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Skin sensitisation

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Administrative data

Endpoint:
skin sensitisation: in vivo (LLNA)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 10 AUG 2004 to 1 DEC 2004
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study (OECD TG 429)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2004
Report date:
2004

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)
GLP compliance:
yes
Type of study:
mouse local lymph node assay (LLNA)

Test material

Constituent 1
Chemical structure
Reference substance name:
2,2'-[ethylenebis(oxyphenyl-2,1-eneazo)]bis[N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-oxobutyramide
EC Number:
278-770-4
EC Name:
2,2'-[ethylenebis(oxyphenyl-2,1-eneazo)]bis[N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-oxobutyramide
Cas Number:
77804-81-0
Molecular formula:
C36H32N10O8
IUPAC Name:
2,2'-[ethylenebis(oxyphenyl-2,1-eneazo)]bis[N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-oxobutyramide
Test material form:
solid: bulk

In vivo test system

Test animals

Species:
mouse
Strain:
CBA
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Harlan Netherlands BV, Horst, The Netherlands
- Age at study initiation: 8-12 weeks
- Housing: Individually in Macrolon Type I cages with wire mesh top and granulated sooft wood bedding
- Diet: Pelleted standard diet (provided by Harlan Winkelmann GmbH, Borchen, Germany); ad libitum
- Water: Community tap water from Rossdorf, ad libitum
- Acclimation period: yes, but duration not mentioned

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22+/-3
- Humidity (%): 30-74
- Photoperiod (hrs dark / hrs light): 12/12

Study design: in vivo (LLNA)

Vehicle:
dimethylformamide
Concentration:
0, 5, 10, and 15% (w/v)
No. of animals per dose:
4 females per dose group
2 females in the pre-test
Details on study design:
RANGE FINDING TESTS:
- Compound solubility: DMF was selected as solvent, because with this vehicle the highest practically applicable test item concentration could be achieved
- 15% (w/v) was the highest technically applicable concentration whilst avoiding systemic toxicity and excessive local irritation
- Lymph node proliferation response: no data

MAIN STUDY
ANIMAL ASSIGNMENT AND TREATMENT
- Name of test method: LLNA
- Criteria used to consider a positive response:
1: exposure to at least one concentration of the test item resulted in an incorporation of 3H-methyl thymidine at least 3-fold or greater than that recorded in control mice as indicated by the stimulation index
2: data are compatible with a conventional dose response, although allowance must be made for either local toxicity or immunological suppression

TREATMENT PREPARATION AND ADMINISTRATION:
- individual preparation of weight volume dilutions using a magnetic stirrer as homogenizer
- test item preparations were made feshly before each dosing occasion
- 25 µl were spread over the entire dorsal surface of each ear lobe once daily for three consecutive days
Positive control substance(s):
hexyl cinnamic aldehyde (CAS No 101-86-0)
Statistics:
- calculations of mean values and standard deviations for body weight
- the EC3 value was calculated according to the equation EC3 = (a-c) [(3-d)/(b-d)] + c; where EC3 is the estimated concentration of the test item required to produce a 3-fold increase in draining Iymph node cell proliferative activity; (a, b) and (c, d) are respectively the co-ordinates of the two pair of data lying immediately above and below the value of 3 on the local lymph node assay dose response Plot.

Results and discussion

Positive control results:
Stimulation indices of 1.9, 6.1 and 11.5 were determined with the positive control item at concentrations of 5%, 10% and 25% (w/v), respectively, in acetone:olive oil, 4:1 (v/v). An EC3 value was calculated (= 6.3% (w/v)).
Results of the second positive control test revealed stimulation indices of 2.0, 3.0 and 4.9 were determined with the positive control item at concentrations of 5%, 10% and 25% (w/v), respectively, in acetone:olive oil, 4:1 (v/v). An EC3 value was calculated (= 9.9% (w/v)).

In vivo (LLNA)

Resultsopen allclose all
Key result
Parameter:
SI
Value:
2.42
Test group / Remarks:
5%
Key result
Parameter:
SI
Value:
2.77
Test group / Remarks:
10%
Key result
Parameter:
SI
Value:
2.28
Test group / Remarks:
15%
Parameter:
other: disintegrations per minute (DPM)
Remarks on result:
other: Background of measurement: 0 - 1.2; mean: 0.6 (was taken for calculations) control group: 1851.6 5% test item: 4472.8 10% test item: 5128.8 15% test item: 4214.4

Any other information on results incl. tables

The animals did not show any clinical signs during the course of the study and no cases of mortality were observed. Calculation of the EC3 value was not performed because no test concentration produced a SI of 3 or higher.

Test item
concentration
% (w/v)

 

Measurement
DPM

Calculation

Result

DPM-BG
a)

number of
lymph nodes

DPM per
lymph nodeb)

S.I.

---

BG I

0.0

---

---

---

---

---

BG II

1.2

---

---

---

---

---

CG 1

1851.6

1851.0

8

231.4

 

5.0

TG 2

4472.8

4472.2

8

559.0

2.42

10.0

TG 3

5128.8

5128.2

8

641.0

2.77

15.0

TG 4

4214.4

4213.8

8

526.7

2.28

BG = Background (1 ml 5% trichloroacetic acid) in duplicate

CG = Control Group

TG = Test Group

S.I. = Stimulation Index

a)       = The mean value was taken from the figures BG I and BG II

b)       = Since the lymph nodes of the animals of a dose group were pooled, DPM/node was determined by dividing the measured value by the number of lymph nodes pooled

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Remarks:
Regulation (EC) No. 1272/2008
Conclusions:
Tested in this study according to OECD test guideline no. 429 and GLP conditions the test item was not a skin sensitizer.
Executive summary:

In the study the test item dissolved in DMF was assessed for its possible contact allergenic potential.

For this purpose a local lymph node assay was performed using test item concentrations of 5.0 %, 10.0 %, and 15.0 %.

The animals did not show any clinical signs during the course of the study and no cases of mortality observed.

In this study Stimulation Indeces (S.I.) of 2.42, 2.77, and 2.28 were determined with the test item at concentrations of 5.0, 10.0, and 15.0 (w/v) in DMF.

The test item was not a skin sensitiser in this assay.

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