Document Detail

Photochemical formation of hydroxyl radicals in tissue extracts of the coral Galaxea fascicularis.
MedLine Citation:
PMID:  21155074     Owner:  NLM     Status:  In-Process    
Various stresses induce the formation of reactive oxygen species (ROS) in biological cells. In addition to stress-induced ROS, we studied the photochemical formation of hydroxyl radicals (˙OH), the most potent ROS, in coral tissues using phosphate buffer-extracted solutions and a simulated sunlight irradiation system. ˙OH formation was seen in extracts of both coral host and endosymbiont zooxanthellae. This study is the first to report quantitative measurements of ˙OH photoformation in coral tissue extracts. Our results indicated that whether or not coral bleaching occurred, coral tissues and symbiotic zooxanthellae have the potential to photochemically produce ˙OH under sunlight. However, no significant difference was found in the protein content-normalized formation rates of ˙OH between corals incubated under different temperatures and irradiance conditions. ˙OH formation rates were reduced by 40% by reducing the UV radiation in the illumination. It was indicated that UV radiation strongly affected ˙OH formation in coral tissue and zooxanthellae, in addition to its formation through photoinhibition processes.
Tomihiko Higuchi; Hiroyuki Fujimura; Yuya Hitomi; Takemitsu Arakaki; Tamotsu Oomori; Yoshimi Suzuki
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Photochemistry and photobiology     Volume:  86     ISSN:  1751-1097     ISO Abbreviation:  Photochem. Photobiol.     Publication Date:    2010 Nov-Dec
Date Detail:
Created Date:  2010-12-08     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376425     Medline TA:  Photochem Photobiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1421-6     Citation Subset:  IM    
Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Nishihara-cho, Okinawa, Japan.
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