Futoshi Kuribayashi
   Department     ,
Article types 原著
Language English
Peer review Peer reviewed
Title Zymosan induces production of superoxide anions by hemocytes of the solitary ascidian Halocynthia roretzi.
Journal Formal name:Comparative biochemistry and physiology. Toxicology & pharmacology
Abbreviation:Comp. Biochem. Physiol. C Toxic. Pharm.
Volume, Issue, Page 133(4),567-574頁
Author and coauthor Azumi Kaoru, Kuribayashi Futoshi, Kanegasaki Shiro, Yokosawa Hideyoshi.
Publication date 2002/12
Summary Reactive oxygen intermediates (ROIs), including superoxide anions and hydrogen peroxide, are generated by phagocytes in invertebrates, as well as in vertebrates. To understand the molecular mechanisms underlying the generation of ROIs by hemocytes of the solitary ascidian Halocynthia roretzi, we established a method of measuring ROIs using luminol-dependent chemiluminescence (LDCL). LDCL analyses revealed that both zymosan and phorbol myristate acetate (PMA), but not lipopolysaccharide, beta1,3-glucan, or formylpeptide, induced the generation of ROIs by H. roretzi hemocytes. The zymosan-induced LDCL was markedly inhibited by the addition of superoxide dismutase (SOD) or H. roretzi plasma. A calcium-chelating reagent, BAPTA-AM, completely inhibited the zymosan-induced LDCL. On the other hand, the PMA-induced LDCL was only slightly inhibited by the addition of SOD or BAPTA-AM. Spectroscopic analysis at a low temperature revealed that H. roretzi hemocytes had absorption spectra specific for type b cytochrome, a component of the NADPH oxidase complex in mammalian phagocytes. These results strongly suggest that H. roretzi hemocytes generate superoxide anions upon phagocytosis and that intracellular calcium ions and possibly an NADPH oxidase complex are involved in their generation by H. roretzi hemocytes.