plates with 0.9 ml DMEM medium.

DMEM (Dulbecco’s Modified Eagle’s Medium)
Supplemented DMEM medium, serum-free supplied by MatTek Corporation.

MTT medium
MTT concentrate (5 mg/ml) diluted (1:5) with MTT diluent (supplemented DMEM). Both supplied by MatTek Corporation.

Environmental conditions
All incubations, with the exception of the test item incubation of 3 minutes at room temperature, were carried out in a controlled environment, in which optimal conditions were a humid atmosphere of 80 - 100% (actual range 79 - 90%), containing 5.0 ± 0.5% CO2 in air in the dark at 37.0 ± 1.0°C (actual range 36.5 - 36.7°C). Temperature and humidity were continuously monitored throughout the experiment. The CO2 percentage was monitored once on each working day. Temporary deviations from the temperature, humidity and CO2 percentage may occur due to opening and closing of the incubator door. Based on laboratory historical data these deviations are considered not to affect the study integrity.
Control samples:
yes, concurrent negative control
yes, concurrent positive control
Amount/concentration applied:
25.0 to 28.8 mg of the solid test item
Duration of treatment / exposure:
Two tissues were used for a 3-minute exposure to PF-06478031-01 and two for a 1-hour exposure
Number of replicates:
2 each group

Results and discussion

In vitro

Resultsopen allclose all
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
3-minute application (% of control)
Negative controls validity:
Positive controls validity:
Remarks on result:
no indication of irritation
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
1-hour application (% of control)
Negative controls validity:
Positive controls validity:
Remarks on result:
no indication of irritation
Other effects / acceptance of results:
PF-06478031-01 was checked for colour interference in aqueous conditions and possible direct MTT reduction by adding the test item to MTT medium. Because the solutions did not turn blue / purple nor a blue / purple precipitate was observed it was concluded that PF-06478031-01 did not interfere with the MTT endpoint.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
As the mean relative tissue viability for PF-06478031-01 was not below 50% after 3 minutes treatment and not below 15% after 1 hour treatment PF-06478031-01 is considered to be not corrosive.

Finally, it is concluded that this test is valid and that PF-06478031-01 is not corrosive in the in vitro skin corrosion test under the experimental conditions described in this report.