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Xing J, An Z, Tang X, Sheng X, Chi H, Zhan W. Expression and Immune Characterization of Major Histocompatibility Complex in Paralichthys olivaceus after Antigen Stimulation. BIOLOGY 2023; 12:1464. [PMID: 38132290 PMCID: PMC10741117 DOI: 10.3390/biology12121464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/18/2023] [Accepted: 11/21/2023] [Indexed: 12/23/2023]
Abstract
The Major histocompatibility complex (Mhc) is an important molecule for antigen presenting and binds to T cell receptors, activating T lymphocytes and triggering specific immune responses. To investigate the role of MhcII in adaptive immunity, in this study, mhcIIα and mhcIIβ of flounder (Paralichthys olivaceus) were cloned, polyclonal antibodies (Abs) against their extracellular regions were produced, respectively, and their distribution on cells and tissues and expression patterns, which varied by antigen stimulation or pathogen infection, were investigated. The results showed that the open reading frame (ORF) of mhcIIα is 708 bp, including 235 amino acids (aa); and the ORF of mhcIIβ is 741 bp, encoding 246aa. The mhcIIα and mhcIIβ were significantly expressed in gills, spleen, and peripheral blood leukocytes (PBLs). Their antibodies could specifically recognize eukaryotic expressed MhcIIα and MhcIIβ. MhcIIα+ and MhcIIβ+ cells were 30.2 ± 2.9% of the percentage in peripheral blood leukocytes. MhcII molecules were co-localized with CD83 and IgM on leukocytes, respectively, but not on CD4+ or CD8+ T lymphocyte subpopulations. The expression of both mhcIIα and mhcIIβ were significantly upregulated in flounder after bacteria and virus challenges. The percentages of MhcII+ cells, MhcII+/CD83+, and MhcII+/IgM+ double-positive cells increased significantly after PHA and ConA stimulation, respectively; they varied significantly in PBLs after polyI:C stimulation, and no variations were found after LPS treatment. In the meantime, variations in MhcII+ cells were consistent with that of CD4+ T lymphocytes. These results suggest that MhcII, mainly expressed in B cells and dendritic cells, play an essential role in antigen presentation, and respond significantly to exogenous antigens and T cell-dependent antigens. These results may provide an important reference for the study of cellular immunity in teleosts.
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Affiliation(s)
- Jing Xing
- Laboratory of Pathology and Immunology of Aquatic Animals, Key Laboratory of Mariculture, Ministry of Education (KLMME), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.X.); (Z.A.); (X.T.); (X.S.); (H.C.)
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Zhaoxia An
- Laboratory of Pathology and Immunology of Aquatic Animals, Key Laboratory of Mariculture, Ministry of Education (KLMME), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.X.); (Z.A.); (X.T.); (X.S.); (H.C.)
| | - Xiaoqian Tang
- Laboratory of Pathology and Immunology of Aquatic Animals, Key Laboratory of Mariculture, Ministry of Education (KLMME), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.X.); (Z.A.); (X.T.); (X.S.); (H.C.)
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Xiuzhen Sheng
- Laboratory of Pathology and Immunology of Aquatic Animals, Key Laboratory of Mariculture, Ministry of Education (KLMME), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.X.); (Z.A.); (X.T.); (X.S.); (H.C.)
| | - Heng Chi
- Laboratory of Pathology and Immunology of Aquatic Animals, Key Laboratory of Mariculture, Ministry of Education (KLMME), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.X.); (Z.A.); (X.T.); (X.S.); (H.C.)
| | - Wenbin Zhan
- Laboratory of Pathology and Immunology of Aquatic Animals, Key Laboratory of Mariculture, Ministry of Education (KLMME), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.X.); (Z.A.); (X.T.); (X.S.); (H.C.)
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
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Li C, Jiang J, Zhang Q, Wang X. Duplicated major histocompatibility complex class II genes in the tongue sole (Cynoglossus semilaevis
). Int J Immunogenet 2018; 45:210-224. [DOI: 10.1111/iji.12368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Revised: 02/25/2018] [Accepted: 03/22/2018] [Indexed: 12/26/2022]
Affiliation(s)
- C. Li
- Ministry of Education Key Laboratory of Marine Genetics and Breeding; College of Marine Life Sciences; Ocean University of China; Qingdao China
| | - J. Jiang
- Ministry of Education Key Laboratory of Marine Genetics and Breeding; College of Marine Life Sciences; Ocean University of China; Qingdao China
| | - Q. Zhang
- Ministry of Education Key Laboratory of Marine Genetics and Breeding; College of Marine Life Sciences; Ocean University of China; Qingdao China
| | - X. Wang
- Ministry of Education Key Laboratory of Marine Genetics and Breeding; College of Marine Life Sciences; Ocean University of China; Qingdao China
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Functional Analysis of the Promoter Region of Japanese Flounder ( Paralichthys olivaceus) β-actin Gene: A Useful Tool for Gene Research in Marine Fish. Int J Mol Sci 2018; 19:ijms19051401. [PMID: 29738459 PMCID: PMC5983668 DOI: 10.3390/ijms19051401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 04/21/2018] [Accepted: 05/02/2018] [Indexed: 12/16/2022] Open
Abstract
A newly isolated Japanese flounder (Paralichthys olivaceus) β-actin promoter and its derivative compact construct Poβ-actinΔ−1080/−801Δ−500/−201 have recently been demonstrated to promote ectopic gene expression in cell lines. Different Poβ-actin promoter deletion mutants were constructed and functionally characterized. Mutational analyses by dual-luciferase detected that three regulatory elements, including one enhancer (−1399/−1081) and two silencers (−1080/−801, −500/−201) in the first intron. The sequence located at −1399/−1081 was determined to significantly affect promoter activity. Additionally, the first exon (−1489/−1400) could also remarkably promote the β-actin promoter activity. In the following transduction application, we removed the two silencers and generated a compact reconstruct promoter/enhancer (Poβ-actinΔ−1080/−801Δ−500/−201), which exhibited relatively stronger promoter activity compared with Poβ-actin. Furthermore, the green fluorescent protein (GFP) transgenic stable flounder cell line was obtained by the reconstructed Poβ-actinΔ−1080/−801Δ−500/−201 promoter. Our study provided the potential application of Japanese flounder β-actin, particularly Poβ-actinΔ−1080/−801Δ−500/−201, in ectopic gene expression in the future.
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Hofmann MJ, Bracamonte SE, Eizaguirre C, Barluenga M. Molecular characterization of MHC class IIB genes of sympatric Neotropical cichlids. BMC Genet 2017; 18:15. [PMID: 28201988 PMCID: PMC5310070 DOI: 10.1186/s12863-017-0474-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 01/13/2017] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The Major Histocompatibility Complex (MHC) is a key component of the adaptive immune system of all vertebrates and consists of the most polymorphic genes known to date. Due to this complexity, however, MHC remains to be characterized in many species including any Neotropical cichlid fish. Neotropical crater lake cichlids are ideal models to study evolutionary processes as they display one of the most convincing examples of sympatric and repeated parallel radiation events within and among isolated crater lakes. RESULTS Here, we characterized the genes of MHC class IIB chain of the Midas cichlid species complex (Amphilophus cf. citrinellus) including fish from five lakes in Nicaragua. We designed 19 new specific primers anchored in a stepwise fashion in order to detect all alleles present. We obtained 866 genomic DNA (gDNA) sequences from thirteen individuals and 756 additional sequences from complementary DNA (cDNA) of seven of those individuals. We identified 69 distinct alleles with up to 25 alleles per individual. We also found considerable intron length variation and mismatches of alleles detected in cDNA and gDNA suggesting that some loci have undergone pseudogenization. Lastly, we created a model of protein structure homology for each allele and identified their key structural components. CONCLUSIONS Overall, the Midas cichlid has one of the most diverse repertoires of MHC class IIB genes known, which could serve as a powerful tool to elucidate the process of divergent radiations, colonization and speciation in sympatry.
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Affiliation(s)
- Melinda J Hofmann
- Museo Nacional de Ciencias Naturales, CSIC, José Gutiérrez Abascal, 2, 28006, Madrid, Spain
| | - Seraina E Bracamonte
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker weg 20, 24105, Kiel, Germany
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany
| | - Christophe Eizaguirre
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker weg 20, 24105, Kiel, Germany
- Queen Mary University of London, School of Biological and Chemical Sciences, Mile End Road, London, E1 4NS, UK
| | - Marta Barluenga
- Museo Nacional de Ciencias Naturales, CSIC, José Gutiérrez Abascal, 2, 28006, Madrid, Spain.
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