| 研究生: |
許修瑞 Hsu, Xiu-Rui |
|---|---|
| 論文名稱: |
胞外泌體中的長鏈非編碼RNA MLETA1透過調節非小細胞肺癌中的miR-186-5p/EGFR和miR-497-5p/IGF1R路徑促進腫瘤進展和轉移 Exosomal long noncoding RNA MLETA1 promotes tumor progression and metastasis by regulating the miR‑186‑5p/EGFR and miR‑497‑5p/IGF1R axes in non‑small cell lung cancer |
| 指導教授: |
洪澤民
Hong, Tse-Ming |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
醫學院 - 臨床醫學研究所 Institute of Clinical Medicine |
| 論文出版年: | 2024 |
| 畢業學年度: | 112 |
| 語文別: | 英文 |
| 論文頁數: | 116 |
| 中文關鍵詞: | lnc-MLETA1 、肺癌轉移 、胞外泌體 、miR-186-5p 、miR-497-5p 、上皮成長因子接受器 、胰島素樣生長因子1受體 |
| 外文關鍵詞: | lnc-MLETA1, Lung cancer metastasis, exosome, miR-186-5p, miR-497-5p, IGF1R, EGFR |
| 相關次數: | 點閱:53 下載:0 |
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肺癌是全世界最常見且死亡率最高的癌症,腫瘤轉移約佔肺癌相關死亡的 90%。腫瘤來源的胞外泌體透過傳遞對該過程至關重要的分子而成為轉移的潛在促進劑。然而,胞外泌體長鏈非編碼RNA(lncRNA)在肺癌轉移中的作用和機制有很大程度地不清楚。我們的研究發現,來自高轉移性肺癌細胞的胞外泌體增強了低轉移性肺癌細胞的遷移和侵襲能力。透過胞外泌體lncRNA定序(lncRNA-seq),我們發現了一種新型lncRNA,lnc-MLETA1,它在高度轉移細胞及其胞外泌體中大量表現。lnc-MLETA1的過度表現增強了肺癌細胞的遷移和侵襲,而lnc-MLETA1的抑制則降低了細胞的運動和轉移。有趣的是,胞外泌體所介導的lnc-MLETA1傳遞促進了肺癌細胞的運動和轉移,而用lnc-MLETA1專一性的LNA可以消除這種現象。在機制方面,lnc-MLETA1透過與miR-186-5p 和 miR-497-5p 的交互作用來調節EGFR和IGF1R的表達,從而促進細胞運動。臨床數據表明,肺癌患者血漿中胞外泌體的lnc-MLETA1表現與轉移呈正相關,表明其具有作為肺癌診斷和治療的預後生物標記和治療標靶的潛力。
Lung cancer stands as the most prevalent and deadliest form of cancer worldwide, with tumor metastasis accounting for about 90% of lung cancer-related deaths. Tumor-derived exosomes have emerged as potential facilitators of metastasis by delivering molecules crucial for this process. However, the role and mechanism underlying exosomal long noncoding RNA (lncRNA) in lung cancer metastasis remain largely elusive. Our study reveals that exosomes from highly metastatic lung cancer cells enhance the migration and invasion capabilities of low-metastatic lung cancer cells. Through exosomal lncRNA sequencing (lncRNA-seq), we identified a novel lncRNA, lnc-MLETA1, upregulated in highly metastatic cells and their exosomes. Overexpression of lnc-MLETA1 amplified lung cancer cell migration and invasion, while its knockdown decreased cell motility and metastasis. Interestingly, exosome-mediated transfer of lnc-MLETA1 promoted lung cancer cell motility and metastasis, which was abrogated by targeting lnc-MLETA1 with an LNA. Mechanistically, lnc-MLETA1 modulated EGFR and IGF1R expression by binding miR-186-5p and miR-497-5p, thereby facilitating cell motility. Clinical data indicated a positive correlation between plasma exosomal lnc-MLETA1 levels and metastasis in lung cancer patients, suggesting its potential as a prognostic biomarker and therapeutic target for lung cancer diagnosis and treatment.
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