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  5. 臺灣鉤藤活性成分及 statin 新穎衍生物之神經細胞保護活性研究
 
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臺灣鉤藤活性成分及 statin 新穎衍生物之神經細胞保護活性研究

Other Title
Neurocytoprotective effects on the constituents of Uncaria hirsuta Haviland and novel statin derivatives
Type
thesis
Date Issued
2013-07-09
Author(s)
林怡慈
Advisor
李美賢
Subjects
系所名稱:生藥學研究所
Description
學位別:碩士
語文別:中文
指導教授:李美賢
共同指導教授:
口試委員:沈郁強;徐鳳麟
中文關鍵字:帕金森氏症;神經保護;臺灣鉤藤;PC12 細胞;statin
Abstract
帕金森氏症 (Parkinson’s disease) 為常見的神經退化性疾病之一,乃由於黑質體多巴胺神經元受損所造成,主要發生在老年人身上。本研究中,本論文以六-羥基多巴胺 (6-hydroxydopamine) 處理 PC12 細胞株作為體外試驗模式,探討中藥材-臺灣鉤藤 (Uncaria hirsuta Haviland) (茜草科) 及 statin 新穎衍生物之神經保護作用。臺灣鉤藤為中藥材鉤藤的來源之一,本論文以其帶鉤莖枝及葉部,分別利用 95% 酒精及水加熱迴流萃取,再以乙酸乙酯、正丁醇及水進行部份劃分。利用薄層色層分析法 (TLC) 及高效能液相層析法 (HPLC) 進行化學指紋圖譜分析。以具有較佳的神經細胞保護活性之正丁醇層萃取物,利用高效液相層析儀-固相萃取-核磁共振儀串連分析技術 (LC-SPE-NMR) 及各種管柱層析進行化學成分之分離純化,得到三個化合物,經理化及光譜相關數據與參考文獻比對後,確認結構為 5β-carboxystrictosidine (1)、chlorogenic acid (2)、uncarine A (3),其中 5β-carboxystrictosidine (1) 及 chlorogenic acid (2) 具有顯著的神經細胞保護活性。本論文並以紅麴菌的二次代謝產物 lovastatin 進行結構修飾,合成一系列的 statin 類新穎衍生物 (S1~S12),探討其神經保護活性及作用機制,結果顯示 S10 於 100 μM 濃度下,具有顯著的神經保護活性且具有劑量依存性,EC50 為 63.6 μM。S10 可抑制六-羥基多巴胺誘導的 PC12 細胞凋亡,具抑制細胞內 caspase-3 及 caspase-8 活性,但對細胞內 ROS含量無影響。期望透過本研究在臺灣鉤藤及statin 衍生物之研究,提供未來於發展治療或預防帕金森氏症藥物之參考。
URI
https://203.71.86.71/handle/123456789/13791

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