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Molecular cloning and expression analyses of immunoglobulin tau heavy chain (IgT) in turbot, Scophthalmus maximus.

Authors
  • Tang, Xiaoqian1
  • Du, Yang2
  • Sheng, Xiuzhen2
  • Xing, Jing1
  • Zhan, Wenbin3
  • 1 Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China. , (China)
  • 2 Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China. , (China)
  • 3 Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Veterinary immunology and immunopathology
Publication Date
Sep 01, 2018
Volume
203
Pages
1–12
Identifiers
DOI: 10.1016/j.vetimm.2018.07.011
PMID: 30243367
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Immunoglobulins (Igs) are humoral mediators playing the prevailing role in the innate and adaptive immunities of jawed vertebrates and provide obligatory duties to protect the organism from a wide variety of pathogens. In the present study, the membrane-bound and secretory immunoglobulin T (mIgT and sIgT) genes of turbot (Scophthalmus maximus) were cloned for the first time with the intention of better understanding the IgT functions. The mIgT cDNA is 2, 049 bp in length including a leader region, a variable region, four constant regions and a transmembrane region (TM), while the 1, 932 bp sIgT cDNA lacks the transmembrane region. In healthy turbot, the total IgT was highly expressed in gill, spleen and liver followed by peripheral blood leucocytes (PBL), skin and hindgut, and then in stomach, head kidney, trunk kidney, midgut and foregut. The expression levels of sIgT in PBL, gill, skin and spleen were much higher than mIgT. Furthermore, the expression profiles of turbot mIgT and sIgT were investigated post vaccination with formalin-inactivated Vibrio anguillarum via intraperitoneal injection and immersion, and the results showed that the expressions of mIgT and sIgT were both significantly induced by two administration routes, whereas intraperitoneal injection mostly induced mIgT expression in systematic organs including head kidney, spleen and trunk kidney, and the immersion vaccination elicited a much stronger response of sIgT in mucosa-associated tissues including gills, liver, hindgut and skin. Taken together, these results demonstrated that mIgT and sIgT were differentially expressed in different tissues and both responded positively to the vaccinations in turbot, and indicated that IgT-secreting plasma cells are abundant in mucosa-associated tissues and played important roles in mucosal immunity of turbot. Copyright © 2018 Elsevier B.V. All rights reserved.

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