title: Homocysteine-induced oxidative stress upregulates chymase in mouse mastocytoma cells.
abstract: Reactive oxygen species (ROS) such as hydrogen peroxide (H(2)O(2)), O(*-)(2) and OH(*) participate in the pathogenesis of ischemia/reperfusion injury, inflammation and atherosclerosis. Our previous studies have suggested that increased angiotensin II (Ang II)-forming chymase may be involved in the development of atherosclerosis. However, the regulatory mechanism of chymase expression has not yet been clarified. In this study, we tested whether oxidative stress upregulates mouse mast cell proteinase chymase, mouse mast cell proteinase (MMCP)-5 or MMCP-4. We also examined the expression and activity of these proteins after treatment. Cultured mouse mastocytoma cells (MMC) displaying chymase-dependent Ang II-forming activity were treated with H(2)O(2) and several aminothiols with or without anti-oxidants. The levels of MMCP-5 and MMCP-4 expression were determined by quantitative RT-PCR; the level of chymase-dependent Ang II-forming activity was measured by high performance liquid chromatography using Ang I as a substrate. Treatment of MMC with homocysteine (0.1-3 mmol l(-1)) significantly increased MMCP-5 and MMCP-4 expression, as well as Ang II-forming activity. These effects were significantly inhibited by the addition of catalase and further suppressed by the combination of catalase and superoxide dismutase. Incubation with hydrogen peroxide alone caused a significant increase in Ang II-forming activity, which was completely suppressed by co-treatment with catalase. Furthermore, MMCP-5 and MMCP-4 expression levels were drastically suppressed and chymase induction by homocysteine was diminished under the GATA-inhibited condition. Homocysteine increased mast cell chymase expression and activity through the mechanism of oxidative stress. Our results suggest that there is a biochemical link between oxidative stress and the local Ang II-forming system.
authors: Department of Cardiology, Fukuoka University Faculty of Medicine, Jonan-ku, Fukuoka, Japan.
authors: Kanta
authors: K
authors: Fujimi
authors: Yoshinari
authors: Y
authors: Uehara
authors: Satomi
authors: S
authors: Abe
authors: Akira
authors: A
authors: Kawamura
authors: Sankar
authors: S
authors: Devarajan
authors: Shin-Ichiro
authors: S
authors: Miura
authors: Keijiro
authors: K
authors: Saku
authors: Hidenori
authors: H
authors: Urata
mesh_terms: D000804:Angiotensin II / Q000096:biosynthesis; D000818:Animals; D045744:Cell Line, Tumor; D053818:Chymases / Q000235:genetics*; D006710:Homocysteine / Q000494:pharmacology*; D034801:Mastocytoma / Q000201:enzymology*; D051379:Mice; D018384:Oxidative Stress; D012333:RNA, Messenger / Q000032:analysis; D017382:Reactive Oxygen Species / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D006710:Homocysteine; D000804:Angiotensin II; D053818:Chymases