Tert-butyl hydroperoxide induces trabecular meshwork cells injury through ferroptotic cell death

Abstract

Trabecular meshwork (TM) tissue has a crucial role in regulating aqueous humor circulation in the eye, thus maintaining normal intraocular pressure (IOP). TM dysfunction causes IOP elevation, which leads to glaucoma. To investigate biological changes in TM tissue in patients with glaucoma, we analyzed the mRNA expression microarray dataset, GSE27276. Gene ontology analysis indicated that redox microenvironment imbalance is among the main changes of TM tissue in patients with glaucoma. Subsequently, we induced oxidative stress in TM cells using the tert-butyl hydroperoxide (tBHP) treatment, to generate in vivo and in vitro models, and conducted mRNA sequencing to identify genes with critical roles in maintaining the redox microenvironment balance. We found that the tBHP caused TM dysfunction in vivo, characterized by aqueous humor circulation resistance, IOP elevation, and TM cell death. Further, Kyoto Encyclopedia of Genes and Genomes pathway analysis showed that ferroptosis signaling was enriched in tBHP-treated TM cells. Consistently, in vitro analyses showed that levels of reactive oxygen species, ferric ion, and malondialdehyde were increased after the tBHP treatment, indicating TM cell ferroptosis. Furthermore, inhibiting ferroptosis alleviated tBHP-induced TM cell injury. This study provides new insights suggesting that inhibition of ferroptosis has potential as a treatment for glaucoma.