• 沒有找到結果。

本研究藉由篩選具有解熱、鎮痛、抗發炎作用之中草藥對於 LPS

與Interferon-γ 誘導小鼠巨噬細胞(RAW264.7)產生 NO 抑制之作用為 指標,設立一實驗篩選平台。

首先從八十七種用於治療抗發炎、解熱及鎮痛之中草藥篩選對 LPS 與 Interferon-γ 誘導巨噬細胞(RAW264.7)產生 NO 抑制之影響。

其中半枝蓮不僅活性佳,且為台灣民間常用的抗癌藥物,又半枝蓮幾 個主要化學成分也與中藥黃芩類似,因此本研究進一步以醋酸扭體 法、福馬林舔足試驗及λ-carrageenan 足蹠腫脹法,探討半枝蓮及其成 分 scutellarein 之鎮痛及抗發炎藥理作用,最後測定 λ-carrageenan 誘 導足蹠腫脹小鼠之腫脹腳掌的MDA 及 NO 含量、肝組織中抗氧化酵 素(SOD、GSH-Rd、GSH-Px)活性,以探討 scutellarein 之抗發炎機轉。

獲得結果簡述如下:

ㄧ、八十七種中草藥對LPS 與 INF-γ 誘導巨噬細胞(RAW264.7)產生 NO 活性抑制之實驗中包括艾納香 Blumea balsamifera (L.) DC.

(IC50: 30.03 μg/mL); 鵝不食草 Centipeda minima (L.) A. Br. & Ascher. (IC50: 7.34 μg/mL); 馬藍 Kalimeris indica (L.) Sch. Bip.

(IC50: 32.37 μg/mL); 葉下珠 Securinega suffruticosa (Pall.) Rehd.

(IC : 26.12 μg/mL); 廣東紫花地丁 Gentiana loureirii (G. Don)

Griseb. (IC50: 13.5 μg/mL); 半枝蓮 Scutellaria rivularis Wall. (IC50: 38.28 μg/mL); 益母草 Leonurus artemisia (Lour.) S. Y. Hu (IC50: 37.46 μg/mL); 廣東香思子 Abrus cantoniensis Hance (IC50: 68.31 μg/mL); 龍鬚藤 Bauhinia championii (Benth.) Benth. (IC50: 40.47 μg/mL); 丁葵草 Zornia gibbosa Spanoghe (IC50: 40.12 μg/mL); 剛 毛尖子木 Oxyspora vagans (Roxb.) Wall. (IC50: 19.79 μg/mL); 地 瓜榕 Ficus tikoua Bur. (IC50: 17.51 μg/mL); 仙鶴草 Agrimonia

pilosa Ledeb. (IC

50: 27.44 μg/mL); 細葉水團花 Adina rubella

Hance (IC50: 3 μg/mL) 及深綠卷柏 Selaginella doederleinii Hieron.

(IC50: 47.11 μg/mL)等,共有 15 種中草藥對 LPS 與 INF-γ 誘導巨 噬細胞(RAW264.7)產生之 NO 含量有顯著的抑制作用,其抑制率 都在80%以上。半枝蓮成分 wogonin、baicalein、scutellarein 對 抑制NO 產生實驗中又以 scutellarein 效果最好,其 IC50為 12.7±3.11 μg/mL。

二、口服給予半枝蓮粗抽物(0.5, 1.0 mg/kg)均可減少由醋酸所引起 疼痛之扭體次數,顯示有鎮痛作用。腹腔注射scutellarein 明顯減 少由醋酸所引起疼痛之扭體次數,且以scutellarein (20 mg/kg)效 果最佳,顯示有鎮痛作用。

三、口服給予半枝蓮粗抽物對減少小鼠福馬林誘發前期之舔足反應時 間沒有明顯影響,但可明顯減少小鼠福馬林誘發後期之舔足反應 時間,顯示其具有週邊鎮痛作用,且以半枝蓮 (1.0g/kg)效果較 佳。腹腔注射scutellarein 對減少小鼠福馬林誘發前期之舔足反應 時間沒有明顯影響,但可明顯減少小鼠福馬林誘發後期之舔足反 應時間,顯示其具有週邊鎮痛作用。

四、口服給予半枝蓮粗抽物可明顯降低λ-carrageenan 誘導的急性足 蹠浮腫,顯示半枝蓮粗抽物具有抗發炎作用。腹腔給予scutellarein 可明顯降低λ-carrageenan 誘導的急性足蹠浮腫,顯示 scutellarein 具有抗發炎作用,其中以scutellarein (10 mg/kg)效果最佳。且 scutellarein 能明顯降低 NO、MDA 含量,及明顯提升 SOD、

GSH-Rd 抗氧化酵素的濃度,顯示 scutellarein 之抗發炎作用與提 升肝臟中抗氧化酵素之活性,因而減少MDA 與 NO 含量有關。

五、Scutellarein 對 LPS 與 INF-γ 誘導巨噬細胞(RAW264.7)產生之 NO 含量的抑制率明顯高於baicalein 與 wogonin,顯示其活性與 flavone 結構上氫氧基數量有關。

綜合上述結果顯示,利用LPS 與 INF-γ 誘導小鼠巨噬細胞

(RAW264.7)產生 NO 含量之抑制作用為指標,可篩選出具有抗發炎作 用之中草藥。半枝蓮及其成分 scutellarein 具有鎮痛與抗發炎作用,而 scutellarein 之抗發炎作用機轉,與提高肝臟中抗氧化酵素 (SOD 與 GSH-Rd) 之活性,並減少足蹠組織中之 MDA 與 NO 含量有關。

謝 辭

衷心感謝恩師吳金濱博士、謝明村博士及彭文煌博士不辭辛勞的 盡心指導,本論文方得順利完成,在此致上最誠摯的謝意。受業期間,

承蒙吳老師協助申請至日本大學進修,日本交流協會與國科會提供經 費,那段赴日進修的時光永生難忘;感謝謝校長如父執般的殷殷提 攜;彭老師如兄長般的殷切指導與關懷,受益恩情永銘於心。由衷感 謝陳教授介甫博士、吳教授午龍博士、陳主任忠川博士、張所長永勳 博士於論文審查時所賜寶貴建議,使本論文更臻完善。更感謝張所長 的提拔,推廣教育中心九年的行政經驗讓我成長許多,鼓勵並提供我 良好的進修環境;日本大學生藥學研究室北中進教授提供一氧化氮研 究方法與優良的研究環境,王立岩博士、王玨博士在實驗上的指導;

瀋陽藥科大學姚新生教授提供部分藥材樣本,孫啟時教授、吳維春教 授協助鑑定藥材;謝教授文全博士、邱年永老師協助採集與鑑定植 物,葉副教授豐次博士、黃副教授順爵博士、郭副教授昭麟博士、黃 副教授太鴻博士給予的提攜與教導。

感謝臻里生物科技股份有限公司協助抽取半枝蓮。感謝動物中心 王技士文信先生、中藥所藥理實驗室立偉、泛修、皓元、宗俊、宜璇、

信維、冠麟、芸禎、熒駿、承瑋、藥化所植化實驗室惠雅、致群、雯

茹、釗偉、勝紘、柏雄等學弟妹們的協助,能與大家一起做實驗,是 我最愉快的時光。博士班同學賴副教授妙英博士、柯助理教授裕仁博 士、謝助理教授長奇博士、高國清博士、碩士班同學黃助理教授雯雯 博士、大學同學張助理教授文德博士、余副教授建志博士,以及慧敏、

惠貞、宜文、淑華、淑瓊、夙真、玲珊等諸多好友,謝謝你們給我的 關懷與鼓勵。

七年的時光雖然有些波折,但我心中充滿感恩,感恩這一路上所 有陪我走過來的朋友們。感恩我的先生、我無話不談的好朋友林昆宏 醫師,多年來以實際行動支持我在職進修,總在我想要放棄的時候拉 我ㄧ把,鼓勵我不論有多艱苦也要完成學業;感恩我三個乖巧貼心的 小孩汝穎、汝潔、伯勳,媽媽終於畢業了;感恩公公林資湖先生、婆 婆洪素鶯女士對我如女兒般的照拂,讓我時時感受到溫暖。

最後謹以本論文獻給四十年來始終疼愛我的父親廖福麟先生、母 親鍾秀琴女士及愛護我的大哥廖芳俊、二哥廖廷尉,由於您們多年來 的關懷與支持,讓我終於完成此人生重要的階段。

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