TY - JOUR
T1 - Age-Related Conjunctival P2Y2 Receptor Alterations in the Cu, Zn-Superoxide Dismutase-1 (Sod1)-Knockout Dry Eye Model Mice
AU - Dogru, Murat
AU - Shinzawa, Megumi
AU - Kojima, Takashi
AU - Shimizu, Takahiko
AU - Tsubota, Kazuo
N1 - Funding Information:
The authors have no proprietary interest in any of the products mentioned in this article. This work was supported by a research grant from Santen Pharmaceuticals.
Publisher Copyright:
© 2019 Contact Lens Association of Ophthalmologists, Inc.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2019/11/1
Y1 - 2019/11/1
N2 - Purpose:To investigate the effects of aging on the conjunctival P2Y2 receptors, tear functions, and corneal epithelial status from 10 to 50 weeks in the Sod1-/- in comparison with the wild-type mice.Methods:Eight eyes of 4 Sod1-/- male mice and 8 eyes of 4 C57BL6 strain wild-type male mice were examined at 10 and 50 weeks in this study. Tear film breakup time (BUT) and corneal epithelial damage by fluorescein staining were evaluated. Phenol red-impregnated cotton threads were performed without topical anesthesia to measure aqueous tear quantity. Anterior segment photography was also performed at 10 and 50 weeks. Conjunctival specimens underwent immunohistochemistry stainings with anti P2Y2 antibodies. P2Y2 receptor mRNA expression in the bulbar conjunctiva was investigated by using quantitative real-time polymerase chain reaction.Results:The mean tear quantity and BUT scores significantly declined, and the mean fluorescein staining scores significantly increased in both strains of mice from 10 to 50 weeks. % mRNA expression for P2Y2 receptors significantly increased in both mice strains from 10 to 50 weeks.Conclusion:The tear stability, quantity, and ocular surface health decline with aging as evidenced by the decrease in tear BUT, tear quantity, and the increase in ocular surface staining. Conjunctival P2Y2 receptor mRNA was upregulated from 10 to 50 weeks, which we believe is a compensation for the decline of tear functions with aging.
AB - Purpose:To investigate the effects of aging on the conjunctival P2Y2 receptors, tear functions, and corneal epithelial status from 10 to 50 weeks in the Sod1-/- in comparison with the wild-type mice.Methods:Eight eyes of 4 Sod1-/- male mice and 8 eyes of 4 C57BL6 strain wild-type male mice were examined at 10 and 50 weeks in this study. Tear film breakup time (BUT) and corneal epithelial damage by fluorescein staining were evaluated. Phenol red-impregnated cotton threads were performed without topical anesthesia to measure aqueous tear quantity. Anterior segment photography was also performed at 10 and 50 weeks. Conjunctival specimens underwent immunohistochemistry stainings with anti P2Y2 antibodies. P2Y2 receptor mRNA expression in the bulbar conjunctiva was investigated by using quantitative real-time polymerase chain reaction.Results:The mean tear quantity and BUT scores significantly declined, and the mean fluorescein staining scores significantly increased in both strains of mice from 10 to 50 weeks. % mRNA expression for P2Y2 receptors significantly increased in both mice strains from 10 to 50 weeks.Conclusion:The tear stability, quantity, and ocular surface health decline with aging as evidenced by the decrease in tear BUT, tear quantity, and the increase in ocular surface staining. Conjunctival P2Y2 receptor mRNA was upregulated from 10 to 50 weeks, which we believe is a compensation for the decline of tear functions with aging.
KW - Aging
KW - Conjunctiva
KW - Dry eye
KW - P2Y2 receptor
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U2 - 10.1097/ICL.0000000000000581
DO - 10.1097/ICL.0000000000000581
M3 - Article
C2 - 30908311
AN - SCOPUS:85074245185
SN - 1542-2321
VL - 45
SP - 405
EP - 409
JO - Contact and Intraocular Lens Medical Journal
JF - Contact and Intraocular Lens Medical Journal
IS - 6
ER -