• 系統編號 RN9408-0309
• 計畫中文名稱 三亞麻油酸對應力所誘發血管內皮細胞內皮素基因表現的作用
• 計畫英文名稱 Effect of Trilinolein on Cyclic Strain-Induced Endothelin-1 Gene Expression in Vascular Endothelial Cells
• 主管機關 行政院國家科學委員會 • 計畫編號 NSC92-2314-B038-056
• 執行機構 臺北醫學大學醫學系
• 本期期間 9208 ~ 9307
• 報告頁數 11 頁 • 使用語言 英文
• 研究人員 陳保羅 Chan, Paul
• 中文關鍵字 三亞麻油二烯酸甘油脂; 血管內皮細胞; 內皮素; 基因表現
• 英文關鍵字 Trilinolein; Vascular endothelial cell; Endothelin; Gene expression
• 中文摘要
三亞麻油酸( Trilinolein, Tril)為一天然三酸甘油脂,主要是分離自傳統中草藥三七(又名田七或川七)的根部。過去的實
驗顯示具有心肌保護作用。但它的細胞分子作用機轉仍未清楚。本實驗使用血管內皮細胞,在應力拉扯下會產生氧自由基(
ROS)再加上內皮素第一型( Endothelin-1, ET-1)的作用, ET-1 也會刺激 ROS 的產生及心肌細胞肥厚。經由此實驗模 式,來觀察 Tril 的作用。實驗結果顯示 Tril 可減少 ROS 的產生。利用對照組的抗氧化物 N-acetyl-cysteine( NAC)也有同樣 效果。兩種物質 Tril 及 NAC 都可減少因 ROS 或 ET-1 刺激而激活的 Activator protein-1( AP-1)reporter gene 的活化,已知 AP-1 是導致心肌細胞肥厚的訊息傳遞因子之一。故 Tril 的分子保護機轉可能經由抑制 AP-1 的作
• 英文摘要
Ttrilinolein, isolated from the traditional Chinese herb Sanchi (Panax notoginseng), has been shown to have myocardial protective effects via its antioxidant ability. However, the cellular and molecular mechanisms of the protective effect of trilinolein in the
vascular system remain to be elucidated. Endothelin-1 (ET-1) is a potent vasopressor synthesized by endothelial cells both in culture and in vivo. The aims of this study were to test the hypothesis that trilinolein may alter strain-induced ET-1 secretion and to identify the putative underlying signaling pathways in endothelial cells. We show that trilinolein inhibits strain-induced ET-1 secretion.
Trilinolein also inhibits strain-increased reactive oxygen species (ROS) formation. Furthermore, pretreating cells with trilinolein or antioxidant N-acetyl-cysteine decrease strain-increased ET-1 secretion. Both trilinolein and N-acetyl-cysteine also attenuated the strain-stimulated activator protein-1 reporter activity. In summary, we demonstrate that trilinolein inhibits strain-induced ET-1 secretion, partially via attenuation of ROS formation.