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Chen Z, Zhong C, Fan L, Shang H, Xiao L, Wang W, Guo R, Fan B, Li J, Li B. Nonstructural protein 14 of PDCoV promotes complement C3 expression via the activation of p38-MAPK-C/EBP pathway. Vet Microbiol 2024; 295:110137. [PMID: 38851153 DOI: 10.1016/j.vetmic.2024.110137] [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: 03/13/2024] [Revised: 05/28/2024] [Accepted: 06/02/2024] [Indexed: 06/10/2024]
Abstract
Porcine deltacoronavirus (PDCoV) is an emergent enteric coronavirus, primarily inducing diarrhea in swine, particularly in nursing piglets, with the additional potential for zoonotic transmission to humans. Despite the significant impact of PDCoV on swine populations, its pathogenic mechanisms remain incompletely understood. Complement component 3 (C3) plays a pivotal role in the prevention of viral infections, however, there are no reports concerning the influence of C3 on the proliferation of PDCoV. In this study, we initially demonstrated that PDCoV is capable of activating the C3 and eliciting inflammatory responses. The overexpression of C3 significantly suppressed PDCoV replication, while inhibition of C3 expression facilitated PDCoV replication. We discovered that nonstructural proteins Nsp7, Nsp14, and M, considerably stimulated C3 expression, particularly Nsp14, through activation of the p38-MAPK-C/EBP-β pathway. The N7-MTase constitutes a significant functional domain of the non-structural protein Nsp14, which is more obvious to upregulate C3. Furthermore, functional mutants of the N7-MTase domain suggested that the D44 and T135 of N7-Mtase constituted a pivotal amino acid site to promote C3 expression. This provides fresh insights into comprehending how the virus manipulates the host immune response and suggests potential antiviral strategies against PDCoV.
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Affiliation(s)
- Zhuoqi Chen
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China
| | - Chunyan Zhong
- Biological Engineering Department, Southwest Guizhou Vocational and Technical College for Nationalities, Xingyi 562400, China
| | - Liyuan Fan
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China
| | - Hongqi Shang
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China
| | - Li Xiao
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China
| | - Wei Wang
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China
| | - Rongli Guo
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China
| | - Baochao Fan
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China; Institute of Life Sciences, School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou 225009, China; Guotai (Taizhou) Center of Technology Innovation for Veterinary Biologicals, Taizhou 225300, China
| | - Jizong Li
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China; Institute of Life Sciences, School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou 225009, China; Guotai (Taizhou) Center of Technology Innovation for Veterinary Biologicals, Taizhou 225300, China.
| | - Bin Li
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology Ministry of Agriculture, Nanjing 210014, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, China; Institute of Life Sciences, School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou 225009, China; Guotai (Taizhou) Center of Technology Innovation for Veterinary Biologicals, Taizhou 225300, China.
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Yao Q, Long C, Yi P, Zhang G, Wan W, Rao X, Ying J, Liang W, Hua F. C/EBPβ: A transcription factor associated with the irreversible progression of Alzheimer's disease. CNS Neurosci Ther 2024; 30:e14721. [PMID: 38644578 PMCID: PMC11033503 DOI: 10.1111/cns.14721] [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: 11/15/2023] [Revised: 03/20/2024] [Accepted: 03/27/2024] [Indexed: 04/23/2024] Open
Abstract
BACKGROUND Alzheimer's disease (AD) is a neurodegenerative disorder distinguished by a swift cognitive deterioration accompanied by distinctive pathological hallmarks such as extracellular Aβ (β-amyloid) peptides, neuronal neurofibrillary tangles (NFTs), sustained neuroinflammation, and synaptic degeneration. The elevated frequency of AD cases and its proclivity to manifest at a younger age present a pressing challenge in the quest for novel therapeutic interventions. Numerous investigations have substantiated the involvement of C/EBPβ in the progression of AD pathology, thus indicating its potential as a therapeutic target for AD treatment. AIMS Several studies have demonstrated an elevation in the expression level of C/EBPβ among individuals afflicted with AD. Consequently, this review predominantly delves into the association between C/EBPβ expression and the pathological progression of Alzheimer's disease, elucidating its underlying molecular mechanism, and pointing out the possibility that C/EBPβ can be a new therapeutic target for AD. METHODS A systematic literature search was performed across multiple databases, including PubMed, Google Scholar, and so on, utilizing predetermined keywords and MeSH terms, without temporal constraints. The inclusion criteria encompassed diverse study designs, such as experimental, case-control, and cohort studies, restricted to publications in the English language, while conference abstracts and unpublished sources were excluded. RESULTS Overexpression of C/EBPβ exacerbates the pathological features of AD, primarily by promoting neuroinflammation and mediating the transcriptional regulation of key molecular pathways, including δ-secretase, apolipoprotein E4 (APOE4), acidic leucine-rich nuclear phosphoprotein-32A (ANP32A), transient receptor potential channel 1 (TRPC1), and Forkhead BoxO (FOXO). DISCUSSION The correlation between overexpression of C/EBPβ and the pathological development of AD, along with its molecular mechanisms, is evident. Investigating the pathways through which C/EBPβ regulates the development of AD reveals numerous multiple vicious cycle pathways exacerbating the pathological progression of the disease. Furthermore, the exacerbation of pathological progression due to C/EBPβ overexpression and its molecular mechanism is not limited to AD but also extends to other neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS), Parkinson's disease (PD), and multiple sclerosis (MS). CONCLUSION The overexpression of C/EBPβ accelerates the irreversible progression of AD pathophysiology. Additionally, C/EBPβ plays a crucial role in mediating multiple pathways linked to AD pathology, some of which engender vicious cycles, leading to the establishment of feedback mechanisms. To sum up, targeting C/EBPβ could hold promise as a therapeutic strategy not only for AD but also for other degenerative diseases.
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Affiliation(s)
- Qing Yao
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Chubing Long
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Pengcheng Yi
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Guangyong Zhang
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Wei Wan
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Xiuqin Rao
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Jun Ying
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
| | - Weidong Liang
- Department of AnesthesiologyThe First Affiliated Hospital of Gannan Medical UniversityGanzhouJiangxi ProvinceChina
| | - Fuzhou Hua
- Department of AnesthesiologyThe Second Affiliated Hospital of Nanchang UniversityNanchang CityJiangxi ProvinceChina
- Key Laboratory of Anesthesiology of Jiangxi ProvinceNanchang CityJiangxi ProvinceChina
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Liang W, Wei R, Zhu X, Li J, Lin A, Chen J, Wu W, Jie Q. Downregulation of HMGB1 carried by macrophage-derived extracellular vesicles delays atherosclerotic plaque formation through Caspase-11-dependent macrophage pyroptosis. Mol Med 2024; 30:38. [PMID: 38493291 PMCID: PMC10943908 DOI: 10.1186/s10020-023-00753-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: 04/02/2023] [Accepted: 11/02/2023] [Indexed: 03/18/2024] Open
Abstract
BACKGROUND Macrophage-derived extracellular vesicle (macrophage-EV) is highly studied for its regulatory role in atherosclerosis (AS). Our current study tried to elucidate the possible role of macrophage-EV loaded with small interfering RNA against high-mobility group box 1 (siHMGB1) affecting atherosclerotic plaque formation. METHODS In silico analysis was performed to find critical factors in mouse atherosclerotic plaque formation. EVs secreted by RAW 264.7 cells were collected by ultracentrifugation and characterized, followed by the preparation of macrophage-EV-loaded siHMGB1 (macrophage-EV/siHMGB1). ApoE-/- mice were used to construct an AS mouse model by a high-fat diet, followed by injection of macrophage-EV/siHMGB1 to assess the in vivo effect of macrophage-EV/siHMGB1 on AS mice. RAW264.7 cells were subjected to ox-LDL, LPS or macrophage-EV/siHMGB1 for analyzing the in vitro effect of macrophage-EV/siHMGB1 on macrophage pyrophosis and inflammation. RESULTS In silico analysis found that HMGB1 was closely related to the development of AS. Macrophage-EV/siHMGB could inhibit the release of HMGB1 from macrophages to outside cells, and the reduced HMGB1 release could inhibit foam cell formation. Besides, macrophage-EV/siHMGB also inhibited the LPS-induced Caspase-11 activation, thus inhibiting macrophage pyroptosis and preventing atherosclerotic plaque formation. CONCLUSION Our results proved that macrophage-EV/siHMGB could inhibit foam cell formation and suppress macrophage pyroptosis, finally preventing atherosclerotic plaque formation in AS mice.
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Affiliation(s)
- Weijie Liang
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China
| | - Ruibin Wei
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China
| | - Xingxing Zhu
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China
| | - Jinliang Li
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China
| | - Aiwen Lin
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China
| | - Jun Chen
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China
| | - Wen Wu
- Department of Endocrinology, Guangdong Geriatrics Institute, Guangdong Academy of Medical Sciences, Guangdong Provincial People's Hospital, No. 106, Zhongshan Second Road, Yuexiu District, Guangzhou, 510080, Guangdong Province, People's Republic of China.
| | - Qiang Jie
- Department of Cardiology, Panyu Central Hospital, Cardiovascular Institute of Panyu District, No. 8, Fuyu East Road, Qiaonan Street, Panyu District, Guangzhou, 511400, Guangdong Province, People's Republic of China.
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Ren Q, Liu Z, Wu L, Yin G, Xie X, Kong W, Zhou J, Liu S. C/EBPβ: The structure, regulation, and its roles in inflammation-related diseases. Biomed Pharmacother 2023; 169:115938. [PMID: 38000353 DOI: 10.1016/j.biopha.2023.115938] [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: 09/06/2023] [Revised: 11/08/2023] [Accepted: 11/21/2023] [Indexed: 11/26/2023] Open
Abstract
Inflammation, a mechanism of the human body, has been implicated in many diseases. Inflammatory responses include the release of inflammatory mediators by activating various signaling pathways. CCAAT/enhancer binding protein β (C/EBPβ), a transcription factor in the C/EBP family, contains the leucine zipper (bZIP) domain. The expression of C/EBPβ is mediated at the transcriptional and post-translational levels, such as phosphorylation, acetylation, methylation, and SUMOylation. C/EBPβ has been involved in inflammatory responses by mediating several signaling pathways, such as MAPK/NF-κB and IL-6/JAK/STAT3 pathways. C/EBPβ plays an important role in the pathological development of inflammation-related diseases, such as osteoarthritis, pneumonia, hepatitis, inflammatory bowel diseases, and rheumatoid arthritis. Here, we comprehensively discuss the structure and biological effects of C/EBPβ and its role in inflammatory diseases.
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Affiliation(s)
- Qun Ren
- Department of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Zhaowen Liu
- Department of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Longhuo Wu
- Department of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Guoqiang Yin
- Ganzhou People's Hospital Affiliated to Nanchang University, Ganzhou 341000, China
| | - Xunlu Xie
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Weihao Kong
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Jianguo Zhou
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Shiwei Liu
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China.
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Yang Y, Zhang X, Li D, Fang R, Wang Z, Yun D, Wang M, Wang J, Dong H, Fei Z, Li Q, Liu Z, Shen C, Fei J, Yu M, Behnisch T, Huang F. NRSF regulates age-dependently cognitive ability and its conditional knockout in APP/PS1 mice moderately alters AD-like pathology. Hum Mol Genet 2023; 32:2558-2575. [PMID: 36229920 DOI: 10.1093/hmg/ddac253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 09/19/2022] [Accepted: 10/06/2022] [Indexed: 11/12/2022] Open
Abstract
NRSF/REST (neuron-restrictive silencer element, also known as repressor element 1-silencing transcription factor), plays a key role in neuronal homeostasis as a transcriptional repressor of neuronal genes. NRSF/REST relates to cognitive preservation and longevity of humans, but its specific functions in age-dependent and Alzheimer's disease (AD)-related memory deficits remain unclear. Here, we show that conditional NRSF/REST knockout either in the dorsal telencephalon or specially in neurons induced an age-dependently diminished retrieval performance in spatial or fear conditioning memory tasks and altered hippocampal synaptic transmission and activity-dependent synaptic plasticity. The NRSF/REST deficient mice were also characterized by an increase of activated glial cells, complement C3 protein and the transcription factor C/EBPβ in the cortex and hippocampus. Reduction of NRSF/REST by conditional depletion upregulated the activation of astrocytes in APP/PS1 mice, and increased the C3-positive glial cells, but did not alter the Aβ loads and memory retrieval performances of 6- and 12-month-old APP/PS1 mice. Simultaneously, overexpression of NRSF/REST improved cognitive abilities of aged wild type, but not in AD mice. These findings demonstrated that NRSF/REST is essential for the preservation of memory performance and activity-dependent synaptic plasticity during aging and takes potential roles in the onset of age-related memory impairments. However, while altering the glial activation, NRSF/REST deficiency does not interfere with the Aβ deposits and the electrophysiological and cognitive AD-like pathologies.
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Affiliation(s)
- Yufang Yang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
- School of Basic Medical Sciences, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Xiaoshuang Zhang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Dongxue Li
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
- Department of Endocrinology and Metabolism, School of Medicine, Shanghai Tenth People's Hospital of Tongji University, No. 301 Middle Yanchang Road, Shanghai 200072, China
| | - Rong Fang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Zishan Wang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Di Yun
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Mo Wang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Jinghui Wang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Hongtian Dong
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Zhaoliang Fei
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Ren Ji Hospital, Shanghai Jiao Tong University of Medicine, Shanghai 200240, China
| | - Qing Li
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Zhaolin Liu
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Chenye Shen
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Jian Fei
- Shanghai Engineering Research Center for Model Organisms, Shanghai Model Organisms Center, INC., Shanghai 201203, China
- School of Life Science and Technology, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Mei Yu
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Thomas Behnisch
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
| | - Fang Huang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China
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Nonstructural Protein 1 of Variant PEDV Plays a Key Role in Escaping Replication Restriction by Complement C3. J Virol 2022; 96:e0102422. [PMID: 36037478 PMCID: PMC9517699 DOI: 10.1128/jvi.01024-22] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Zoonotic coronaviruses represent an ongoing threat to public health. The classical porcine epidemic diarrhea virus (PEDV) first appeared in the early 1970s. Since 2010, outbreaks of highly virulent PEDV variants have caused great economic losses to the swine industry worldwide. However, the strategies by which PEDV variants escape host immune responses are not fully understood. Complement component 3 (C3) is considered a central component of the three complement activation pathways and plays a crucial role in preventing viral infection. In this study, we found that C3 significantly inhibited PEDV replication in vitro, and both variant and classical PEDV strains induced high levels of interleukin-1β (IL-1β) in Huh7 cells. However, the PEDV variant strain reduces C3 transcript and protein levels induced by IL-1β compared with the PEDV classical strain. Examination of key molecules of the C3 transcriptional signaling pathway revealed that variant PEDV reduced C3 by inhibiting CCAAT/enhancer-binding protein β (C/EBP-β) phosphorylation. Mechanistically, PEDV nonstructural protein 1 (NSP1) inhibited C/EBP-β phosphorylation via amino acid residue 50. Finally, we constructed recombinant PEDVs to verify the critical role of amino acid 50 of NSP1 in the regulation of C3 expression. In summary, we identified a novel antiviral role of C3 in inhibiting PEDV replication and the viral immune evasion strategies of PEDV variants. Our study reveals new information on PEDV-host interactions and furthers our understanding of the pathogenic mechanism of this virus. IMPORTANCE The complement system acts as a vital link between the innate and the adaptive immunity and has the ability to recognize and neutralize various pathogens. Activation of the complement system acts as a double-edged sword, as appropriate levels of activation protect against pathogenic infections, but excessive responses can provoke a dramatic inflammatory response and cause tissue damage, leading to pathological processes, which often appear in COVID-19 patients. However, how PEDV, as the most severe coronavirus causing diarrhea in piglets, regulates the complement system has not been previously reported. In this study, for the first time, we identified a novel mechanism of a PEDV variant in the suppression of C3 expression, showing that different coronaviruses and even different subtype strains differ in regulation of C3 expression. In addition, this study provides a deeper understanding of the mechanism of the PEDV variant in immune escape and enhanced virulence.
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Zhang MM, Guo MX, Zhang QP, Chen XQ, Li NZ, Liu Q, Cheng J, Wang SL, Xu GH, Li CF, Zhu JX, Yi LT. IL-1R/C3aR signaling regulates synaptic pruning in the prefrontal cortex of depression. Cell Biosci 2022; 12:90. [PMID: 35715851 PMCID: PMC9205119 DOI: 10.1186/s13578-022-00832-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 06/08/2022] [Indexed: 12/25/2022] Open
Abstract
Background Major depressive disorder is characterized by not only monoamine neurotransmitters deficiencies but also persistent neuroinflammation. The complement system is an attractive therapeutic target for various inflammation-related diseases due to its early activation in inflammatory processes. Results In the present study, the dynamic alteration of complement C3 and its receptor C3aR during the occurrence of depression and the mechanism of astrocyte-microglia IL-1R/C3/C3aR on synaptic pruning were investigated. The proteomic analysis firstly showed that chronic stress caused an elevation of C3. GO analysis indicated that complement system-mediated synaptic pruning signaling was involved in depression. The dynamic observation indicated that C3/C3aR was activated in the early onset and throughout the course of depression induced by lipopolysaccharide (LPS) and chronic stress. In contrast, C3aR blockade inhibited the hyperactivation of microglial APT2/DHHC7 palmitoylation cycle, which mediated the translocation of STAT3 and the expression of proinflammatory cytokines. Meanwhile, C3aR blockade also attenuated the synaptic pruning and enhanced the synaptogenesis in the prefrontal cortex of mice. Moreover, the blockade of IL-1R/NF-κB signaling pathway reduced the release of C3 from astrocyte. Conclusions The current study demonstrates that astrocyte-microglia IL-1R/C3/C3aR activation causes the abnormal synaptic pruning in depression, and suggests that the activation of complement C3/C3aR may be particularly helpful in predicting the onset stage of depression. Supplementary Information The online version contains supplementary material available at 10.1186/s13578-022-00832-4.
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Affiliation(s)
- Man-Man Zhang
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Min-Xia Guo
- Research Center of Natural Resources of Chinese Medicinal Materials and Ethnic Medicine, Jiangxi University of Chinese Medicine, Nanchang, 330004, Jiangxi province, People's Republic of China
| | - Qiu-Ping Zhang
- Xiamen Hospital of Traditional Chinese Medicine, Xiamen, 361009, Fujian province, People's Republic of China
| | - Xue-Qin Chen
- The First Affiliated Hospital of Xiamen University, Xiamen, 361003, Fujian province, People's Republic of China
| | - Na-Zhi Li
- Research Center of Natural Resources of Chinese Medicinal Materials and Ethnic Medicine, Jiangxi University of Chinese Medicine, Nanchang, 330004, Jiangxi province, People's Republic of China
| | - Qing Liu
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Jie Cheng
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Shi-Le Wang
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China
| | - Guang-Hui Xu
- Xiamen Medicine Research Institute, Xiamen, 361008, Fujian province, People's Republic of China
| | - Cheng-Fu Li
- Xiamen Hospital of Traditional Chinese Medicine, Xiamen, 361009, Fujian province, People's Republic of China
| | - Ji-Xiao Zhu
- Research Center of Natural Resources of Chinese Medicinal Materials and Ethnic Medicine, Jiangxi University of Chinese Medicine, Nanchang, 330004, Jiangxi province, People's Republic of China.
| | - Li-Tao Yi
- Department of Chemical and Pharmaceutical Engineering, College of Chemical Engineering, Huaqiao University, Xiamen, 361021, Fujian province, People's Republic of China.
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8
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Complement as a powerful "influencer" in the brain during development, adulthood and neurological disorders. Adv Immunol 2021; 152:157-222. [PMID: 34844709 DOI: 10.1016/bs.ai.2021.09.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The complement system was long considered as only a powerful effector arm of the immune system that, while critically protective, could lead to inflammation and cell death if overactivated, even in the central nervous system (CNS). However, in the past decade it has been recognized as playing critical roles in key physiological processes in the CNS, including neurogenesis and synaptic remodeling in the developing and adult brain. Inherent in these processes are the interactions with cells in the brain, and the cascade of interactions and functional consequences that ensue. As a result, investigations of therapeutic approaches for both suppressing excessive complement driven neurotoxicity and aberrant sculpting of neuronal circuits, require broad (and deep) knowledge of the functional activities of multiple components of this highly evolved and regulated system to avoid unintended negative consequences in the clinic. Advances in basic science are beginning to provide a roadmap for translation to therapeutics, with both small molecule and biologics. Here, we present examples of the critical roles of proper complement function in the development and sculpting of the nervous system, and in enabling rapid protection from infection and clearance of dying cells. Microglia are highlighted as important command centers that integrate signals from the complement system and other innate sensors that are programed to provide support and protection, but that direct detrimental responses to aberrant activation and/or regulation of the system. Finally, we present promising research areas that may lead to effective and precision strategies for complement targeted interventions to promote neurological health.
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9
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Li L, Li Y, He B, Li H, Ji H, Wang Y, Zhu Z, Hu Y, Zhou Y, Yang T, Sun C, Yuan Y, Wang Y. HSF1 is involved in suppressing A1 phenotype conversion of astrocytes following spinal cord injury in rats. J Neuroinflammation 2021; 18:205. [PMID: 34530848 PMCID: PMC8444373 DOI: 10.1186/s12974-021-02271-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 09/02/2021] [Indexed: 12/17/2022] Open
Abstract
Background Two activation states of reactive astrocytes termed A1 and A2 subtypes emerge at the lesion sites following spinal cord injury (SCI). A1 astrocytes are known to be neurotoxic that participate in neuropathogenesis, whereas A2 astrocytes have been assigned the neuroprotective activity. Heat shock transcription factor 1 (HSF1) plays roles in protecting cells from stress-induced apoptosis and in controlling inflammatory activation. It is unknown whether HSF1 is involved in suppressing the conversion of A1 astrocytes following SCI. Methods A contusion model of the rat spinal cord was established, and the correlations between HSF1 expression and onset of A1 and A2 astrocytes were assayed by Western blot and immunohistochemistry. 17-AAG, the agonist of HSF1, was employed to treat the primary cultured astrocytes following a challenge by an A1-astrocyte-conditioned medium (ACM) containing 3 ng/ml of IL-1α, 30 ng/ml of TNF-α, and 400 ng/ml of C1q for induction of the A1 subtype. The effects of 17-AAG on the phenotype conversion of astrocytes, as well as underlying signal pathways, were examined by Western blot or immunohistochemistry. Results The protein levels of HSF1 were significantly increased at 4 days and 7 days following rat SCI, showing colocalization with astrocytes. Meanwhile, C3-positive A1 astrocytes were observed to accumulate at lesion sites with a peak at 1 day and 4 days. Distinctively, the S100A10-positive A2 subtype reached its peak at 4 days and 7 days. Incubation of the primary astrocytes with ACM markedly induced the conversion of the A1 phenotype, whereas an addition of 17-AAG significantly suppressed such inducible effects without conversion of the A2 subtype. Activation of HSF1 remarkably inhibited the activities of MAPKs and NFκB, which was responsible for the regulation of C3 expression. Administration of 17-AAG at the lesion sites of rats was able to reduce the accumulation of A1 astrocytes. Conclusion Collectively, these data reveal a novel mechanism of astrocyte phenotype conversion following SCI, and HSF1 plays key roles in suppressing excessive increase of neurotoxic A1 astrocytes. Supplementary Information The online version contains supplementary material available at 10.1186/s12974-021-02271-3.
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Affiliation(s)
- Lilan Li
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China
| | - Yu Li
- Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Bingqiang He
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China
| | - Hui Li
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China
| | - Huiyuan Ji
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China.,Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, 226001, People's Republic of China
| | - Yingjie Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China
| | - Zhenjie Zhu
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, 226001, People's Republic of China
| | - Yuming Hu
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, 226001, People's Republic of China
| | - Yue Zhou
- Department of Rehabilitation Medicine, Affiliated Hospital of Nantong University, Nantong, 226001, People's Republic of China
| | - Ting Yang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China
| | - Chunshuai Sun
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China
| | - Ying Yuan
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China.
| | - Yongjun Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, People's Republic of China.
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10
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Ge J, Zhou Q, Cheng X, Qian J, Yan Q, Wu C, Chen Y, Yang H, Zou J. The protein tyrosine kinase inhibitor, Genistein, delays intervertebral disc degeneration in rats by inhibiting the p38 pathway-mediated inflammatory response. Aging (Albany NY) 2020; 12:2246-2260. [PMID: 32023553 PMCID: PMC7041767 DOI: 10.18632/aging.102743] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 01/07/2020] [Indexed: 12/12/2022]
Abstract
The treatment for intervertebral disc degeneration (IDD) has drawn great attention and recent studies have revealed that the p38 MAPK pathway is a potential therapeutic target for delaying the degeneration of intervertebral discs. In this study, we analyzed a nature-derived protein tyrosine kinase inhibitor, Genistein, and its function in delaying IDD in rats both in vitro and in vivo via the p38 MAPK pathway. Nucleus pulposus cells treated with Genistein showed better function compared with untreated cells. Further study revealed that Genistein could play a protective role in IDD by inhibiting phosphorylation of p38, consequently inhibiting the p38 pathway-mediated inflammatory response. The rat IDD model also demonstrated that Genistein could effectively delay the degeneration of intervertebral disc tissue. The current study reveals new biological functions of Genistein, further demonstrates the effects of the p38 MAPK pathway on intervertebral disc degeneration, and deepens our understanding of the treatment and prevention of IDD.
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Affiliation(s)
- Jun Ge
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Quan Zhou
- Department of Orthopaedic Surgery, The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai'an, Jiangsu 223002, China
| | - Xiaoqiang Cheng
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Jiale Qian
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Qi Yan
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Cenhao Wu
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Yufeng Chen
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Huilin Yang
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
| | - Jun Zou
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China
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11
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Lertsooksawat W, Wongnoppavich A, Chairatvit K. Up-regulation of interferon-stimulated gene 15 and its conjugation machinery, UbE1L and UbcH8 expression by tumor necrosis factor-α through p38 MAPK and JNK signaling pathways in human lung carcinoma. Mol Cell Biochem 2019; 462:51-59. [PMID: 31428903 DOI: 10.1007/s11010-019-03609-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 08/10/2019] [Indexed: 11/30/2022]
Abstract
Interferon-stimulated gene 15 (ISG15) is a member of the family of ubiquitin-like proteins. Similar to ubiquitin, conjugation of ISG15 to cellular proteins requires cascade reactions catalyzed by at least 2 enzymes, UbE1L and UbcH8. Expression of ISG15 and its conjugates is up-regulated in many cancer cells, yet the underlying mechanism of up-regulation is still unclear. In this study, we showed that TNF-α, similar to the response by IFN-β, could directly induce expression of ISG15 and its conjugation machinery, UbE1L and UbcH8, in human lung carcinoma, A549. The early response of their expression was effectively blocked by specific inhibitors of p38 MAPK (SB202190) and JNK (SP600125), but not by B18R, a soluble type-I IFN receptor. In addition, luciferase reporter assay together with serial deletions and site-directed mutagenesis identified a putative C/EBPβ binding element in the ISG15 promoter, which is necessary to the response by TNF-α. Taken together, expression of ISG15 and ISG15 conjugation machinery in cancer cells is directly up-regulated by TNF-α via p38 MAPK and JNK pathways through the activation of C/EBPβ binding element in the ISG15 promoter. This study provides a new insight toward understanding the molecular mechanism of ISG15 system and inflammatory response in cancer progression.
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Affiliation(s)
- Wannee Lertsooksawat
- Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok, 10400, Thailand.,Department of Pharmacology, Faculty of Dentistry, Mahidol University, Bangkok, 10400, Thailand
| | - Ariyaphong Wongnoppavich
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.
| | - Kongthawat Chairatvit
- Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok, 10400, Thailand.
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12
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Lee CM, Aizawa K, Jiang J, Kung SKP, Jain R. JLP-centrosome is essential for the microtubule-mediated nucleocytoplasmic transport induced by extracellular stimuli. SCIENCE ADVANCES 2019; 5:eaav0318. [PMID: 31803841 PMCID: PMC6874495 DOI: 10.1126/sciadv.aav0318] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 07/18/2019] [Indexed: 06/10/2023]
Abstract
JLP belongs to the JIP family whose members serve as scaffolding proteins that link motor proteins and their cargo for intracellular transport. Although JLP is mainly cytoplasmic, it accumulates as a focus in the perinuclear region when stimulated by extracellular stimuli. Focus formation, which changes the nucleus shape and concentrates the nuclear pores, depends on p38MAPK activation and the dynein retrograde motor protein complex. Extracellular stimuli trigger the tethering of PLK1 to the centrosome by JLP, leading to centrosome maturation and microtubule array formation. The centrosome localization domain of JLP is important for the binding of the centrosome and the formation of the JLP focus and the microtubule array. Furthermore, the formation of the JLP focus and the microtubule array is interdependent and important for the transport of NF-κB p65 to the nucleus and its unloading therein. In conclusion, JLP exhibits multiple functions in the nuclear translocation of NF-κB p65.
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Affiliation(s)
- Clement M. Lee
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Ken Aizawa
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Joshua Jiang
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Sam K. P. Kung
- Department of Immunology College of Medicine, Faculty of Health Science, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada
| | - Rinku Jain
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
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13
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Zhao Y, Luo C, Chen J, Sun Y, Pu D, Lv A, Zhu S, Wu J, Wang M, Zhou J, Liao Z, Zhao K, Xiao Q. High glucose-induced complement component 3 up-regulation via RAGE-p38MAPK-NF-κB signalling in astrocytes: In vivo and in vitro studies. J Cell Mol Med 2018; 22:6087-6098. [PMID: 30246940 PMCID: PMC6237571 DOI: 10.1111/jcmm.13884] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 07/24/2018] [Accepted: 08/03/2018] [Indexed: 12/14/2022] Open
Abstract
Diabetes is considered as a risk for cognitive decline, which is characterized by neurodegenerative alteration and innate immunity activation. Recently, complement 3 (C3), the critical central component of complement system, has been reported to play a key role in neurodegenerative alterations under pathological condition. Receptor for advanced glycation end products (RAGE) activation is confirmed to mediate several inflammatory cytokines production. However, whether C3 activation participates in the diabetic neuropathology and whether this process is regulated by RAGE activation remains unknown. The present study aimed to investigate the role of C3 in streptozotocin‐induced diabetic mice and high glucose‐induced primary astrocytes and the underlying modulatory mechanisms. The decreased synaptophysin density and increased C3 deposition at synapses were observed in the diabetic brain compared to the control brain. Furthermore, the elevated C3 was co‐localized with GFAP‐positive astrocytes in the diabetic brain slice in vivo and high glucose‐induced astrocytes culture in vitro. Diabetes/high glucose‐induced up‐regulation of C3 expression at gene, protein and secretion levels, which were attenuated by pre‐treatment with RAGE, p38MAPK and NF‐κB inhibitors separately. These results demonstrate that high glucose induces C3 up‐regulation via RAGE‐ p38MAPK‐NF‐κB signalling in vivo and in vitro, which might be associated with synaptic protein loss.
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Affiliation(s)
- Yuxing Zhao
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Cheng Luo
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Jinliang Chen
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Yue Sun
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Die Pu
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Ankang Lv
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Shiyu Zhu
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Jing Wu
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Meili Wang
- The First People's Hospital of Zunyi, Zunyi, China
| | - Jing Zhou
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Zhiyin Liao
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Kexiang Zhao
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Qian Xiao
- Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
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14
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SEN SATARUPA, DESHMANE SATISHL, KAMINSKI RAFAL, AMINI SHOHREH, DATTA PRASUNK. Non-Metabolic Role of PKM2 in Regulation of the HIV-1 LTR. J Cell Physiol 2017; 232:517-525. [PMID: 27249540 PMCID: PMC5714288 DOI: 10.1002/jcp.25445] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 05/31/2016] [Indexed: 12/31/2022]
Abstract
Identification of cellular proteins, in addition to already known transcription factors such as NF-κB, Sp1, C-EBPβ, NFAT, ATF/CREB, and LEF-1, which interact with the HIV-1 LTR, is critical in understanding the mechanism of HIV-1 replication in monocytes/macrophages. Our studies demonstrate upregulation of pyruvate kinase isoform M2 (PKM2) expression during HIV-1SF162 infection of monocyte/macrophages and reactivation of HIV-1 in U1 cells, a macrophage model of latency. We observed that HIV-1SF162 infection of monocyte/macrophages and reactivation of HIV-1 in U1 cells by PMA resulted in increased levels of nuclear PKM2 compared to PMA-induced U937 cells. Furthermore, there was a significant increase in the nuclear dimeric form of PKM2 in the PMA-induced U1 cells in comparison to PMA-induced U937 cells. We focused on understanding the potential role of PKM2 in HIV-1 LTR transactivation. Chromatin immunoprecipitation (ChIP) analysis in PMA-activated U1 and TZM-bl cells demonstrated the interaction of PKM2 with the HIV-1 LTR. Our studies show that overexpression of PKM2 results in transactivation of HIV-1 LTR-luciferase reporter in U937, U-87 MG, and TZM-bl cells. Using various truncated constructs of the HIV-1 LTR, we mapped the region spanning -120 bp to -80 bp to be essential for PKM2-mediated transactivation. This region contains the NF-κB binding site and deletion of this site attenuated PKM2-mediated activation of HIV-1 LTR. Immunoprecipitation experiments using U1 cell lysates demonstrated a physical interaction between PKM2 and the p65 subunit of NF-κB. These observations demonstrate for the first time that PKM2 is a transcriptional co-activator of HIV-1 LTR. J. Cell. Physiol. 232: 517-525, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- SATARUPA SEN
- Department of Neuroscience, Comprehensive NeuroAIDS Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
- Department of Biology, College of Science and Technology, Philadelphia, Pennsylvania
| | - SATISH L. DESHMANE
- Department of Neuroscience, Comprehensive NeuroAIDS Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - RAFAL KAMINSKI
- Department of Neuroscience, Comprehensive NeuroAIDS Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - SHOHREH AMINI
- Department of Neuroscience, Comprehensive NeuroAIDS Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
- Department of Biology, College of Science and Technology, Philadelphia, Pennsylvania
| | - PRASUN K. DATTA
- Department of Neuroscience, Comprehensive NeuroAIDS Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
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15
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Hernandez-Encinas E, Aguilar-Morante D, Morales-Garcia JA, Gine E, Sanz-SanCristobal M, Santos A, Perez-Castillo A. Complement component 3 (C3) expression in the hippocampus after excitotoxic injury: role of C/EBPβ. J Neuroinflammation 2016; 13:276. [PMID: 27769255 PMCID: PMC5073972 DOI: 10.1186/s12974-016-0742-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 10/04/2016] [Indexed: 02/08/2023] Open
Abstract
Background The CCAAT/enhancer-binding protein β (C/EBPβ) is a transcription factor implicated in the control of proliferation, differentiation, and inflammatory processes mainly in adipose tissue and liver; although more recent results have revealed an important role for this transcription factor in the brain. Previous studies from our laboratory indicated that CCAAT/enhancer-binding protein β is implicated in inflammatory process and brain injury, since mice lacking this gene were less susceptible to kainic acid-induced injury. More recently, we have shown that the complement component 3 gene (C3) is a downstream target of CCAAT/enhancer-binding protein β and it could be a mediator of the proinflammatory effects of this transcription factor in neural cells. Methods Adult male Wistar rats (8–12 weeks old) were used throughout the study. C/EBPβ+/+ and C/EBPβ–/– mice were generated from heterozygous breeding pairs. Animals were injected or not with kainic acid, brains removed, and brain slices containing the hippocampus analyzed for the expression of both CCAAT/enhancer-binding protein β and C3. Results In the present work, we have further extended these studies and show that CCAAT/enhancer-binding protein β and C3 co-express in the CA1 and CA3 regions of the hippocampus after an excitotoxic injury. Studies using CCAAT/enhancer-binding protein β knockout mice demonstrate a marked reduction in C3 expression after kainic acid injection in these animals, suggesting that indeed this protein is regulated by C/EBPβ in the hippocampus in vivo. Conclusions Altogether these results suggest that CCAAT/enhancer-binding protein β could regulate brain disorders, in which excitotoxic and inflammatory processes are involved, at least in part through the direct regulation of C3. Electronic supplementary material The online version of this article (doi:10.1186/s12974-016-0742-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Elena Hernandez-Encinas
- Instituto de Investigaciones Biomédicas, (CSIC-UAM), Arturo Duperier, 4, 28029, Madrid, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 28031, Madrid, Spain
| | - Diana Aguilar-Morante
- Instituto de Investigaciones Biomédicas, (CSIC-UAM), Arturo Duperier, 4, 28029, Madrid, Spain.,Present Address: Departamento de Fisiología Médica y Biofísica, Instituto de Biomedicina de Sevilla, IBiS, (Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla), 41013, Sevilla, Spain
| | - Jose A Morales-Garcia
- Instituto de Investigaciones Biomédicas, (CSIC-UAM), Arturo Duperier, 4, 28029, Madrid, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 28031, Madrid, Spain
| | - Elena Gine
- Departamento de Biología Celular, Facultad de Medicina, UCM, 28040, Madrid, Spain
| | - Marina Sanz-SanCristobal
- Instituto de Investigaciones Biomédicas, (CSIC-UAM), Arturo Duperier, 4, 28029, Madrid, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 28031, Madrid, Spain
| | - Angel Santos
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 28031, Madrid, Spain. .,Departamento de Bioquímica y Biologia Molecular, Facultad de Medicina, UCM, 28040, Madrid, Spain.
| | - Ana Perez-Castillo
- Instituto de Investigaciones Biomédicas, (CSIC-UAM), Arturo Duperier, 4, 28029, Madrid, Spain. .,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 28031, Madrid, Spain.
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16
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Napier BA, Brubaker SW, Sweeney TE, Monette P, Rothmeier GH, Gertsvolf NA, Puschnik A, Carette JE, Khatri P, Monack DM. Complement pathway amplifies caspase-11-dependent cell death and endotoxin-induced sepsis severity. J Exp Med 2016; 213:2365-2382. [PMID: 27697835 PMCID: PMC5068231 DOI: 10.1084/jem.20160027] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 08/25/2016] [Indexed: 01/18/2023] Open
Abstract
Cell death and release of proinflammatory mediators contribute to mortality during sepsis. Specifically, caspase-11-dependent cell death contributes to pathology and decreases in survival time in sepsis models. Priming of the host cell, through TLR4 and interferon receptors, induces caspase-11 expression, and cytosolic LPS directly stimulates caspase-11 activation, promoting the release of proinflammatory cytokines through pyroptosis and caspase-1 activation. Using a CRISPR-Cas9-mediated genome-wide screen, we identified novel mediators of caspase-11-dependent cell death. We found a complement-related peptidase, carboxypeptidase B1 (Cpb1), to be required for caspase-11 gene expression and subsequent caspase-11-dependent cell death. Cpb1 modifies a cleavage product of C3, which binds to and activates C3aR, and then modulates innate immune signaling. We find the Cpb1-C3-C3aR pathway induces caspase-11 expression through amplification of MAPK activity downstream of TLR4 and Ifnar activation, and mediates severity of LPS-induced sepsis (endotoxemia) and disease outcome in mice. We show C3aR is required for up-regulation of caspase-11 orthologues, caspase-4 and -5, in primary human macrophages during inflammation and that c3aR1 and caspase-5 transcripts are highly expressed in patients with severe sepsis; thus, suggesting that these pathways are important in human sepsis. Our results highlight a novel role for complement and the Cpb1-C3-C3aR pathway in proinflammatory signaling, caspase-11 cell death, and sepsis severity.
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Affiliation(s)
- Brooke A Napier
- Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305
| | - Sky W Brubaker
- Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305
| | - Timothy E Sweeney
- Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford University, Stanford, CA 94305
- Institute for Immunity, Transplantation, and Infection, Stanford University, Stanford, CA 94305
| | - Patrick Monette
- Department of Biology, Middlebury College, Middlebury, VT 05753
| | | | - Nina A Gertsvolf
- Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305
| | - Andreas Puschnik
- Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305
| | - Jan E Carette
- Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305
| | - Purvesh Khatri
- Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford University, Stanford, CA 94305
- Institute for Immunity, Transplantation, and Infection, Stanford University, Stanford, CA 94305
| | - Denise M Monack
- Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305
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Khorooshi R, Asgari N, Mørch MT, Berg CT, Owens T. Hypersensitivity Responses in the Central Nervous System. Front Immunol 2015; 6:517. [PMID: 26500654 PMCID: PMC4595775 DOI: 10.3389/fimmu.2015.00517] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 09/22/2015] [Indexed: 12/29/2022] Open
Abstract
Immune-mediated tissue damage or hypersensitivity can be mediated by autospecific IgG antibodies. Pathology results from activation of complement, and antibody-dependent cellular cytotoxicity, mediated by inflammatory effector leukocytes include macrophages, natural killer cells, and granulocytes. Antibodies and complement have been associated to demyelinating pathology in multiple sclerosis (MS) lesions, where macrophages predominate among infiltrating myeloid cells. Serum-derived autoantibodies with predominant specificity for the astrocyte water channel aquaporin-4 (AQP4) are implicated as inducers of pathology in neuromyelitis optica (NMO), a central nervous system (CNS) demyelinating disease where activated neutrophils infiltrate, unlike in MS. The most widely used model for MS, experimental autoimmune encephalomyelitis, is an autoantigen-immunized disease that can be transferred to naive animals with CD4+ T cells, but not with antibodies. By contrast, NMO-like astrocyte and myelin pathology can be transferred to mice with AQP4–IgG from NMO patients. This is dependent on complement, and does not require T cells. Consistent with clinical observations that interferon-beta is ineffective as a therapy for NMO, NMO-like pathology is significantly reduced in mice lacking the Type I IFN receptor. In MS, there is evidence for intrathecal synthesis of antibodies as well as blood–brain barrier (BBB) breakdown, whereas in NMO, IgG accesses the CNS from blood. Transfer models involve either direct injection of antibody and complement to the CNS, or experimental manipulations to induce BBB breakdown. We here review studies in MS and NMO that elucidate roles for IgG and complement in the induction of BBB breakdown, astrocytopathy, and demyelinating pathology. These studies point to significance of T-independent effector mechanisms in neuroinflammation.
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Affiliation(s)
- Reza Khorooshi
- Department of Neurobiology Research, Institute for Molecular Medicine, University of Southern Denmark , Odense , Denmark
| | - Nasrin Asgari
- Department of Neurobiology Research, Institute for Molecular Medicine, University of Southern Denmark , Odense , Denmark ; Department of Neurology, Vejle Hospital , Vejle , Denmark
| | - Marlene Thorsen Mørch
- Department of Neurobiology Research, Institute for Molecular Medicine, University of Southern Denmark , Odense , Denmark
| | - Carsten Tue Berg
- Department of Neurobiology Research, Institute for Molecular Medicine, University of Southern Denmark , Odense , Denmark
| | - Trevor Owens
- Department of Neurobiology Research, Institute for Molecular Medicine, University of Southern Denmark , Odense , Denmark
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Lutzenberger M, Burwinkel M, Riemer C, Bode V, Baier M. Ablation of CCAAT/Enhancer-Binding Protein Delta (C/EBPD): Increased Plaque Burden in a Murine Alzheimer's Disease Model. PLoS One 2015; 10:e0134228. [PMID: 26230261 PMCID: PMC4521790 DOI: 10.1371/journal.pone.0134228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Accepted: 07/07/2015] [Indexed: 11/18/2022] Open
Abstract
Alzheimer's disease (AD) and prion diseases carry a significant inflammatory component. The astrocytic overexpression of CCAAT/enhancer-binding protein delta (C/EBPD) in prion- and AD-affected brain tissue prompted us to study the role of this transcription factor in murine model systems of these diseases. Ablation of C/EBPD had neither in the AD model (APP/PS1double transgenic mice) nor in the prion model (scrapie-infected C57BL/6 mice) an influence on overt clinical symptoms. Moreover, the absence of C/EBPD did not affect the extent of the disease-related gliosis. However, C/EBPD-deficient APP/PS1 double transgenic mice displayed significantly increased amyloid beta (Abeta) plaque burdens while amyloid precursor protein (APP) expression and expression of genes involved in beta amyloid transport and turnover remained unchanged. Gene expression analysis in mixed glia cultures demonstrated a strong dependency of complement component C3 on the presence of C/EBPD. Accordingly, C3 mRNA levels were significantly lower in brain tissue of C/EBPD-deficient mice. Vice versa, C3 expression in U-373 MG cells increased upon transfection with a C/EBPD expression vector. Taken together, our data indicate that a C/EBPD-deficiency leads to increased Abeta plaque burden in AD model mice. Furthermore, as shown in vivo and in vitro, C/EBPD is an important driver of the expression of acute phase response genes like C3 in the amyloid-affected CNS.
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Affiliation(s)
- Manuel Lutzenberger
- Research Group Proteinopathies/Neurodegenerative Diseases, Centre for Biological Threats and Special Pathogens (ZBS6), Robert Koch-Institut, Berlin, Germany
| | - Michael Burwinkel
- Research Group Proteinopathies/Neurodegenerative Diseases, Centre for Biological Threats and Special Pathogens (ZBS6), Robert Koch-Institut, Berlin, Germany
- * E-mail:
| | - Constanze Riemer
- Research Group Proteinopathies/Neurodegenerative Diseases, Centre for Biological Threats and Special Pathogens (ZBS6), Robert Koch-Institut, Berlin, Germany
| | - Victoria Bode
- Research Group Proteinopathies/Neurodegenerative Diseases, Centre for Biological Threats and Special Pathogens (ZBS6), Robert Koch-Institut, Berlin, Germany
| | - Michael Baier
- Research Group Proteinopathies/Neurodegenerative Diseases, Centre for Biological Threats and Special Pathogens (ZBS6), Robert Koch-Institut, Berlin, Germany
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19
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Pulido-Salgado M, Vidal-Taboada JM, Saura J. C/EBPβ and C/EBPδ transcription factors: Basic biology and roles in the CNS. Prog Neurobiol 2015; 132:1-33. [PMID: 26143335 DOI: 10.1016/j.pneurobio.2015.06.003] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 05/08/2015] [Accepted: 06/16/2015] [Indexed: 02/01/2023]
Abstract
CCAAT/enhancer binding protein (C/EBP) β and C/EBPδ are transcription factors of the basic-leucine zipper class which share phylogenetic, structural and functional features. In this review we first describe in depth their basic molecular biology which includes fascinating aspects such as the regulated use of alternative initiation codons in the C/EBPβ mRNA. The physical interactions with multiple transcription factors which greatly opens the number of potentially regulated genes or the presence of at least five different types of post-translational modifications are also remarkable molecular mechanisms that modulate C/EBPβ and C/EBPδ function. In the second part, we review the present knowledge on the localization, expression changes and physiological roles of C/EBPβ and C/EBPδ in neurons, astrocytes and microglia. We conclude that C/EBPβ and C/EBPδ share two unique features related to their role in the CNS: whereas in neurons they participate in memory formation and synaptic plasticity, in glial cells they regulate the pro-inflammatory program. Because of their role in neuroinflammation, C/EBPβ and C/EBPδ in microglia are potential targets for treatment of neurodegenerative disorders. Any strategy to reduce C/EBPβ and C/EBPδ activity in neuroinflammation needs to take into account its potential side-effects in neurons. Therefore, cell-specific treatments will be required for the successful application of this strategy.
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Affiliation(s)
- Marta Pulido-Salgado
- Biochemistry and Molecular Biology Unit, School of Medicine, University of Barcelona, IDIBAPS, Casanova 143, planta 3, 08036 Barcelona, Spain
| | - Jose M Vidal-Taboada
- Biochemistry and Molecular Biology Unit, School of Medicine, University of Barcelona, IDIBAPS, Casanova 143, planta 3, 08036 Barcelona, Spain
| | - Josep Saura
- Biochemistry and Molecular Biology Unit, School of Medicine, University of Barcelona, IDIBAPS, Casanova 143, planta 3, 08036 Barcelona, Spain.
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20
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Lian H, Yang L, Cole A, Sun L, Chiang ACA, Fowler SW, Shim DJ, Rodriguez-Rivera J, Taglialatela G, Jankowsky JL, Lu HC, Zheng H. NFκB-activated astroglial release of complement C3 compromises neuronal morphology and function associated with Alzheimer's disease. Neuron 2014; 85:101-115. [PMID: 25533482 DOI: 10.1016/j.neuron.2014.11.018] [Citation(s) in RCA: 423] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2014] [Indexed: 11/26/2022]
Abstract
Abnormal NFκB activation has been implicated in Alzheimer's disease (AD). However, the signaling pathways governing NFκB regulation and function in the brain are poorly understood. We identify complement protein C3 as an astroglial target of NFκB and show that C3 release acts through neuronal C3aR to disrupt dendritic morphology and network function. Exposure to Aβ activates astroglial NFκB and C3 release, consistent with the high levels of C3 expression in brain tissue from AD patients and APP transgenic mice, where C3aR antagonist treatment rescues cognitive impairment. Therefore, dysregulation of neuron-glia interaction through NFκB/C3/C3aR signaling may contribute to synaptic dysfunction in AD, and C3aR antagonists may be therapeutically beneficial.
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Affiliation(s)
- Hong Lian
- Huffington Center on Aging, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Houston, TX 77030, USA
| | - Li Yang
- Huffington Center on Aging, Houston, TX 77030, USA
| | - Allysa Cole
- Huffington Center on Aging, Houston, TX 77030, USA
| | - Lu Sun
- Huffington Center on Aging, Houston, TX 77030, USA
| | - Angie C-A Chiang
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Stephanie W Fowler
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - David J Shim
- Huffington Center on Aging, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Giulio Taglialatela
- Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Joanna L Jankowsky
- Huffington Center on Aging, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Hui-Chen Lu
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA; Department of Pediatrics, Baylor College of Medicine and the Cain Foundation Laboratories, Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX 77030, USA
| | - Hui Zheng
- Huffington Center on Aging, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA.
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Ko CY, Wang WL, Wang SM, Chu YY, Chang WC, Wang JM. Glycogen synthase kinase-3β-mediated CCAAT/enhancer-binding protein delta phosphorylation in astrocytes promotes migration and activation of microglia/macrophages. Neurobiol Aging 2013; 35:24-34. [PMID: 23993701 DOI: 10.1016/j.neurobiolaging.2013.07.021] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 07/17/2013] [Accepted: 07/22/2013] [Indexed: 11/15/2022]
Abstract
Alzheimer's disease is neuropathologically characterized by the accumulation of amyloid-β protein into senile plaques that are sites of chronic inflammation involving reactive microglia, astrocytes, and proinflammatory molecules, such as interleukin-1β and tumor necrosis factor-α. The human CCAAT/enhancer-binding protein (CEBP) delta (CEBPD) is known to be induced in many inflammation-related diseases. In Alzheimer's disease, this protein is responsive to amyloid-β and proinflammatory cytokines in astrocytes. However, the functional role of CEBPD in astrocytes remains largely unclear. In this study, we show that CEBPD is upregulated by interleukin-1β through the mitogen-activated protein kinase p38 (MAPKp38) signaling pathway and phosphorylated by glycogen synthase kinase (GSK)-3β at Ser167 in astrocytes. CEBPD in astrocytes is associated with microglia activation and migration in amyloid precursor protein transgenic mice (AppTg) mice. We further identified that the monocyte chemotactic protein-1, a chemoattractive factor, and migration factors matrix metalloproteinase-1 and -3 are responsive to GSK3β-mediated CEBPD Ser167 phosphorylation. Our results revealed the novel regulation of LiCl on astrocytes and that GSK3β-mediated CEBPD phosphorylation in astrocytes plays an important role in the activation of microglia.
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Affiliation(s)
- Chiung-Yuan Ko
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan; Department of Pharmacology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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22
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Fields J, Ghorpade A. C/EBPβ regulates multiple IL-1β-induced human astrocyte inflammatory genes. J Neuroinflammation 2012; 9:177. [PMID: 22818222 PMCID: PMC3464795 DOI: 10.1186/1742-2094-9-177] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 07/20/2012] [Indexed: 01/19/2023] Open
Abstract
Background CCAAT enhancer-binding protein (C/EBP)β regulates gene expression in multiple organ systems and cell types, including astrocytes in the central nervous system (CNS). Inflammatory stimuli, interleukin (IL)-1β, tumor necrosis factor-α, human immunodeficiency virus (HIV)-1 and lipopolysaccharide induce astrocyte C/EBPβ expression. C/EBPβ is detectable in brains of Alzheimer’s disease (AD), Parkinson’s disease (PD) and HIV-1-associated dementia (HAD) patients, yet little is known about how C/EBPβ contributes to astrocyte gene regulation during neuroinflammation. Methods The expression of 92 human inflammation genes was compared between IL-1β-treated primary human astrocytes and astrocytes transfected with C/EBPβ-specific small interfering (si)RNA prior to IL-1β treatment for 12 h. Transcripts altered by > two-fold compared to control were subjected to one-way analysis of variance and Newman-Keuls post-test for multiple comparisons. Expression of two genes, cyclooxygenase-2 (COX-2) and bradykinin receptor B2 (BDKRB2) was further confirmed in additional human astrocyte donors. Astrocytes were treated with mitogen-activated protein kinase-selective inhibitors, then with IL-1β for 12 or 24 h followed by COX-2 and BDKRB2, expression analyses. Results IL-1β altered expression of 29 of 92 human inflammation genes by at least two-fold in primary human astrocytes in 12 h. C/EBPβ knockdown affected expression of 17 out of 29 IL-1β-regulated genes by > 25%. Two genes relevant to neuroinflammation, COX-2 and BDKRB2, were robustly decreased and increased, respectively, in response to C/EBPβ knockdown, and expression was confirmed in two additional donors. COX-2 and BDKRB2 mRNA remained altered in siRNA-transfected astrocytes at 12, 24 or 72 h. Inhibiting p38 kinase (p38K) activation blocked IL-1β-induced astrocyte COX-2 mRNA and protein expression, but not IL-1β-induced astrocyte BDKRB2 expression. Inhibiting extracellular-regulated kinase (ERK)1/2 activation blocked IL-1β-induced BDKRB2 mRNA expression while increasing COX-2 expression. Conclusion These data support an essential role for IL-1β in the CNS and identify new C/EBPβ functions in astrocytes. Additionally, this work suggests p38K and ERK1/2 pathways may regulate gene expression in a complementary manner to fine tune the IL-1β-mediated astrocyte inflammatory response. Delineating a role for C/EBPβ and other involved transcription factors in human astrocyte inflammatory response may lead to effective therapies for AD, PD, HAD and other neurological disorders.
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Affiliation(s)
- Jerel Fields
- University of North Texas Health Science Center, Camp Bowie Blvd, 3500, Fort Worth, TX, USA
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23
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He Z, Cui P, Ye C, Ma WY, Bode A, Dong Z. Analysis of the role of p38 MAP kinase in epidermal growth factor-induced JB6 Cl41 cell transformation by cDNA array. Gene 2012; 497:71-8. [PMID: 22301268 DOI: 10.1016/j.gene.2011.12.054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2011] [Revised: 11/28/2011] [Accepted: 12/22/2011] [Indexed: 12/01/2022]
Abstract
To further explore the mechanism of p38 MAP kinase in regulation of JB6 Cl41 cell transformation. cDNA array was employed to scan the differential expression genes between DN-p38 cells and CMV-neo JB6 Cl41 cells after EGF stimuli. We found that up-expression genes including oncogenes and tumor suppressor genes, p53-associated protein, transcription repressors, apoptosis-associated genes, and growth arrest and DNA damage-inducible protein 153 were detected in DN-p38 cells, but low expression in CMV-neo JB6 Cl41 cells after EGF treatment. Meanwhile, some proto-oncogenes, such as c-Myc, and signal transducer and activator of transcription 1 (STAT1) were lowly expressed in EGF-stimulated DN-p38 cells, but had relatively high expression level in CMV-neo JB6 Cl41 cells under the same stimuli. Four of the differential expression genes were further confirmed by quantitative RT-PCR analysis. Our results indicate that p38 MAP kinase is involved in EGF-induced JB6 Cl41 cell transformation through effecting on more genes expression levels including transcription factors, proto-oncogene, apoptosis-related genes and growth arrest genes.
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Affiliation(s)
- Zhiwei He
- China-America Cancer Research Institute, Guangdong Medical College, Dongguan 523808, PR China.
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Abstract
The third component of human complement (C3) plays a central role in innate immune function as its activation is required to trigger classical as well as alternative complement pathways. In this study, we have observed that sera from patients chronically infected with hepatitis C virus (HCV) displayed significantly lower C3 levels than sera from healthy individuals. Liver biopsy specimens from the same patients also exhibited lower C3 mRNA expression than liver tissues from healthy donors. C3 mRNA level was reduced in hepatocytes upon infection with cell culture-grown HCV genotype 1a or 2a in vitro. Further analysis suggested that HCV core protein displayed a weak repression of C3 promoter activity by downregulating the transcription factor farnesoid X receptor (FXR). On the other hand, HCV NS5A protein strongly downregulated C3 promoter activity at the basal level or in the presence of interleukin-1β (IL-1β) as an inducer. In addition, the expression of the transcription factor CAAT/enhancer binding protein beta (C/EBP-β), which binds to the IL-1/IL-6 response element in the C3 promoter, was inhibited in liver biopsy specimens. Furthermore, expression of C/EBP-β was reduced in hepatocytes infected with cell culture-grown HCV, as well as in hepatocytes transfected with the NS5A genomic region of HCV. Together, these results underscore the role of HCV NS5A protein in impairing innate immune function.
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