研究生: |
賴瀅如 Lai, Ying-Ju |
---|---|
論文名稱: |
探討CSC-3436經由Twist/Bmi1/Akt 訊息路徑抑制頭頸鱗狀上皮癌的上皮細胞間質轉換現象 CSC-3436 Inhibits Twist-Induced Epithelial-Mesenchymal Transition via the Suppression of Twist/Bmi1/Akt Pathway in Head and Neck Squamous Cell Carcinoma |
指導教授: |
陳炯東
Chen, Chiung-Tong 魏宗德 Way, Tzong-Der 莊永仁 Chuang, Yung-Jen |
口試委員: |
張文祥
Chang, Wun-Shaing 馬念涵 Ma, Nian-han 李易展 Lee, Yi-Jang |
學位類別: |
博士 Doctor |
系所名稱: |
生命科學暨醫學院 - 生物資訊與結構生物研究所 Institute of Bioinformatics and Structural Biology |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 英文 |
論文頁數: | 76 |
中文關鍵詞: | 頭頸鱗狀上皮癌 、上皮細胞間質轉換 、癌症幹細胞 |
外文關鍵詞: | Head and neck squamous cell carcinoma (HNSCC), Epithelial-mesenchymal transition (EMT), Bmi1, CSC-3436 |
相關次數: | 點閱:2 下載:0 |
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頭頸部鱗狀細胞癌(HNSCC)占全球癌症好發率的第六位,而在先進國家則為第三位,尤其發生於男性。20% HNSCC患者即使接受化療和靶向治療仍舊發生腫瘤復發和轉移,導致預後不良,研究顯示與產生腫瘤復發和轉移過程有極大相關,即為上皮細胞間質轉換現象(EMT)。我們將HNSCC FaDu細胞大量異位表達在EMT過程中極為關鍵的轉錄因子Twist蛋白 (FaDu-pCDH-Twist cells),使其產生EMT、增加細胞遷移/侵襲能力,並誘發腫瘤幹細胞(CSCs)能力作為研究模型,研究結果顯示將FaDu-pCDH-Twist細胞以新合成的CSC-3436 (黃酮類化合物)處理, 可造成癌細胞形態改變回正常上皮細胞型態,回復Fadu-pCDH-Twist 細胞中下降的E-鈣粘蛋白 (E-cadherin) mRNA和蛋白表現,下調N-鈣粘蛋白 (N-cadherin),波形蛋白 (vimentin) 和CD133(腫瘤幹細胞表面標誌蛋白)。此外,CSC-3436亦可直接減少Bmi1蛋白表達,並進一步抑制Twist蛋白和Bmi1蛋白對E-鈣粘蛋白的直接共同調節作用,另外我們使用抑制劑證實,在Fadu-pCDH-Twist 細胞中,CSC-3436經由抑制Twist / Bmi1 / Akt訊息路徑降低了EMT、遷移/侵襲與誘發腫瘤幹細胞能力。我們的研究結果在HNSCC治療上提供了一個新的證據,即CSC-3436可直接抑制Bmi1蛋白表現及Bmi1在HNSCC中的致癌分子途徑,這項發現對於HNSCC患者在治療和未來預後追蹤上也扮演極重要價值。
Head and neck squamous cell carcinoma (HNSCC) is one of the leading causes of cancer deaths worldwide, especially in male. 20% HNSCC patients undergo tumor recurrence and metastasis even with chemotherapy and targeted therapy, resulting in a poor prognosis. Twist, a key transcriptional factor of epithelial-mesenchymal transition (EMT), was ectopically expressed in HNSCC FaDu cells, which triggered EMT and resulted in the acquisition of a mesenchymal phenotype as a cell model in this thesis. Our results demonstrated that treatment with newly synthesized CSC-3436, a flavonoid derivative, reduced Twist-induced scattering of its cell morphology, upregulated E-cadherin mRNA and protein expression, downregulated N-cadherin, vimentin, and CD133 (a marker associated with tumor-initiating cells) in FaDu-pCDH-Twist cells. Moreover, CSC-3436 exposure reduced Bmi1 expression regulated by Twist and further suppressed the direct co-regulation of E-cadherin by Twist and Bmi1. Interestingly, CSC-3436 reduced EMT, cancer stemness and migration/invasion abilities through the inhibition of Twist/Bmi1/Akt pathway. Most importantly, our findings provide a new evidence that CSC-3436 plays a crucial role in therapeutic targeting to Bmi1 and its molecular pathway in HNSCC and will be valuable in prognostic prediction and treatment.
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