Ocular surface epithelial osmoprotection

Ocular surface epithelial protection via osmoprotection is not a single molecule or receptor but rather describes a protective mechanism involving the use of small organic molecules called osmoprotectants (such as trehalose, betaine, L-carnitine, and erythritol) to shield ocular surface epithelial cells from damage caused by increased tear film osmolarity. In dry eye disease and related conditions, elevated tear osmolarity leads to water loss from epithelial cells, resulting in protein aggregation, oxidative stress, membrane changes, DNA damage, apoptosis (cell death), and inflammation. Osmoprotectants act as compatible solutes that help maintain cell volume and viability under these stressful conditions. They also reduce the expression of pro-inflammatory cytokines such as TNF-alpha and ILs triggered by hyperosmolarity. This approach is used therapeutically in artificial tears or contact lens solutions containing these agents to protect the ocular epithelium from desiccation-induced injury.[3][5][7] Note on correctness: The entry "Ocular surface epithelial protection via osmoprotection" does not refer to a specific molecular target such as a receptor or enzyme; it refers instead to a physiological process or therapeutic strategy involving multiple molecules. Therefore, is_incorrect: true

Other names

Osmoprotective mechanisms of ocular surface epitheliumEpithelial osmoprotectionOcular surface barrier protection via osmolytes

Stabilization of cell volume and prevention of apoptosis under hyperosmotic conditions by acting as compatible solutes (osmolytes)[3][5][7] Reduction in inflammatory cytokine expression and cellular stress responses induced by tear film hyperosmolarity[5][7]