lysophospholipaseIUBMB 3.1.1.5

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

read-across based on grouping of substances (category approach)

Adequacy of study:

key study

Study period:

20 March 2009 - 05 August 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Due to the similarity between the two enzymes, the results from lipase can be extrapolated to lysophospholipase.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Active enzyme protein of Lipase, triacylglycerol (EC no. 232-619-9, CAS no. 9001-62-1, EC name: Lipase, triacylglycerol, Enzyme Class No.: 3.1.1.3)

Cas Number:

9001-62-1

Molecular formula:

Not applicable, see remarks

IUPAC Name:

Active enzyme protein of Lipase, triacylglycerol (EC no. 232-619-9, CAS no. 9001-62-1, EC name: Lipase, triacylglycerol, Enzyme Class No.: 3.1.1.3)

Constituent 2

Reference substance name:

Protein as a constituent of enzyme deriving from the fermentation or extraction process

Molecular formula:

Not available

IUPAC Name:

Protein as a constituent of enzyme deriving from the fermentation or extraction process

Constituent 3

Reference substance name:

Inorganic salts as a constituent of enzyme deriving from the fermentation or extraction process

Molecular formula:

Not available. See remarks.

IUPAC Name:

Inorganic salts as a constituent of enzyme deriving from the fermentation or extraction process

Constituent 4

Reference substance name:

Carbohydrates constituent of enzyme deriving from the fermentation or extraction process

Molecular formula:

Not available. See remarks.

IUPAC Name:

Carbohydrates constituent of enzyme deriving from the fermentation or extraction process

Constituent 5

Reference substance name:

Lipids as a constituent of enzyme deriving from the fermentation or extraction process

Molecular formula:

Not available. See remarks.

IUPAC Name:

Lipids as a constituent of enzyme deriving from the fermentation or extraction process

Test material form:

solid

Details on test material:

- Substance type: UVCB
- Physical state: translucent tan liquid

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Covance Research Products, Inc., Denver, PA.
- Age at study initiation: Approximately 19 weeks
- Weight at study initiation: 2.8 kg
- Housing: Individually housed in suspended cages
- Diet (e.g. ad libitum): Fresh PMI Rabbit Chow (Diet #5321) ad libitum
- Water (e.g. ad libitum): Ad libitum
- Acclimation period: At least five days

ENVIRONMENTAL CONDITIONS
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 25 March 2009 To: 28 March 2009

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: Contralateral eye served as control.

Amount / concentration applied:

0.1 mL

Duration of treatment / exposure:

Eyelids were held together for about one second and then released.

Observation period (in vivo):

Assessment of ocular damage/irriation was made at 1, 24, 48 and 72 hours post dose.

Number of animals or in vitro replicates:

3

Details on study design:

SCORING SYSTEM: Calculated from the weighted Draize scale
TOOL USED TO ASSESS SCORE: Mini-Maglite® flashlight; fluorescein at the 24 hr observation interval with ultraviolet light source.

Results and discussion

In vivo

Results

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

0

Remarks on result:

other: No ocular effects were noted during the study

Irritant / corrosive response data:

There was no corneal opacity or iritis noted at any observation period. Conjunctival irritation, noted as discharge at the 1-hour reading in 1/3 eyes, cleared by 24 hours.
No other ocular effects were observed in any of the three animals at any time during the study. The substance is not classified as an eye irritant under GHS criteria based on the results of this study.

Applicant's summary and conclusion

Interpretation of results:

not irritating

Conclusions:

Lipase should be classified as "Non Irritant".

Executive summary:

The study was conducted according to OECD Guideline No. 405 and complied with all GLP standards.

Three New Zealand rabbits (1 female; 2 males) were used. The test article (0.1 mL) was instilled in one eye/rabbit. The eyes were scored at 1, 24, 48 and 72 hours post dosing. Sodium fluorescein dye procedures were used at the 24-hour observation interval. The untreated eye served as control.

There were no effects on cornea or iris at any scoring time. Conjunctival irritation, noted as discharge at the 1-hour reading in one animal only, cleared by 24 hours. The eye irritation score based on the 24, 48 and 72 hrs scoring was 0. There were no overt signs of systemic toxicity. Lipase is judged to be a non-irritant to the eye.

GHS Classification: Not classified.

Due to the similarity of enzymes, same conclusion can be reached for the same test substance, lysophospholipase.