Urolithin A alleviates blood-brain barrier disruption and attenuates neuronal apoptosis following traumatic brain injury in mice

• Published in: Neural regeneration research Vol. 17; no. 9; pp. 2007 - 2013
• Main Authors: Gong, Qiu-Yuan, Cai, Lin, Jing, Yao, Wang, Wei, Yang, Dian-Xu, Chen, Shi-Wen, Tian, Heng-Li
• Format: Journal Article
• Language: English
• Published: India Wolters Kluwer India Pvt. Ltd 01.09.2022; Medknow Publications & Media Pvt. Ltd; Department of Neurosurgery,Shanghai Jiao Tong University Affiliated Sixth People's Hospital,Shanghai,China; Wolters Kluwer - Medknow; Wolters Kluwer Medknow Publications
• Subjects: Alzheimer's disease; Apoptosis; Autophagy; autophagy; blood-brain barrier; cerebral edema; controlled cortical impact model; neuronal apoptosis; neuropharmacology; neuroprotection; tight junction protein; traumatic brain injury; urolithin a; Blood-brain barrier; Kinases; Traumatic brain injury; blood-brain barrier; autophagy; cerebral edema; tight junction protein; neuroprotection; neuropharmacology; traumatic brain injury; urolithin A; controlled cortical impact model; neuronal apoptosis
• DOI: 10.4103/1673-5374.335163
• ISSN: 1673-5374

Urolithin A (UA) is a natural metabolite produced from polyphenolics in foods such as pomegranates, berries, and nuts. UA is neuroprotective against Parkinson's disease, Alzheimer's disease, and cerebral hemorrhage. However, its effect against traumatic brain injury remains unknown. In this study, we established adult C57BL/6J mouse models of traumatic brain injury by controlled cortical impact and then intraperitoneally administered UA. We found that UA greatly reduced brain edema; increased the expression of tight junction proteins in injured cortex; increased the immunopositivity of two neuronal autophagy markers, microtubule-associated protein 1A/B light chain 3A/B (LC3) and p62; downregulated protein kinase B (Akt) and mammalian target of rapamycin (mTOR), two regulators of the phosphatidylinositol 3-kinase (PI3K)/Akt/mTOR signaling pathway; decreased the phosphorylation levels of inhibitor of NFκB (IκB) kinase alpha (IKKα) and nuclear factor kappa B (NFκB), two regulators of the neuroinflammation-related Akt/IKK/NFκB signaling pathway; reduced blood-brain barrier permeability and neuronal apoptosis in injured cortex; and improved mouse neurological function. These findings suggest that UA may be a candidate drug for the treatment of traumatic brain injury, and its neuroprotective effects may be mediated by inhibition of the PI3K/Akt/mTOR and Akt/IKK/NFκB signaling pathways, thus reducing neuroinflammation and enhancing autophagy.