• Neuroscience · Feb 2024

    Urolithin B attenuates cerebral ischemia-reperfusion injury by modulating Nrf2-regulated anti-oxidation in rats.

    • Zhi-Wei Li, Hua Tang, Xin-Xin Chen, Xuan-Xuan Li, Huan-Huan Xu, Mao-Hua Chen, Hua-Jun Ba, Qun Lin, Jun-Xia Dai, Jian-Yong Cai, Chuan Lu, Xian-Dong Chen, Guo-Sheng Han, and Jun Sun.
    • Department of Neurosurgery, Wenzhou Central Hospital, Wenzhou, China.
    • Neuroscience. 2024 Feb 6; 538: 465846-58.

    AbstractIschemia-reperfusion (IR) induces a wide range of irreversible injuries. Cerebral IR injury (IRI) refers to additional brain tissue damage that occurs after blood flow is restored following cerebral ischemia. Currently, no established methods exist for treating IRI. Oxidative stress is recognized as a primary mechanism initiating IRI and a crucial focal target for its treatment. Urolithin B, a metabolite derived from ellagitannins, antioxidant polyphenols, has demonstrated protective effects against oxidative stress in various disease conditions. However, the precise mechanism underlying UB's effect on IRI remains unclear. In our current investigation, we assessed UB's ability to mitigate neurological functional impairment induced by IR using a neurological deficit score. Additionally, we examined cerebral infarction following UB administration through TTC staining and neuron Nissl staining. UB's inhibition of neuronal apoptosis was demonstrated through the TUNEL assay and Caspase-3 measurement. Additionally, we examined UB's effect on oxidative stress levels by analyzing malondialdehyde (MDA) concentration, superoxide dismutase (SOD) activity, and immunohistochemistry analysis of inducible nitric oxide synthase (iNOS) and 8-hydroxyl-2'-deoxyguanosine (8-OHdG). Notably, UB demonstrated a reduction in oxidative stress levels. Mechanistically, UB was found to stimulate the Nrf2/HO-1 signaling pathway, as evidenced by the significant reduction in UB's neuroprotective effects upon administration of ATRA, an Nrf2 inhibitor. In summary, UB effectively inhibits oxidative stress induced by IR through the activation of the Nrf2/HO-1 signaling pathway. These findings suggest that UB holds promise as a therapeutic agent for the treatment of IRI.Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

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