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研究生:莊賢凱
研究生(外文):Shien-Kai
論文名稱:蟛蜞菊內酯及去甲基蟛蜞菊內酯抑制乳癌細胞轉移及其作用機制之研究
論文名稱(外文):Experimental anti-metastic potential and mechanism of wedelolactone and demethylwedelolactone in MDA-MB-231 cells
指導教授:曾翠華曾翠華引用關係
指導教授(外文):Tsui-Hwa Tseng
學位類別:碩士
校院名稱:中山醫學大學
系所名稱:應用化學系碩士班
學門:自然科學學門
學類:化學學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:119
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本實驗室先前證實蟛蜞菊學名的乙酸乙酯層粗萃物(EAW)具有抑制乳癌(Breast cancer)增生之影響,因此,本研究進一步探討EAW主成分蟛蜞菊內酯(Wedelolactone;WEL)和去甲基蟛蜞菊內酯 (Demethylwedelolactone;DWEL) 對乳癌細胞 (MDA-MB-231) 侵移及轉移影響的相關藥理及分子機制。首先,我們經由細胞毒性分析和細胞週期測定,發現蟛蜞菊主成份 (WEL and DWEL)可以有效抑制MDA-MB-231乳癌細胞生長,另外經由5-脂氧合酶活性測定、前列腺素含量測定、反轉錄聚合酶鏈鎖反應和免疫點墨法,結果顯示 WEL 和 DWEL 具有抑制發炎反應之潛能,另外,利用血清誘發乳癌細胞侵移的模式來研究 WEL 和 DWEL 對乳癌細胞 MDA-MB-231 侵移特性的影響,結果顯示 WEL 和 DWEL 可抑制乳癌細胞株發散、移動、侵犯…等現象,接著我們以免疫點墨法評估 WEL 和 DWEL 對血清所誘導活化與侵犯性生長有關訊息路徑的影響,結果顯示 WEL 和 DWEL 可以抑制血清誘導的 VEGF、ERK、Akt和IкB-α 磷酸化表現,但不影響 JNK、p38 的磷酸化。在癌細胞移轉的過程當中MMP (基質金屬蛋白酵素)扮演重要的角色,所以我們利用凝膠酶譜法和免疫點墨法分析癌細胞其 MMP-2、-9 和 uPA 表現狀況,結果發現,WEL 和 DWEL會抑制 MMP-2、-9 和 uPA 的活性及表現。此外,組蛋白乙醯化作用在調控基因轉錄上扮演重要的角色,經由組蛋白去乙醯化作用造成染色體不活化,涉及了許多抑癌基因的轉錄抑制,本研究發現 WEL 和 DWEL 可增加 H3 組蛋白乙醯化進而促進 RECK 蛋白的表現,最後我們利用動物模式,研究 DWEL 對乳癌細胞在裸鼠中肺部移生的影響,結果發現 DWEL 有意義減少肺部的大小及重量和肺部移生的現象。此外,我們第一次證實無論在體外或體內,DWEL 隨著處理劑量的增加皆可以降低 MMP-2,提升TIMP1、TIMP2 蛋白的表現量,綜合以上的結果,顯示WEL和 DWEL 的抗癌活性涉及了 IKK 和 PI3K/Akt 訊息路徑的影響及經由組蛋白乙醯化的修飾而增加 RECK 表現,進而抑制乳癌細胞的侵移及轉移。

Our laboratory has previously confirmed the ethyl acetate extract of Wedelia chinensis (EAW) can restrain the proliferation of breast cancer cells. The present study is further to explore the main components of EAW, wedelolactone (WEL) and demethylwedelolactone (DWEL), invasion and metastasis of breast cancer cells. First of all, we found WEL and DWEL exhibited anti-proliferation effect on MDA-MB-231 breast cancer. We also found that WEL and DEWL have anti-inflammatory potential by 5-lipoxygenase activity assay, PGE2 assay, RT-PCR and western blot analysis. While the effect of WEL and DWEL on the suppressing breast cancer invasion and metastasis is poorly understood. Therefore, we use Fetal bovine serum (FBS) as an invasive inducer to investigate the effect of WEL and DWEL on invasive growth of MDA-MB-231 human breast cancer cells. The results showed WEL and DWEL inhibited the cell scattering, motility and invasion. The effect of WEL and DWEL on FBS-induced signaling activation involving invasive growth was evaluated by immunoblotting analysis. It showed that WEL and DWEL blocks the inhibited VEGF, ERK, Akt and IкB-α phosphorylation expression but not JNK and JNK phosphorylation. Evidenced showed that metalloprotease (MMPs) play important role in breast cancer cells migration and invasion. We performed zymography assay and western to investigate whether WEL and DWEL inhibits MMP-2, -9 and uPA activity and expression. WEL and DWEL showed inhibitory effect on MMPs activity as well as on MMP-2 and MMP-9 expression. Furthermore, histone acetylation appeared to play an important role in transcriptional regulation. The study found WEL and DWEL enhanced histone H3 acetylation to promote RECK protein expression, which may associat with activation of MMPs. Finally, we use animal models to study DWEL on lung colonization of MDA-MB-231 cells in nude mice. The results showed DWEL significantly reduced the size and weigth of lung as well as lung colonization. By immune blotting analysis, DWEL displayed concentration-dependent in reduction of MMP-2 and increase of TIMP1, TIMP2. Taken together, the study showed the inhibition of IKK and PI3K/Akt signaling pathways by WEL and DWEL anti-invasion and activity of WEL and DWEL by modulating of histone acetylation increase RECK expression to inhibit breast cancer cell invasion and metastasis. Take together the result show anti-invasion and anti-metastsis activity of WEL and DWEL in breast cancer are associated with inhibition of signaling pathway and promotion of chromatin remodeling.

目錄
縮寫表 II
中文摘要 1
ABSTRACT 3
壹、 緒論 5
一、 背景介紹 5
1. 癌症(Cancer) 5
2. 乳癌 (Breast cancer) 7
二、 藥物介紹 9
三、 細胞訊息傳遞 11
1. 第二型環氧化酵素之表現與功能 11
2. MAP Kinases pathway 12
3. 細胞核蛋白 NF-кB 13
4. Matrix metalloproteinases ( MMPs ) 15
5. Tissue inhibitors of metalloproteinases (TIMPs) 17
貳、 研究動機與架構19
研究架構 20
参、 實驗材料和方法 21
一、 實驗化學藥劑 21
二、 抗體 23
三、 實驗器材 25
四、 常用儀器 26
肆、 實驗方法 27
伍、 實驗結果 38
柒、 討論 53
陸、 參考文獻 57
柒、 圖表與說明 63
捌、 附圖 116





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