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Xiong F, Wang C, Lu J, Bai G, Zhou D, Ling J. 4-PBA exerts brain-protective effects against sepsis-associated encephalopathy in a mouse model of sepsis. Exp Neurol 2024; 375:114738. [PMID: 38395217 DOI: 10.1016/j.expneurol.2024.114738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 02/09/2024] [Accepted: 02/20/2024] [Indexed: 02/25/2024]
Abstract
BACKGROUND Neuroinflammation assumes a pivotal role in both the etiological underpinnings and the dynamic progression of sepsis-associated encephalopathy (SAE). The occurrence of cognitive deficits with SAE is associated with neuroinflammation. 4-phenyl butyrate (4-PBA) may control inflammation by inhibiting endoplasmic reticulum stress (ERS). The primary objective of this investigation is to scrutinize the effectiveness of 4-PBA in mitigating neuroinflammation induced by lipopolysaccharides (LPS) and its consequent impact on cognitive function decline. METHODS LPS-injected mice with SAE and LPS-treated BV2 cell were established to serve as experimental paradigms, both contributing to the investigative framework of the study. Cognitive functions were assessed by behavioral tests. Hippocampal neuronal damage was assessed using Golgi staining and Nissl staining. Quantitative PCR assay and immunofluorescence were used to analyze neuroinflammation. Mitochondrial function was examined using transmission electron microscopy. Protein expression analysis was conducted through the application of western blotting methodology, serving as the investigative approach to elucidate molecular signatures in the experimental framework. Endoplasmic reticulum and mitochondrial calcium flow were detected using flow cytometry. To delve deeper into the mechanistic intricacies, the administration of 4μ8c was employed to selectively impede the IRE1α/Xbp1s pathway, constituting a strategic intervention aimed at elucidating underlying regulatory processes. RESULT Expression levels of ERS-related proteins exhibited a significant upregulation in hippocampal tissues of LPS-treated mice when compared to wild-type (WT) counterparts. The administration of 4-PBA notably ameliorated memory deficits in LPS-treated mice. Furthermore, 4-PBA treatment was found to alleviate oxidative stress and neuroinflammation. Mechanistically, the IRE1α/Xbp1s-Ca2+ signaling pathway played a crucial role in mediating the beneficial effects of mitigating oxidative stress and maintaining mitochondrial calcium homeostasis, with inhibition of the IRE-related pathway displaying opposing effects. CONCLUSION Our results suggest that administration of 4-PBA treatment significantly attenuates ERS, alleviates cognitive decline, reduces inflammatory damage, and restores mitochondrial dynamics via the IRE1α/Xbp1s-Ca2+-associated pathway, which provides a new potential therapeutic approach to SAE.
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Affiliation(s)
- Feng Xiong
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China; Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China
| | - Cailin Wang
- Department of Neurology, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Jun Lu
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China; Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China
| | - Guangyang Bai
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China; Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China
| | - Daixing Zhou
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China; Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China.
| | - Jianmin Ling
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China; Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong university of science and technology, Wuhan 430000, China.
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Gavilán E, Medina-Guzman R, Bahatyrevich-Kharitonik B, Ruano D. Protein Quality Control Systems and ER Stress as Key Players in SARS-CoV-2-Induced Neurodegeneration. Cells 2024; 13:123. [PMID: 38247815 PMCID: PMC10814689 DOI: 10.3390/cells13020123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/03/2024] [Accepted: 01/08/2024] [Indexed: 01/23/2024] Open
Abstract
The COVID-19 pandemic has brought to the forefront the intricate relationship between SARS-CoV-2 and its impact on neurological complications, including potential links to neurodegenerative processes, characterized by a dysfunction of the protein quality control systems and ER stress. This review article explores the role of protein quality control systems, such as the Unfolded Protein Response (UPR), the Endoplasmic Reticulum-Associated Degradation (ERAD), the Ubiquitin-Proteasome System (UPS), autophagy and the molecular chaperones, in SARS-CoV-2 infection. Our hypothesis suggests that SARS-CoV-2 produces ER stress and exploits the protein quality control systems, leading to a disruption in proteostasis that cannot be solved by the host cell. This disruption culminates in cell death and may represent a link between SARS-CoV-2 and neurodegeneration.
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Affiliation(s)
- Elena Gavilán
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Sevilla (US), 41012 Sevilla, Spain; (R.M.-G.); (B.B.-K.); (D.R.)
- Instituto de Biomedicina de Sevilla, IBIS, Hospital Universitario Virgen del Rocío, Junta de Andalucía, CSIC, University of Seville (US), 41013 Sevilla, Spain
| | - Rafael Medina-Guzman
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Sevilla (US), 41012 Sevilla, Spain; (R.M.-G.); (B.B.-K.); (D.R.)
| | - Bazhena Bahatyrevich-Kharitonik
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Sevilla (US), 41012 Sevilla, Spain; (R.M.-G.); (B.B.-K.); (D.R.)
- Instituto de Biomedicina de Sevilla, IBIS, Hospital Universitario Virgen del Rocío, Junta de Andalucía, CSIC, University of Seville (US), 41013 Sevilla, Spain
| | - Diego Ruano
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Sevilla (US), 41012 Sevilla, Spain; (R.M.-G.); (B.B.-K.); (D.R.)
- Instituto de Biomedicina de Sevilla, IBIS, Hospital Universitario Virgen del Rocío, Junta de Andalucía, CSIC, University of Seville (US), 41013 Sevilla, Spain
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