Abstract
B cell activating factor (BAFF), belonging to the tumor necrosis factor superfamily (TNFSF), is a critical cytokine for B cell survival and immunoglobulin secretion. Here, the BAFF gene of Chinese sucker (Myxocyprinus asiaticus) (MaBAFF) was cloned using RT-PCR and RACE (rapid amplification of cDNA end) techniques. The open reading frame (ORF) of MaBAFF encodes a 272-amino acid protein containing a transmembrane domain, a TNF family signature, and a putative furin protease cleavage site as seen in BAFFs from other species. Tissue expression profiles of MaBAFF determined by absolute and relative quantification of real-time quantitative PCR (qPCR) showed that MaBAFF is widely distributed in various tissues, with the highest expression in spleen. MaBAFF can be detected during fertilized egg period by RT-PCR. Upon induction by A. hydrophila, the expression of MaBAFF was up-regulated in spleen from 48 to 72 h, and the expression of BAFF and IgM all reached a peak at 48 h in head kidney. The soluble BAFF gene (MasBAFF) had been cloned into pET30a. SDS-PAGE and Western blotting analysis confirmed that the His-MasBAFF was efficiently expressed in Escherichia coli Rosset (DE3). CCK-8 assay indicated that the MasBAFF recombinant protein (200 ng/ml) could prolong the survival of peripheral blood leukocytes. Based on ELISA screening and Western blotting, monoclonal antibody 1-F2A3 against recombinant MasBAFF was selected and used for immunohistochemistry, which showed that BAFF-positive cells were detected in spleen and head kidney. Our results raise the possibility that MaBAFF may be useful to enhance immune efficacy in Chinese sucker disease defense.
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Acknowledgments
We are grateful for the technique support provided by Professor Deshou Wang at South west University.
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This work was supported by grant CX2018097 from the Innovation Projects of Chongqing Overseas Students’ Innovation Support Plan, grant cstc2020jcyj-msxmX1045 from the Chongqing Natural Science Foundation of China, and grant 31972776 from the National Natural Science Foundation of China.
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JZ, YL, and XW conducted experiments and analyzed the data; RZ contributed to animal preparation; JZ and YL prepared the original manuscript draft; JW and ZW reviewed and edited the manuscript; XZ designed the whole experiment and reviewed the manuscript.
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Zhang, J., Li, Y., Wu, X. et al. Molecular structure, expression, and function analysis of BAFF gene in Chinese sucker, Myxocyprinus asiaticus. Fish Physiol Biochem 47, 225–238 (2021). https://doi.org/10.1007/s10695-020-00906-5
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DOI: https://doi.org/10.1007/s10695-020-00906-5