The component pterostilbene, found naturally in blueberries, shows potential in preventing inflammation and oxidative stress on the human cornea, suggesting protection against dry eyes.
This research employed an in vitro culture model of human corneal epithelial cells, exposing these cells to a hyperosmotic medium. Gene expression was observed via RT-qPCR, while protein production or activity was found using methods including ELISA, zymography, Western blotting, and immunofluorescent staining. Reactive oxygen species' production was also monitored using a DCFDA kit. Pterostilbene was administered and its effects on the expression of pro-inflammatory mediators and reactive oxygen species production were subsequently observed.
The results showed that in corneal cells exposed to hyperosmotic medium, the addition of pterostilbene resulted in a notable decrease in the expression of pro-inflammatory mediators and suppressed overproduction of reactive oxygen species. Furthermore, pterostilbene also showed a significant decrease in the levels of oxidative damage biomarkers; it was found to rebalance homeostasis between oxygenases and anti-oxidative enzymes, demonstrating that pterostilbene has potentially protective effects on the human cornea from inflammation and oxidative stress.
