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Updated: Aug 5, 2026

Morphometric Analyses of Retinal Sections
Published on: February 19, 2012
αA-Crystallin Attenuates Retinal Ischemia-Reperfusion Injury
Huihang Wang1,2,3,4, Yihua Zhu1,2,3,4
1Department of Ophthalmology, The First Afffliated Hospital, Fujian Medical University, Fuzhou, China.
Purpose:
To explore the protective effect and underlying mechanism of exogenous αA-crystallin (CRYAA), a molecular chaperone with antioxidant properties, in retinal ischemia-reperfusion (I/R) injury via modulation of the Nrf2/HO-1 signaling pathway.
Methods:
In vivo, retinal I/R injury was induced in Sprague Dawley rats by transient intraocular pressure elevation, followed by intravitreal CRYAA administration. In vitro, human retinal microvascular endothelial cells (HRMECs) were exposed to H2O2-induced oxidative stress with or without CRYAA treatment. Oxidative markers (ROS, MDA, SOD), apoptosis (TUNEL, Caspase-3), and Nrf2/HO-1 pathway activation were evaluated via histopathology, biochemical assays, Western blotting, and flow cytometry. Nrf2 overexpression and siRNA knockdown were performed to validate pathway involvement.
Results:
CRYAA attenuated retinal edema and structural disorganization in I/R rats, restore partial retinal blood flow, reduced ROS (p < 0.05) and MDA levels, restored SOD activity (p < 0.05), and suppressed apoptosis by downregulating Caspase-3 (p < 0.05). Mechanistically, CRYAA enhanced Nrf2 phosphorylation, nuclear translocation, and HO-1 expression (p < 0.05). Nrf2 overexpression amplified these effects, while Nrf2 silencing abolished CRYAA's protection, confirming pathway dependency.
Conclusions:
Exogenous CRYAA mitigates retinal I/R injury by activating the Nrf2/HO-1 axis, reducing oxidative stress, and inhibiting apoptosis. These findings highlight CRYAA's therapeutic potential for ischemic retinal disorders and underscore Nrf2 as a critical mediator of its protective effects.
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