Abstract
The knowledge concerning the humoral immunity is scarce in amphioxus Branchiostoma belcheri. This study measured the humoral parameters including phenoloxidase (PO) activity, lysozyme activity, antimicrobial activity, microbial agglutinin, and hemagglutinin in amphioxus humoral fluids before and after lipopolysaccharide (LPS) challenge. Humoral fluids from unchallenged Branchiostoma belcheri (B. belcheri) had PO activity, lysozyme, antimicrobial, microbial agglutinating, and hemagglutinating activities, which may represent part of the baseline level of innate immunity in this organism. After challenge with LPS, many humoral parameters were all increased significantly including the PO activity, lysozyme activity, growth-inhibiting activities against Gram-negative bacteria Escherichia coli (E. coli) and Vibrio alginolyticus (V. alginolyticus), growth-inhibiting activities against Gram-positive bacteria Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis), microbial agglutinating activities against Micrococcus lysodeikticus (M. lysodeikticus), B. subtilis, and S. aureus, and hemagglutinating activities against rabbit and human A and O erythrocytes. In contrast, the agglutinating activities against V. harveyi and E. coli and the hemagglutinating activity against human B erythrocytes in the humoral fluids were reduced in response to LPS challenge. It appears that the humoral fluids of B. belcheri contain components that are able to differentiate different microbes and different human blood cell types.
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Acknowledgments
We thank Prof. Shicui Zhang for his help and advice in this study. This work was supported by the National Natural Science Foundation of China (Grant No. 31172074; Grant No. 30700071), the Shandong Provincial Natural Science Foundation (Grant No. ZR2010CL002), Young Teacher Support Program in Shandong University of Technology, and the National High Technology and Development Program (Grant No. 2008AA09Z411).
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Pang, Q., Liu, X., Zhao, B. et al. Induction of phenoloxidase and other immunological activities in the humoral fluids of amphioxus Branchiostoma belcheri challenged with Lipopolysaccharide (LPS). Fish Physiol Biochem 38, 1835–1842 (2012). https://doi.org/10.1007/s10695-012-9680-7
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DOI: https://doi.org/10.1007/s10695-012-9680-7