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Skin sensitisation

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Administrative data

Endpoint:
skin sensitisation: in vivo (LLNA)
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP-guideline study. Restriction: only low concentrations tested

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)
Deviations:
yes
Remarks:
no DPM determined
GLP compliance:
yes (incl. QA statement)
Remarks:
BASF AG Experimentelle Toxikologie und Okologie
Type of study:
mouse local lymph node assay (LLNA)

Test material

Constituent 1
Reference substance name:
Propionaldehyde
EC Number:
204-623-0
EC Name:
Propionaldehyde
Cas Number:
123-38-6
IUPAC Name:
propionaldehyde
Details on test material:
- Name of test material (as cited in study report): propionaldehyde
- Analytical purity: 99.6%
- Physical state: liquid / colorless, clear
- Lot/batch No.: 04449775L0
- Stability under test conditions: the stability under storage conditions was confirmed by reanalysis
- Storage condition of test material: refrigerator, exclusion of air (covered with N2)

In vivo test system

Test animals

Species:
mouse
Strain:
other: CBA/CaOlaHsd
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Harlan Winkelmann GmbH, Borchen, FRG
- Age at study initiation: about 9 weeks old
- Weight at study initiation: body weight between 16.8 and 20.3 g at the beginning of the study
- Housing: the single housed animals were identified by cage cards
- Diet: Kliba-Labordiät, Provimi Kliba SA, Kaiseraugust, Basel, Switzerland, ad libitum
- Water: tap water; ad libitum
- Acclimation period: 29 days before the first test substance application

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20-24
- Humidity (%): 30-70
- Photoperiod (hrs dark / hrs light): 12/12

Study design: in vivo (LLNA)

Vehicle:
other: acetone was used as the vehicle because good solubility of the preparation was achieved
Concentration:
1%, 3% and 10% w/w of the test substance in acetone or with the vehicle alone (correctness tested concentrations confirmed by analysis)
No. of animals per dose:
6
Details on study design:
MAIN STUDY
ANIMAL ASSIGNMENT AND TREATMENT
Groups /Number of animals /Animal number /Induction (3 percutaneous applications at day 0, 1 and 2)
Control group 1 /6 /49-54 /Vehicle: acetone
Test group 2 /6 /25-30 /Test substance 1 % in acetone
Test group 2 /6 /31-36 /Test substance 3% in acetone
Test group 2 /6 /37-42 /Test substance 10% in acetone

- Name of test method: the LLNA was performed based on the method of Kimber, I. and Basketter, D.A. (1992).
- Criteria used to consider a positive response: the study procedure was modified according to the method described by Ulrich, P., Streich, J. and Suter, W. (2001), who suggest to evaluate the skin sensitizing potential of test substances by determination of lymph node response using Iymph node weight and lymph node cell count as parameters which are set into perspective to ear weight as an indicator of skin irritation.

TREATMENT PREPARATION AND ADMINISTRATION:
The test substance preparations were produced on a weight by weight (wlw) basis shortly before the application by stirring with a magnetic stirrer and applied as a solution for all applications. The correctness of the concentration of the test substance preparations was investigated. Percutaneous application on dorsal part of both ears (each 25 µl per ear of test substance preparation or vehicle alone).
Positive control substance(s):
other: positive control not included into this study. Historical studies with alpha-Hexylcinnamaldehyde, (85%) are performed twice a year in the laboratory showing that the test system is able to detect sensitizing compounds under the test conditions chosen
Statistics:
Mean values and standard deviations of the measured parameters were calculated for the test and control groups from the individual values. The indices of lymph node weight, cell count and ear weight were calculated as the ratio of the test group mean values for these parameters divided by those of the vehicle control group. Lymph node weight, cell count and ear weight were evaluated with a WILCOXON – Test.

Results and discussion

Positive control results:
The results of the most recent study is included in the study report

In vivo (LLNA)

Resultsopen allclose all
Parameter:
SI
Remarks on result:
other: see Remark
Remarks:
see table 1 and 2. - Lymph node weights and cell counts: treatment of the mice with the 10% test substance preparation induced small but statistically significant increase in lymph node cell counts as compared to the vehicle control group. The lymph node weights were statistically increased and therefore in line with the cell counts. No statistical increase was caused by treatment with 1 % and 3% test substance preparations in both parameters. - Ear weights: treatment of the mice with 1 %, 3% and 10% test substance preparations induced statistically significant increase in ear weight as compared to the vehicle control group.
Parameter:
other: disintegrations per minute (DPM)
Remarks on result:
other: not determined

Any other information on results incl. tables

Table 1: Lymph node weight and cell count

Test group

Treatment (% test substance in vehicle)

Lymph node weight (mg)

Cell count [counts/lymph node pair]

Mean ± SD

Index

Mean ± SD

Index

1

Vehicle

5.0±0.4

1.00

9350000±790470

1.00

2

1%

4.8±0.9

0.94

8587500±1867302

0.92

3

3%

4.7±0.7

0.94

8848667±1411236

0.95

4

10%

6.0±0.8

1.19

10841667±1974725

1.16

  

Table 1: Ear weight

Test group

Treatment (% test substance in vehicle)

Ear weight (mg)

Mean ± SD

Index

1

Vehicle

26.0±0.6

1.00

2

1%

30.5±1.5

1.17

3

3%

28.9±1.4

1.11

4

10%

30.0±1.0

1.15

 

- Body weights: the expected body weight gain was generally observed in the course of the study.

- Other findings: no abnormalities were observed during general observation. No signs of systemic toxicity were noticed.

Applicant's summary and conclusion

Interpretation of results:
not sensitising
Remarks:
Migrated information