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Guo M, Zhang J, Li M, Zhang X, Wu Y. NLRC3 negatively regulates Pasteurella multocida-induced NF-κB signaling in rabbits. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2024; 150:105078. [PMID: 37820760 DOI: 10.1016/j.dci.2023.105078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 10/08/2023] [Accepted: 10/08/2023] [Indexed: 10/13/2023]
Abstract
Pasteurella multocida (P. multocida) is a significant zoonotic pathogen that has the ability to infect various animals. The inflammatory response caused by P. multocida and the negative regulatory mechanism are not completely understood. NOD-like receptor family CARD-containing 3 (NLRC3), an intracellular member of the NLR family, has been reported as a negative regulator in human. In this study, we aimed to explore the role of rabbit NLRC3 (rNLRC3) in P. multocida infection. Our findings revealed a negative correlation between the expression of rNLRC3 and inflammatory cytokines during P. multocida infection. The expression of rNLRC3 was reduced at the initial stage of P. multocida infection and then recovered. Furthermore, rNLRC3 significantly inhibited the activation of NF-κB by reducing phosphorylation and nuclear import of p65 in response to P. multocida infection. Additionally, overexpression of rNLRC3 attenuated the expression of pro-inflammatory cytokines IL-1β, IL-6, IL-8, and TNF-α. Moreover, we demonstrated that rNLRC3 diminished NF-κB activation by interacting with rTRAF4 and rTRAF6. Overexpression of rNLRC3 promoted P. multocida proliferation, while P. multocida proliferation decreased after knockdown of rNLRC3. We also found that the NACHT-LRR domain is a functional domain of rNLRC3 that regulates the NF-κB pathway. Our study suggests that rNLRC3 negatively regulates P. multocida-induced NF-κB signaling in rabbits. It can serve as a checkpoint to prevent dysfunctional inflammation.
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Affiliation(s)
- Mengjiao Guo
- Jiangsu Co-Innovation Center for Prevention of Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Jiaqi Zhang
- Jiangsu Co-Innovation Center for Prevention of Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Mingtao Li
- Jiangsu Co-Innovation Center for Prevention of Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Xiaorong Zhang
- Jiangsu Co-Innovation Center for Prevention of Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China.
| | - Yantao Wu
- Jiangsu Co-Innovation Center for Prevention of Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture & Agri-Product Safety, Yangzhou University (JIRLAAPS), Yangzhou, 225009, China.
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2
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Zhou Y, Yu S, Zhang W. NOD-like Receptor Signaling Pathway in Gastrointestinal Inflammatory Diseases and Cancers. Int J Mol Sci 2023; 24:14511. [PMID: 37833958 PMCID: PMC10572711 DOI: 10.3390/ijms241914511] [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: 08/23/2023] [Revised: 09/15/2023] [Accepted: 09/23/2023] [Indexed: 10/15/2023] Open
Abstract
Nucleotide-binding and oligomerization domain (NOD)-like receptors (NLRs) are intracellular proteins with a central role in innate and adaptive immunity. As a member of pattern recognition receptors (PRRs), NLRs sense specific pathogen-associated molecular patterns, trigger numerous signaling pathways and lead to the secretion of various cytokines. In recent years, cumulative studies have revealed the significant impacts of NLRs in gastrointestinal (GI) inflammatory diseases and cancers. Deciphering the role and molecular mechanism of the NLR signaling pathways may provide new opportunities for the development of therapeutic strategies related to GI inflammatory diseases and GI cancers. This review presents the structures and signaling pathways of NLRs, summarizes the recent advances regarding NLR signaling in GI inflammatory diseases and GI cancers and describes comprehensive therapeutic strategies based on this signaling pathway.
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Affiliation(s)
- Yujie Zhou
- School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China; (Y.Z.); (S.Y.)
| | - Songyan Yu
- School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China; (Y.Z.); (S.Y.)
| | - Wenyong Zhang
- School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China; (Y.Z.); (S.Y.)
- Key University Laboratory of Metabolism and Health of Guangdong, Southern University of Science and Technology, Shenzhen 518055, China
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3
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Chuphal B, Rai U, Roy B. Teleost NOD-like receptors and their downstream signaling pathways: A brief review. FISH AND SHELLFISH IMMUNOLOGY REPORTS 2022; 3:100056. [DOI: 10.1016/j.fsirep.2022.100056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/01/2022] [Accepted: 05/02/2022] [Indexed: 02/08/2023] Open
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Sun D, Xu J, Zhang W, Song C, Gao C, He Y, Shang Y. Negative regulator NLRC3: Its potential role and regulatory mechanism in immune response and immune-related diseases. Front Immunol 2022; 13:1012459. [PMID: 36341336 PMCID: PMC9630602 DOI: 10.3389/fimmu.2022.1012459] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/04/2022] [Indexed: 11/13/2022] Open
Abstract
NLRC3 is a member of the pattern recognition receptors nucleotide-binding oligomerization domain (NOD)-like receptors (NLRs) family, and plays a pivotal regulatory role in modulating the activation of immune cells. In macrophages, NLRC3 inhibits the activation of the NF-κB signaling pathway, the STING/TBK1 signaling pathway, and the formation of the inflammasome. In the context of T cells immune response, NLRC3 prevents the activation of T cells by regulating the function of dendritic cells and directly influencing the function of T cells. Different from other pattern recognition receptors, NLRC3 is more closely associated with regulatory activity than pathogens recognition, it influences the fates of cells, for example, prevents proliferation, promotes apoptosis and inhibits pyroptosis. These cellular functions regulated by NLRC3 are involved in the development processes of a variety of diseases, such as infectious disease, sterile inflammatory diseases, and cancer. However, its characteristics, function and regulatory mechanism in immune response and immune-related diseases have not been addressed fully. In this review, we elaborate the potential roles of NLRC3 from several different levels, include molecular mechanism, cellular functions in the immune-related diseases.
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Affiliation(s)
- Deyi Sun
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiqian Xu
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Jiqian Xu, ; You Shang,
| | - Wanying Zhang
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chaoying Song
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chenggang Gao
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yajun He
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - You Shang
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Anesthesiology and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Jiqian Xu, ; You Shang,
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Chen M, Rong R, Xia X. Spotlight on pyroptosis: role in pathogenesis and therapeutic potential of ocular diseases. J Neuroinflammation 2022; 19:183. [PMID: 35836195 PMCID: PMC9281180 DOI: 10.1186/s12974-022-02547-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 07/05/2022] [Indexed: 11/10/2022] Open
Abstract
Pyroptosis is a programmed cell death characterized by swift plasma membrane disruption and subsequent release of cellular contents and pro-inflammatory mediators (cytokines), including IL‐1β and IL‐18. It differs from other types of programmed cell death such as apoptosis, autophagy, necroptosis, ferroptosis, and NETosis in terms of its morphology and mechanism. As a recently discovered form of cell death, pyroptosis has been demonstrated to be involved in the progression of multiple diseases. Recent studies have also suggested that pyroptosis is linked to various ocular diseases. In this review, we systematically summarized and discussed recent scientific discoveries of the involvement of pyroptosis in common ocular diseases, including diabetic retinopathy, age-related macular degeneration, AIDS-related human cytomegalovirus retinitis, glaucoma, dry eye disease, keratitis, uveitis, and cataract. We also organized new and emerging evidence suggesting that pyroptosis signaling pathways may be potential therapeutic targets in ocular diseases, hoping to provide a summary of overall intervention strategies and relevant multi-dimensional evaluations for various ocular diseases, as well as offer valuable ideas for further research and development from the perspective of pyroptosis.
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Affiliation(s)
- Meini Chen
- Eye Center of Xiangya Hospital, Central South University, Changsha, 410008, Hunan, People's Republic of China.,Hunan Key Laboratory of Ophthalmology, Changsha, 410008, Hunan, People's Republic of China.,National Clinical Research Center for Geriatric Diseases (Xiangya Hospital), Changsha, 410008, Hunan, People's Republic of China
| | - Rong Rong
- Eye Center of Xiangya Hospital, Central South University, Changsha, 410008, Hunan, People's Republic of China.,Hunan Key Laboratory of Ophthalmology, Changsha, 410008, Hunan, People's Republic of China.,National Clinical Research Center for Geriatric Diseases (Xiangya Hospital), Changsha, 410008, Hunan, People's Republic of China
| | - Xiaobo Xia
- Eye Center of Xiangya Hospital, Central South University, Changsha, 410008, Hunan, People's Republic of China. .,Hunan Key Laboratory of Ophthalmology, Changsha, 410008, Hunan, People's Republic of China. .,National Clinical Research Center for Geriatric Diseases (Xiangya Hospital), Changsha, 410008, Hunan, People's Republic of China.
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Das S, D’Souza S, Gorimanipalli B, Shetty R, Ghosh A, Deshpande V. Ocular Surface Infection Mediated Molecular Stress Responses: A Review. Int J Mol Sci 2022; 23:ijms23063111. [PMID: 35328532 PMCID: PMC8952005 DOI: 10.3390/ijms23063111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 12/16/2022] Open
Abstract
Infection mediated ocular surface stress responses are activated as early defense mechanisms in response to host cell damage. Integrated stress responses initiate the host response to different types of infections and modulate the transcription of key genes and translation of proteins. The crosstalk between host and pathogen results in profound alterations in cellular and molecular homeostasis triggering specific stress responses in the infected tissues. The amplitude and variations of such responses are partly responsible for the disease severity and clinical sequelae. Understanding the etiology and pathogenesis of ocular infections is important for early diagnosis and effective treatment. This review considers the molecular status of infection mediated ocular surface stress responses which may shed light on the importance of the host stress-signaling pathways. In this review, we collated literature on the molecular studies of all ocular surface infections and summarize the results from such studies systematically. Identification of important mediators involved in the crosstalk between the stress response and activation of diverse signaling molecules in host ocular surface infection may provide novel molecular targets for maintaining the cellular homeostasis during infection. These targets can be then explored and validated for diagnostic and therapeutic purposes.
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Affiliation(s)
- Samayitree Das
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bangalore 560 099, India;
| | - Sharon D’Souza
- Cornea and Refractive Services, Narayana Nethralaya, Bangalore 560 010, India; (S.D.); (B.G.); (R.S.)
| | - Bhavya Gorimanipalli
- Cornea and Refractive Services, Narayana Nethralaya, Bangalore 560 010, India; (S.D.); (B.G.); (R.S.)
| | - Rohit Shetty
- Cornea and Refractive Services, Narayana Nethralaya, Bangalore 560 010, India; (S.D.); (B.G.); (R.S.)
| | - Arkasubhra Ghosh
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bangalore 560 099, India;
- Correspondence: (A.G.); (V.D.)
| | - Vrushali Deshpande
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bangalore 560 099, India;
- Correspondence: (A.G.); (V.D.)
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7
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Chen D, Song D, Ma Y, Lu W, Qiu J, Wang Y. USP22 promotes pro‑inflammatory responses in Pseudomonas aeruginosa‑induced keratitis by targeting TRAF6. Mol Med Rep 2022; 25:149. [PMID: 35244191 DOI: 10.3892/mmr.2022.12665] [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: 06/26/2019] [Accepted: 11/11/2020] [Indexed: 11/06/2022] Open
Abstract
Pseudomonas aeruginosa (PA)‑induced keratitis is characterized by inflammatory epithelial edema, stromal infiltration, corneal ulceration and can lead to vision loss. The present study aimed to study the effect of ubiquitin‑specific protease 22 (USP22) on PA‑induced keratitis. Using RT‑qPCR and western blotting, significantly increased expression of USP22 was identified in mouse corneas and cultured RAW264.7 cells following PA stimulation. In addition, the results of in vivo experiments, western blot assay and ELISA suggested that the silencing of USP22 attenuated disease progression, downregulated the NF‑κB pathway and suppressed the expression of pro‑inflammatory cytokines following PA stimulation. Notably, it was identified that the expression of tumor necrosis factor receptor‑associated factor 6 (TRAF6) was decreased by silencing of USP22 and USP22 was found to remove lysine 48‑linked poly‑ubiquitination chains from TRAF6 to stabilize TRAF6 expression and these effects were clearly aggravated following PA infection.
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Affiliation(s)
- Di Chen
- Department of Ophthalmology, Second Affiliated Hospital of Shandong First Medical University and Shandong Academy of Medical Sciences, Tai'an, Shandong 271000, P.R. China
| | - Dawei Song
- Department of Ophthalmology, Tai'an City Central Hospital, Tai'an, Shandong 271000, P.R. China
| | - Yibin Ma
- Department of Ophthalmology, Tai'an City Central Hospital, Tai'an, Shandong 271000, P.R. China
| | - Weizhao Lu
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai'an, Shandong 271000, P.R. China
| | - Jianfeng Qiu
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai'an, Shandong 271000, P.R. China
| | - Yi Wang
- Department of Ophthalmology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai'an, Shandong 271000, P.R. China
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8
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Chang MX, Xiong F, Wu XM, Hu YW. The expanding and function of NLRC3 or NLRC3-like in teleost fish: Recent advances and novel insights. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 114:103859. [PMID: 32896535 DOI: 10.1016/j.dci.2020.103859] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/31/2020] [Accepted: 08/31/2020] [Indexed: 06/11/2023]
Abstract
The nucleotide-binding domain and leucine-rich repeat-containing family (NLR) proteins are innate immune sensors which recognize highly conserved pathogen-associated molecular patterns (PAMPs). Mammals have small numbers of NLR proteins, whereas in some species such as in invertebrates and jawless vertebrates, NLRs have expanded into very large families. Nearly 400 NLR proteins are identified in the zebrafish genome. Members of the NLR family can be divided into two functional sub-groups based on their ability to either positively or negatively regulate host immune response or inflammatory signaling cascades. Mammalian NLRC3 has been identified as an inhibitory NLR, and serves as a negative regulator in the NF-κB-mediated inflammatory response, STING-mediated DNA sensing and PI3K-mTOR pathways. Different from mammalian NLRC3, the analysis from genomes or transcriptomes revealed that the expansions of NLRC3 existed in different species of fish. Furthermore, piscine NLRC3-like genes were confirmed to have a negative or positive regulatory function in response to different kinds of pathogen infections and in the production of proinflammatory cytokines. In this review, we summarize recent advances in our understanding of the expanding and function of NLRC3 or NLRC3-like genes in teleost fish, and give our view of important directions for future studies. The knowledge of piscine NLRC3 or expansive NLRC3-like genes-mediated biological functions in homeostasis and diseases will shed new light on the prevention and control of inflammatory and/or infectious diseases.
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Affiliation(s)
- Ming Xian Chang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China.
| | - Fan Xiong
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Xiao Man Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Yi Wei Hu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
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Hu R, Yuan K, Zhou J, Zhang Y, Zheng J, Zhao Y, Huang X, Jin X. Influence of Pseudomonas autoinducer N-3-oxododecanoyl homoserine lactone on human corneal epithelial cells. Exp Biol Med (Maywood) 2020; 246:426-435. [PMID: 33175611 DOI: 10.1177/1535370220969838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The quorum-sensing (QS) signaling-dependent extracellular virulence factors of Pseudomonas aeruginosa can cause infections such as P. aeruginosa keratitis. P. aeruginosa communicates by secreting and sensing small chemical molecules called autoinducers in QS system. The key QS signal molecule, N-3-oxododecanoyl-homoserine lactone (3OC12HSL), can affect the behavior of host cells and initiate immune response. In this report we investigated the influence of 3OC12HSL on human corneal epithelial cells (HCECs) and the mechanisms of 3OC12HSL on activated toll-like receptor 2 (TLR2)-dependent interleukin-8 (IL-8) secretion in HCECs. Cells were cultured under different concentrations of 3OC12HSL. Cell viability was assessed using Crystal violet staining and the cell counting kit-8 assay. We demonstrated the administration of 3OC12HSL decreased HCEC viability and survival in a concentration- and time-dependent manner. At high concentrations, 3OC12HSL rapidly promoted a time-dependent increase in the expressions of TLR2 and TLR4. It was found that the nuclear translocation and expression of nuclear factor-κB (NF-κB) were also increased in response to 3OC12HSL treatment. The significantly elevated expressions of TLR2, TLR4, and NF-κB, encouraged us to further test their mechanisms that cause inflammatory response. Among the inflammatory factors examined (IL-6, IL-8, IL-10, and TNF-α), we found that IL-8 was significantly increased after treatment with 3OC12HSL and its expression was inhibited when TLR2 was specifically blocked or silenced. These results indicated that the QS signaling molecule 3OC12HSL could be recognized by the host innate immune system in HCECs. This recognition then triggered an immune inflammatory response involving the activation of TLR2 and an increase in expression of IL-8. This crosstalk between 3OC12HSL and host immunity in HCECs contributes to the development and progression of P. aeruginosa keratitis.
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Affiliation(s)
- Renjian Hu
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Kelan Yuan
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Jie Zhou
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Yue Zhang
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Jiao Zheng
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Yingying Zhao
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Xiaodan Huang
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Xiuming Jin
- Eye Center, Affiliated Second Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
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Fang H, Wu XM, Hu YW, Song YJ, Zhang J, Chang MX. NLRC3-like 1 inhibits NOD1-RIPK2 pathway via targeting RIPK2. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 112:103769. [PMID: 32634524 DOI: 10.1016/j.dci.2020.103769] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Revised: 05/19/2020] [Accepted: 06/06/2020] [Indexed: 06/11/2023]
Abstract
Both NLRC3 and NOD1 belong to regulatory NLR subfamily based on their best-characterized function. In mammals, NLRC3 was reported to function by attenuating signaling cascades initiated by other families of PRRs. In teleosts, multiple NLRC3-like genes were identified through transcriptome sequencing. However, the functions of many NLRC3-like genes, especially the fish-specific NLRC3-like genes, remain unclear. In the present study, we report the functional characterization of a novel category of NLRC3-like proteins (named as NLRC3-like 1) from the zebrafish, which consists of a fish-specific FISNA, a conserved NACHT and five C-terminal LRRs domains. The expression of zebrafish NLRC3-like 1 was inducible in response to Edwardsiella piscicida infection. During bacterial infection, the in vitro and in vivo studies revealed that zebrafish NLRC3-like 1 overexpression facilitated bacterial growth and dissemination, together with the decreased survival rate of zebrafish larvae infected with E. piscicida. The attenuated response by zebrafish NLRC3-like 1 in response to bacterial infection were characterized by the impaired expression of antibacterial genes, proinflammatory cytokines and Nox genes. Furthermore, zebrafish NLRC3-like 1 interacted with the adaptor protein RIPK2 of NODs signaling via the FISNA (Fish-specific NACHT associated domain) and NACHT domains. However, the interaction between zebrafish NLRC3-like 1 and RIPK2 inhibited the assembly of the NOD1-RIPK2 complex. Importantly, zebrafish NLRC3-like 1 inhibited NOD1-mediated antibacterial activity, NF-κB and MAPK pathways and proinflammatory cytokine production. All together, these results firstly demonstrate that zebrafish NLRC3-like 1 inhibits NOD1-RIPK2 antibacterial pathway via targeting the adaptor protein RIPK2.
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Affiliation(s)
- Hong Fang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; University of Chinese Academy of Sciences, Beijing, China
| | - Xiao Man Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yi Wei Hu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yun Jie Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; University of Chinese Academy of Sciences, Beijing, China
| | - Jie Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Ming Xian Chang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Aquaculture Disease Control, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China; Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China.
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11
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Chen Z, Yang L, Chen L, Li J, Zhang F, Xing Y, Zhao J. miR-190b promotes tumor growth and metastasis via suppressing NLRC3 in bladder carcinoma. FASEB J 2020; 34:4072-4084. [PMID: 31953872 DOI: 10.1096/fj.201901764r] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 12/06/2019] [Accepted: 12/31/2019] [Indexed: 12/11/2022]
Abstract
Bladder cancer is one of the most common urogenital malignancies. However, its pathogenesis, especially molecular mechanisms remain elusive. Thus, understanding the molecular mechanisms underlying bladder cancer is important for the discovery of novel therapeutic paradigms for these diseases. In current study, we found that micro-RNA (miR)-190b is highly expressed in bladder cancer tissues and cells. Overexpression of miR-190b enhanced the proliferation, growth, migration and invasion capabilities, and angiogenesis of bladder cancer cells, whereas downregulation of miR-190b reversed these effects. Target prediction and dual luciferase reporter assays identified NLR family CARD domain containing 3 (NLRC3) as a potential target of miR-190b. Pathway analysis indicated that miR-190b promotes bladder cancer progression via the Wnt/β-catenin and mTOR signaling pathways. Taken together, our findings imply that miR-190b acts as a critical regulator for bladder cancer development by repressing NLRC3 and partly through the Wnt/β-catenin and mTOR pathways. Our study suggests that miR-190b may be served as a potential therapeutic target for bladder cancer treatment.
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Affiliation(s)
- Zhaohui Chen
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Likun Yang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liang Chen
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jin Li
- Department of Urology, The Second Affiliated Hospital of Nanchang University, Nanchang University, Nanchang, China
| | - Futian Zhang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yifei Xing
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jun Zhao
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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12
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Fu Y, Zhan X, Wang Y, Jiang X, Liu M, Yang Y, Huang Y, Du X, Zhong XP, Li L, Ma L, Hu S. NLRC3 expression in dendritic cells attenuates CD4 + T cell response and autoimmunity. EMBO J 2019; 38:e101397. [PMID: 31290162 DOI: 10.15252/embj.2018101397] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 06/07/2019] [Accepted: 06/07/2019] [Indexed: 12/23/2022] Open
Abstract
NOD-like receptor (NLR) family CARD domain containing 3 (NLRC3), an intracellular member of NLR family, is a negative regulator of inflammatory signaling pathways in innate and adaptive immune cells. Previous reports have shown that NLRC3 is expressed in dendritic cells (DCs). However, the role of NLRC3 in DC activation and immunogenicity is unclear. In the present study, we find that NLRC3 attenuates the antigen-presenting function of DCs and their ability to activate and polarize CD4+ T cells into Th1 and Th17 subsets. Loss of NLRC3 promotes pathogenic Th1 and Th17 responses and enhanced experimental autoimmune encephalomyelitis (EAE) development. NLRC3 negatively regulates the antigen-presenting function of DCs via p38 signaling pathway. Vaccination with NLRC3-overexpressed DCs reduces EAE progression. Our findings support that NLRC3 serves as a potential target for treating adaptive immune responses driving multiple sclerosis and other autoimmune disorders.
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Affiliation(s)
- Yuling Fu
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xiaoxia Zhan
- Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yichong Wang
- Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaobing Jiang
- Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Min Liu
- Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yalong Yang
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yulan Huang
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xialin Du
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xiao-Ping Zhong
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,Division of Allergy and Immunology, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Laisheng Li
- Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Li Ma
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Shengfeng Hu
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
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13
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Moon PD, Han NR, Lee JS, Kim HM, Jeong HJ. Ursolic acid downregulates thymic stromal lymphopoietin through the blockade of intracellular calcium/caspase‑1/NF‑κB signaling cascade in HMC‑1 cells. Int J Mol Med 2019; 43:2252-2258. [PMID: 30976816 DOI: 10.3892/ijmm.2019.4144] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 03/20/2019] [Indexed: 11/05/2022] Open
Abstract
Thymic stromal lymphopoietin (TSLP) plays an important role in allergic disorders, including atopic dermatitis and asthma. Ursolic acid (UA) has various pharmacological properties, such as antioxidant, anti‑inflammatory and anticancer. However, the effect of UA on TSLP regulation has not been fully elucidated. The aim of the present study was to analyze how UA regulates the production of TSLP in the human mast cell line HMC‑1. Enzyme‑linked immunosorbent assay, quantitative polymerase chain reaction analysis, western blotting, caspase‑1 assay and fluorescent measurements of intracellular calcium levels were conducted to analyze the regulatory effects of UA. The results revealed that UA inhibited TSLP production and mRNA expression. In addition, UA reduced the activation of nuclear factor‑κB and degradation of IκBα. Caspase‑1 activity was increased by exposure to phorbol myristate acetate plus calcium ionophore, whereas it was reduced by UA. Finally, UA treatment prevented an increase in intracellular calcium levels. These results indicated that UA may be a useful agent for the treatment and/or prevention of atopic and inflammatory diseases, and its effects are likely mediated by TSLP downregulation.
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Affiliation(s)
- Phil-Dong Moon
- Department of Pharmacology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Na-Ra Han
- Department of Pharmacology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jin Soo Lee
- Department of Pharmacology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Hyung-Min Kim
- Department of Pharmacology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Hyun-Ja Jeong
- Department of Food Science and Technology and Research Institute for Basic Science, Hoseo University, Asan, Chungnam 31499, Republic of Korea
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14
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Hu S, Du X, Huang Y, Fu Y, Yang Y, Zhan X, He W, Wen Q, Zhou X, Zhou C, Zhong XP, Yang J, Xiong W, Wang R, Gao Y, Ma L. NLRC3 negatively regulates CD4+ T cells and impacts protective immunity during Mycobacterium tuberculosis infection. PLoS Pathog 2018; 14:e1007266. [PMID: 30133544 PMCID: PMC6122840 DOI: 10.1371/journal.ppat.1007266] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 09/04/2018] [Accepted: 08/08/2018] [Indexed: 02/06/2023] Open
Abstract
NLRC3, a member of the NLR family, has been reported as a negative regulator of inflammatory signaling pathways in innate immune cells. However, the direct role of NLRC3 in modulation of CD4+ T-cell responses in infectious diseases has not been studied. In the present study, we showed that NLRC3 plays an intrinsic role by suppressing the CD4+ T cell phenotype in lung and spleen, including differentiation, activation, and proliferation. NLRC3 deficiency in CD4+ T cells enhanced the protective immune response against Mycobacterium tuberculosis infection. Finally, we demonstrated that NLRC3 deficiency promoted the activation, proliferation, and cytokine production of CD4+ T cells via negatively regulating the NF-κB and MEK-ERK signaling pathways. This study reveals a critical role of NLRC3 as a direct regulator of the adaptive immune response and its protective effects on immunity during M. tuberculosis infection. Our findings also suggested that NLRC3 serves as a potential target for therapeutic intervention against tuberculosis.
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Affiliation(s)
- Shengfeng Hu
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xialin Du
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yulan Huang
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yuling Fu
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yalong Yang
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xiaoxia Zhan
- Department of laboratory medicine, The first Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Wenting He
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Qian Wen
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xinying Zhou
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Chaoying Zhou
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xiao-Ping Zhong
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
- Department of Pediatrics, Division of Allergy and Immunology, Duke University Medical Center, Durham, NC, United States of America
| | - Jiahui Yang
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Wenjing Xiong
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Ruining Wang
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yuchi Gao
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Li Ma
- Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
- * E-mail:
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15
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Ma YY, Zhang GH, Li J, Wang SB, Hu ZM, Zhang CW, Li E. The correlation of NLRC3 expression with the progression and prognosis of hepatocellular carcinoma. Hum Pathol 2018; 82:273-281. [PMID: 30081150 DOI: 10.1016/j.humpath.2018.07.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 07/20/2018] [Accepted: 07/26/2018] [Indexed: 12/12/2022]
Abstract
NLRC3 is a member of the nucleotide-binding domain and leucine-rich repeat (NLR) family protein that plays a role in inflammation and immunity. Although chronic inflammation has been identified as a hallmark of cancer, NLRC3 expression correlation with the development and prognosis of hepatocellular carcinoma (HCC) is unclear. In the present study, we first used Oncomine and OncoLnc database to determine the clinical significance of NLRC3 in HCC. Then we performed quantitative real-time polymerase chain reaction, Western blot, and immunohistochemical staining (IHC) and analyzed the correlation between NLRC3 expression and clinicopathological features of HCC in a Chinese population. We found that high levels of NLRC3 messenger RNA (mRNA) correlated with a favorable clinical outcome; furthermore, expression of NLRC3 was significantly reduced in the cancer tissue in patients compared with noncancerous hepatic tissues. NLRC3 reduction was correlated with Edmondson grade and metastasis. Kaplan-Meier survival analysis revealed that HCC patients with high expression of NLRC3 have a more favorable prognosis compared with those with low expression of NLRC3. We then used short hairpin RNA to knock down NLRC3 expression in HCC cell lines and evaluated its effect on cell proliferation and apoptosis. Suppression of NLRC3 expression promoted cell proliferation and inhibited apoptosis in vitro. Genomic analysis of the OncoLnc database also showed that NLRC3 mRNA level was directly correlated with mRNA levels of inflammasome components caspase-1, IL-1β, and IL-18. Based on our present study, down-regulated expression of NLRC3 may play an important role in cancer progression and prognosis of HCC by acting as a tumor suppressor.
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Affiliation(s)
- Ying-Yu Ma
- State Key Laboratory of Pharmaceutical Biotechnology, Medical School of Nanjing University, Nanjing, Jiangsu 210093, China; Key Laboratory of Gastroenterology of Zhejiang Province, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, China.
| | - Guo-Hai Zhang
- State Key Laboratory of Pharmaceutical Biotechnology, Medical School of Nanjing University, Nanjing, Jiangsu 210093, China
| | - Jingjing Li
- State Key Laboratory of Pharmaceutical Biotechnology, Medical School of Nanjing University, Nanjing, Jiangsu 210093, China
| | - Shi-Bing Wang
- Key Laboratory of Tumor Molecular Diagnosis and Individualized Medicine of Zhejiang Province, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, China
| | - Zhi-Ming Hu
- Department of Hepatobiliary Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, China
| | - Cheng-Wu Zhang
- Department of Hepatobiliary Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, China
| | - Erguang Li
- State Key Laboratory of Pharmaceutical Biotechnology, Medical School of Nanjing University, Nanjing, Jiangsu 210093, China; Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu 210093, China.
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16
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Zhu J, Gan X, Ao Q, Shen X, Tan Y, Chen M, Luo Y, Wang H, Jiang H, Li C. Basal polarization of the immune responses to Streptococcus agalactiae susceptible and resistant tilapia (Oreochromis niloticus). FISH & SHELLFISH IMMUNOLOGY 2018; 75:336-345. [PMID: 29454032 DOI: 10.1016/j.fsi.2018.01.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/11/2018] [Accepted: 01/12/2018] [Indexed: 06/08/2023]
Abstract
One of the highest priority areas for improvement is the development of effective strategies for decreasing disease mortality levels in aquaculture production, a better understanding of the components of the fish immune system and their functions in the context of pathogen invasion is needed. Tilapia is the most common fish in South China, and Streptococcus agalactiae has become the most serious disease problem for tilapia industry in China. Here, we profiled gene expression differences between tilapia differing in their susceptibility to S. agalactiae both basally (before infection) and at three early timepoints post-infection (5 h, 50 h, and 7 d). Between group comparisons revealed 5756 unique genes differentially expressed greater than 2-fold at one or more timepoints. And the resistant fish showed much more strong ability in pathogen recognition, antigen presentation, immune activation, while the susceptible fish showed fast activation of apoptosis. Taken together, the immune profiles expand our knowledge for molecular mechanisms for disease resistance, as well as provide solid molecular resources for further identification of the candidate markers for disease-resistant selection and evaluation of disease prevention and treatment options for tilapia industry.
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Affiliation(s)
- Jiajie Zhu
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China; Guangxi University, Nanning, Guangxi 530004, China
| | - Xi Gan
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | - Qiuwei Ao
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | - Xiashuang Shen
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | - Yun Tan
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | - Ming Chen
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | - Yongju Luo
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | - Hui Wang
- Guangxi Academy of Fishery Sciences, Guangxi 530021, China
| | | | - Chao Li
- Marine Science and Engineering College, Qingdao Agricultural University, Qingdao 266109, China.
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17
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NOD-like receptor(s) and host immune responses with Pseudomonas aeruginosa infection. Inflamm Res 2018; 67:479-493. [PMID: 29353310 DOI: 10.1007/s00011-018-1132-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 01/12/2018] [Accepted: 01/16/2018] [Indexed: 01/01/2023] Open
Abstract
INTRODUCTION Molecular mechanisms underlying the interactions between Pseudomonas aeruginosa, the common opportunistic pathogen in cystic fibrosis individuals, and host induce a number of marked inflammatory responses and associate with complex therapeutic problems due to bacterial resistance to antibiotics in chronic stage of infection. METHODS Pseudomonas aeruginosa is recognized by number of pattern recognition receptors (PRRs); NOD-like receptors (NLRs) are a class of PRRs, which can recognize a variety of endogenous and exogenous ligands, thereby playing a critical role in innate immunity. RESULTS NLR activation initiates forming of a multi-protein complex called inflammasome that induces activation of caspase-1 and resulted in cleavage of pro-inflammatory cytokines interleukin (IL)-1β and IL-18. When the IL-1β is secreted excessively, this causes tissue damage and extensive inflammatory responses that are potentially hazardous for the host. CONCLUSIONS Recent evidence has laid out inflammasome-forming NLR far beyond inflammation. This review summarizes current knowledge regarding the various roles played by different NLRs and associated down-signals, either in recognition of P. aeruginosa or may be associated with such bacterial pathogen infection, which may relate to for the complexity of lung diseases caused by P. aeruginosa.
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