Role of the unfolded protein response (UPR) in cataract formation

Experimental Eye Research
Kengo IkesugiToshimichi Shinohara

Abstract

Cataract is a multifactorial disease, and a large variety of stressors induce cataracts. Many cataractogenic stressors and endoplasmic reticulum (ER) stressors induce the unfolded protein response (UPR) in various cell types. The UPR is known to produce reactive oxygen species (ROS) prior to the inducement of apoptosis. We investigated whether ER stressors induce the UPR in lens epithelial cells (LECs) or whole rat lenses. Our results showed that higher levels of ER stressors activated Bip/GRP78, ATF4, and caspase-12. In addition, ROS were produced, free glutathione was decreased, and apoptosis was induced. LECs in the mitotic zone were the most susceptible to the UPR while the central LECs were the most resistant. The UPR induced the production of ROS in the ER and probably in the mitochondria. The detectable ROS production in cultured lenses is limited to the epithelial cells. These findings indicate that ER stressors induce the UPR in LECs with and without the induction of apoptosis, and we conclude that the UPR is probably one of the initiating factors of many types of cataracts.

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Citations

Mar 8, 2011·Cell Stress & Chaperones·Shuhua SongToshimichi Shinohara
Oct 28, 2009·The Journal of Biological Chemistry·Zeynep FirtinaMelinda K Duncan
Nov 26, 2010·Journal of Ocular Pharmacology and Therapeutics : the Official Journal of the Association for Ocular Pharmacology and Therapeutics·Jun MakitaPeter F Kador
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