Abstract
Ferroptosis is a novel form of regulated cell death involved in the pathophysiological process of experimental subarachnoid hemorrhage (SAH), but how neuronal ferroptosis occurs remains unknown. In this study, we report that SAH-induced ferroptosis is macroautophagy/autophagy dependent because the inhibition of autophagy by knocking out autophagy-related gene 5 (ATG5) apparently mitigated SAH-induced ferroptosis. We created an experimental SAH model in Sprague–Dawley rats to determine the possible mechanism. We found that SAH can trigger neuronal ferroptosis, as evidenced by the disruption of iron homeostasis, elevation of intracellular lipid peroxidation (LPO) and decreased expression of ferroptosis–protective proteins. Then, we inhibited autophagy by ATG5 gene knockout, showing that autophagy inhibition can reduce the intracellular iron level and LPO, improve the expression of ferroptosis–protective proteins, and subsequently alleviate SAH-induced cell death. Additionally, autophagy inhibition also attenuated SAH prognostic indicators, such as brain edema, blood–brain barrier permeability, and neurological deficits. These findings not only present an opinion that SAH triggers neuronal ferroptosis via activation of ferritinophagy but also indicate that regulating ferritinophagy and maintaining iron homeostasis could provide clues for the prevention of early brain injury.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 81870927), the Natural Science Foundation Project of Chongqing Science and Technology Commission (Grant cstc2019jcyj-msxmX0239 to Prof. Zhaohui He) and the Natural Science Foundation Project of Chongqing Science and Technology Commission (Grant cstc2020jcyj-msxmX0769 to Dr. Yongbing Deng).
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Liang, Y., Deng, Y., Zhao, J. et al. Ferritinophagy is Involved in Experimental Subarachnoid Hemorrhage-Induced Neuronal Ferroptosis. Neurochem Res 47, 692–700 (2022). https://doi.org/10.1007/s11064-021-03477-w
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DOI: https://doi.org/10.1007/s11064-021-03477-w