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Examination of Kynurenine Toxicity on Corneal and Conjunctival Epithelium: In vitro and in vivo Studies.

08:00 EDT 10th April 2019 | BioPortfolio

Summary of "Examination of Kynurenine Toxicity on Corneal and Conjunctival Epithelium: In vitro and in vivo Studies."

Kynurenine (KYN) is a metabolite of tryptophan, proposed for the treatment of corneal diseases. Our goal was to evaluate the effects of KYN on normal human corneal and conjunctival epithelial cells in vitro and the re-epithelization of corneal erosion in rabbits. In our study, we used corneal (10.014 pRSV-T) and conjunctival (HC0597) epithelium cell cultures. KYN was applied at a concentration range of 1-100 µM for 24 and 48 h. We examined the effects on cellular metabolism, viability, interleukin-1β (IL-1β), IL-6, IL-10 secretion, cytoskeleton organization and transwell migration ability. Following a bilateral corneal de-epithelialization, the rabbits received drops containing 1% KYN and a saline solution to the contralateral control eye, 5 times daily. Digital images were analyzed using the EPCO 2000 software. The metabolic activity of cells was slightly decreased by KYN in the corneal but not in the conjunctival epithelium. The viability of both epithelia was improved by KYN; it caused alterations in the secretion of IL-6 and IL-10 but not IL-1β. It had no impact on both epithelia morphology and the organization of the cellular cytoskeleton. KYN stimulated the formation of pseudopodia projections in both epithelia in vitro, which may be important in terms of wound healing. However, there were no differences in the re-epithelization rate in vivo. At the tested concentrations, KYN was not toxic for the corneal and the conjunctival epithelium in vitro and did not affect corneal re-epithelization in rabbits in vivo. Our results suggest that KYN may be taken into consideration for the treatment of ocular disorders.

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This article was published in the following journal.

Name: Ophthalmic research
ISSN: 1423-0259
Pages: 1-12

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Medical and Biotech [MESH] Definitions

Corneal and conjunctival dryness due to deficient tear production, predominantly in menopausal and post-menopausal women. Filamentary keratitis or erosion of the conjunctival and corneal epithelium may be caused by these disorders. Sensation of the presence of a foreign body in the eye and burning of the eyes may occur.

Stratified squamous epithelium that covers the outer surface of the CORNEA. It is smooth and contains many free nerve endings.

A layer of acellular matrix that lies beneath the CORNEAL EPITHELIUM and above the CORNEAL STROMA. It consists of randomly arranged COLLAGEN fibers in a condensed bed of intercellular substance. It provides stability and strength to the cornea.

The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous CORNEAL EPITHELIUM; BOWMAN MEMBRANE; CORNEAL STROMA; DESCEMET MEMBRANE; and mesenchymal CORNEAL ENDOTHELIUM. It serves as the first refracting medium of the eye. It is structurally continuous with the SCLERA, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the TRIGEMINAL NERVE via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed)

A metabolite of the essential amino acid tryptophan metabolized via the tryptophan-kynurenine pathway.

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