The antibacterial activity of erythrocytes from Clarias fuscus associated with phagocytosis and respiratory burst generation

文献类型： 外文期刊

第一作者： Xu, Zizheng

作者： Xu, Zizheng;Yang, Youcheng;Babu, V. Sarath;Chen, Jiajun;Li, Feng;Yang, Minxuan;Li, Ningqiu;Li, Jun;Lin, Li;Qin, Zhendong;Li, Ningqiu;Li, Jun

作者机构：

关键词： Clarias fuscus; Antibacterial activity; RBCs; ROS; Antioxidant enzymes; Phagocytosis

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）

ISSN： 1050-4648

年卷期： 2021 年 119 卷

页码：

收录情况： SCI

摘要： It is widely known that red blood cells (RBCs) are responsible for respiration and the transport of gas. However, recent reports have also described the immune properties of RBCs, therefore creating new understanding for the functionality of RBCs. However, little is known about the immunological role of RBCs in bony fish. In this study, we used RBCs from Clarias fuscus as a model and demonstrate that these cells exhibited phagocytic ability with both latex beads and bacteria. Scanning electron microscopy and transmission electron microscopy provided visual confirmation of the phagocytotic process in RBCs. In addition, we used flow cytometry and fluorescence microscopy to analyse the rate of phagocytosis in RBCs. We found that RBCs exhibited stable phagocytotic ability with latex beads ranging from 0.5 to 1.0 mu m in size. In response to bacterial stimulation, RBCs produced reactive oxygen species (ROS) and nitric oxide synthase (NOS), which are harmful to bacteria. RBCs also have an antioxidant system. Under conditions of oxidative stress, the expression levels of antioxidant enzymes, and particularly those of superoxide dismutase(SOD) increased significantly. Our results show that the erythrocytes of bony fish are phagocytic and also produce ROS which are toxic to bacteria. In addition, RBCs have an antioxidant system that removes excess ROS production to protect cells from oxidative damage.

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