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Holzinger JM, Toelge M, Werner M, Ederer KU, Siegmund HI, Peterhoff D, Blaas SH, Gisch N, Brochhausen C, Gessner A, Bülow S. Scorpionfish BPI is highly active against multiple drug-resistant Pseudomonas aeruginosa isolates from people with cystic fibrosis. eLife 2023; 12:e86369. [PMID: 37461324 PMCID: PMC10353861 DOI: 10.7554/elife.86369] [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: 01/21/2023] [Accepted: 06/07/2023] [Indexed: 07/20/2023] Open
Abstract
Chronic pulmonary infection is a hallmark of cystic fibrosis (CF) and requires continuous antibiotic treatment. In this context, Pseudomonas aeruginosa (Pa) is of special concern since colonizing strains frequently acquire multiple drug resistance (MDR). Bactericidal/permeability-increasing protein (BPI) is a neutrophil-derived, endogenous protein with high bactericidal potency against Gram-negative bacteria. However, a significant range of people with CF (PwCF) produce anti-neutrophil cytoplasmic antibodies against BPI (BPI-ANCA), thereby neutralizing its bactericidal function. In accordance with literature, we describe that 51.0% of a total of 39 PwCF expressed BPI-ANCA. Importantly, an orthologous protein to human BPI (huBPI) derived from the scorpionfish Sebastes schlegelii (scoBPI) completely escaped recognition by these autoantibodies. Moreover, scoBPI exhibited high anti-inflammatory potency towards Pa LPS and was bactericidal against MDR Pa derived from PwCF at nanomolar concentrations. In conclusion, our results highlight the potential of highly active orthologous proteins of huBPI in treatment of MDR Pa infections, especially in the presence of BPI-ANCA.
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Affiliation(s)
- Jonas Maurice Holzinger
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
| | - Martina Toelge
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
| | - Maren Werner
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
| | - Katharina Ursula Ederer
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
| | | | - David Peterhoff
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
- Institute of Medical Microbiology and Hygiene Regensburg, University of Regensburg, Regensburg, Germany
| | | | - Nicolas Gisch
- Division of Bioanalytical Chemistry, Priority Area Infections, Research Center Borstel, Leibniz Lung Center, Borstel, Germany
| | - Christoph Brochhausen
- Institute of Pathology, University of Regensburg, Regensburg, Germany
- Institute of Pathology, University Medical Center Mannheim, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - André Gessner
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
- Institute of Medical Microbiology and Hygiene Regensburg, University of Regensburg, Regensburg, Germany
| | - Sigrid Bülow
- Institute of Clinical Microbiology and Hygiene Regensburg, University Hospital Regensburg, Regensburg, Germany
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2
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Bian ZC, Cai XH, Tan KA, Wang YD, Huang Z, Kwan KY, Xu P. Identification and Functional Analysis of ToBPI1/LBP and ToBPI2/LBP in Anti-Bacterial Infection of Trachinotus ovatus. Genes (Basel) 2023; 14:genes14040826. [PMID: 37107584 PMCID: PMC10138239 DOI: 10.3390/genes14040826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/25/2023] [Accepted: 03/28/2023] [Indexed: 04/29/2023] Open
Abstract
Bactericidal/permeability-increasing protein (BPI) and lipopolysaccharide-binding protein (LBP) are a group of antibacterial proteins that play an important role in the host's innate immune defense against pathogen infection. In this study, two BPI/LBPs, named ToBPI1/LBP (1434 bp in length, 478 amino acids) and ToBPI2/LBP (1422 bp in length, 474 amino acids), were identified from the golden pompano. ToBPI1/LBP and ToBPI2/LBP were significantly expressed in immune-related tissues after being challenged with Streptococcus agalactiae and Vibrio alginolyticus. The two BPI/LBPs showed significant antibacterial activity against Gram-negative Escherichia coli and Gram-positive S. agalactiae and Streptococcus iniae. In contrast, the antibacterial activity against Staphylococcus aureus, Corynebacterium glutamicum, Vibrio parahaemolyticus, V. alginolyticus and Vibrio harveyi was low and decreased with time. The membrane permeability of bacteria treated with recombinant ToBPI1/LBP and ToBPI2/LBP was significantly enhanced. These results suggest that ToBPI1/LBP and ToBPI2/LBP may play important immunological roles in the immune response of the golden pompano to bacteria. This study will provide basic information and new insights into the immune response mechanism of the golden pompano to bacteria and the function of BPI/LBP.
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Affiliation(s)
- Ze-Chang Bian
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Animal Science and Technology, Guangxi University, Nanning 530004, China
| | - Xiao-Hui Cai
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
| | - Kian Ann Tan
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
| | - Ya-Dan Wang
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
| | - Zhuang Huang
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
| | - Kit Yue Kwan
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
| | - Peng Xu
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China
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3
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Wu Y, Du H, Zhu L, Zhao N, Zhang S, Cao Z, Zhou Y, Sun Y. Bactericidal permeability-increasing protein/LPS-binding protein (BPI/LBP) enhances resistance of golden pompano Trachinotus ovatus against bacterial infection. FISH & SHELLFISH IMMUNOLOGY 2022; 131:872-880. [PMID: 36347416 DOI: 10.1016/j.fsi.2022.10.065] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 10/28/2022] [Accepted: 10/30/2022] [Indexed: 06/16/2023]
Abstract
Antimicrobial peptides are crucial components of innate immunity against microbial invasions. As a kind of antimicrobial peptides, bactericidal permeability-increasing protein (BPI)/lipopolysaccharide-binding protein (LBP) play vital roles in defending the host against gram-negative bacteria. In the current study, a novel BPI/LBP from Trachinotus ovatus (TroBPI/LBP) was characterized. The full length of TroBPI/LBP cDNA sequence is 1434 bp, which contained 477 amino acids. Multiple amino acid alignments of TroBPI/LBP shows 34.07%-84.49% identity with other fish BPI/LBP. Similar to other BPI/LBP, TroBPI/LBP also possesses an N-terminal signal peptide, a BPI/LBP/CETP N-terminal domain, and a BPI/LBP/CETP C-terminal domain. In vitro, the recombinant protein of TroBPI/LBP showed effective bacterial depression activity and binding activity to gram-negative bacteria. In vivo, TroBPI/LBP was constitutively expressed in tested tissues, and the highest expression level was in liver. Following Vibrio alginolyticus stimulation, the mRNA expression of TroBPI/LBP was significantly upregulated in immune-related tissues, and peaked at 12 h post-infection, which confirmed that TroBPI/LBP was highly sensitive to V. alginolyticus stimuli. Furthermore, functional analyses showed that the overexpression of TroBPI/LBP could enhance the ability of fish to against V. alginolyticus infection, and the knockdown of TroBPI/LBP significantly diminished bacterial clearance capacity post-infection. Therefore, these results suggest that TroBPI/LBP may play an important role in host defense against bacterial infection.
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Affiliation(s)
- Ying Wu
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China; Collaborative Innovation Center of Marine Science and Technology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, PR China
| | - Hehe Du
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China
| | - Lin Zhu
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China; Collaborative Innovation Center of Marine Science and Technology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, PR China
| | - Na Zhao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China
| | - Shengnan Zhang
- Collaborative Innovation Center of Marine Science and Technology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, PR China
| | - Zhenjie Cao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China; Collaborative Innovation Center of Marine Science and Technology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, PR China
| | - Yongcan Zhou
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China; Collaborative Innovation Center of Marine Science and Technology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, PR China.
| | - Yun Sun
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, PR China; Collaborative Innovation Center of Marine Science and Technology, College of Marine Science, Hainan University, Haikou, Hainan, 570228, PR China.
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4
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Jiang C, Wang S. Identification and functional characterization of bactericidal permeability/increasing protein (BPI) from frog Nanorana yunnanensis (Paa yunnanensis). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2022; 137:104517. [PMID: 36028172 DOI: 10.1016/j.dci.2022.104517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 08/13/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
Bactericidal permeability/increasing protein (BPI) and lipopolysaccharide-binding protein (LBP) have been most extensively studied in mammals, but little information is available regarding BPI and LBP in Amphibia. In this study we showed that the cDNA of BPI in the frog N. yunnanensis (P. yunnanensis) encoded a 490-amino-acid-long protein, the predicted tertiary structure appears closely similar to mammalian BPIs in terms of sequence and structure. Like mammalian BPI gene, the frog gene nybpi was widely expressed in various tissues and was inducible by challenge with LPS or Gram-negative bacterium. We also showed that recombinant NyBPI, resembling mammalian BPIs, specifically binds with LPS. In addition, the recombinant NyBPI displayed antibacterial activity against Gram-negative bacteria Vibrio anguillarum in a dose-dependent manner. These results indicate that NyBPI may play an important role in an immune response against bacteria in amphibians.
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Affiliation(s)
- Chengyan Jiang
- College of Biological and Agricultural Sciences, Honghe University, Mengzi, Yunnan, 661199, China.
| | - Shaolong Wang
- College of Biological and Agricultural Sciences, Honghe University, Mengzi, Yunnan, 661199, China
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5
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Sellaththurai S, Ganeshalingam S, Jung S, Choi JY, Kim DJ, Lee J. Insight into the molecular structure and function of peptidoglycan recognition protein SC2 (PGRP-SC2) from Amphiprion clarkii: Investigating the role in innate immunity. FISH & SHELLFISH IMMUNOLOGY 2022; 131:559-569. [PMID: 36241004 DOI: 10.1016/j.fsi.2022.10.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/28/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
Peptidoglycan recognition proteins (PGRPs) belong to the pattern recognition receptor (PRR) family and are conserved from insects to mammals. PGRPs show specific binding abilities to peptidoglycans (PGNs) in various microbes. In this study, molecular and functional analyses of PGRP-SC2 from Amphiprion clarkii (AcPGRP-SC2) were conducted. The 492 bp ORF of AcPGRP-SC2 encoded a protein of 164 amino acids with a molecular weight of 17.58 kDa and pI of 8.9. The PGRP superfamily domain was identified from the protein sequence of AcPGRP-SC2 and sequence similarities were observed with homologous proteins. Quantitative polymerase chain reaction (qPCR) analysis revealed that AcPGRP-SC2 transcripts were ubiquitously expressed in all tested tissues, with high levels in the skin, and transcript expression was significantly modulated by immune stimulation with lipopolysaccharide (LPS), Polyinosinic:polycytidylic acid (poly I:C), and Vibrio harveyi post-immune challenge. Recombinant AcPGRP-SC2 with the maltose-binding protein fusion (rAcPGRP-SC2) was used to evaluate LPS-, PGN-, and bacterial-binding activities and to conduct bacterial agglutination assays, and the results demonstrated that AcPGRP-SC2 exhibited bacterial recognition, binding, and colonization abilities to a range of Gram-positive and Gram-negative bacterial strains. Moreover, rAcPGRP-SC2-pre-treated Fat Head Minnow (FHM) cells exhibited significant upregulation in NF-ĸB1, NF-ĸB2, and stat3 expression upon treatment with killed bacteria. Taken together, our findings suggest that AcPGRP-SC2 plays an important role in the immune response against microbial pathogens in A. clarkii.
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Affiliation(s)
- Sarithaa Sellaththurai
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63333, Republic of Korea
| | - Subothini Ganeshalingam
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63333, Republic of Korea
| | - Sumi Jung
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63333, Republic of Korea
| | - Ji Yong Choi
- Jeju Fisheries Research Institute, National Institute Fisheries Science, Jeju, 63068, South Korea
| | - Dae-Jung Kim
- Jeju Fisheries Research Institute, National Institute Fisheries Science, Jeju, 63068, South Korea
| | - Jehee Lee
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63333, Republic of Korea.
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6
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Liu Y, Zha H, Han X, Yu S, Chai Y, Zhong J, Zhu Q. Molecular characterization and functional analysis of the bactericidal permeability-increasing protein/LPS-binding protein (BPI/LBP) from roughskin sculpin (Trachidermus fasciatus). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 123:104133. [PMID: 34000320 DOI: 10.1016/j.dci.2021.104133] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/08/2021] [Accepted: 05/10/2021] [Indexed: 06/12/2023]
Abstract
Bactericidal permeability-increasing protein (BPI) and lipopolysaccharide (LPS) binding proteins (LBP) both play important roles in innate immunity against bacterial infection. Herein, we identified a novel full-length cDNA sequence of BPI/LBP from Trachidermus fasciatus (designated as TfBPI/LBP). The full-length cDNA sequence of TfBPI/LBP was 1594bp, which contains an open reading frame (ORF) of 1422bp encoding a secreted protein with 473 amino acid residues. Similar to BPI/LBPs from other teleost and mammals, the peptide of TfBPI/LBP contains an N-terminal BPI/LBP/CETP domain with an LPS-binding motif and a C-terminal BPI/LBP/CETP domain BPI2. Multiple alignments and phylogenetic analysis supported that TfBPI/LBP was a new member of the vertebrate BPI/LBP family. TfBPI/LBP gene was ubiquitously expressed in all detected tissues, with the most abundant in the liver, and could be significantly induced in the skin, blood, liver, spleen post LPS challenge. The recombinant N-terminal domain of TfBPI/LBP (designated as rTfBPI/LBPN) was successfully expressed in Escherichia coli. Sugar binding assay showed that rTfBPI/LBPN could bind to LPS, peptidoglycan (PGN), and lipoteichoic acid (LTA), with the highest affinity to LPS. The results of bacteria binding and agglutinating assay revealed that rTfBPI/LBPN could bind and agglutinate to all of the 9 kinds of bacteria we used. Moreover, membrane integrity analysis indicated that rTfBPI/LBPN could increase the membrane permeability of bacteria. These results suggested that BPI/LBP may play crucial roles in host defense against microorganisms, possibly through non-selective bacterial recognition and induction of membrane penetration.
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Affiliation(s)
- Yingying Liu
- Ocean College, Shandong University (Weihai), Weihai, 264209, China
| | - Haidong Zha
- Ocean College, Shandong University (Weihai), Weihai, 264209, China
| | - Xiaodi Han
- Ocean College, Shandong University (Weihai), Weihai, 264209, China
| | - Shanshan Yu
- Ocean College, Shandong University (Weihai), Weihai, 264209, China
| | - Yingmei Chai
- Ocean College, Shandong University (Weihai), Weihai, 264209, China
| | - Jinmiao Zhong
- Ocean College, Shandong University (Weihai), Weihai, 264209, China
| | - Qian Zhu
- Ocean College, Shandong University (Weihai), Weihai, 264209, China.
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7
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Gu QQ, He SW, Liu LH, Wang GH, Hao DF, Liu HM, Wang CB, Li C, Zhang M, Li NQ. A teleost bactericidal permeability-increasing protein-derived peptide that possesses a broad antibacterial spectrum and inhibits bacterial infection as well as human colon cancer cells growth. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 118:103995. [PMID: 33412232 DOI: 10.1016/j.dci.2021.103995] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 12/31/2020] [Accepted: 01/01/2021] [Indexed: 06/12/2023]
Abstract
The bactericidal permeability-increasing protein (BPI) is a multifunctional cationic protein produced by neutrophils with antibacterial, antitumor, and LPS-neutralizing properties. In teleost, a number of BPIs have been reported, but their functions are very limited. In this study, an N-terminal peptide, BO18 (with 18 amino acids), derived from rock bream (Oplegnathus fasciatus) BPI, was synthesized and investigated for its antibacterial spectrum, action mechanism, immunoregulatory property as well as the inhibition effects on bacterial invasion and human colon cancer cells growth. The results showed that BO18 was active against Gram-positive bacteria Bscillus subiilis, Micrococcus luteus, and Staphylococcus aureus, as well as Gram-negative bacteria Vibrio alginolyticus, Vibrio litoralis, Vibrio parahaemolyticus and Vibrio vulnificus. BO18 treatment facilitated the bactericidal process of erythromycin and rifampicin by enhancing the permeability of the outer membrane. During its interaction with V. alginolyticus, BO18 exerted its antibacterial activity by destroying cell membrane integrity, penetrating into the cytoplasm and binding to genomic DNA and total RNA. In vitro analysis indicated BO18 could enhance the respiratory burst ability and regulate the expression of immune related genes of macrophages. In vivo detection showed the administration of fish with BO18 before bacterial infection significantly reduced pathogen dissemination and replication in tissues. In addition, BO18 exerted a cytotoxic effect on the growth of human colon cancer cells HT-29. Together, these results add new insights into the function of teleost BPIs, and support that BO18 is a novel and broad-spectrum antibacterial peptide with potential to apply in fighting pathogenic infection in aquaculture.
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Affiliation(s)
- Qin-Qin Gu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Shu-Wen He
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Li-Hui Liu
- Key Laboratory of Fishery Drug Development, Ministry of Agriculture and Rural Affairs, Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, Guangdong Province, 510380, PR China
| | - Guang-Hua Wang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Dong-Fang Hao
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Hong-Mei Liu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Chang-Biao Wang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Chao Li
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Min Zhang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China; Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, Shandong Province, China.
| | - Ning-Qiu Li
- Key Laboratory of Fishery Drug Development, Ministry of Agriculture and Rural Affairs, Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, Guangdong Province, 510380, PR China.
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8
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Sellaththurai S, Omeka WKM, Nadarajapillai K, Shanaka KASN, Jung S, Lee S, Lee J. Identification, molecular characterization, expression analysis and wound-healing ability of multifunctional calreticulin from big-belly seahorse Hippocampus abdominalis. FISH & SHELLFISH IMMUNOLOGY 2020; 106:410-420. [PMID: 32805417 DOI: 10.1016/j.fsi.2020.08.014] [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: 04/28/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 06/11/2023]
Abstract
Calreticulin (CRT) is a multifunctional ubiquitous protein that is widely presented in all cells in eukaryotes except erythrocytes. CRT is well known for diverse cellular functions such as endoplasmic reticulum (ER)-specialized protein quality control during protein synthesis and folding, in-vivo Ca2+ homeostasis, antigen presentation, phagocytosis, wound-healing, proliferation, adhesion, and migration of cells. In the current study, we identified CRT from Hippocampus abdominalis (HaCRT) and analyzed expression profiles and functional properties. The cDNA sequence of HaCRT was identified with an open reading frame of 1226 bp. The molecular weight of HaCRT was estimated as 49 kDa. The in-silico study revealed conserved sequence arrangements such as two CRT signature motifs (5'-KHEQSIDCGGGYVKVF-3' and 5'-LMFGPDICG-3'), triplicate repeats (5'-IKDPEAKKPEDWD-3', 5'-IPDPDDTKPEDWD-3', 5'-IPDPDAKKPDDWD-3'), signal peptide and an ER-targeting 5'-KDEL-3' sequence of HaCRT. Close sequence similarity of HaCRT was observed with Hippocampus comes from phylogenetic analysis and pairwise sequence comparison. From quantitative polymerase chain reaction (qPCR) results, HaCRT was ubiquitously distributed in all tested tissues and expression levels of HaCRT were significantly modulated in blood, liver and gill tissues after stimulation with Streptococcus iniae, Edwardsiella tarda, polyinosinic:polycytidylic acid, and lipopolysaccharides. Bacterial- and pathogen-associated molecular patterns-binding activities were observed with recombinant HaCRT (rHaCRT). The treatment of murine macrophages with rHaCRT induced the expression of immune genes, such as tumor necrosis factor-α (TNF-α), interleukin 6 (IL-6), inducible nitric oxide synthase (iNOS), and interleukin-1β (IL-1β). Furthermore, rHaCRT exhibited wound-healing ability. Based on the results from the above study, we suggest that HaCRT play an indispensable role in the immunity of big-belly seahorses by recognition and elimination of pathogens as well as the tissue repairing process.
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Affiliation(s)
- Sarithaa Sellaththurai
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
| | - W K M Omeka
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
| | - Kishanthini Nadarajapillai
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
| | - K A S N Shanaka
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
| | - Sumi Jung
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
| | - Sukkyoung Lee
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea
| | - Jehee Lee
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju Self-Governing Province, 63243, Republic of Korea.
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9
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Zhou S, Jiang G, Zhu Y, Liu L, Liu D, Diao J, Liu H, Xiu Y. Molecular identification and function analysis of bactericidal permeability-increasing protein/LPS-binding protein 1 (BPI/LBP1) from turbot (Scophthalmus maximus). FISH & SHELLFISH IMMUNOLOGY 2019; 87:499-506. [PMID: 30731212 DOI: 10.1016/j.fsi.2019.02.004] [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: 12/01/2018] [Revised: 01/14/2019] [Accepted: 02/02/2019] [Indexed: 06/09/2023]
Abstract
Bactericidal permeability-increasing protein (BPI) and lipopolysaccharide-binding protein (LBP) play important roles in host antimicrobial defense. In the present study, we identified one isoform of BPI/LBP gene from turbot (Scophthalmus maximus), designated as SmBPI/LBP1. The full-length cDNA sequence of SmBPI/LBP1 was 1826 bp, which encoding one secreted protein with 480 amino acid residues. Structurally, the SmBPI/LBP1 showed high similarity to its homologs from other vertebrates or invertebrates, which all contained a signal peptide, a BPI/LBP/CETP N-terminal with a LPS-binding domain, and a BPI/LBP/CETP C-terminal domain. The deduced amino acid sequences of SmBPI/LBP1 shared significant similarity to BPI/LBP of Seriola lalandi dorsalis (71%) and Paralichthys olivaceus (69%). Phylogentic analysis further supported that SmBPI/LBP1 act as a new member of vertebrate BPI/LBP family. SmBPI/LBP1 was ubiquitously expressed in all tested tissues, with the highest expression level in spleen tissue. The mRNA expression of SmBPI/LBP1 in spleen and kidney were significantly up-regulated after Vibrio vulnificus challenge. Finally, the recombinant SmBPI/LBP1 showed high affinity to lipopolysaccharide, followed by peptidoglycan and lipoteichoic acid, which is the ubiquitous component of Gram-negative or Gram-positive bacteria. These results indicated that SmBPI/LBP1 probably played important roles in immune response against bacteria infection.
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Affiliation(s)
- Shun Zhou
- Marine Science and Engineering College, Qingdao Agricultural University, Qingdao, 266109, China
| | - Guangpeng Jiang
- Marine Science and Engineering College, Qingdao Agricultural University, Qingdao, 266109, China
| | - Ying Zhu
- Key Lab of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, PR China
| | - Lanhao Liu
- Marine Science and Engineering College, Qingdao Agricultural University, Qingdao, 266109, China
| | - Danyang Liu
- Marine Science and Engineering College, Qingdao Agricultural University, Qingdao, 266109, China
| | - Jing Diao
- Shandong Key Laboratory of Disease Control in Mariculture, Marine Biology Institute of Shandong Province, 266104, Qingdao, PR China
| | - Hongjun Liu
- Shandong Key Laboratory of Disease Control in Mariculture, Marine Biology Institute of Shandong Province, 266104, Qingdao, PR China
| | - Yunji Xiu
- Marine Science and Engineering College, Qingdao Agricultural University, Qingdao, 266109, China; Shandong Key Laboratory of Disease Control in Mariculture, Marine Biology Institute of Shandong Province, 266104, Qingdao, PR China.
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Dietary fatty acid source has little effect on the development of the immune system in the pyloric caeca of Atlantic salmon fry. Sci Rep 2019; 9:27. [PMID: 30631091 PMCID: PMC6328623 DOI: 10.1038/s41598-018-37266-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 11/29/2018] [Indexed: 12/26/2022] Open
Abstract
The quality and relative amounts of dietary lipids may affect the health and growth of cultured Atlantic salmon. So far, little is known about their effects on the performance of the fish immune system during early life stages and, in particular their importance in the transition from endogenous nutrition (yolk) in the alevin stage to exogenous nutrition in the later fry stage. We investigated the immunomodulatory effects of fish oil, vegetable oil and phospholipid-rich oil in feeds for farmed Atlantic salmon using a transcriptomic approach. The experiment allowed a fine-scale monitoring of gene expression profiles in two tissues, the pyloric caeca of the intestine and the liver, in a 94 days-long first feeding experiment. The analysis of transcriptional profiles revealed that first feeding induced a strong immunomodulation in the pyloric caeca after 48 days of feeding, lasting up to day 94 and possibly beyond. On the other hand, the differential effect of the three dietary regimes was negligible. We interpret this upregulation, undetectable in liver, as a potentiation of the immune system upon the first contact of the digestive system with exogenous feed. This process involved a complex network of gene products involved in both cellular and humoral immunity. We identified the classical pathway of the complement system, acting at the crossroads between innate and adaptive immunity, as a key process modulated in response to the switch from endogenous to exogenous nutrition.
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