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Epinephelus immunity

Shaoqing Zang, Xin Zhang, Chen Li, Liqun Wang, Jingguang Wei, Qiwei Qin
Phosphorylation of eukaryotic initiation factor 2 alpha subunit (eIF2α) occurs under a variety of conditions, including viral infection. Heme-regulated inhibitor (HRI) is an eIF2α kinase that modifies this phosphorylation. In this study, a HRI homologue (EcHRI) from the orange-spotted grouper (Epinephelus coioides) was cloned and its roles during fish viral infection were characterized. EcHRI encodes a 664-amino acid polypeptide that shares a high degree of similarity with HRIs from other species. Quantitative real-time polymerase chain reaction analysis indicated that EcHRI was distributed in all examined tissues...
February 9, 2019: Fish & Shellfish Immunology
Yujia Sun, Zhixia Zhuang, Xiaoru Wang, Huabin Huang, Qi Fu, Qingpi Yan
Pseudomonas plecoglossicida is an important and highly pathogenic bacterium for aquaculture and causes serious losses. The expression level of flgM was found to be significantly upregulated post-infection compared with in vitro results, which was confirmed by quantitative real-time PCR. RNAi significantly reduced the expression level of flgM mRNA of P. plecoglossicida. Compared with infection with the wild-type strain, infection with the flgM-RNAi strain resulted in a delay in death and a 75% reduction in the mortality of Epinephelus coioides, followed by alleviation of the symptoms in E...
January 29, 2019: Fish & Shellfish Immunology
Zhenzhu Sun, Xiaohong Tan, Minglei Xu, Qingying Liu, Huaqun Ye, Cuiyun Zou, Chaoxia Ye
Cold stress has caused great economic loss in fish culture worldwide. Orange-spotted grouper (Epinephelus coioides) is one of the most serious lost aquatic animals in 2016 cold fronts in South China. However, the molecular mechanism of grouper's cold resistance has remained largely unknown. In the present study, HiSeq™2000 (Illumina) was used to analyze the transcriptomic profiles of the liver from grouper under control temperature (CT, 28 °C) and low temperature (LT, 13 °C). Two normalized liver cDNA libraries of CT and LT groups were created...
December 27, 2018: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
Jingguang Wei, Chen Li, Xin Zhang, Lanfen Fan, Shina Wei, Qiwei Qin
Protein SUMOylation (SUMO is small ubiquitin-related modifier) is a dynamic process that is strictly regulated under physiological and pathological conditions. We previously cloned and characterized two SUMO homologue genes (EcSUMO1 and EcSUMO2) from orange-spotted grouper (Epinephelus coioides). In the present study, the SUMO3 homologue from E. coioides (EcSUMO3) was cloned and its possible roles in fish immunity were analyzed. The open reading frame of EcSUMO3 contains 285 base pairs encoding a 94 amino acid protein with a predicted molecular mass of 10...
December 26, 2018: Fish & Shellfish Immunology
Yu-Ling Su, Guo Chen, Liang-Shi Chen, Jia-Zhou Li, Gang Wang, Jia-Yang He, Tian-Yong Zhan, Yan-Wei Li, Mu-Ting Yan, You-Hua Huang, Qi-Wei Qin, Xue-Ming Dan, Hong-Yan Sun
Antimicrobial peptides (AMPs) are small proteins showing broad-spectrum antimicrobial activity that have been known to be powerful agents against a variety of pathogens (bacteria, fungi and viruses). In this study, the effects of AMPs from Bacillus subtilis on Epinephelus coioides were examined. E. coioides were fed with diets containing AMPs (0, 100, 200, 400 or 800 mg/kg) for four weeks. Results showed that the levels of total protein (TP), albumin (ALB), alanine aminotransferase (ALT), aspartate aminotransferase (AST), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C) and blood glucose (GLU) and lipopolysaccharide (LPS) in the serum of E...
December 26, 2018: Fish & Shellfish Immunology
Xiazi Huang, Bochao Hu, Xiaodong Yang, Licai Gong, Jingyun Tan, Li Deng
Piscidins are important components in protecting microbial infections in teleost. The present study purified and identified a truncated peptide, whose sequence was very close to that of putative mature peptide of epinecidin-1 (piscidin-1) in orange-spotted grouper (Epinephelus coioides), Epi-1 (also named as short form of ecPis-1, ecPis-1S). The immunomodulatory effects of ecPis-1S on splenic lymphocytes of orange-spotted grouper were explored in vitro. The transcriptome study was carried out by De novo transcriptome sequencing (RNA-Seq) in splenic lymphocytes of orange-spotted grouper...
December 25, 2018: Fish & Shellfish Immunology
Yanyan Chen, Shuanghu Cai, Jichang Jian
Vibrio alginolyticus is well-known as an opportunistic Gram-negative pathogen, which endangers the development of global aquaculture as well as human health. In this study, a ΔacfA mutant strain and complementation of the ΔacfA mutant (C-acfA) were constructed. The ΔacfA mutant was tested in pearl gentian grouper (♀Epinephelus fuscoguttatus × ♂Epinephelus lanceolatu) to observe the changes in virulence and evaluate its potential as an attenuated live vaccine. The results showed that the ΔacfA mutant caused a high antibody titer and a significant reduction in the ability to colonize the intestine of pearl gentian grouper...
December 17, 2018: Fish & Shellfish Immunology
Sheng Zhou, Deli Song, Xiaofeng Zhou, Xinliang Mao, Xuefeng Zhou, Sunli Wang, Jingguang Wei, Youhua Huang, Wenxiong Wang, Su-Mei Xiao, Qiwei Qin
Probiotics are widely used for the improvement of animals' growth and health. However, few marine aquatic probiotics are applied and licensed in China. In this study, a Bacillus spp. strain was isolated from the Hulong grouper gastrointestinal tract, which was identified as a new strain of Bacillus subtilis and was named as 7k. B. subtilis 7k showed desirable capability of sporulation and resistance to heat, simulated gastric juice and simulated duodenum juice, indicating its potential as probiotics. Seven antimicrobial chemicals were found in the secretion of the B...
October 26, 2018: Fish & Shellfish Immunology
Zhiming Zhu, Chuanfu Dong, Shaoping Weng, Jianguo He
Vibrio harveyi is a serious pathogen of scale drop and muscle necrosis disease in marine commercial fishes. Adhesion to and colonization of the host cells surfaces is the first and crucial step for pathogenic bacterial infection, which is usually mediated by outer membrane proteins (Omps). The objectives of this study were to identify the major adhesin in Omps that plays the essential role in adhesion of V. harveyi to the host cells, and to assess the potential of this adhesin as a vaccine candidate for V. harveyi infection...
November 16, 2018: Fish & Shellfish Immunology
Ze-Quan Mo, Rui Han, Jiu-Le Wang, Lu-Yun Ni, Yu-Ling Su, Xue-Li Lai, Zhi-Chang He, Hong-Ping Chen, Yan-Wei Li, Hong-Yan Sun, Xiao-Chun Luo, Xue-Ming Dan
MEK dual-specificity protein kinases are a group of mitogen-activated protein kinase kinases, which act as an integration point by transferring extracellular signals to the nucleus. To investigate the function of MEK in teleost fish, we cloned MEK1 and MEK2 cDNA sequences from the orange-spotted grouper (Epinephelus coioides). EcMEK1 and EcMEK2 shared 80% amino acid identity with each other. EcMEK1 had 89-99% amino acid identity with teleosts or mammals, whereas EcMEK2 shared 85-97% amino acid identity. The exon structures of the grouper MEK1/2 genes were conserved with zebrafish and human MEK1/2...
November 9, 2018: Fish & Shellfish Immunology
Shina Wei, Shaowen Wang, Min Yang, Youhua Huang, Jingguang Wei, Xiaohong Huang, Qiwei Qin
The lysosomal cysteine protease cathepsin C plays a pivotal role in regulation of inflammatory and immune responses. However, the function of fish cathepsin C in virus replication remains largely unknown. In this study, cathepsin C gene (Ec-CC) was cloned and characterized from orange-spotted grouper, Epinephelus coioides. The full-length Ec-CC cDNA was composed of 2077 bp. It contained an open reading frame (ORF) of 1374 bp and encoded a 458-amino acid protein which shared 89% identity to cathepsin C from bicolor damselfish (Stegastes partitus)...
October 9, 2018: Fish & Shellfish Immunology
Qi Zheng, Huasong Ji, Shina Wei, Jufen Tang, Yishan Lu, Jia Cai, Jichang Jian, Qiwei Qin
Bcl-2 family proteins play essential roles in modulating immune response and controlling cells' fate. Bcl-xL is one of anti-apoptotic protein in this family. In this study, a new Bcl-xL homolog (EcBcl-xL) was identified and characterized from orange-spotted grouper, Epinephelus coioides. EcBcl-xL encoded a 221 amino acid peptides that shared 86% identity to Larimichthys crocea Bcl-xL protein, contained four conserved BH domains and one transmembrane region. The predicted three-dimensional structure of EcBcl-xL was similar with Homo sapiens Bcl-xL...
December 2018: Fish & Shellfish Immunology
Min Yang, Qing Wang, Shaowen Wang, Yuxing Wang, Qinglu Zeng, Qiwei Qin
In this study, the transcriptional response of grouper to Singapore grouper iridovirus (SGIV) stimulation was characterized using RNA sequencing. Transcriptome sequencing of three test groups in the grouper was performed using the Illumina MiSeq platform. The three test groups were a control group, which was injected with PBS buffer; a high-susceptible (HS) group, which died shortly after the SGIV injection; and a high-resistance (HR) group, which survived the SGIV injection. In total, 38,253 unigenes were generated...
January 2019: Developmental and Comparative Immunology
Qing Wang, Shaowen Wang, Yong Zhang, Yepin Yu, Huihong Zhao, Huirong Yang, Leyun Zheng, Min Yang, Qiwei Qin
Chemokines comprise a group of small molecular weight (6-14 kDa) cytokines; chemokine receptors are a superfamily of seven transmembrane domain G-coupled receptors. Both chemokines and their receptors have important roles in immune surveillance, inflammation, and development. Recently, 9 CXC chemokine ligands (CXCLs) and 8 CXC chemokine receptors (CXCRs) were identified and cloned from orange-spotted grouper (Epinephelus coioides) and annotated by phylogenetic and syntenic analyses. We detected mRNA transcripts for CXCLs and CXCRs in healthy tissues of E...
January 2019: Developmental and Comparative Immunology
Cuiyun Zou, Xiaohong Tan, Huaqun Ye, Zhenzhu Sun, Shu Chen, Qingying Liu, Minglei Xu, Chaoxia Ye, Anli Wang
The present study is aiming at evaluating the hepatoprotective of Radix Bupleuri extracts (RBE) on the d-galactosamine/lipopolysaccharide (D-GalN/LPS) induced liver injury of hybrid grouper in vitro and in vivo. In vitro, RBE (0, 200, 400 and 800 μg/ml) was added to the hybrid grouper primary hepatocytes before (pretreatment) the incubation of the hepatocytes with D-GalN (20 mM) plus LPS (1 μg/ml) in the culture medium. RBE at concentrations of 200, 400 and 800 μg/ml significantly improved cell viability and inhibited the elevation of TNF-α, IL-1β and IL-6 and significantly down-regulated the caspase-3, caspase-9 and P53 mRNA levels...
August 23, 2018: Fish & Shellfish Immunology
Yujia Sun, Gang Luo, Lingmin Zhao, Lixing Huang, Yingxue Qin, Yongquan Su, Qingpi Yan
Pseudomonas plecoglossicida is an important pathogen for aquaculture and causes high mortality in various marine fishes. Expression of sigX was found significantly up-regulated at 18°C than at 28°C, which was verified by quantitative real-time PCR (qRT-PCR). RNAi significantly reduced the content of sigX mRNA of P. plecoglossicida , whether in in vitro or in the spleen at all sampling time points. Compared with the wild-type strain, the infection of sigX -RNAi strain resulted in the onset time delay, and 20% reduction in mortality of Epinephelus coioides , as well as alleviates in the symptoms of E...
2018: Frontiers in Immunology
Ze-Quan Mo, Jiu-Le Wang, Rui Han, Qing Han, Yan-Wei Li, Hong-Yan Sun, Xiao-Chun Luo, Xue-Ming Dan
B-cell linker protein (BLNK) is an adaptor protein that plays a crucial role in the B cell antigen receptor (BCR) signal pathway. To investigate the function of BLNK in teleost fish, we cloned a BLNK ortholog gene from the orange-spotted grouper (Epinephelus coioides). Homology analysis showed that the grouper BLNK (EcBLNK) had a 34%-77% amino acid identity in comparison to other vertebrates and shared the highest amino acid identity with BLNK from the Asian seabass Lates calcarifer. EcBLNK comprises an N-terminal SAM domain and a C-terminal B-cell linker SH2 domain...
October 2018: Fish & Shellfish Immunology
Jingguang Wei, Chen Li, Xin Zhang, Sheng Zhou, Shaoqing Zang, Shina Wei, Qiwei Qin
Small ubiquitin-related modifiers (SUMOs) are post-translationally conjugated to other proteins and are essential regulators of a wide range of cellular processes. Covalent attachment of SUMO requires an enzymatic cascade consisting of a single E1-activating enzyme (Aos1 and Uba2 heterodimer), a single E2-conjugating enzyme (Ubc9), and one of several E3 ligases that facilitate transfer of SUMO from Ubc9 to the substrate. In the present study, the Aos1 and Uba2 homologues (EcAos1 and EcUba2) from the orange-spotted grouper (Epinephelus coioides) were cloned and their possible roles in fish immunity were analyzed...
October 2018: Fish & Shellfish Immunology
Bin Yin, Hongyu Liu, Beiping Tan, Xiaohui Dong, Shuyan Chi, Qihui Yang, Shuang Zhang, Liqiao Chen
Cottonseed protein concentrate (CPC) has similar amino acid composition compared with fish meal, and has the characteristics of low gossypol and low toxicity. The present study was conducted to investigate the growth performance, antioxidant capacity and different intestinal segments immune responses of hybrid grouper to replacement dietary fish meal ofCPC. Six iso-nitrogenous (50% crude protein) and iso-lipidic (10% crude lipid) diets were formulated: a reference diet (FM) containing 60% fishmeal and five experimental diets (12%, 24%, 36%, 48 and 60%) in which fishmeal protein was substituted at different levels by CPC to feed fish (initial body weight: 11 ± 0...
October 2018: Fish & Shellfish Immunology
Wanwan Zhang, Zelin Li, Peng Jia, Wei Liu, Meisheng Yi, Kuntong Jia
Interferon (IFN) regulatory factor 3 (IRF3) is a major regulator contributing to the host away from viral infection. Here, an IRF3 gene from sea perch (LjIRF3) was identified and its role in regulating early apoptosis signaling and IFN response was investigated during red spotted grouper nervous necrosis virus (RGNNV) infection. The cDNA of LjIRF3 encoded a putative 465 amino acids protein, containing a DNA binding domain, an IRF association domain and a serine-rich domain. Phylogenetic analysis suggested that LjIRF3 shared the closest genetic relationship with Epinephelus coioides IRF3...
November 2018: Developmental and Comparative Immunology
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