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Updated: May 31, 2026

Revealing the Ferroptotic Phenotype of Medulloblastoma
Published on: March 15, 2024
Activation of the p62/Keap1/Nrf2 Pathway Protects Against Ferroptosis in Cerebral Ischemia-Reperfusion Injury
Canwen Liu1,2, Xuanyi Dong1, Biao Tang1,3
1Key Laboratory of Vascular Biology and Translational Medicine, Hunan University of Chinese Medicine, 410208 Changsha, Hunan, China.
Background:
Protein p62 interacts with Kelch-like ECH-associated protein 1 (Keap1) competitively, triggering the oxidative stress response mediated by NF-E2-related factor 2 (Nrf2) and preventing ferroptosis in SH-SY5Y cells. Emerging evidence implicates that this regulatory axis may confer neuroprotection against cerebral ischemia-reperfusion injury (CIRI). The current investigation was designed to elucidate whether the p62/Keap1/Nrf2 signaling pathway contributes to the amelioration of CIRI through modulation of ferroptosis.
Methods:
In SH-SY5Y cells, we used an oxygen-glucose deprivation/reperfusion (OGD/R) paradigm. In Sprague-Dawley rats, we used a middle cerebral artery occlusion/reperfusion (MCAO/R) model. Through these models, we investigated the effects of p62/Keap1/Nrf2 pathway activation. Additionally, we used in vitro experiments to analyze ferroptosis markers, cell damage, and the expression of pathway proteins. We injected the p62-overexpressing lentivirus into SH-SY5Y cells and the lateral ventricle of rats subjected to MCAO/R. Finally, we investigated the effects of an Nrf2 activator and a ferroptosis inhibitor.
Results:
Nrf2 negatively regulated OGD/R-triggered ferroptosis in SH-SY5Y cells by increasing glutathione peroxidase 4 (GPX4) expression and decreasing acyl-CoA synthetase long-chain family member 4 (ACSL4) levels. p62 overexpression in cells enhanced the interaction between Keap1 and p62, activating Nrf2 and protecting against OGD/R-triggered ferroptosis. Activating the p62/Keap1/Nrf2 signaling pathway in vivo reduced the brain injury area, decreased neuromotor functional impairment, and decreased the expression of ferroptosis markers in rats.
Conclusions:
Activation of the p62/Keap1/Nrf2 signaling pathway reduces ferroptosis and alleviates CIRI. This protective mechanism provides novel directions for investigating the pathological mechanisms of CIRI.
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