title: Simultaneous quantitative analysis of prostaglandins and thromboxane after low-dose X irradiation.
abstract: The appearance of prostaglandins and thromboxane in mouse serum after X irradiation was observed by simultaneous quantitative analysis using gas chromatography/mass spectrometry/selected ion monitoring with stable isotope dilution methods. Mice of two strains (C57BL/CN Jcl and BALB/c) showed similar responses to X irradiation. In C57BL/6N Jcl mice, 0.2 Gy irradiation elicited a significant increase in generation of prostanoids: Immediately after irradiation, the 6-keto PGF1 alpha:TXB2 ratio and the level of PGE2 increased, after 20 min 6-keto PGF1 alpha and PGE2 increased, and after 4 h PGE1 and PGE2 increased. In BALB/c mice, generation of prostanoids was increased significantly immediately after irradiation (6-keto PGF1 alpha, 6-keto PGF1 alpha:TXB2 ratio, PGE2), and the increase was maintained from 20 min to 4 h (PGE1, PGE2) after 0.2 Gy irradiation. In C57BL/6N Jcl mice, a significant increase in production of 9alpha,11beta-PGF2 was observed at 20 min after irradiation. In BALB/c mice, a significant increase in 9alpha,11beta-PGF2 was seen immediately after irradiation and was maintained for 20 min. In C57BL/6N Jcl mice, the level of 8-epi PGF2 alpha was clearly increased 4 h after 4 Gy irradiation. A slight and slow increase was also seen after 0.2 Gy irradiation. In BALB/c mice, 8-epi PGF2 alpha was increased significantly at 20 min and 4 h after 4 Gy irradiation. These results show that 0.2 Gy irradiation stimulates production of prostanoids related to the inflammatory response in mice.
authors.affiliation: Bio-Science Department Komae Branch, Central Research Institute of Electric Power Industry, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamaoka
authors.forename: T
authors.initials: T
authors.lastname: Obata
authors.forename: K
authors.initials: K
authors.lastname: Iriyama
authors.forename: T
authors.initials: T
authors.lastname: Iwasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Hoshi
mesh_terms: D000818:Animals; D004307:Dose-Response Relationship, Radiation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D011453:Prostaglandins / Q000097:blood*; D013931:Thromboxanes / Q000097:blood*; D014965:X-Rays
chemical_list: D011453:Prostaglandins; D013931:Thromboxanes