Hyoscine

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-08-09 to 2016-08-11

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)

Version / remarks:

26 July 2013

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

issued June 05, 2015

Test material

Test material information

Constituent 1

Reference substance name:

Hyoscine

EC Number:

200-090-3

EC Name:

Hyoscine

Cas Number:

51-34-3

Molecular formula:

C17H21NO4

IUPAC Name:

(1R,2R,4S,5S,7S)-9-methyl-3-oxa-9-azatricyclo[3.3.1.0^{2,4}]nonan-7-yl (2S)-3-hydroxy-2-phenylpropanoate

Test material form:

other: solid: cryst. powder

Specific details on test material used for the study:

SOURCE OF COLLECTED EYES
- Source: Slaughterhouse, Germany
- Storage, temperature and transport conditions of ocular tissue: transported in HBSS containig strep /Pen on ice to the
laboratory
- Time interval prior to initiating testing: corneae were isolated inmediatedly after arrival
of the eyes, corneae were directly used in the BCOP test on the same day
- indication of any existing defects or lesions in ocular tissue samples: eyes presenting defects were discarded

Test animals / tissue source

Species:

cattle

Strain:

other: cornea

Details on test animals or tissues and environmental conditions:

Invitro- Justification of the test method and considerations regarding applicability: The Bovine Corneal Opacity and Permeability (BCOP) test (OECD TG 437; TM B.47) is an in vitro test for the identification of substances inducing serious eye damage, recommended for use as part of a tiered-testing strategy for regulatory classification and labelling.- Description of the cell system used, incl. certificate of authenticity and the mycoplasma status of the cell live- :isolated corneas obtained as by -product from animals freshly slaughered. The fresh eyes were trasnported in HBSS containing Pen/Stre on ice to the laboratoriy. Inmediadely after arrival of the eyes the conrea preparation was initieated including:examination for defects and any defective eyes were discared.The coreas was excised leaving a 2 to 3 mm rim of sclera and stored in a petri dish containig HBSS and posterior mounted on corneal holders . The corneas (which are free of defects were incubated for one hour at 32 °C +-1

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

TEST MATERIAL
- Amount applied: 0.75 mL
- suspended with physiological saline 0.9% NaCl (B. Braun Melsungen lot no. 1406787) to gain a 20% concentration

Duration of post- treatment incubation (in vitro):

After 4 hours +- 5 minutes incubation at 32+-1 °C either test substance and the control substance was removed and the epithelium washed at least three times with MEM (containing phenol red). Once the medium was free of substance, the cormea was finally rinsed with complete RPMI (without phenol red)

Number of animals or in vitro replicates:

3 corneas for the test item, 3 corneas as negative controls treated with physiological saline 0.9%NaCL, 3 corneas as positive controls treated with imidazole 20% in physiological saline 0.9% Na Cl

Details on study design:

SELECTION AND PREPARATION OF CORNEAS: yes

QUALITY CHECK OF THE ISOLATED CORNEAS: yes

NUMBER OF REPLICATES: 3

NEGATIVE CONTROL USED: yes

POSITIVE CONTROL USED: yes

APPLICATION DOSE AND EXPOSURE TIME: 4 hours ± 5 minutes

TREATMENT METHOD: closed chamber

POST-INCUBATION PERIOD: no.

REMOVAL OF TEST SUBSTANCE
- Number of washing steps after exposure period: three times with MEM


METHODS FOR MEASURED ENDPOINTS:
- Corneal opacity: Opacimeter (BASF-OP3.0, Duratec GmbH)
- Corneal permeability: passage of sodium fluorescein dye measured with the aid of [Jenway 6405 UV/VIS spectrophotometry

SCORING SYSTEM: In Vitro Irritancy Score (IVIS)

DECISION CRITERIA: yes

Results and discussion

In vitro

Results

Irritation parameter:

in vitro irritation score

Value:

107.01

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

The in vitro irritation score obtained with the positive control fell within the two standard deviations of the current hystorical mean and therefore the assay is considered to be valid. See other information on results, table 4. The negative control responses result in opacity and permeability values less than the established upper limits of backround bovine cormeas treated with the negative control. All three corneas applicated with the test item showed an all over opacity of the tissue. The mean in vitro irritation score was calculated : 107.01
Visual observation: all 3 corneas treated with Scopolamine showed an allower opacity of the tissue.

Any other information on results incl. tables

Table1: Opacity

Cornea No.	Test item	Initial Opacity	Final Opacity	Change of Opacity Value	Corrected Opacity value
1	Negative Control	1.64	1.97	0.33
2		1.53	1.86	0.33
3		1.64	2.05	0.41
MV		1.60	1.96	0.36
1	Positive Control	2.58	102.31	99.73	99.37
2		2.54	97.64	95.10	94.74
3		2.85	86.34	83.49	83.13
MV		2.66	95.43	92.77	92.41
1	Test item	1.82	107.77	105.95	105. 59
2		0.56	66.06	65.50	65.14
3		0.81	54.77	53.97	53.61
MV		1.06	76.20	75.14	74.78

 

Table 2: Permeability

Cornea No.	Test item	OD490	Corrected OD490 value
1	Negative Control	0.050
2		0.035
3		0.048
MV		0.044
1	Positive Control	3.355	3.311
2		3.495	3.451
3		3.260	3.216
MV		3.37	3.326
1	Test item	1.830	1.786
2		2.140	2.096
3		2.610	2.566
MV		2.193	2.149

 

Table 3: In Vitro Irritation Score

Cornea No.	Test item	OD490	Corrected OD490 value	IVIS
1	Negative Control	0.33	0.050
2		0.33	0.035
3		0.41	0.048
MV		0.36	0.044	1.02
1	Positive Control	99.37	3.311
2		94.74	3.451
3		83.13	3.216
MV		92.41	3.326	142.30
1	Test item	105. 59	1.786
2		65.14	2.096
3		53.61	2.566
MV		74.78	2.149	107.01

 

Table 4: Historical mean In Vitro Irritation Score of the Positive Control

	IVIS Positive Control
Mean value (MV)	125.73
Standard Deviation (SD)	17.05
MV-2xSD	91.64
MV-2xSD	159.83
Number of replicates providing Historical Mean: 15

Applicant's summary and conclusion

Interpretation of results:

Category 1 (irreversible effects on the eye) based on GHS criteria

Conclusions:

All three cormeas applicated with the test item showed an all over opacity of the tissue. The mean in vitro irritation score was calculated to be 107.01. According to the evaluation criteria of the in vitro BCOP test (OECD 437), the test item was classified into UN GHS category 1.