1
|
He X, Hu XY, Yin XY, Wu XM, Liu QR, Shen JC. GluR2 can Drive Neuroinflammation and Cognitive Impairments Following Peripherally Repeated Lipopolysaccharide Exposures. Neurochem Res 2024; 49:2393-2407. [PMID: 38837093 DOI: 10.1007/s11064-024-04183-z] [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: 03/15/2024] [Revised: 05/06/2024] [Accepted: 05/22/2024] [Indexed: 06/06/2024]
Abstract
Neuroinflammation is being increasingly recognized as a vital factor in the development of various neurological and neuropsychiatric diseases. Lipopolysaccharides (LPS), an outer membrane component of gram-negative bacteria, can trigger innate immune responses, resulting in neuroinflammation and subsequent cognitive deficits. The expression of glutamate receptors (GluRs) on glial cells can induce glial activation. Therefore, we hypothesized that repeated LPS exposure can increase GluR levels, promoting microglial activation and ultimately affecting synaptic plasticity and cognitive function. In this study, C57/BL6 mice were repeatedly exposed to LPS to construct a neuroinflammation animal model. The levels of GluRs, inflammatory cytokines, ionized calcium-binding adaptor molecule 1, postsynaptic density protein 95, synaptophysin 38, NMDA receptor 2 A, and NMDA receptor 2B (GluN2B) were measured in the hippocampi. Furthermore, dendritic spine density in the CA1 hippocampal region was determined. Repeated LPS exposure induced cognitive impairments and microglial activation and increased GluR1 and GluR2 levels. This was accompanied by a significant decrease in GluN2B expression and dendritic spine density in the hippocampi. However, CFM-2, an α-amino-3- hydroxy-5-methyl-4-isoxazolepropionate receptor antagonist, reversed these anomalies. Furthermore, minocycline, a microglial inhibitor, reversed these anomalies and downregulated GluR2 but not GluR1 expression. In summary, we demonstrated that GluR2 plays an essential role in microglia-induced neuroinflammation, resulting in synaptic plasticity and cognitive impairment induced by repeated exposure to LPS.
Collapse
Affiliation(s)
- Xue He
- Department of Anesthesiology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Xiao-Yi Hu
- Department of Anesthesiology, the Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Xiao-Yu Yin
- Department of Anesthesiology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Xin-Miao Wu
- Department of Anesthesiology, the Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Qing-Ren Liu
- Department of Anesthesiology, Xishan People's Hospital of Wuxi City, Wuxi, China.
| | - Jin-Chun Shen
- Department of Anesthesiology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, China.
| |
Collapse
|
2
|
Guo H, Li H, Jia Z, Ma S, Zhang J. Edaravone dexborneol attenuates cognitive impairment in a rat model of vascular dementia by inhibiting hippocampal oxidative stress and inflammatory responses and modulating the NMDA receptor signaling pathway. Brain Res 2024; 1833:148917. [PMID: 38582415 DOI: 10.1016/j.brainres.2024.148917] [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: 02/05/2024] [Revised: 03/31/2024] [Accepted: 04/03/2024] [Indexed: 04/08/2024]
Abstract
Exploring the intricate pathogenesis of Vascular Dementia (VD), there is a noted absence of potent treatments available in the current medical landscape. A new brain-protective medication developed in China, Edaravone dexboeol (EDB), has shown promise due to its antioxidant and anti-inflammatory properties, albeit with a need for additional research to elucidate its role and mechanisms in VD contexts. In a research setup, a VD model was established utilizing Sprague-Dawley (SD) rats, subjected to permanent bilateral typical carotid artery occlusion (2VO). Behavioral assessment of the rats was conducted using the Bederson test and pole climbing test, while cognitive abilities, particularly learning and memory, were evaluated via the novel object recognition test and the Morris water maze test. Ensuing, the levels of malondialdehyde (MDA), superoxide dismutase (SOD), IL-1β, IL-6, IL-4, and tumor necrosis factor-α (TNF-α) were determined through Enzyme-Linked Immunosorbent Assay (ELISA). Synaptic plasticity-related proteins, synaptophysin (SYP), post-synaptic density protein 95 (PSD-95), and N-methyl-D-aspartate (NMDA) receptor proteins (NR1, NR2A, NR2B) were investigated via Western blotting technique. The findings imply that EDB has the potential to ameliorate cognitive deficiencies, attributed to VD, by mitigating oxidative stress, dampening inflammatory responses, and modulating the NMDA receptor signaling pathway, furnishing new perspectives into EDB's mechanism and proposing potential avenues for therapeutic strategies in managing VD.
Collapse
Affiliation(s)
- Hui Guo
- Department of Neurology, First Hospital, Shanxi Medical University, Taiyuan,China; First Clinical Medical College, Shanxi Medical University, Taiyuan, China
| | - Haodong Li
- Department of Neurology, First Hospital, Shanxi Medical University, Taiyuan,China; First Clinical Medical College, Shanxi Medical University, Taiyuan, China
| | - Zhisheng Jia
- Department of Neurology, First Hospital, Shanxi Medical University, Taiyuan,China; First Clinical Medical College, Shanxi Medical University, Taiyuan, China
| | - Shuyu Ma
- Department of Neurology, First Hospital, Shanxi Medical University, Taiyuan,China; First Clinical Medical College, Shanxi Medical University, Taiyuan, China
| | - Jin Zhang
- Department of Neurology, First Hospital, Shanxi Medical University, Taiyuan,China.
| |
Collapse
|
3
|
Tian M, Zhan Y, Cao J, Gao J, Sun J, Zhang L. Targeting blood-brain barrier for sepsis-associated encephalopathy: Regulation of immune cells and ncRNAs. Brain Res Bull 2024; 209:110922. [PMID: 38458135 DOI: 10.1016/j.brainresbull.2024.110922] [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: 10/21/2023] [Revised: 02/14/2024] [Accepted: 03/05/2024] [Indexed: 03/10/2024]
Abstract
Sepsis causes significant morbidity and mortality worldwide, most surviving patients show acute or chronic mental disorders, which are known as sepsis-associated encephalopathy (SAE). SAE involves many pathological processes, including the blood-brain barrier (BBB) damage. The BBB is located at the interface between the central nervous system and the surrounding environment, which protects the central nervous system (CNS) from the invasion of exogenous molecules, harmful substances or microorganisms in the blood. Recently, a growing number of studies have indicated that the BBB destruction was involved in SAE and played an important role in SAE-induced brain injury. In the present review, we firstly reveal the pathological processes of SAE such as the neurotransmitter disorders, oxidative stress, immune dysfunction and BBB destruction. Moreover, we introduce the structure of BBB, and describe the immune cells including microglia and astrocytes that participate in the BBB destruction after SAE. Furthermore, in view of the current research on non-coding RNAs (ncRNAs), we explain the regulatory mechanism of ncRNAs including long noncoding RNAs (lncRNAs), microRNAs (miRNAs) and circular RNAs (circRNAs) on BBB in the processes of SAE. Finally, we propose some challenges and perspectives of regulating BBB functions in SAE. Hence, on the basis of these effects, both immune cells and ncRNAs may be developed as therapeutic targets to protect BBB for SAE patients.
Collapse
Affiliation(s)
- Mi Tian
- Department of Anesthesiology, Affiliated Zhongda Hospital of Southeast University, Nanjing, Jiangsu Province, China
| | - Yunliang Zhan
- Department of Anesthesiology and Perioperative Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jinyuan Cao
- Department of Anesthesiology, Affiliated Zhongda Hospital of Southeast University, Nanjing, Jiangsu Province, China
| | - Jinqi Gao
- Department of Anesthesiology, Affiliated Zhongda Hospital of Southeast University, Nanjing, Jiangsu Province, China
| | - Jie Sun
- Department of Anesthesiology, Affiliated Zhongda Hospital of Southeast University, Nanjing, Jiangsu Province, China.
| | - Li Zhang
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China.
| |
Collapse
|
4
|
Guo Y, Feng Y, Jiang F, Hu L, Shan T, Li H, Liao H, Bao H, Shi H, Si Y. Down-regulating nuclear factor of activated T cells 1 alleviates cognitive deficits in a mouse model of sepsis-associated encephalopathy, possibly by stimulating hippocampal neurogenesis. Brain Res 2024; 1826:148731. [PMID: 38154504 DOI: 10.1016/j.brainres.2023.148731] [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: 08/14/2023] [Revised: 11/23/2023] [Accepted: 12/14/2023] [Indexed: 12/30/2023]
Abstract
Sepsis-associated encephalopathy (SAE) is a common complication of sepsis, and has been associated with increased morbidity and mortality. Nuclear factor of activated T cells (NFATs) 1, a transcriptional factor that regulates T cell development, activation and differentiation, has been implicated in neuronal plasticity. Here we examined the potential role of NFAT1 in sepsis-associated encephalopathy in mice. Adult male C57BL/6J mice received intracerebroventricular injections of short interfering RNA against NFAT1 or sex-determining region Y-box 2 (SOX2), or a scrambled control siRNA prior to cecal ligation and perforation (CLP). A group of mice receiving sham surgery were included as an additional control. CLP increased escape latency and decreased the number of crossings into, and total time spent within, the target quadrant in the Morris water maze test. CLP also decreased the freezing time in context-dependent, but not context-independent, fear conditioning test. Knockdown of either NFAT1 or SOX2 attenuated these behavioral deficits. NFAT1 knockdown also attenuated CLP-induced upregulation of SOX2, increased the numbers of nestin-positive cells and newborn astrocytes, reduced the number of immature newborn neurons, and promoted the G1 to S transition of neural stem cells in hippocampus. These findings suggest that NFAT1 may contribute to sepsis-induced behavioral deficits, possibly by promoting SOX2 signaling and neurogenesis.
Collapse
Affiliation(s)
- Yaoyi Guo
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Yue Feng
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Fan Jiang
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Liang Hu
- Department of Pharmacology, Nanjing Medical University, No. 101 Longmiandadao Road, Jiangning District, Nanjing, Jiangsu Province 211166, People's Republic of China
| | - Tao Shan
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Haojia Li
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Hongsen Liao
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Hongguang Bao
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Hongwei Shi
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China
| | - Yanna Si
- Department of Anesthesiology, Nanjing First Hospital, Nanjing Medical University, No. 68 Changle Road, Qinhuai District, Nanjing, Jiangsu Province 210006, People's Republic of China.
| |
Collapse
|
5
|
Khidr HY, Hassan NF, Abdelrahman SS, El-Ansary MR, El-Yamany MF, Rabie MA. Formoterol attenuated mitochondrial dysfunction in rotenone-induced Parkinson's disease in a rat model: Role of PINK-1/PARKIN and PI3K/Akt/CREB/BDNF/TrKB axis. Int Immunopharmacol 2023; 125:111207. [PMID: 37956489 DOI: 10.1016/j.intimp.2023.111207] [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: 10/10/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/15/2023]
Abstract
β2-adrenoreceptors (β2AR have been identified recently as regulators of the α-synuclein gene (SNCA), one of the key milieus endorsed in injury of dopamine neurons in Parkinson's disease (PD). Accumulation of α-synuclein leads to mitochondrial dysfunction via downregulation of mitophagy proteins (PINK-1 and PARKIN) and inhibition of mitochondria biogenesis (PGC-1α) along with an increase in the master inflammatory regulator NF-κB p65 production that provokes neurodegeneration and diminishes neuroprotective signaling pathway (PI3k/Akt/CREB/BDNF). Recently, formoterol exhibited a promising neuroprotective effect against neurodegenerative conditions associated with brain inflammation. Therefore, the present investigation aims to unveil the possible neuroprotective activity of formoterol, β2AR agonist, against rotenone-induced PD in rats. Rats received rotenone (1.5 mg/kg; s.c.) every other day for 3 weeks and cured with formoterol (25 μg/kg/day; i.p.) 1 hr. after rotenone administration, starting from day 11. Formoterol treatment succeeded in upregulating β2-adrenoreceptor expression in PD rats and preserving the function and integrity of dopaminergic neurons as witnessed by enhancement of muscular performance in tests, open field, grip strength-meter, and Rotarod, besides the increment in substantia nigra and striatal tyrosine hydroxylase immunoexpression. In parallel, formoterol boosted mitophagy by activation of PINK1 and PARKIN and preserved mitochondrial membrane potential. Additionally, formoterol stimulated the neuro-survival signaling axis via stimulation of PI3k/pS473-Akt/pS133-CREB/BDNF cascade to attenuate neuronal loss. Noteworthy formoterol reduces neuro-inflammatory status by decreasing NFκBp65 immunoexpression and TNF-α content. Finally, formoterol's potential as a stimulant therapy of mitophagy via the PINK1/PARKIN axis and regulation of mitochondrial biogenesis by increasing PGC-1α to maintain mitochondrial homeostasis along with stimulation of PI3k/Akt/CREB/BDNF axis.
Collapse
Affiliation(s)
- Haneen Y Khidr
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Modern University for Technology and Information, Cairo, Egypt
| | - Noha F Hassan
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Modern University for Technology and Information, Cairo, Egypt
| | - S S Abdelrahman
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Egypt
| | - Mona R El-Ansary
- Department of Biochemistry, Faculty of Pharmacy, Modern University for Technology and Information, Cairo, Egypt
| | - Mohammed F El-Yamany
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, 11562 Cairo, Egypt
| | - Mostafa A Rabie
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, 11562 Cairo, Egypt.
| |
Collapse
|
6
|
Matias ME, Radulski DR, Rodrigues da Silva T, Raymundi AM, Stern CAJ, Zampronio AR. Involvement of cannabinoid receptors and neuroinflammation in early sepsis: Implications for posttraumatic stress disorder. Int Immunopharmacol 2023; 123:110745. [PMID: 37541107 DOI: 10.1016/j.intimp.2023.110745] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/20/2023] [Accepted: 07/29/2023] [Indexed: 08/06/2023]
Abstract
Sepsis is associated with several comorbidities in survivors, such as posttraumatic stress disorder (PTSD). This study investigated whether rats that survive sepsis develop the generalization of fear memory as a model of PTSD. Responses to interventions that target the endothelin-1 (ET-1)/cannabinoid system and glial activation in the initial stages of sepsis were evaluated. As a control, we evaluated hyperalgesia before fear conditioning. Sepsis was induced by cecal ligation and puncture (CLP) in Wistar rats. CLP-induced sepsis with one or three punctures resulted in fear generalization in the survivors 13 and 20 days after the CLP procedure, a process that was not associated with hyperalgesia. Septic animals were intracerebroventricularly treated with vehicle, the endothelin receptor A (ETA) antagonist BQ123, the cannabinoid CB1 and CB2 receptor antagonists AM251 and AM630, respectively, and the glial blocker minocycline 4 h after CLP. The blockade of either CB1 or ETA receptors increased the survival rate, but only the former reversed fear memory generalization. The endothelinergic system blockade is important for improving survival but not for fear memory. Treatment with the CB2 receptor antagonist or minocycline also reversed the generalization of fear memory but did not increase the survival rate that was associated with CLP. Minocycline treatment also reduced tumor necrosis factor-α levels in the hippocampus suggesting that neuroinflammation is important for the generalization of fear memory induced by CLP. The influence of CLP on the generalization of fear memory was not related to Arc protein expression, a regulator of synaptic plasticity, in the dorsal hippocampus.
Collapse
Affiliation(s)
| | | | | | - Ana Maria Raymundi
- Department of Pharmacology, Federal University of Paraná, Curitiba, PR, Brazil
| | | | | |
Collapse
|
7
|
Xin Y, Tian M, Deng S, Li J, Yang M, Gao J, Pei X, Wang Y, Tan J, Zhao F, Gao Y, Gong Y. The Key Drivers of Brain Injury by Systemic Inflammatory Responses after Sepsis: Microglia and Neuroinflammation. Mol Neurobiol 2023; 60:1369-1390. [PMID: 36445634 PMCID: PMC9899199 DOI: 10.1007/s12035-022-03148-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 11/21/2022] [Indexed: 12/03/2022]
Abstract
Sepsis is a leading cause of intensive care unit admission and death worldwide. Most surviving patients show acute or chronic mental disorders, which are known as sepsis-associated encephalopathy (SAE). Although accumulating studies in the past two decades focused on the pathogenesis of SAE, a systematic review of retrospective studies which exclusively focuses on the inflammatory mechanisms of SAE has been lacking yet. This review summarizes the recent advance in the field of neuroinflammation and sheds light on the activation of microglia in SAE. Activation of microglia predominates neuroinflammation. As the gene expression profile changes, microglia show heterogeneous characterizations throughout all stages of SAE. Here, we summarize the systemic inflammation following sepsis and also the relationship of microglial diversity and neuroinflammation. Moreover, a collection of neuroinflammation-related dysfunction has also been reviewed to illustrate the possible mechanisms for SAE. In addition, promising pharmacological or non-pharmacological therapeutic strategies, especially those which target neuroinflammation or microglia, are also concluded in the final part of this review. Collectively, clarification of the vital relationship between neuroinflammation and SAE-related mental disorders would significantly improve our understanding of the pathophysiological mechanisms in SAE and therefore provide potential targets for therapies of SAE aimed at inhibiting neuroinflammation.
Collapse
Affiliation(s)
- Yuewen Xin
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Mi Tian
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Shuixiang Deng
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Jiaying Li
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Miaoxian Yang
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Jianpeng Gao
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Xu Pei
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Yao Wang
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Jiaying Tan
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Feng Zhao
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Yanqin Gao
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China.
| | - Ye Gong
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China.
| |
Collapse
|
8
|
Yue J, Tan Y, Huan R, Guo J, Yang S, Deng M, Xiong Y, Han G, Liu L, Liu J, Cheng Y, Zha Y, Zhang J. Mast cell activation mediates blood-brain barrier impairment and cognitive dysfunction in septic mice in a histamine-dependent pathway. Front Immunol 2023; 14:1090288. [PMID: 36817492 PMCID: PMC9929573 DOI: 10.3389/fimmu.2023.1090288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 01/13/2023] [Indexed: 02/04/2023] Open
Abstract
Introduction Sepsis-associated encephalopathy (SAE) is a diffuse cerebral dysfunction resulting from a systemic inflammatory response to infection; however, its pathophysiology remains unclear. Sepsis-induced neuroinflammation and blood-brain barrier (BBB) disruption are crucial factors in brain function disturbance in SAE. Mast cells (MCs) activation plays an important role in several neuroinflammation models; however, its role in SAE has not been comprehensively investigated. Methods We first established a SAE model by cecal ligation puncture (CLP) surgery and checked the activation of MCs. MCs activation was checked using immumohistochemical staining and Toluidine Blue staining. We administrated cromolyn (10mg/ml), a MC stabilizer, to rescue the septic mice. Brain cytokines levels were measured using biochemical assays. BBB disruption was assessed by measuring levels of key tight-junction (TJ) proteins. Cognitive function of mice was analyzed by Y maze and open field test. Transwell cultures of brain microvascular endothelial cells (BMVECs) co-cultured with MCs were used to assess the interaction of BMVECs and MCs. Results Results showed that MCs were overactivated in the hippocampus of CLP-induced SAE mice. Cromolyn intracerebroventricular (i.c.v) injection substantially inhibited the MCs activation and neuroinflammation responses, ameliorated BBB impairment, improved the survival rate and alleviated cognitive dysfunction in septic mice. In vitro experiments, we revealed that MCs activation increased the sensitivity of BMVECs against to lipopolysaccharide (LPS) challenge. Furthermore, we found that the histamine/histamine 1 receptor (H1R) mediated the interaction between MCs and BMVECs, and amplifies the LPS-induced inflammatory responses in BMVECs by modulating the TLR2/4-MAPK signaling pathway. Conclusions MCs activation could mediate BBB impairment and cognitive dysfunction in septic mice in a histamine-dependent pathway.
Collapse
Affiliation(s)
- Jianhe Yue
- Department of Neurosurgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ying Tan
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Renzheng Huan
- Department of Neurosurgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jin Guo
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Sha Yang
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Mei Deng
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Yunbiao Xiong
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Guoqiang Han
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Lin Liu
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Jian Liu
- Department of Neurosurgery, Guizhou Provincial People's Hospital, Guiyang, China
| | - Yuan Cheng
- Department of Neurosurgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yan Zha
- Department of Nephrology, Guizhou Provincial People's Hospital, Guiyang, China
| | - Jiqin Zhang
- Department of Anesthesiology, Guizhou Provincial People's Hospital, Guiyang, China
| |
Collapse
|
9
|
Tang C, Jin Y, Wang H. The biological alterations of synapse/synapse formation in sepsis-associated encephalopathy. Front Synaptic Neurosci 2022; 14:1054605. [PMID: 36530954 PMCID: PMC9755596 DOI: 10.3389/fnsyn.2022.1054605] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 11/18/2022] [Indexed: 06/12/2024] Open
Abstract
Sepsis-associated encephalopathy (SAE) is a common complication caused by sepsis, and is responsible for increased mortality and poor outcomes in septic patients. Neurological dysfunction is one of the main manifestations of SAE patients. Patients may still have long-term cognitive impairment after hospital discharge, and the underlying mechanism is still unclear. Here, we first outline the pathophysiological changes of SAE, including neuroinflammation, glial activation, and blood-brain barrier (BBB) breakdown. Synapse dysfunction is one of the main contributors leading to neurological impairment. Therefore, we summarized SAE-induced synaptic dysfunction, such as synaptic plasticity inhibition, neurotransmitter imbalance, and synapses loss. Finally, we discuss the alterations in the synapse, synapse formation, and mediators associated with synapse formation during SAE. In this review, we focus on the changes in synapse/synapse formation caused by SAE, which can further understand the synaptic dysfunction associated with neurological impairment in SAE and provide important insights for exploring appropriate therapeutic targets of SAE.
Collapse
Affiliation(s)
| | | | - Huan Wang
- College of Life and Health, Dalian University, Dalian, China
| |
Collapse
|
10
|
Zhang J, Zhang Y, Liu Y, Niu X. Naringenin Attenuates Cognitive Impairment in a Rat Model of Vascular Dementia by Inhibiting Hippocampal Oxidative Stress and Inflammatory Response and Promoting N-Methyl-D-Aspartate Receptor Signaling Pathway. Neurochem Res 2022; 47:3402-3413. [PMID: 36028734 DOI: 10.1007/s11064-022-03696-9] [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: 03/09/2022] [Revised: 07/11/2022] [Accepted: 07/14/2022] [Indexed: 10/15/2022]
Abstract
Vascular dementia (VaD) is the second most common form of dementia globally, yet there are no efficient treatments. Naringenin, a natural flavonoid, exerts antioxidative, anti-inflammatory, and neuroprotective properties; however, its potential effect on VaD remain unclear. Herein, the purpose of present study was to elucidate whether naringenin attenuates cognitive dysfunction in VaD via inhibiting hippocampal oxidative stress and inflammatory response, and promoting N-methyl-D-aspartate receptors (NMDARs) signaling pathway. A rat model of VaD was established by permanent bilateral common carotid artery occlusion [2-vessel occlusion (2VO)]. Behavioral performance analyses results revealed that administration of naringenin improves cognitive impairment in rats with VaD according to the new object recognition test and the Morris water maze test. In addition, naringenin attenuated hippocampal oxidative stress by reducing reactive oxygen species generation, decreasing malondialdehyde content and recombinant reactive oxygen species modulator 1 (Romo-1) expression, and increasing superoxide dismutase and glutathione peroxidase activities in the hippocampus of VaD rats. Moreover, naringenin decreased the proinflammatory cytokines (IL-1β, IL-6, and TNF-α) levels and increased the anti-inflammatory cytokines (IL-10 and IL-4) levels in the hippocampus of 2VO surgery-treated rats, attenuating hippocampal inflammatory response during VaD. Furthermore, naringenin promoted synaptophysin (SYP), postsynaptic density protein 95 (PSD95), N-methyl-Daspartic acid receptor 1 (NR1) and N-methyl-D-aspartate receptor subunit 2B (NR2B) expressions levels in hippocampus of VaD rats. Collectively, these findings indicated that naringenin mitigates cognitive impairment in VaD rats partly via inhibiting hippocampal oxidative stress and inflammatory response and restoring NMDARs signaling pathway.
Collapse
Affiliation(s)
- Jin Zhang
- Department of Neurology, The First Hospital of Shanxi Medical University, No. 85 Jiefang South Road, Yingze District, Taiyuan, 030000, Shanxi, People's Republic of China
| | - Yu Zhang
- Department of Neurology, Shanxi Hospital of Integrated Traditional and Western Medicine, Taiyuan, 030000, Shanxi, People's Republic of China
| | - Yan Liu
- Department of Neurology, The First Hospital of Shanxi Medical University, No. 85 Jiefang South Road, Yingze District, Taiyuan, 030000, Shanxi, People's Republic of China
| | - Xiaoyuan Niu
- Department of Neurology, The First Hospital of Shanxi Medical University, No. 85 Jiefang South Road, Yingze District, Taiyuan, 030000, Shanxi, People's Republic of China.
| |
Collapse
|
11
|
Pathogenesis of sepsis-associated encephalopathy: more than blood-brain barrier dysfunction. Mol Biol Rep 2022; 49:10091-10099. [PMID: 35639274 DOI: 10.1007/s11033-022-07592-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 05/11/2022] [Indexed: 12/19/2022]
Abstract
Sepsis-associated encephalopathy is a common neurological complication of sepsis and is responsible for higher mortality and poorer long-term outcomes in septic patients. Sepsis-associated encephalopathy symptoms can range from mild delirium to deep coma, which occurs in up to 70% of patients in intensive care units. The pathological changes in the brain associated with sepsis include cerebral ischaemia, cerebral haemorrhage, abscess and progressive multifocal necrotic leukoencephalopathy. Several mechanisms are involved in the pathogenesis of sepsis-associated encephalopathy, such as blood-brain barrier dysfunction, cerebral blood flow impairment, glial cell activation, leukocyte transmigration, and neurotransmitter disturbances. These events are interrelated and influence each other, therefore they do not act as independent factors. This review is focused on new evidence showing the pathological process of sepsis-associated encephalopathy.
Collapse
|
12
|
Spectroscopy detects skeletal muscle microvascular dysfunction during onset of sepsis in a rat fecal peritonitis model. Sci Rep 2022; 12:6339. [PMID: 35428849 PMCID: PMC9012880 DOI: 10.1038/s41598-022-10208-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 03/15/2022] [Indexed: 01/20/2023] Open
Abstract
Sepsis is a dysregulated host inflammatory response to infection potentially leading to life-threatening organ dysfunction. The objectives of this study were to determine whether early microvascular dysfunction (MVD) in skeletal muscle can be detected as dynamic changes in microvascular hemoglobin (MVHb) levels using spectroscopy and whether MVD precedes organ histopathology in septic peritonitis. Skeletal muscle of male Sprague-Dawley rats was prepared for intravital microscopy. After intraperitoneal injection of fecal slurry or saline, microscopy and spectroscopy recordings were taken for 6 h. Capillary red blood cell (RBC) dynamics and SO2 were quantified from digitized microscopy frames and MVHb levels were derived from spectroscopy data. Capillary RBC dynamics were significantly decreased by 4 h after peritoneal infection and preceded macrohemodynamic changes. At the same time, low-frequency oscillations in MVHb levels exhibited a significant increase in Power in parts of the muscle and resembled oscillations in RBC dynamics and SO2. After completion of microscopy, tissues were collected. Histopathological alterations were not observed in livers, kidneys, brains, or muscles 6 h after induction of peritonitis. The findings of this study show that, in our rat model of sepsis, MVD occurs before detectable organ histopathology and includes ~ 30-s oscillations in MVHb. Our work highlights MVHb oscillations as one of the indicators of MVD onset and provides a foundation for the use of non-invasive spectroscopy to continuously monitor MVD in septic patients.
Collapse
|
13
|
Wu Y, Li P, Liu L, Goodwin AJ, Halushka PV, Hirose T, Nakagawa S, Zhou J, Liu M, Fan H. lncRNA Neat1 regulates neuronal dysfunction post sepsis via stabilization of hemoglobin subunit beta. Mol Ther 2022; 30:2618-2632. [PMID: 35331906 PMCID: PMC9263235 DOI: 10.1016/j.ymthe.2022.03.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 02/23/2022] [Accepted: 03/17/2022] [Indexed: 10/18/2022] Open
Abstract
Sepsis-associated encephalopathy (SAE) is characterized by acute and diffuse brain dysfunction and correlates with long-term cognitive impairments with no targeted therapy. We used a mouse model of sepsis-related cognitive impairment to examine the role of lncRNA nuclear enriched abundant transcript 1 (Neat1) in SAE. We observed that Neat1 expression was increased in neuronal cells from septic mice and that it directly interacts with hemoglobin subunit beta (Hbb), preventing its degradation. The Neat1/Hbb axis suppressed postsynaptic density protein 95 (PSD-95) levels and decreased dendritic spine density. Neat1 knockout mice exhibited decreased Hbb levels, which resulted in increased PSD-95 levels, increased neuronal dendritic spine density, and decreased anxiety and memory impairment. Neat1 silencing via the antisense oligonucleotide GapmeR ameliorated anxiety-like behavior and cognitive impairment post-sepsis. In conclusion, we uncovered a previously unknown mechanism of the Neat1/Hbb axis in regulating neuronal dysfunction, which may lead to a novel treatment strategy for SAE.
Collapse
|
14
|
Cui YH, Zhou SF, Liu Y, Wang S, Li F, Dai RP, Hu ZL, Li CQ. Injection of Anti-proBDNF Attenuates Hippocampal-Dependent Learning and Memory Dysfunction in Mice With Sepsis-Associated Encephalopathy. Front Neurosci 2021; 15:665757. [PMID: 34354558 PMCID: PMC8329425 DOI: 10.3389/fnins.2021.665757] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 05/26/2021] [Indexed: 12/14/2022] Open
Abstract
Sepsis-associated encephalopathy (SAE) is a risk factor for cognitive and memory dysfunction; however, the mechanism remains unclear. Brain-derived neurotrophic factor (BDNF) was reported to have a positive effect on cognition and emotion regulation, but the study of its precursor, proBDNF, has been limited. This study aimed to elucidate the effects and associated mechanisms of hippocampal proBDNF in a lipopolysaccharide (LPS)-induced SAE mouse model. In this study, we found that the mice exhibited cognitive dysfunction on day 7 after LPS injection. The expression of proBDNF and its receptor, p75NTR, was also increased in the hippocampus, while the levels of BDNF and its receptor, TrkB, were decreased. A co-localization study showed that proBDNF and p75NTR were mainly co-localized with neurons. Furthermore, LPS treatment reduced the expression of NeuN, Nissl bodies, GluR4, NR1, NR2A, and NR2B in the hippocampus of SAE mice. Furthermore, an intrahippocampal or intraperitoneal injection of anti-proBDNF antibody was able to ameliorate LPS-induced cognitive dysfunction and restore the expression of NeuN, Nissl bodies, GluR4, NR1, NR2A, NR2B, and PSD95. These results indicated that treatment with brain delivery by an intrahippocampal and systemic injection of mAb-proBDNF may represent a potential therapeutic strategy for treating patients with SAE.
Collapse
Affiliation(s)
- Yan-Hui Cui
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, China.,Department of Respiratory and Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, China
| | - Shi-Fen Zhou
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, China
| | - Yu Liu
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, China.,Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Shuang Wang
- Department of Medical Research Center and Clinical Laboratory, Xiangya Hospital, Central South University, Changsha, China
| | - Fang Li
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, China
| | - Ru-Ping Dai
- Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Zhao-Lan Hu
- Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Chang-Qi Li
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, China
| |
Collapse
|
15
|
Lin SP, Wei JX, Hu JS, Bu JY, Zhu LD, Li Q, Liao HJ, Lin PY, Ye S, Chen SQ, Chen XH. Artemisinin improves neurocognitive deficits associated with sepsis by activating the AMPK axis in microglia. Acta Pharmacol Sin 2021; 42:1069-1079. [PMID: 33758353 PMCID: PMC8209200 DOI: 10.1038/s41401-021-00634-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Accepted: 02/26/2021] [Indexed: 12/13/2022] Open
Abstract
Sepsis is life-threatening organ dysfunction due to dysregulated systemic inflammatory and immune response to infection, often leading to cognitive impairments. Growing evidence shows that artemisinin, an antimalarial drug, possesses potent anti-inflammatory and immunoregulatory activities. In this study we investigated whether artemisinin exerted protective effect against neurocognitive deficits associated with sepsis and explored the underlying mechanisms. Mice were injected with LPS (750 μg · kg-1 · d-1, ip, for 7 days) to establish an animal model of sepsis. Artemisinin (30 mg · kg-1 · d-1, ip) was administered starting 4 days prior LPS injection and lasting to the end of LPS injection. We showed that artemisinin administration significantly improved LPS-induced cognitive impairments assessed in Morris water maze and Y maze tests, attenuated neuronal damage and microglial activation in the hippocampus. In BV2 microglial cells treated with LPS (100 ng/mL), pre-application of artemisinin (40 μΜ) significantly reduced the production of proinflammatory cytokines (i.e., TNF-α, IL-6) and suppressed microglial migration. Furthermore, we revealed that artemisinin significantly suppressed the nuclear translocation of NF-κB and the expression of proinflammatory cytokines by activating the AMPKα1 pathway; knockdown of AMPKα1 markedly abolished the anti-inflammatory effects of artemisinin in BV2 microglial cells. In conclusion, atemisinin is a potential therapeutic agent for sepsis-associated neuroinflammation and cognitive impairment, and its effect is probably mediated by activation of the AMPKα1 signaling pathway in microglia.
Collapse
Affiliation(s)
- Shao-Peng Lin
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Jue-Xian Wei
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Jia-Song Hu
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Jing-Yi Bu
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Li-Dong Zhu
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Qi Li
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Hao-Jun Liao
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Pei-Yi Lin
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Shan Ye
- Department of Geriatrics, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Sheng-Qiang Chen
- Institute of Neuroscience, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China
| | - Xiao-Hui Chen
- Department of Emergency, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510260, China.
| |
Collapse
|
16
|
Abstract
Objectives: Expound upon priorities for basic/translational science identified in a recent paper by a group of experts assigned by the Society of Critical Care Medicine and the European Society of Intensive Care Medicine. Data Sources: Original paper, search of the literature. Study Selection: By several members of the original task force with specific expertise in basic/translational science. Data Extraction: None. Data Synthesis: None. Conclusions: In the first of a series of follow-up reports to the original paper, several members of the original task force with specific expertise provided a more in-depth analysis of the five identified priorities directly related to basic/translational science. This analysis expounds on what is known about the question and what was identified as priorities for ongoing research. It is hoped that this analysis will aid the development of future research initiatives.
Collapse
|
17
|
Bonfante S, Joaquim L, Fileti ME, Giustina AD, de Souza Goldim MP, Danielski LG, Cittadin E, De Carli RJ, de Farias BX, Engel NA, da Rosa N, Fortunato JJ, Giridharan V, Scaini G, Rezin GT, Generoso J, de Bitencourt RM, Terra S, Barichello T, Petronilho F. Stanniocalcin 1 Inhibits the Inflammatory Response in Microglia and Protects Against Sepsis-Associated Encephalopathy. Neurotox Res 2021; 39:119-132. [PMID: 33025358 DOI: 10.1007/s12640-020-00293-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 09/10/2020] [Accepted: 09/29/2020] [Indexed: 12/23/2022]
Abstract
Sepsis-associated encephalopathy is a serious consequence of sepsis, triggered by the host response against an infectious agent, that can lead to brain damage and cognitive impairment. Several mechanisms have been proposed in this bidirectional communication between the immune system and the brain after sepsis as neuroinflammation, oxidative stress, and mitochondrial dysfunction. Stanniocalcin-1 (STC-1), an endogen neuroprotective protein, acts as an anti-inflammatory and suppresses superoxide generation through induction of uncoupling proteins (UCPs) in the mitochondria. Here, we demonstrated a protective role of STC-1 on inflammatory responses in vitro, in activated microglia stimulated with LPS, and on neuroinflammation, oxidative stress, and mitochondrial function in the hippocampus of rats subjected to an animal model of sepsis by cecal ligation and puncture (CLP), as well the consequences on long-term memory. Recombinant human STC-1 (rhSTC1) suppressed the pro-inflammatory cytokine production in LPS-stimulated microglia without changing the UCP-2 expression. Besides, rhSTC1 injected into the cisterna magna decreased acute hippocampal inflammation and oxidative stress and increased the activity of complex I and II activity of mitochondrial respiratory chain and creatine kinase at 24 h after sepsis. rhSTC1 was effective in preventing long-term cognitive impairment after CLP. In conclusion, rhSTC1 confers significant neuroprotection by inhibiting the inflammatory response in microglia and protecting against sepsis-associated encephalopathy in rats.
Collapse
Affiliation(s)
- Sandra Bonfante
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Larissa Joaquim
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Maria Eduarda Fileti
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Amanda Della Giustina
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Mariana Pereira de Souza Goldim
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Lucinéia Gainski Danielski
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Evandro Cittadin
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Raquel Jaconi De Carli
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Bianca Xavier de Farias
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Nicole Alessandra Engel
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Naiana da Rosa
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Jucélia Jeremias Fortunato
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Vijayasree Giridharan
- Translational Psychiatry Program, Faillace Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, 77054, USA
| | - Giselli Scaini
- Translational Psychiatry Program, Faillace Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, 77054, USA
| | - Gislaine Tezza Rezin
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Jaqueline Generoso
- Laboratory of Experimental Pathophysiology, Graduate Program in Health Sciences, University of Southern Santa Catarina, Criciúma, SC, Brazil
| | - Rafael Mariano de Bitencourt
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Silvia Terra
- Graduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Tatiana Barichello
- Translational Psychiatry Program, Faillace Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, 77054, USA
- Laboratory of Experimental Pathophysiology, Graduate Program in Health Sciences, University of Southern Santa Catarina, Criciúma, SC, Brazil
| | - Fabricia Petronilho
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes (NEUROIMet), Graduate Program in Health Sciences, University of South Santa Catarina, Tubarão, SC, Brazil.
- Laboratório de Neurobiologia de Processos Inflamatórios e Metabólicos (NEUROIMet), Programa de Pós-graduação em Ciências da Saúde, Universidade do Sul de Santa Catarina, Tubarão, SC, Brazil.
| |
Collapse
|
18
|
Zhang A, Charles EJ, Xing J, Sawyer RG, Yang Z. Pulsed Ultrasound of the Spleen Prolongs Survival of Rats With Severe Intra-abdominal Sepsis. J Surg Res 2020; 259:97-105. [PMID: 33279849 DOI: 10.1016/j.jss.2020.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 09/06/2020] [Accepted: 11/01/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND The spleen is an important contributor to the uncontrolled, excessive release of proinflammatory signals during sepsis that leads to the development of tissue injury and diffuse end-organ dysfunction. Therapeutic pulsed ultrasound (pUS) has been shown to inhibit splenic leukocyte release and reduce cytokine production in other inflammatory disease processes. We hypothesized that pUS treatment inhibits spleen-derived inflammatory responses and increases survival duration in rats with severe intra-abdominal sepsis leading to septic shock. MATERIALS AND METHODS Rats with intra-abdominal sepsis, induced by cecal ligation and incision, underwent abdominal washout, intra-peritoneal administration of cefazolin, and then either no further treatment (control), splenectomy, or pUS of the spleen. Animals were observed for the primary endpoint of survival duration. RESULTS Survival curves were significantly different for all groups (P < 0.01). Median survival increased from 9.5 h in control rats to 19.8 h in pUS rats and 35.0 h in splenectomy rats (P < 0.01). At 4 h after cecal ligation and incision, the pUS group had decreased splenic contraction and leukocyte count (P = 0.03) compared with control, indicating reduced exodus of splenic leukocytes. In addition, elevation in plasma TNF-α and MCP-1 was significantly attenuated in the pUS group (P < 0.05 versus control). Splenic β2 adrenergic receptor levels and phosphorylated Akt were significantly more elevated in the pUS group (P < 0.01 versus control). CONCLUSIONS pUS significantly prolonged the survival duration of rats with severe intra-abdominal sepsis. This treatment may be an effective, noninvasive therapy that dampens detrimental immune responses during septic shock by activating β2 adrenergic receptor-Akt phosphorylation in the cholinergic anti-inflammatory pathway.
Collapse
Affiliation(s)
- Aimee Zhang
- Department of Surgery, University of Virginia Health System, Charlottesville, Virginia
| | - Eric J Charles
- Department of Surgery, University of Virginia Health System, Charlottesville, Virginia
| | - Jinyan Xing
- Department of Surgery, University of Virginia Health System, Charlottesville, Virginia; Department of Critical Care Medicine, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Robert G Sawyer
- Department of Surgery, Western Michigan University, Kalamazoo, Michigan
| | - Zequan Yang
- Department of Surgery, University of Virginia Health System, Charlottesville, Virginia.
| |
Collapse
|
19
|
Trained Innate Immunity by Repeated Low-Dose Lipopolysaccharide Injections Displays Long-Term Neuroprotective Effects. Mediators Inflamm 2020; 2020:8191079. [PMID: 33061831 PMCID: PMC7547335 DOI: 10.1155/2020/8191079] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 09/17/2020] [Accepted: 09/21/2020] [Indexed: 12/20/2022] Open
Abstract
Disrupted immune response is an important feature of many neurodegenerative conditions, including sepsis-associated cognitive impairment. Accumulating evidence has demonstrated that immune memory occurs in microglia, which has a significant impact on pathological hallmarks of neurological diseases. However, it remains unclear whether immune memory can cause subsequent alterations in the brain immune response and affect neurobehavioral outcomes in sepsis survivors. In the present study, mice received daily intraperitoneal injection of low-dose lipopolysaccharide (LPS, 0.1 mg/kg) for three consecutive days to induce immune memory (immune tolerance) and then were subjected to sham operation or cecal ligation and puncture (CLP) 9 months later, followed by a battery of neurobehavioral and biochemical studies. Here, we showed that repeated low-dose LPS injection-induced immune memory protected mice from sepsis-induced cognitive and affective impairments, which were accompanied by significantly decreased brain proinflammatory cytokines and immune response. In conclusion, our study suggests that modulation of brain immune responses by repeated LPS injections confers neuroprotective effects by preventing overactivated immune response in response to subsequent septic insult.
Collapse
|
20
|
Deutschman CS, Hellman J, Roca RF, De Backer D, Coopersmith CM. The surviving sepsis campaign: basic/translational science research priorities. Intensive Care Med Exp 2020; 8:31. [PMID: 32676795 PMCID: PMC7365694 DOI: 10.1186/s40635-020-00312-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Objectives Expound upon priorities for basic/translational science identified in a recent paper by a group of experts assigned by the Society of Critical Care Medicine and the European Society of Intensive Care Medicine. Data sources Original paper, search of the literature. Study selection This study is selected by several members of the original task force with specific expertise in basic/translational science. Data extraction and data synthesis are not available. Conclusions In the first of a series of follow-up reports to the original paper, several members of the original task force with specific expertise provided a more in-depth analysis of the five identified priorities directly related to basic/translational science. This analysis expounds on what is known about the question and what was identified as priorities for ongoing research. It is hoped that this analysis will aid the development of future research initiatives.
Collapse
Affiliation(s)
- Clifford S Deutschman
- Department of Pediatrics, Hofstra/Northwell School of Medicine and the Feinstein Institute for Medical Research/Elmezzi Graduate School of Molecular Medicine, Manhasset, NY, USA. .,Department of Molecular Medicine, Hofstra/Northwell School of Medicine and the Feinstein Institute for Medical Research/Elmezzi Graduate School of Molecular Medicine, Manhasset, NY, USA.
| | - Judith Hellman
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA, USA
| | - Ricard Ferrer Roca
- Intensive Care Department, Vall d'Hebron University Hospital, Barcelona, Spain.,Shock, Organ Dysfunction and Resuscitation (SODIR) Research Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Daniel De Backer
- Chirec Hospitals, Université Libre de Bruxelles, Brussels, Belgium
| | - Craig M Coopersmith
- Department of Surgery and Emory Critical Care Center, Emory University, Atlanta, GA, USA
| | | |
Collapse
|
21
|
Hydrogen attenuates sepsis-associated encephalopathy by NRF2 mediated NLRP3 pathway inactivation. Inflamm Res 2020; 69:697-710. [PMID: 32350570 DOI: 10.1007/s00011-020-01347-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 03/30/2020] [Accepted: 04/07/2020] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Sepsis-associated encephalopathy (SAE) is a major cause of mortality worldwide. Oxidative stress, inflammatory response and apoptosis participate in the pathogenesis of SAE. Nuclear factor erythroid 2-related factor 2 (Nrf2) and nucleotide-binding oligomerization domain-like receptor containing pyrin domain 3 (NLRP3) pathway is involved in oxidative stress and inflammatory response. We reported that hydrogen gas protected against sepsis in wild-type (WT) but not Nrf2 knockout (KO) mice. Therefore, it is vital to identify the underlying cause of hydrogen gas treatment of sepsis-associated encephalopathy. METHODS SAE was induced in WT and Nrf2 KO mice by cecal ligation and puncture (CLP). As a NLRP3 inflammasome inhibitor, MCC950 (50 mg/kg) was administered by intraperitoneal (i.p.) injection before operation. Hydrogen gas (H2)-rich saline solution (5 mL/kg) was administered by i.p. injection at 1 h and 6 h after sham and CLP operations. Brain tissue was collected to assess the NLRP3 and Nrf2 pathways by western blotting, reverse transcription-polymerase chain reaction (RT-PCR) and immunofluorescence. RESULTS SAE increased NLRP3 and Nrf2 expression in microglia. MCC950 inhibited SAE-induced NLRP3 expression, interleukin (IL)-1β and IL-18 cytokine release, neuronal apoptosis and mitochondrial dysfunction. SAE increased NLRP3 and caspase-1 expression in WT mice compared to Nrf2 KO mice. Hydrogen increased Nrf2 expression and inhibited the SAE-induced expression of NLRP3, caspase-1, cytokines IL-1β and IL-18, neuronal apoptosis, and mitochondrial dysfunction in WT mice but not Nrf2 KO mice. CONCLUSION SAE increased NLRP3 and Nrf2 expression in microglia. Hydrogen alleviated inflammation, neuronal apoptosis and mitochondrial dysfunction via inhibiting Nrf2-mediated NLRP3 pathway.
Collapse
|
22
|
Yang YL, Liu M, Cheng X, Li WH, Zhang SS, Wang YH, Du GH. Myricitrin blocks activation of NF-κB and MAPK signaling pathways to protect nigrostriatum neuron in LPS-stimulated mice. J Neuroimmunol 2019; 337:577049. [PMID: 31526918 DOI: 10.1016/j.jneuroim.2019.577049] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 09/02/2019] [Accepted: 09/02/2019] [Indexed: 01/02/2023]
Abstract
Myricitrin, a bioactive and natural flavonoids, is well known for its anti-inflammatory and antioxidant properties. However, the anti-neuroinflammation and possible mechanism has not been fully elucidated. Therefore, the present study was to investigate the possible mechanism of its neuroprotection and anti-neuroinflammation in the nigrostriatum of LPS-stimulated mice. The results showed that myricitrin improved neuron injury and raised the expressions of PSD-95 protein and TH protein in the nigrostriatum of LPS-stimulated mice. In addition, myricitrin decreased the production of pro-inflammatory factors including IL-1β, IL-6 and TNFα, decreased the level of chemokine MCP-1, and suppressed the expressions of COX-2 and iNOS. Meanwhile, myricitrin suppressed HMGB1, TLR4, and MyD88 expression in the nigrostriatum of LPS-stimulated mice. Furthermore, myricitrin inhibited NF-κB and MAPK signaling pathways activated by LPS. In conclusion, our studies suggest that myricitrin blocks activation of protects NF-κB and MAPK signaling pathways to nigrostiatum neuron from injury in LPS-stimulated mice and is beneficial to treatment nigrostriatum inflammation of PD.
Collapse
Affiliation(s)
- Ying-Lin Yang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Man Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Xiao Cheng
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Wei-Han Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Shan-Shan Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Yue-Hua Wang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Guan-Hua Du
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China; Beijing Key Laboratory of Drug Target Identification and New Drug Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| |
Collapse
|