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Diss Factsheets

Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin irritation: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23 - 26 Oct 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP - Guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report date:
2012

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: other guideline: ECVAM international validation study on in vitro tests for acute skin irritation: Report on the validity of the EPISKIN and EpiDerm assays and on the Skin Integrity Function Test (Altern Lab Anim. 2007 Dec.; 35 (6): 559-601)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: Protocol for: IN VITRO EpiDerm™ SKIN IRRITATION TEST (EPI-200-SIT), Rev. 3/23/2009, MatTek Corporation, Ashland, USA
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Mainz, Germany

Test material

Constituent 1
Chemical structure
Reference substance name:
2,2-dimethyl-1,3-propanediyl dioleate
EC Number:
255-713-1
EC Name:
2,2-dimethyl-1,3-propanediyl dioleate
Cas Number:
42222-50-4
Molecular formula:
C41H76O4
IUPAC Name:
2,2-dimethyl-1,3-propanediyl dioleate
Details on test material:
- Name of test material (as cited in study report): 2,2-dimethyl-1,3-propanediyl dioleate
- Physical state: yellowish liquid
- Analytical purity: 100%
- Lot/batch No.: OE 10124A
- Expiration date of the lot/batch: 2013-01-24
- Storage condition of test material: in a closed vessel at room temperature (20 ± 5 °C)

Test animals

Species:
human
Strain:
other: EpiDermTM; reconstructed three-dimensional human epidermis (EPI-200)
Details on test animals or test system and environmental conditions:
TEST SKIN MODEL
- Source: MatTek In Vitro Life Science Laboratories, Bratislava, Slovakia

TEST METHOD
The EpiDermTM model consists of normal, human-derived epidermal keratinocytes which have been cultured to form a multi-layered, highly differentiated model of the human epidermis. It consists of organised 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. Irritant materials are identified by their ability to penetrate the stratum corneum and to damage the underlaying cell layers which is determined through a decrease in cell viability as determined by MTT reduction assay.

ADAPTATION TO CELL CULTURE CONDITIONS
Prior to treatment, tissue inserts were transferred into 6-well plates containing 900 µL assay medium per well. The plates were pre-incubated in an incubator for 1 h (37 °C, 5% CO2) before use. After pre-incubation, tissue-free wells were filled with 0.9 mL fresh assay medium and the tissues were inserted into the respective wells. Afterwards, tissues were incubated at 37 °C and 5% CO2 for a period of 18 h.

INCUBATION CONDITIONS (INCUBATOR)
- Temperature (°C): 37
- CO2 gas concentration (%): 5

Test system

Type of coverage:
other: open (in vitro system)
Preparation of test site:
other: intact reconstructed human epidermis
Vehicle:
unchanged (no vehicle)
Controls:
other: concurrent control tissues treated with DPBS served as negative controls, positive controls were exposed to 5% SDS
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied: 30 µL

NEGATIVE CONTROL SUBSTANCE:
- Negative control substance: Dulbecco’s phosphate buffered saline (DPBS without CaCl2 and MgCl2)
- Amount(s) applied: 30 µL

POSITIVE CONTROL SUBSTANCE:
- Positive control substance: SDS, 5% (v/v) in deionised water
- Amount(s) applied: 30 µL
Duration of treatment / exposure:
1 h
Observation period:
not applicable, post-treatment incubation period: 42 h
Number of animals:
not applicable, the test was performed in triplicates for each treatment and control group
Details on study design:
REMOVAL OF TEST SUBSTANCE
- Washing: the tissues were rinsed with DPBS to remove residual test substance
- Time after start of exposure: 1 h
- Post-treatment incubation period: 42 h

CELL VIABILITY MEASUREMENTS
For determining alterations in cell viability, MTT reduction assays were performed 42 h after the incubation period. Therefore, tissues were incubated in 0.3 mL MTT solution (1 mg/mL in medium) for 3 h at 37 °C and 5% CO2. After aspiration of the MTT solution, tissues were washed with DPBS for several times and subsequently thoroughly dried. For the extraction of the formazan product, each tissue insert was placed into an empty pre-warmed 24-well plate and 2 mL of isopropanol was pipetted onto each insert. After shaking the plate for 2 h at room temperature, the optical density was measured at 570 nm in a 96-well plate using a plate spectral photometer.

Results and discussion

In vitro

Resultsopen allclose all
Irritation / corrosion parameter:
other: other: cell viability (% of negative control)
Value:
100
Remarks on result:
other:
Remarks:
Basis: other: mean value of negative controls (DPBS). Time point: 1 h . Reversibility: other: reversibility: not applicable. (migrated information)
Irritation / corrosion parameter:
other: other: cell viability (% of negative control)
Value:
7.8
Remarks on result:
other:
Remarks:
Basis: other: mean value of positive controls (5% SDS). Time point: 1 h. Reversibility: other: reversibility: not applicable. (migrated information)
Irritation / corrosion parameter:
other: other: cell viability (% of negative control)
Value:
100.3
Remarks on result:
other:
Remarks:
Basis: other: mean value of tissues treated with the test item (100%). Time point: 1 h. Reversibility: other: reversibility: not applicable. (migrated information)

In vivo

Irritant / corrosive response data:
No irritating potential of the test substance was observed, since the mean relative cell viability of tissues was ≥ 50% compared to the negative control. The positive and negative controls showed the expected results and therefore validated the study.
Other effects:
No further effects were observed.

Any other information on results incl. tables

RESULTS OF THE PRE-TESTS

After 1 h incubation, a mixture of the test substance with 0.3 mL water did not result in colour formation, which might interfere with the measurement of optical density in the main study. No direct MTT reduction was caused by the test substance as shown by the observation that the MTT solution did not change its colour after 1 h incubation with the test substance. No reaction with the nylon mesh was observed after 1 h incubation with the test substance.

Table 3. Results of MTT assay after 1 h exposure

 

Negative control

Test item

Positive control

Tissue sample

1

2

3

1

2

3

1

2

3

OD570

2.132

2.151

2.044

2.084

2.028

2.044

2.227

2.225

2.074

2.066

1.958

1.971

0.214

0.211

0.215

0.216

0.222

0.225

OD570(mean)

2.081

2.003

1.975

2.165

2.009

1.904

0.152

0.155

0.163

OD570(mean values of replicates ± %RSD)

2.020 ± 2.7

2.026 ± 6.5

0.157 ± 3.6

Viability (%)

100

100.3

7.8

OD = optical density; RSD = relative standard deviation

Applicant's summary and conclusion

Interpretation of results:
not irritating
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
CLP: not classified
DSD: not classified