Pharmacology and Therapeutics - Research Publications

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Author: Crouch, Peter × Author: Bush, Ashley × Author: Ayton, Scott × Start date: 2017 × End date: 2019 ×

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    Tau-mediated iron export prevents ferroptotic damage after ischemic stroke
    Tuo, Q-Z ; Lei, P ; Jackman, KA ; Li, X-I ; Xiong, H ; Li, X-L ; Liuyang, Z-Y ; Roisman, L ; Zhang, S-T ; Ayton, S ; Wang, Q ; Crouch, PJ ; Ganio, K ; Wang, X-C ; Pei, L ; Adlard, PA ; Lu, Y-M ; Cappai, R ; Wang, J-Z ; Liu, R ; Bush, AI (NATURE PUBLISHING GROUP, 2017-11)
    Functional failure of tau contributes to age-dependent, iron-mediated neurotoxicity, and as iron accumulates in ischemic stroke tissue, we hypothesized that tau failure may exaggerate ischemia-reperfusion-related toxicity. Indeed, unilateral, transient middle cerebral artery occlusion (MCAO) suppressed hemispheric tau and increased iron levels in young (3-month-old) mice and rats. Wild-type mice were protected by iron-targeted interventions: ceruloplasmin and amyloid precursor protein ectodomain, as well as ferroptosis inhibitors. At this age, tau-knockout mice did not express elevated brain iron and were protected against hemispheric reperfusion injury following MCAO, indicating that tau suppression may prevent ferroptosis. However, the accelerated age-dependent brain iron accumulation that occurs in tau-knockout mice at 12 months of age negated the protective benefit of tau suppression against MCAO-induced focal cerebral ischemia-reperfusion injury. The protective benefit of tau knockout was revived in older mice by iron-targeting interventions. These findings introduce tau-iron interaction as a pleiotropic modulator of ferroptosis and ischemic stroke outcome.