Seawater acidification induced immune function changes of haemocytes in Mytilus edulis: a comparative study of CO2and HCl enrichment.
The present study was performed to evaluate the effects of CO2- or HCl-induced seawater acidification (pH 7.7 or 7.1; control: pH 8.1) on haemocytes of Mytilus edulis, and the changes in the structure and immune function were investigated during a 21-day experiment. The results demonstrated that seawater acidification had little effect on the cellular mortality and granulocyte proportion but damaged the granulocyte ultrastructure. Phagocytosis of haemocytes was also significantly inhibited in a clearly concentration-dependent manner, demonstrating that the immune function was affected. Moreover, ROS production was significantly induced in both CO2and HCl treatments, and four antioxidant components, GSH, GST, GR and GPx, had active responses to the acidification stress. Comparatively, CO2had more severe destructive effects on haemocytes than HCl at the same pH level, indicating that CO2stressed cells in other ways beyond the increasing H+concentration. One possible explanation was that seawater acidification induced ROS overproduction, which damaged the ultrastructure of haemocytes and decreased phagocytosis.
Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
Tianli
T
Sun
Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
Xuexi
X
Tang
Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
Yongshun
Y
Jiang
Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
You
Y
Wang
D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D002245:Carbon Dioxide / Q000494:pharmacology*; D005978:Glutathione / Q000378:metabolism; D006434:Hemocytes / Q000187:drug effects / Q000276:immunology* / Q000648:ultrastructure; D006851:Hydrochloric Acid / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D049880:Mytilus edulis / Q000166:cytology* / Q000187:drug effects / Q000276:immunology* / Q000648:ultrastructure; D010587:Phagocytosis / Q000187:drug effects; D017382:Reactive Oxygen Species / Q000378:metabolism; D012623:Seawater / Q000737:chemistry*
D000975:Antioxidants; D017382:Reactive Oxygen Species; D002245:Carbon Dioxide; D005978:Glutathione; D006851:Hydrochloric Acid