Kaempferol Inhibits Dry Eye-Related Corneal Inflammation In Vitro Via the p38 Pathway

Abstract

ObjectiveThe purpose of this study is to investigate the effect of kaempferol (KAE), an effective constituent of Buddleja officinalis, on human corneal epithelial cells (HCECs) under a hyperosmolar environment. Methods HCECs were cultured in DMEM/F12 medium and allocated into four groups: normal, model, vehicle, and KAE. Ki67 staining was used to detect HCEC proliferation; TdT-mediated dUTP Nick-End Labeling staining was used to detect HCEC apoptosis; quantified real-time PCR was used to investigate the mRNA relative expression levels of TNF-α, IL-6, and p38. and Western blot was used to reveal the protein expression levels of TNF-α, IL-6, and p38. Results Compared with those in the normal group, the proliferation ability of HCECs was significantly inhibited and the apoptosis rate of HCECs was notably increased in the model group; but KAE could effectively improve HCEC proliferation and reduce HCEC apoptosis. Compared with those in the normal group, the mRNA relative expressions and protein levels of TNF-α, IL-6, and p38 were significantly increased in the model group, which were effectively decreased after KAE intervention. Conclusion KAE could promote HCEC proliferation and reduce cell apoptosis, as well as inhibit the expression of inflammatory factors in a hypertonic-induced HCEC model via the p38MAPK pathway.