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Ren Q, Huang X. The first report of a C-type lectin contains a CLIP domain involved in antibacterial defense in Macrobrachium nipponense. Int J Biol Macromol 2024; 275:133705. [PMID: 38972646 DOI: 10.1016/j.ijbiomac.2024.133705] [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: 05/14/2024] [Revised: 07/02/2024] [Accepted: 07/04/2024] [Indexed: 07/09/2024]
Abstract
We identified a novel C-type lectin (CTL) from Macrobrachium nipponense, designated as Mn-clip-Lec. It consists of 1315 bp with an open reading frame of 1098 bp, encoding a polypeptide of 365 amino acids. Mn-clip-Lec contains 6 exons and 5 introns. Mn-clip-Lec possessed a CLIP domain at the N-terminal and two carbohydrate recognition domains at the C-terminal. Interaction between Mn-clip-Lec and MnLec was found by Yeast two-hybrid analysis. The expressions of Mn-clip-Lec, MnLec, prophenoloxidase (proPO)-activating system-associated genes (MnPPAF, MnPPAE, and MnPO), and antimicrobial peptides (AMPs) (MnALF and MnCRU) were up-regulated after the challenge with Staphylococcus aureus. RNA interference (RNAi)-mediated suppression of the Mn-clip-Lec and MnLec genes in S. aureus-challenged prawns reduced the transcripts of MnPPAF, MnPPAE, MnPO, MnALF and MnCRU. Knockdown of Mn-clip-Lec and MnLec resulted in decrease in PO activity in M. nipponense infected with S. aureus. The recombinant Mn-clip-Lec (rMn-clip-Lec) protein bound all tested bacteria and agglutinated S. aureus. A sugar-binding assay revealed that rMn-clip-Lec could bind to LPS or PGN. rMn-clip-Lec accelerated the clearance of S. aureus in vivo. Our findings suggest that Mn-clip-Lec and its interacting MnLec play important roles in the induction of the proPO system and AMPs expression in M. nipponense during bacterial infection.
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Affiliation(s)
- Qian Ren
- School of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu Province, PR China.
| | - Xin Huang
- Jiangsu Province Engineering Research Center for Aquatic Animals Breeding and Green Efficient Aquacultural Technology, College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, Jiangsu Province, PR China
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2
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Qin L, Qian Q, Chen A, Zhang Y, Tang X, Yin T, Jiang Q, Zhang X, Gao X. Isolation and the pathogenicity characterization of Decapod iridescent virus 1 (DIV1) from diseased Macrobrachium nipponense and its activation on host immune response. FISH & SHELLFISH IMMUNOLOGY 2024; 146:109403. [PMID: 38266793 DOI: 10.1016/j.fsi.2024.109403] [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: 12/12/2023] [Revised: 01/20/2024] [Accepted: 01/21/2024] [Indexed: 01/26/2024]
Abstract
The high morbidity and mortality of Macrobrachium nipponense occurred in several farms in China, with cardinal symptoms of slow swimming, loss of appetite, empty of intestine, reddening of the hepatopancreas and gills. The pathogen has been confirmed as Decapod Iridescent Virus 1 (DIV1), namely DIV1-mn, by molecular epidemiology, histopathological examination, TEM observation, challenge experiment, and viral load detection. Histopathological analysis showed severe damage in hepatopancreas and gills of diseased prawns, exhibited few eosinophilic inclusions and pyknosis, and TEM of diseased prawns revealed that icosahedral virus particles existed in hepatopancreas and gill, which confirmed the disease of the farmed prawns caused by the DIV1 infection. Besides, challenge tests showed LD50 of DIV1 to M. nipponense was determined to be 2.14 × 104 copies/mL, and real-time PCR revealed that M. nipponense had a very high DIV1 load in the hemocytes, gills and hepatopancreas after infection. Furthermore, qRT-PCR was undertaken to investigated the expression of six immune-related genes in DIV1-infected M. nipponense after different time points, and the results revealed UCHL3, Relish, Gly-Cru2, CTL, MyD88 and Hemocyanin were significantly up-regulated in hemocytes, gills and hepatopancreas, which revealed various expression patterns in response to DIV1 infection. This study revealed that DIV1 infection is responsible for the mass mortality of M. nipponense, one of the important crustacean species, indicating its high susceptibility to DIV1. Moreover, this study will contribute to exploring the interaction between the host and DIV1 infection, specifically in terms of understanding how M. nipponense recognizes and eliminates the invading of DIV1.
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Affiliation(s)
- Lijie Qin
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Qieqi Qian
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Anting Chen
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Yingjie Zhang
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Xinzhe Tang
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Tianchi Yin
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Qun Jiang
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Xiaojun Zhang
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Xiaojian Gao
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China.
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Watson A, Agius J, Ackerly D, Beddoe T, Helbig K. The Role of Anti-Viral Effector Molecules in Mollusc Hemolymph. Biomolecules 2022; 12:345. [PMID: 35327536 PMCID: PMC8945852 DOI: 10.3390/biom12030345] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/06/2022] [Accepted: 02/21/2022] [Indexed: 02/04/2023] Open
Abstract
Molluscs are major contributors to the international and Australian aquaculture industries, however, their immune systems remain poorly understood due to limited access to draft genomes and evidence of divergences from model organisms. As invertebrates, molluscs lack adaptive immune systems or 'memory', and rely solely on innate immunity for antimicrobial defence. Hemolymph, the circulatory fluid of invertebrates, contains hemocytes which secrete effector molecules with immune regulatory functions. Interactions between mollusc effector molecules and bacterial and fungal pathogens have been well documented, however, there is limited knowledge of their roles against viruses, which cause high mortality and significant production losses in these species. Of the major effector molecules, only the direct acting protein dicer-2 and the antimicrobial peptides (AMPs) hemocyanin and myticin-C have shown antiviral activity. A better understanding of these effector molecules may allow for the manipulation of mollusc proteomes to enhance antiviral and overall antimicrobial defence to prevent future outbreaks and minimize economic outbreaks. Moreover, effector molecule research may yield the description and production of novel antimicrobial treatments for a broad host range of animal species.
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Affiliation(s)
- Angus Watson
- Department of Physiology, Anatomy, and Microbiology, La Trobe University, Melbourne, VIC 3086, Australia; (A.W.); (J.A.)
| | - Jacinta Agius
- Department of Physiology, Anatomy, and Microbiology, La Trobe University, Melbourne, VIC 3086, Australia; (A.W.); (J.A.)
| | - Danielle Ackerly
- Department of Animal, Plant and Soil Science, La Trobe University, Melbourne, VIC 3086, Australia;
| | - Travis Beddoe
- Department of Animal, Plant and Soil Science, La Trobe University, Melbourne, VIC 3086, Australia;
| | - Karla Helbig
- Department of Physiology, Anatomy, and Microbiology, La Trobe University, Melbourne, VIC 3086, Australia; (A.W.); (J.A.)
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Characterization and functional analysis of tandem threonine containing C-type lectin (Thr-Lec) from the ridgetail white prawn Exopalaemon carinicauda. FISH AND SHELLFISH IMMUNOLOGY REPORTS 2021; 2:100018. [DOI: 10.1016/j.fsirep.2021.100018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/15/2021] [Accepted: 07/06/2021] [Indexed: 11/21/2022] Open
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Zheng J, Ni M, Mao Y, Su Y. Antibacterial activity of four recombinant carbohydrate recognition domain proteins identified from the kuruma shrimp Marsupenaeus japonicus. Int J Biol Macromol 2021; 191:746-752. [PMID: 34592219 DOI: 10.1016/j.ijbiomac.2021.09.138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 11/16/2022]
Abstract
The carbohydrate recognition domain (CRD) is the key component of C-type lectins (CTLs) with the capacity to recognize and eliminate invading pathogens. Herein, the recombinant proteins of four CRDs identified from the kuruma shrimp, Marsupenaeus japonicus, were produced and purified by an Escherichia coli expression system and affinity chromatography. Bacterial binding and antibacterial assays showed that the four CRDs displayed various bacterial binding and antibacterial activities against different bacteria. Among the four recombinant CRDs, His-CRD2-3 exhibited the broadest spectrum of bacterial binding and antibacterial activities against gram-negative bacteria (Vibrio parahaemolyticus, V. alginolyticus and V. harveyi) and gram-positive bacteria (Staphylococcus aureus and Micrococcus lysodeikticus). Moreover, the four recombinant CRDs showed different capacities to regulate the expression of several immune effector genes (MjCTL3, MjCTL4, MjCTL, Mjily and Mjsty), among which His-CRD2-3 displayed broader and stronger inductive effects on these immune effector genes. This study indicated that the four CRDs participated in immune defense by binding and killing bacteria and regulating the transcription of other immune effector genes. In addition, our results suggested that His-CRD2-3 might be a promising agent for the prevention and treatment of bacteriosis.
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Affiliation(s)
- Jinbin Zheng
- School of Marine Sciences, Ningbo University, Ningbo 315211, China.
| | - Mengqi Ni
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
| | - Yong Mao
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China; College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - Yongquan Su
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
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6
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Liu Y, Su Y, Zhang A, Cui Z. A C-Type Lectin Highly Expressed in Portunus trituberculatus Intestine Functions in AMP Regulation and Prophenoloxidase Activation. Antibiotics (Basel) 2021; 10:antibiotics10050541. [PMID: 34066980 PMCID: PMC8151143 DOI: 10.3390/antibiotics10050541] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 04/29/2021] [Accepted: 04/30/2021] [Indexed: 12/30/2022] Open
Abstract
A C-type lectin (PtCLec2) from Portunus trituberculatus was identified for characterization of its role in defense and innate immunity. PtCLec2 contains a single carbohydrate-recognition domain (CRD) with a conserved QPD motif, which was predicted to have galactose specificity. The mRNA expression of PtCLec2 was predominantly detected in intestine and increased rapidly and significantly upon pathogen challenge. The recombinant PtCLec2 (rPtCLec2) could bind various microorganisms and PAMPs with weak binding ability to yeast and PGN. It agglutinated the tested Gram-negative bacteria (Vibrio alginolyticus and Pseudomonas aeruginosa), Gram-positive bacteria (Staphylococcus aureus and Micrococcus luteus), and rabbit erythrocytes in the presence of exogenous Ca2+, and these agglutination activities were suppressed by LPS, d-galactose, and d-mannose. Further, rPtCLec2 enhanced phagocytosis and clearance of V. alginolyticus, and displayed inhibitory activities against the tested bacteria. Knockdown of PtCLec2 decreased the transcription of two phagocytosis genes (PtArp and PtMyosin), three prophenoloxidase (proPO) system-related genes (PtPPAF, PtcSP1, and PtproPO), six antimicrobial peptides (AMPs) (PtALF4-7, PtCrustin1, and PtCrustin3), and PtRelish but upregulated the expression levels of PtJNK, PtPelle, and PtTLR. These results collectively indicate that PtCLec2 might perform its immune recognition function via binding and agglutination, and mediate pathogen elimination via regulating hemocyte phagocytosis, AMP synthesis, and proPO activation.
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Affiliation(s)
- Yuan Liu
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (Y.S.); (A.Z.)
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Correspondence: ; Tel.: +86-532-8289-8637
| | - Yue Su
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (Y.S.); (A.Z.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ao Zhang
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (Y.S.); (A.Z.)
| | - Zhaoxia Cui
- School of Marine Science, Ningbo University, Ningbo 315211, China;
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Qiu W, Chen F, Chen R, Li S, Zhu X, Xiong M, Wang KJ. A New C-Type Lectin Homolog SpCTL6 Exerting Immunoprotective Effect and Regulatory Role in Mud Crab Scylla paramamosain. Front Immunol 2021; 12:661823. [PMID: 33897708 PMCID: PMC8062930 DOI: 10.3389/fimmu.2021.661823] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 03/16/2021] [Indexed: 11/15/2022] Open
Abstract
C-type lectin (CTL), a well-known immune-related molecule, has received more and more attention due to its diverse functions, especially its important role in development and host defense of vertebrate and invertebrate. Since the research on crab CTLs is still lack, we screened a new CTL homolog, named SpCTL6 from mud crab Scylla paramamosain. The full-length cDNA sequence of SpCTL6 was 738 bp with a 486 bp of ORF, and the deduced amino acids were 161 aa. SpCTL6 was predicted to have a 17 aa signal peptide and its mature peptide was 144 aa (MW 16.7 kDa) with pI value of 5.22. It had typical CTL structural characteristics, such as a single C-type lectin-like domain, 4 conserved cysteines, similar tertiary structure to that of vertebrate CTLs and a mutated Ca2+ binding motif Gln-Pro-Thr (QPT), clustering into the same branch as the crustacean CTLs. SpCTL6 was highly expressed in the entire zoeal larval stages and widely distributed in adult crab tissues with the highest transcription level in testis. During the molting process of juvenile crabs, the expression level of SpCTL6 was remarkably increased after molting. SpCTL6 could be significantly upregulated in two larval stages (Z1 and megalopa) and adult crab testis under immune challenges. Recombinant SpCTL6 (rSpCTL6) was successfully obtained from eukaryotic expression system. rSpCTL6 exhibited binding activity with PAMPs (LPS, lipoteichoic acid, peptidoglycan, and glucan) and had a broad spectrum bacterial agglutination activity in a Ca2+-dependent manner. In addition, rSpCTL6 could enhance the encapsulation activity of hemocytes and has no cytotoxic effect on hemocytes. Although rSpCTL6 had no bactericidal activity on Vibrio alginolyticus, rSpCTL6 treatment could significantly reduce the bacterial endotoxin level in vitro and greatly improved the survival of S. paramamosain under V. alginolyticus infection in vivo. The immunoprotective effect of rSpCTL6 might be due to the regulatory role of rSpCTL6 in immune-related genes and immunological parameters. Our study provides new information for understanding the immune defense of mud crabs and would facilitate the development of effective strategies for mud crab aquaculture disease control.
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Affiliation(s)
- Wanlei Qiu
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
| | - Fangyi Chen
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.,State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.,Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
| | - Roushi Chen
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
| | - Shuang Li
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
| | - Xuewu Zhu
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
| | - Ming Xiong
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.,State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.,Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
| | - Ke-Jian Wang
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.,State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.,Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China
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8
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Huang Y, Ren Q. Innate immune responses against viral pathogens in Macrobrachium. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 117:103966. [PMID: 33338519 DOI: 10.1016/j.dci.2020.103966] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/27/2020] [Accepted: 12/09/2020] [Indexed: 06/12/2023]
Abstract
Some members of genus Macrobrachium are important economically prawns and valuable objects for studying the innate immune defense mechanism of crustaceans. Studies have focused on immune responses against bacterial and fungal infections and have expanded to include antiviral immunity over the past two decades. Similar to all living organisms, prawns are exposed to viruses, including white spot syndrome virus, Macrobrachium rosenbergii nodavirus, and Decapod iridescent virus 1 and develop effective defense mechanisms. Here, we review current understanding of the antiviral host defense in two species of Macrobrachium. The main antiviral defense of Macrobrachium is the activation of intracellular signaling cascades, leading to the activation of cellular responses (apoptosis) and humoral responses (immune-related signaling pathways, antimicrobial and antiviral peptides, lectins, and prophenoloxidase-activating system).
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Affiliation(s)
- Ying Huang
- College of Oceanography, Hohai University, 1 Xikang Road, Nanjing, Jiangsu, 210098, China
| | - Qian Ren
- College of Marine Science and Engineering, Nanjing Normal University, 1 Wenyuan Road, Nanjing, Jiangsu, 210023, China.
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9
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He J, Shen C, Liang H, Fang X, Lu J. Antimicrobial properties and immune-related gene expression of a C-type lectin isolated from Pinctada fucata martensii. FISH & SHELLFISH IMMUNOLOGY 2020; 105:330-340. [PMID: 32712228 DOI: 10.1016/j.fsi.2020.07.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 07/01/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]
Abstract
C-type lectins are carbohydrate-binding proteins that play important roles in the innate immune response to pathogen infections. Here, multi-step high performance liquid chromatography (HPLC), combined with mass spectrometry (MS), was used to isolate and identify proteins with antibacterial activity from the serum of Pinctada fucata martensii. Using this method, we obtained a novel isoform of C-type lectin (PmCTL-1). PmCTL-1 strongly inhibited gram-positive bacteria. The complete cDNA sequence of PmCTL-1 was 636 bp in length, and encoded a protein 149 amino acids long, containing a typical carbohydrate recognition domain (CRD). A phylogenetic analysis based on a multiple sequence alignment indicated that PmCTL-1 was highly similar to C-type lectins from other mollusks. Fluorescent quantitative real-time PCR analysis showed that PmCTL-1 mRNA was strongly upregulated in the mantle of healthy P.f. martensii, but was expressed only at low levels in the gill, gonad, hepatopancreas, adductor muscle, and hemocytes. PmCTL-1 expression levels in the mantle and hemocytes increased significantly in response to bacterial stimulation. This study provides a valuable framework for further explorations of innate immunity and the immune response in mollusks.
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Affiliation(s)
- Junjun He
- Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, PR China; Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, PR China
| | - Chenghao Shen
- Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, PR China; Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, PR China
| | - Haiying Liang
- Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, PR China; Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, PR China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, Guangdong, PR China; Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen, Guangdong, PR China.
| | - Xiaochen Fang
- Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, PR China
| | - Jinzhao Lu
- Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, PR China
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Identification and functional characterization of a novel C-type lectin from the kuruma shrimp, Marsupenaeus japonicus. Biochem Biophys Res Commun 2020; 530:547-553. [PMID: 32747089 DOI: 10.1016/j.bbrc.2020.07.067] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 07/15/2020] [Indexed: 01/19/2023]
Abstract
C-type lectins (CTLs) are immune molecules that are crucial to the invertebrate innate immune system with the primary function of recognizing invading pathogens. In the present study, a novel CTL was cloned from Marsupenaeus japonicus (MjCTL), and its tissue distribution and expression patterns over time in response to white spot syndrome virus (WSSV) and Vibrio parahaemolyticus were further investigated. The open reading frame (ORF) of MjCTL was 513 bp and encoded a polypeptide of 170 amino acids, which contained a signal peptide and a carbohydrate recognition domain (CRD) that are typical for CTLs. MjCTL was primarily expressed in the hepatopancreas and weakly expressed in hemocytes, gill, stomach, intestine, heart, muscle and eyestalk. The expression level of MjCTL in the hepatopancreas was dramatically increased at 48 h post-injection with WSSV at a dosage of 1 × 105 virions. Glutathione-S-transferase (GST) pull-down assays showed that MjCTL could directly bind to several WSSV envelope proteins, including VP19, VP24, VP26 and VP28. Moreover, MjCTL displayed antibacterial activity against V. parahaemolyticus. Our results indicated that MjCTL exhibited multiple functions in innate immune response against pathogens.
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11
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Qin N, Sun H, Lu M, Wang J, Tang T, Liu F. A single von Willebrand factor C-domain protein acts as an extracellular pattern-recognition receptor in the river prawn Macrobrachium nipponense. J Biol Chem 2020; 295:10468-10477. [PMID: 32532819 DOI: 10.1074/jbc.ra120.013270] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 06/02/2020] [Indexed: 01/08/2023] Open
Abstract
The single von Willebrand factor C-domain proteins (SVWCs) are mainly found in arthropods. Their expression may be regulated by several environmental stresses, including nutritional status and bacterial and viral infections. However, the underlying regulatory mechanism is unclear. In the present study, we identified a member of the SVWC family from the river prawn Macrobrachium nipponense as a soluble and bacteria-inducible pattern-recognition receptor (designated MnSVWC). In vitro, recombinant MnSVWC exhibited pronounced binding and Ca2+-dependent agglutinating abilities against diverse microbes, including Gram-negative bacteria (i.e. Escherichia coli and Aeromonas victoria), Gram-positive bacteria (Staphylococcus aureus and Bacillus subtilis), and yeast (Pichia pastoris). ELISA assays revealed that recombinant MnSVWC recognizes a broad range of various pathogen-associated molecular patterns (PAMPs) and has high affinity to lipopolysaccharide and lysine-type and diaminopimelic acid-type peptidylglycan and d-galactose and low affinity to d-mannan and β-1,3-glucan. Mutant MnSVWCP57A with an impaired Glu-Pro-Asn (EPN) motif displayed reduced affinity to all these PAMPs to varying extent. Moreover, MnSVWC bound to the surface of hemocytes and promoted their phagocytic activity and clearance of invasive bacteria. RNAi-mediated MnSVWC knockdown in prawn reduced the ability to clear invading bacteria, but did not block the activities of the Toll pathway or the arthropod immune deficiency (IMD) pathway, or the expression of antimicrobial peptide genes. These results indicate that MnSVWC functions as an extracellular pattern-recognition receptor in M. nipponense that mediates cellular immune responses by recognizing PAMPs, agglutinating invasive microbes, and promoting phagocytosis in hemocytes.
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Affiliation(s)
- Nan Qin
- The Key Laboratory of Zoological Systematics and Application, College of Life Sciences, Hebei University, Baoding, China
| | - Hehe Sun
- The Key Laboratory of Zoological Systematics and Application, College of Life Sciences, Hebei University, Baoding, China
| | - Meike Lu
- The Key Laboratory of Zoological Systematics and Application, College of Life Sciences, Hebei University, Baoding, China
| | - Jianhui Wang
- Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Ting Tang
- The Key Laboratory of Zoological Systematics and Application, College of Life Sciences, Hebei University, Baoding, China .,Institute of Life Science and Green Development, Hebei University, Baoding, China
| | - Fengsong Liu
- The Key Laboratory of Zoological Systematics and Application, College of Life Sciences, Hebei University, Baoding, China .,Institute of Life Science and Green Development, Hebei University, Baoding, China
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12
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Su Y, Liu Y, Gao F, Cui Z. A novel C-type lectin with a YPD motif from Portunus trituberculatus (PtCLec1) mediating pathogen recognition and opsonization. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 106:103609. [PMID: 31923433 DOI: 10.1016/j.dci.2020.103609] [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: 11/15/2019] [Revised: 12/30/2019] [Accepted: 01/05/2020] [Indexed: 06/10/2023]
Abstract
C-type lectins are a superfamily of Ca2+-dependent carbohydrate-recognition proteins that function as pattern recognition receptors (PRRs) in innate immune system. In this study, a new C-type lectin was identified from the swimming crab Portunus trituberculatus (PtCLec1). The full-length cDNA of PtCLec1 was 873 bp encoding 176 amino acids. The predicted PtCLec1 protein contained a signal peptide and a single carbohydrate-recognition domain with a special YPD motif. The PtCLec1 transcripts were mainly detected in hepatopancreas and its relative expression levels were significantly up-regulated after the challenges of Vibrio alginolyticus, Micrococcus luteus and Pichia pastoris. The recombinant PtCLec1 (rPtCLec1) could bind all the tested pathogen-associated molecular patterns (PAMPs), including lipopolysaccharides (LPS), peptidoglycan (PGN) and glucan (GLU), and microorganisms, including V. alginolyticus, V. parahaemolyticus, Pseudomonas aeruginosa, Staphylococcus aureus, M. luteus and P. pastoris. It also exhibited strong activity to agglutinate bacteria and yeast in a Ca2+-dependent manner, and such agglutinating activity could be inhibited by d-galactose and LPS. Moreover, rPtCLec1 revealed antimicrobial activity against the tested Gram-negative (V. alginolyticus, V. parahaemolyticus and P. aeruginosa) and Gram-positive bacteria (S. aureus and M. luteus), and promoted the clearance of V. alginolyticus in vivo and hemocyte phagocytosis in vitro. Knockdown of PtCLec1 could down-regulate the expression of phagocytosis-related genes, but enhance the expression levels of prophenoloxidase (proPO) system-related genes, mannose-binding lectin (MBL), antimicrobial peptides (AMPs), MyD88 and Relish. All these results indicate that PtCLec1 might act as a PRR in immune recognition and an opsonin in pathogen elimination.
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Affiliation(s)
- Yue Su
- CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yuan Liu
- CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China.
| | - Fengtao Gao
- CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Zhaoxia Cui
- School of Marine Science, Ningbo University, Zhejiang, Ningbo, 315211, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China
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Li D, Nie H, Jahan K, Yan X. Expression analyses of C-type lectins (CTLs) in Manila clam under cold stress provide insights for its potential function in cold resistance of Ruditapes philippinarum. Comp Biochem Physiol C Toxicol Pharmacol 2020; 230:108708. [PMID: 31945500 DOI: 10.1016/j.cbpc.2020.108708] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 01/03/2020] [Accepted: 01/11/2020] [Indexed: 02/04/2023]
Abstract
Manila clam Ruditapes philippinarum is an economically and scientifically important marine bivalve species. C-type lectin acts as a pattern-recognition receptor (PPR), plays a crucial role in the innate immunity of invertebrates, and involves in pathogen recognition, and cell-cell interaction. In this study, six different types of C-type lectin genes, CTL-1, CTL-2, CTL-3, CTL-4, CTL-5, and CTL-6, were identified from the R. philippinarum. CTL amino acid sequence was highly conserved compare to other invertebrate CTL sequences. Also, the temporal expressions of CTLs mRNA were detected in R. philippinarum with higher expression level in hepatopancreas and gill, and with lower expression levels in other tissues. The expression pattern of CTL genes in hepatopancreas were investigated under low-temperature stress using real-time quantitative fluorescence PCR (RT-qPCR) and the results showed that the transcription of CTL mRNAs were induced after low-temperature challenge. Overall, the sequence analysis and the expression patterns of CTLs provide clues for understanding the response of the Manila clam to low-temperature stress.
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Affiliation(s)
- Dongdong Li
- Engineering and Technology Research Center of Shellfish Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Hongtao Nie
- Engineering and Technology Research Center of Shellfish Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China.
| | - Kifat Jahan
- Engineering and Technology Research Center of Shellfish Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Xiwu Yan
- Engineering and Technology Research Center of Shellfish Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
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Tang T, Liu J, Li S, Li H, Liu F. Recombinant expression of an oriental river prawn anti-lipopolysaccharide factor gene in Pichia pastoris and its characteristic analysis. FISH & SHELLFISH IMMUNOLOGY 2020; 98:414-419. [PMID: 31962148 DOI: 10.1016/j.fsi.2020.01.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/13/2020] [Accepted: 01/17/2020] [Indexed: 06/10/2023]
Abstract
Anti-lipopolysaccharide factors (ALFs), as main host-defense molecules of crustaceans, form a unique family of antimicrobial peptides (AMPs). MnALF4 is one isoform of ALFs isolated from the freshwater prawn Macrobrachium nipponense. In the present study, MnALF4 gene was successfully expressed in the yeast Pichia pastoris and the recombinant MnALF4 protein exhibited efficient and broad-spectrum antimicrobial activities against both Gram-positive bacteria and Gram-negative bacteria in vitro. When prawns were injected with rMnALF4 before bacterial challenge with E. coli, the recombinant protein effectively promote the elimination of bacteria by the host. It manifested that rMnALF4 could effectively kill the invading bacteria in vivo. Treatment with rMnALF4 led to remarkable changes in bacterial morphology, such as spheroidization, oversized bacteria, and cell lysis. In addition, rMnALF4 showed weak hemolysis activity to the rabbit red blood cells. Our work suggests that MnALF4 plays an important role in Macrobrachium immunity and is worthy of further investigation as a potential antibacterial agent with high efficacy against bacterial infection and low toxicity to host cells.
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Affiliation(s)
- Ting Tang
- The Key Laboratory of Zoological Systematics and Application, College of Life Science, Hebei University, Baoding, Hebei, 071002, China
| | - Jinlan Liu
- Medical College, Hebei University, Baoding, Hebei, 071002, China
| | - Shuangshuang Li
- The Key Laboratory of Zoological Systematics and Application, College of Life Science, Hebei University, Baoding, Hebei, 071002, China
| | - Hongquan Li
- Medical College, Hebei University, Baoding, Hebei, 071002, China
| | - Fengsong Liu
- The Key Laboratory of Zoological Systematics and Application, College of Life Science, Hebei University, Baoding, Hebei, 071002, China.
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Huang Y, Zhang R, Gao T, Xu H, Wu T, Ren Q. 2-Transmembrane C-type lectin from oriental river prawn Macrobrachium nipponense participates in antibacterial immune response. FISH & SHELLFISH IMMUNOLOGY 2019; 91:58-67. [PMID: 31096059 DOI: 10.1016/j.fsi.2019.05.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 05/07/2019] [Accepted: 05/13/2019] [Indexed: 06/09/2023]
Abstract
As a type of pattern-recognition proteins (PRRs), C-type lectins (CTLs) perform important functions in non-self recognition and clearance of pathogens in innate immunity. In this study, a unique 2-transmembrane CTL (designated as Mn-2TM-cLec) with a single carbohydrate recognition domain (CRD) was isolated from Macrobrachium nipponense. The full-length cDNA of Mn-2TM-cLec consisted of 3265 bp with an 837 bp open reading frame encoding a protein with 278 amino acids. Mn-2TM-cLec was ubiquitously distributed in various tissues of normal prawn, particularly in the hemocytes, hepatopancreas, and gills. The expression of Mn-2TM-cLec was significantly up-regulated in the gills and hepatopancreas after the prawns were challenged with Staphylococcus aureus and Vibrio parahaemolyticus. RNA interference knock-down of Mn-2TM-cLec gene decreased the transcription levels of three antimicrobial peptides (anti-lipopolysaccharide factor (ALF) 1, ALF2, and Crustin (Crus) 1) after V. parahaemolyticus infection. The recombinant CRD of Mn-2TM-cLec could bind lipopolysaccharide, peptidoglycans, and diverse bacterial strains and agglutinate S. aureus and V. parahaemolyticus in a Ca2+-dependent manner. In addition, the rCRD enhanced the clearance of V. parahaemolyticus injected in prawns. In summary, Mn-2TM-cLec might act as a PRR to participate in the prawn immune defense against pathogens through its antimicrobial activity.
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Affiliation(s)
- Ying Huang
- College of Oceanography, Hohai University, 1 Xikang Road, Nanjing, Jiangsu, 210098, China; Postdoctoral Innovation Practice Base, Jiangsu Shuixian Industrial Company Limited, 40 Tonghu Road, Baoying, Yangzhou, Jiangsu, 225800, China
| | - Ruidong Zhang
- College of Marine Science and Engineering, Nanjing Normal University, 1 Wenyuan Road, Nanjing, Jiangsu, 210023, China
| | - Tianheng Gao
- College of Oceanography, Hohai University, 1 Xikang Road, Nanjing, Jiangsu, 210098, China
| | - Hui Xu
- Nanjing Hydraulic Research Institute, Nanjing, 210024, China
| | - Ting Wu
- Postdoctoral Innovation Practice Base, Jiangsu Shuixian Industrial Company Limited, 40 Tonghu Road, Baoying, Yangzhou, Jiangsu, 225800, China
| | - Qian Ren
- Co-Innovation Center for Marine Bio-Industry Technology of Jiangsu Province, Lianyungang, Jiangsu, 222005, China; College of Marine Science and Engineering, Nanjing Normal University, 1 Wenyuan Road, Nanjing, Jiangsu, 210023, China.
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Qin Y, Jiang S, Huang J, Zhou F, Yang Q, Jiang S, Yang L. C-type lectin response to bacterial infection and ammonia nitrogen stress in tiger shrimp (Penaeus monodon). FISH & SHELLFISH IMMUNOLOGY 2019; 90:188-198. [PMID: 31028898 DOI: 10.1016/j.fsi.2019.04.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 03/26/2019] [Accepted: 04/11/2019] [Indexed: 06/09/2023]
Abstract
C-type lectins (CTLs) are pattern recognition receptors (PRRs) that are important in invertebrate innate immunity for the recognition and elimination of pathogens. Although they were reported in many shrimp, C-type lectins subfamily contain a large number of members with different functions that need to research in deep. In this present study, a new type of CTL, PmCL1 with 861 bp long full-length cDNA, that encodes a protein with 164-amino acid from a 495-bp open reading frame, was isolated and characterized from tiger shrimp (Penaeus monodon). The mRNA transcript of PmCL1 showed the highest expression in the hepatopancreas, whereas it was barely detected in the ovary. After the shrimp were stimulated by Vibrio harveyi and Vibrio anguillarum, PmCL1 expression in the hepatopancreas and gill was significantly upregulated. A carbohydrate-binding assay revealed the specificity of PmCL1 for pathogen-associated molecular patterns (PAMPs) that included peptidoglycan (PGN) and lipopolysaccharide (LPS), and saccharides that included d-glucose, galactosamine, α-lactose, treholose, and d-mannose. Recombinant PmCL1 agglutinated gram-positive (Staphylococcus aureus) and gram-negative bacteria (V. harveyi, V. anguillarum, Vibrio alginolyticus, Vibrio parahemolyticus, Vibrio vulnificus, and Aeromonas hydrophila) in the presence of calcium ions and enhanced the efficiency of clearing the invading bacteria. Collectively, our results suggested that PmCL1 might play an important role as a pattern recognition receptor (PRR) in the immune response towards pathogen infections, as well as the response towards ammonia nitrogen stress.
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Affiliation(s)
- Yukai Qin
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; College of Aqua-life Science and Technology, Shanghai Ocean University, Shanghai, PR China
| | - Shigui Jiang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; Shenzhen Base of South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shenzhen, 518108, PR China
| | - Jianhua Huang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; Shenzhen Base of South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shenzhen, 518108, PR China
| | - Falin Zhou
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; Shenzhen Base of South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shenzhen, 518108, PR China
| | - Qibin Yang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; Shenzhen Base of South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shenzhen, 518108, PR China
| | - Song Jiang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; Shenzhen Base of South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shenzhen, 518108, PR China
| | - Lishi Yang
- South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Guangzhou, 510300, PR China; Shenzhen Base of South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shenzhen, 518108, PR China.
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Huang X, Han K, Li T, Wang W, Ren Q. Novel L-type lectin from fresh water prawn, Macrobrachium rosenbergii participates in antibacterial and antiviral immune responses. FISH & SHELLFISH IMMUNOLOGY 2018; 77:304-311. [PMID: 29621634 DOI: 10.1016/j.fsi.2018.03.061] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 03/17/2018] [Accepted: 03/31/2018] [Indexed: 06/08/2023]
Abstract
L-type lectins (LTLs) play important roles in the secretory pathway of animals, including selective protein trafficking, sorting, and targeting. They have a leguminous lectin domain and can bind to high-mannose-type oligosaccharides. In this study, a novel LTL, designated as MrVIP36, was identified from Macrobrachium rosenbergii. The full-length cDNA of MrVIP36 was 1687 bp with a 972 bp open reading frame encoding a putative protein of 323 deduced amino acids. The deduced MrVIP36 protein contained an LTL-like domain (LTLD) and a transmembrane domain. Phylogenetic tree analysis indicated that MrVIP36 was a member of invertebrate LTLs. It has a closer evolutionary distance with invertebrate LTLs than vertebrate LTLs. Quantitative real time polymerase chain reaction showed that MrVIP36 is expressed widely in all tested tissues, especially in the hepatopancreas and intestine. MrVIP36 was significantly up-regulated in hemocytes of prawns at different time points after Staphylococcus aureus, Vibrio parahaemolyticus, and White spot syndrome virus (WSSV) infections. The recombinant protein MrLTLD (rMrLTLD) could bind and agglutinate all tested bacteria. Sugar binding assay revealed that rMrLTLD could also bind to the glycoconjugates of the bacterial surface, such as lipopolysaccharide and peptidoglycan. Moreover, rMrLTLD could inhibit the growth activities of microorganisms in vitro and accelerate the bacterial clearance in vivo. rMrLTLD could also inhibit WSSV replication in vivo. Survival rate analysis showed that rMrLTLD could protect prawns against WSSV infection. Taken together, our results suggested that MrVIP36 functioned as a pattern recognition receptor involved in the antibacterial and antiviral immune responses of M. rosenbergii.
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Affiliation(s)
- Xin Huang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Keke Han
- Jiangsu Key Laboratory for Biodiversity and Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Tingting Li
- Jiangsu Key Laboratory for Biodiversity and Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China
| | - Wen Wang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China.
| | - Qian Ren
- Jiangsu Key Laboratory for Biodiversity and Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, Nanjing, 210046, China; Co-Innovation Center for Marine Bio-Industry Technology of Jiangsu Province, Lianyungang, 222005, China.
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Zhang X, Lu J, Mu C, Li R, Song W, Ye Y, Shi C, Liu L, Wang C. Molecular cloning of a C-type lectin from Portunus trituberculatus, which might be involved in the innate immune response. FISH & SHELLFISH IMMUNOLOGY 2018; 76:216-223. [PMID: 29501882 DOI: 10.1016/j.fsi.2018.01.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/25/2018] [Accepted: 01/31/2018] [Indexed: 06/08/2023]
Abstract
C-type lectin plays an important role in the innate immune response of crustaceans including Portunus trituberculatus which is an important marine species. In the present study, we cloned the full length of a C-type lectin (designated as PtCTL4) from P. trituberculatus via 3'RACE. The full length of the nucleic acid sequence has a length of 654 bp including an open reading frame (ORF) of 480 bp. PtCTL4 possesses conserved CTL features, while containing a CRD domain with Ca2+ binding site 2 and six conserved cysteine residues. Quantitative RT-PCR analysis showed that PtCTL4 expression level was highest in the hepatopancreas, while it was relatively low in other tissues such as hemocytes, eyestalk, muscle, and gonad. The expression level of PtCTL4 reached a maximum at 3 h after challenge with Vibrio alginolyticus, then decreased to the lowest level at 12 h, and returned to normal level at 48 h. Hemagglutination analysis showed that the recombinant PtCTL4 (rPtCTL4) can agglutinate rabbit erythrocyte. The rPtCTL4 can agglutinate Gram-positive bacteria (Bacillus aquimaris, Micrococcus lysodeik, and Staphylococcus aureus) and Gram-negative bacteria (Aeromonas hydrophila, V. alginolyticus, and Chryseobacterium indologenes) in the presence of Ca2+. This study indicated that PtCTL4 acts as a pattern recognition receptor in the innate immune response of P. trituberculatus.
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Affiliation(s)
- Xiaona Zhang
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo 315211, China
| | - Junkai Lu
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo 315211, China
| | - Changkao Mu
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China.
| | - Ronghua Li
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China
| | - Weiwei Song
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China
| | - Yangfang Ye
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China
| | - Ce Shi
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China
| | - Lei Liu
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China
| | - Chunlin Wang
- Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China
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