期刊
FISH & SHELLFISH IMMUNOLOGY
卷 118, 期 -, 页码 102-110出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2021.08.031
关键词
IgT; Protein characterization; Basal expression; Epinephelus coioides
资金
- National Natural Science Foundation of China [41876162, 41976081, 42006100]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110424]
- China Postdoctoral Science Foundation [2019M662938]
- Guangdong Provincial Special Fund For Modern Agriculture Industry Technology Innovation Teams [2019KJ141]
Grouper IgT is found to be polymeric in serum and mucus, with high expression levels in the head kidney and spleen of normal groupers. The number of IgT-positive cells in different tissues correlates with their expression levels. IgT is also capable of coating bacteria in the mucus.
Immunoglobulins (Igs) play a vital role in the adaptive immunity of gnathostomes. IgT, a particular Ig class in teleost fishes, receives much attention concerning the mucosal immunity. While, the characteristic and function of Epinephelus coioides IgT is still unknown. In our study, a polyclonal antibody was first prepared with grouper IgT heavy chain recombinant protein. IgT was revealed to be polymeric in serum and mucus. In normal groupers, IgT had high expression level in head kidney and spleen, while little amount in gills, thymus, gut and liver. The number of IgT-positive cells in different tissues was in line with their IgT expression. Furthermore, IgT could coat fractional bacteria in the mucus. In conclusion, this research revealed the protein characteristic, basal expression and bacterial coverage of grouper IgT. This is the first study to identify the characteristic of grouper IgT and demonstrate the capacity of coating microbes.
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