指導教授:王水深臺灣大學:臨床醫學研究所簡禎彥Chien, Chen-YenChen-YenChien2014-11-302018-07-062014-11-302018-07-062014http://ntur.lib.ntu.edu.tw//handle/246246/264389目標:比起全身熱療,漸進式熱前置處理(PTP)因引起較少的血行動力變化、內質網(ER)壓力和氧化刺激而對血管提供較佳之保護。我們認為PTP亦可能可有效地減少因心肌缺血/再灌注所誘導的細胞凋亡和自噬。 方法:將67隻雄性Wistar老鼠隨機分為非PTP控制組,和在一個週期或是連續3個週期進行42℃水浴的PTP 後24及72小時(1-24,1-72,3-24和3-72組)共5組。我們測量在左冠狀動脈前降支結紮3小時與再灌注2小時後體內產生的心肌負氧離子含量。另外由微循環、心電圖和心肌梗塞面積來決定心肌功能和受損程度。PTP因結抗煙酰胺腺嘌呤二核苷酸磷酸氧化酶gp91媒介的氧化刺激,內質網壓力和細胞凋亡及自噬產生的保護作用,則採用Western blot和免疫組化來檢驗。 結果:冠狀動脈缺血/再灌注在控制組及PTP的老鼠上均能抑制心肌的微循環,誘發心電圖ST段部位升高,並增加心肌梗塞之面積。缺血/再灌注會透過加強煙酰胺腺嘌呤二核苷酸磷酸氧化酶gp91的表現、胞漿細胞色素C釋放和降低粒腺體Bcl-2的含量而增加心肌負氧離子。因心肌受傷而被激活的ER壓力-78-kDa的葡萄糖調節蛋白的表現增加了Bax/Bcl-2比值,切割後caspase3的表現和聚(ADP-核糖)聚合酶的片段則導致細胞凋亡的形成﹔並藉由促進LC3-II的表達,進而導致細胞自噬。PTP治療會在老鼠的心臟中升高熱休克蛋白70、熱休克蛋白32和Bcl-2、Bcl-xL與錳超氧化物歧化酶,尤以3-72組量最高。PTP治療能顯著恢復心肌微循環、降低氧化刺激、ER壓力、細胞凋亡、細胞自噬和梗塞面積。 結論:PTP能透過加強抗氧化、抗凋亡和抗細胞自噬機制顯著降低心臟缺血/再灌注之損傷。Objectives: Progressive thermal preconditioning (PTP) provides vascular protection with less hemodynamic fluctuations, endoplasmic reticulum (ER), and oxidative stress compared with whole body hyperthermia. We suggest PTP might efficiently diminish cardiac ischemia/reperfusion-induced apoptosis and autophagy injury. Methods: A total of 67 male Wistar rats were divided into a non-PTP control group, 24 or 72 hours after a single cycle or 3 consecutive cycles of PTP in a 42℃ water bath (1-24, 1-72, 3-24, and 3-72 groups). We measured the cardiac O2¯ amount in vivo in response to left anterior descending coronary artery ligation for 2 hours and reperfusion for 3 hours. Cardiac function and injury were determined by microcirculation, electrocardiography, and infarct size. The PTP-induced protective effects on nicotinamide adenine dinucleotide phosphate oxidase gp91-mediated oxidative stress, ER stress, and apoptosis- and autophagy-related mechanisms were examined using Western blot and immunohistochemistry. Results: Coronary arterial ischemia/reperfusion depressed cardiac microcirculation, induced ST-segment elevation and increased infarct size in non-PTP and PTP rats. Ischemia/reperfusion enhanced the cardiac O2¯ levels by enhanced nicotinamide adenine dinucleotide phosphate oxidase gp91 expression, cytosolic cytochrome C release, and decreased mitochondrial Bcl-2 expression. Cardiac injury activated ER stress–78-kDa glucose-regulated protein expression, increased the Bax/Bcl-2 ratio, cleaved caspase 3 expression and poly-(ADP-ribose)-polymerase fragments, leading to apoptosis formation, and promoted LC3-II expression, resulting in autophagy formation. PTP treatment elevated heat shock protein 70, heat shock protein 32, Bcl-2, Bcl-xL, and manganese superoxide dismutase in the rat heart, especially in the 3-72 group. PTP treatment significantly restored cardiac microcirculation, decreased oxidative stress, ER stress, apoptosis, autophagy, and infarct size. Conclusions: PTP significantly reduced cardiac ischemia/reperfusion injury by upregulating antioxidant, anti-apoptotic, and anti-autophagic mechanisms.口試委員會審定書…………………………………………………… i 誌謝………………………………………………………………… ii 中文摘要…………………………………………………………… iii 英文摘要…………………………………………………………… iv 博士論文內容 第一章 緒論………………………………………………… 1 第一節 背景…………………………………………… 1 第二節 前置處理…………………………………… 3 第三節 前置處理之機轉…………………………… 5 第四節 熱前置處理及熱休克蛋白之角色……… .... 8 第五節 設計最適當之熱前置處理:漸進式熱前置處理. 12 第六節 動機:漸進式熱前置處理對心肌保護的另一可能機轉 15 第七節 欲研究的問題…………………………………………… 17 第二章 研究方法與材料………………………….…………… 18 第三章 結果…………………………………………… …………… 22 第四章 討論..............................................24 第五章 展望………………………………………………… ……… 30 第一節 臨床可能之應用...............................30 第二節 未來的臨床實驗...............................33 論文英文簡述............................................ 41 參考文獻.................................................54 表目錄 表1......................................................64 圖目錄 圖1………………………………………………………………….… 65 圖2……………………………………………………………………. 66 圖3………………………………………………………………….….67 圖4……………………………………………………………………..68 圖5……………………………………………………………………..69 圖6…………………………………………………………………… .70 圖7……………………………………………………………………..71 圖8……………………………………………………………………..72 附錄.....................................................731736937 bytesapplication/pdf論文使用權限:同意有償授權(權利金給回饋學校)漸進式熱前置處理抗氧化抗凋亡抗細胞自噬心臟缺血/再灌注損傷老鼠漸進式熱前置處理與熱休克蛋白在心肌保護作用之角色The Role of Progressive Thermal Preconditioning and Heat Shock Protein in Myocardium Protectionthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/264389/1/ntu-103-D92421101-1.pdf