Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8498175 | Fish & Shellfish Immunology | 2018 | 32 Pages |
Abstract
Hemocytes are the first line of defence of the innate immune system of molluscs. For the first time hemocytes of Crassostrea hongkongensis were morphologically and functionally characterized, identifying circulating cell types and studying their involvement in immune responses. In the present study, two main populations, hyalinocytes and granulocytes, were characterized based on the presence or absence of cytoplasmic granules, using light and electron microscopy (TEM), and flow cytometry analyses. Granulocytes are 7-13â¯Î¼m in diameter and present evident cytoplasmic granules, and hyalinocytes, 6-15â¯Î¼m in diameter, with a few or no granules. The mean number of circulating hemocytes in the hemolymph was 2.52â¯Ãâ¯106â¯cells/mL. Flow cytometry indicated that both granulocytes and hyalinocytes showed cell phagocytosis and reactive oxygen species (ROS) production. However, phagocytosis and spontaneous production of reactive oxygen species (ROS) in granulocytes are much more active compared with hyalinocytes, which demonstrated that the granulocytes are the main hemocytes involved in the immune response of Hong Kong oyster. Moreover, the cell-free hemolymph showed antibacterial activity against Vibrio alginolyticus. Our results provide the basic information of hemocytes population of Hong Kong oyster for further investigations associated with innate immunity.
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Authors
Jun Li, Yuehuan Zhang, Fan Mao, Yue Lin, Shu Xiao, Zhiming Xiang, Haitao Ma, Yang Zhang, Ziniu Yu,