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Role of NADPH Oxidase 4 on Dry Eye Syndrome in Mice.
Journal of Ocular Pharmacology and Therapeutics 2024 April 27
Objective: This study aims to investigate the effect of NADPH oxidase 4 (NOX4)-mediated inflammation on concanavalin A (ConA)-induced dry eye syndrome (DES) in mice. Methods: Thirty-six mice were randomly divided into Control, Model, no-load Control, and NOX4 interference group. Adenovirus was injected (10 μL) into the lacrimal glands of both eyes of mice in no-load Control group and NOX4 interference group. Four days after adenovirus injection, the Control group was injected with phosphate-buffered saline, and the other groups were injected with ConA (200 μg) in the lacrimal glands of mice to establish DES models. The tear secretion rate was estimated by phenol red thread test. Lissamine green eye staining was used to evaluate conjunctival damage. The corneal surface was observed by hematoxylin-eosin (HE) staining and scanning electron microscopy (SEM). The morphology and quantity of conjunctival epithelial cells and goblet cells were observed by Periodic acid-Schiff staining. The expression of NOX4, NOD-like receptor thermal protein domain-associated protein 3 (NLRP3), interleukin-1β (IL-1β), and mucin 5 subtype AC (MUC5AC) was detected by immunohistochemistry. Results: Compared with the Control group, the Model group showed a significant decrease in tear secretion and an upregulation in microscopic image score. The HE staining and SEM showed corneal and conjunctiva damage in the Model group. The protein expression of NOX4, NLRP3, and IL-1β was upregulated, but MUC5AC was downregulated in the Model group. After interfering with NOX4, all these indicators were reversed. Conclusion: The pathological process of concanavalin A-induced DES appears to be related to NOX4.
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