Androstan-17-one, 3-[[(4-methylphenyl)sulfonyl]oxy]-, (3.beta.,5.alpha.)-

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study completed according to internationally recognized guidelines and GLP.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay)

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2600 (Skin Sensitisation)

GLP compliance:

yes

Type of study:

mouse local lymph node assay (LLNA)

Test material

Test material information

Constituent 1

Reference substance name:

Androsterone tosylate

EC Number:

600-553-3

Cas Number:

10429-07-9

Molecular formula:

C26H3604S

IUPAC Name:

Androsterone tosylate

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Details on test material:

Identification
TRANTOS

Molecular formula
C26H36O4S
Molecular weight
444.63
CAS Number
10429-07-9
Description
White powder (determined at WIL Research Europe B.V.)
Batch
CQE299K1DL2
Purity/Composition
99.9%
Test substance storage
At room temperature in the dark
Stability under storage conditions
Stable
Expiry date
15 January 2014 (allocated by WIL Research Europe B.V.,
1 year after receipt of the test substance)

In vivo test system

Test animals

Species:

mouse

Strain:

CBA

Sex:

female

Details on test animals and environmental conditions:

Species Mouse, CBA/J strain, inbred, SPF-Quality.
Recognized by the international guidelines as the recommended test system (e.g. OECD, EC, EPA).
Source: Janvier, Le Genest-Saint-Isle, France
Number of animals 20 females (nulliparous and non-pregnant), five females per group.
Age and body weight Young adult animals (approx. 9 weeks old) were selected. Body weight variation was within +/- 20% of the sex mean.
Identification Tail mark with marker pen.
Health inspection At least prior to dosing. It was ensured that the animals were healthy and that the ears were intact and free from any abnormality.
Reliability check The results of a reliability test with three concentrations of Hexylcinnamaldehyde in Acetone/Olive oil (4:1 v/v), performed not more than 6 months previously and using the same materials, animal supplier, animal strain and essential procedures is summarized in the appendix of this report. For both scientific and animal welfare reasons, no concurrent positive control group was added to the study.
An extensive data base is available with reliability checks performed each half year during at least the recent 9 years showing reproducible and consistent positive results.

Environmental controls for the animal room were set to maintain 18 to 24°C, a relative humidity of 40 to 70%, approximately 15 room air changes/hour, and a 12-hour light/12-hour dark cycle. Any variations to these conditions were maintained in the raw data and had no effect on the outcome of the study.
Accommodation
Animals were group housed in labeled Makrolon cages (MIII type; height 18 cm) containing sterilised sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France). Paper (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom) and shelters (disposable paper corner home, MCORN 404, Datesand Ltd, USA) were supplied as cage-enrichment. The acclimatization period was at least 5 days before the start of treatment under laboratory conditions. On Day 6, the animals were group housed in Makrolon MII type cages with a sheet of paper instead of sawdust and cage enrichment.
Diet
Free access to pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany).
Water
Free access to tap water.
Diet, water, bedding and cage enrichment evaluation for contaminants and/or nutrients was performed according to facility standard procedures. There were no findings that could interfere with the study.

Study design: in vivo (LLNA)

Vehicle:

propylene glycol

Concentration:

0, 10, 25, 50 % w/w

No. of animals per dose:

5

Positive control substance(s):

hexyl cinnamic aldehyde (CAS No 101-86-0)

Results and discussion

In vivo (LLNA)

Results

Results 1

Parameter:

SI

Remarks on result:

other: 0%: 1.0 10%: 1.7 25%: 1.6 50%: 2.0

Results 2

Parameter:

other: disintegrations per minute (DPM)

Remarks on result:

other: 0%: 235 10%: 396 25%: 369 50%:481

Applicant's summary and conclusion

Interpretation of results:

not sensitising

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Based on these results, TRANTOS would not be regarded as a skin sensitizer according to the recommendations made in the test guidelines. The test substance does not have to be classified and has no obligatory labelling requirement for sensitization by skin contact according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2011) and the Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.

Executive summary:

The SI values calculated for the substance concentrations 10, 25 and 50% were 1.7, 1.6 and 2.0 respectively. Since there was no indication that the test substance elicits an SI ≥ 3 when tested up to 50%, TRANTOS was considered not to be a skin sensitizer. It was established that the EC3 value (the estimated test substance concentration that will give a SI =3) (if any) exceeds 50%. The six-month reliability check with Alpha-hexylcinnamicaldehyde indicates that the Local Lymph Node Assay as performed at WIL Research Europe is an appropriate model for testing for contact hypersensitivity. Based on these results, TRANTOS would not be regarded as a skin sensitizer according to the recommendations made in the test guidelines. The test substance does not have to be classified and has no obligatory labelling requirement for sensitization by skin contact according to the Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.