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Zhao H, Liang K, Yu Z, Wen Y, Yu X, Xin J, Zhang T, Zu X, Fang Y. CCR3 knockdown attenuates prolonged underwater operations-induced cognitive impairment via alleviating microglia-mediated neuroinflammation. iScience 2024; 27:110379. [PMID: 39156650 PMCID: PMC11326909 DOI: 10.1016/j.isci.2024.110379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 03/17/2024] [Accepted: 06/24/2024] [Indexed: 08/20/2024] Open
Abstract
Maintaining cognitive integrity is crucial during underwater operations, which can significantly impact work performance and risk severe accidents. However, the cognitive effects of underwater operations and their underlying mechanism remain elusive, posing great challenges to the medical protection of professionals concerned. Here, we found that a single underwater operation session affects cognition in a time-dependent model. Prolonged exposure elicits significant cognitive impairment and hippocampal dysfunction, accompanied by increased neuroinflammation. Furthermore, RNA sequencing (RNA-seq) analysis revealed the involvement of neuroinflammation and highlighted the critical role of CCR3. Knockdown of CCR3 significantly rescued cognitive impairment and hippocampal dysfunction and reversed the upregulation of pro-inflammatory cytokines, by switching the activated microglia from a pro-inflammatory to a neuroprotective phenotype. Taken together, these results highlighted the time-dependent effects of a single underwater operation session on cognitive function. Knocking down CCR3 can attenuate neuroinflammation by regulating polarization of activated microglia, thereby alleviating prolonged underwater operations-induced cognitive impairment.
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Affiliation(s)
- Houyu Zhao
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Kun Liang
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200433, China
| | - Zeyuan Yu
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Yukun Wen
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Xuhua Yu
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Jiayun Xin
- Department of Pharmaceutical Analysis, School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | - Tingting Zhang
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Xianpeng Zu
- Department of Natural Medicinal Chemistry, School of Pharmacy, Naval Medical University, Shanghai 200433, China
| | - Yiqun Fang
- National Key Laboratory of Immunity and Inflammation, Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
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Zhao H, Liang K, Yu Z, Wen Y, Shi J, Zhang T, Yu X, Zu X, Fang Y. Hyperbaric oxygen preconditioning rescues prolonged underwater exercise-induced hippocampal dysfunction by regulating microglia activation and polarization. Neurosci Res 2024:S0168-0102(24)00072-5. [PMID: 38848903 DOI: 10.1016/j.neures.2024.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 05/15/2024] [Accepted: 05/30/2024] [Indexed: 06/09/2024]
Abstract
Underwater exercise is becoming increasingly prevalent, during which brain function is necessary but is also at risk. However, no study has explored how prolonged exercise affect the brain in underwater environment. Previous studies have indicated that excessive exercise in common environment causes brain dysfunction but have failed to provide appropriate interventions. Numerous evidence has indicated the neuroprotective effect of hyperbaric oxygen preconditioning (HBO-PC). The objective of this study was to investigate the cognitive effect of prolonged underwater exercise (PUE) and to explore the potential neuroprotective effect of HBO-PC in underwater environment. Rats swimming for 3 h in a simulated hyperbaric chamber (2.0 ATA) was used to establish the PUE animal model and HBO-PC (2.5 ATA for 1, 3,5 times respectively) was administrated before PUE. The results demonstrated that PUE triggers anxiety-like behaviors, cognitive impairment accompanied by hippocampal dysfunction, microglia activation and neuroinflammation. Conversely, 3 HBO-PC rescued anxiety-like behaviors and cognitive impairment. Mechanistically, 3 HBO-PC reduced microglia activation and switched the activated microglia from a pro-inflammatory to neuroprotective phenotype. These findings illustrated that PUE induces anxiety-like behaviors and cognitive impairment and HBO-PC of proper frequency may provide an appropriate and less invasive intervention for protecting the brain in underwater exercise.
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Affiliation(s)
- Houyu Zhao
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Kun Liang
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China; School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200433, China
| | - Zeyuan Yu
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Yukun Wen
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Jin Shi
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Tingting Zhang
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Xuhua Yu
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Xianpeng Zu
- School of Pharmacy, Naval Medical University, Shanghai 200433, China.
| | - Yiqun Fang
- Department of Diving and Hyperbaric Medicine, Navy Special Medical Center, Naval Medical University, Shanghai 200433, China.
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Preece R. Pulmonary oxygen toxicity in occupational diving. Occup Med (Lond) 2023; 73:518. [PMID: 38157485 DOI: 10.1093/occmed/kqad110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024] Open
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