| 研究生: |
楊皓安 Yang, Diane |
|---|---|
| 論文名稱: |
探討KLF10調控COX-1在血管內皮細胞之功能與特性 Functional characterization of KLF10 signaling-modulated gene, COX-1, in endothelial cells |
| 指導教授: |
王建平
Wang, Jiann-Ping |
| 學位類別: |
碩士 Master |
| 系所名稱: |
生物科學與科技學院 - 生命科學系 Department of Life Sciences |
| 論文出版年: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 英文 |
| 論文頁數: | 48 |
| 中文關鍵詞: | 血管新生 、內皮細胞 、環氧合酶-1 |
| 外文關鍵詞: | KLF10, COX-1, Angiogenesis |
| 相關次數: | 點閱:83 下載:1 |
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Krüppel-like family (KLF) 為一群含有鋅指 (zinc finger) 結構的轉錄因子,並藉與目標基因啟動子直接結合的機制調控其轉錄,進而恆定許多重要的生理功能如生長發育、細胞分化及血管生成等。KLF家族中的成員之一,KLF10,已知在 TGF-beta 的訊息傳遞路徑中扮演著重要的角色。近來研究指出 KLF10 在 TGF-beta 的刺激下調控骨髓中 pro-angiogenic cells (PAC) 的分化,分化後的 PAC再藉由體內循環到組織受傷處進行血管新生以修復傷口;另一方面 KLF10 的基因剔除小鼠在上肢缺血手術實驗 (hindlimb ischemia) 後無法藉由血管新生回復被截斷的血流。此外 KLF10 的基因剔除小鼠於 Matrigel plug assay 顯示明顯的血管新生缺陷。這些新發現皆顯示KLF10參與在血管生成的過程中,但 KLF10 所涉及的血管新生成路徑仍尚未明瞭。
試驗以染色體免疫沉澱晶片 (ChIP-chip) 分析可能受 KLF10 調控的下游基因,其中環氧合酶-1 [cyclooxygenase 1 (COX-1; prostaglandin - endoperoxide synthase 1; PTGS1)] 為 KLF10 為眾目標基因之一。本論文陸續以啟動子活性分析(promoter activity assay)、電泳遷移率實驗 (electrophoretic mobility shift assay ; EMSA) 及染色質免疫共沉澱與聚合酶鏈鎖反應 (ChIP-PCR) 等實驗,先行確認了KLF10/COX-1 兩者間的調控關係,結果顯示 KLF10 可藉由結合到 COX-1 基因啟動子之 Sp/KLF 結合序列,以活化 COX-1 起動子轉錄。COX-1 在一般細胞中已知可催化前列腺素的生成反應,在血管內皮細胞能促使其進行血管新生,而在血小板則催化花生四烯酸 (arachidonic acid, AA) 所引起的血小板凝集。由反轉錄聚合酶鏈鎖反應 (RT-PCR) 與西方墨點染色法 (Western blot) 結果證實 KLF10 調控血管內皮細胞 COX-1 mRNA及蛋白質的表現。此外,為了深入探討 KLF10 所造成的影響是否也會反映在 COX-1 的功能上,論文再利用人類血管內皮細胞以細管形成試驗 (tube formation assay) 來評估血管新生;由結果發現在大量表現 KLF10 的基因轉染血管內皮細胞較控制組更快速並形成更多的血管管狀結構,此結果可被 COX-1 選擇性抑制劑 valeryl salicylate (VSA) 所壓抑。論文最後分析,KLF10 基因剃除鼠血小板亦如推測其凝集能力較正常小鼠者來的差。綜合上述的結果,KLF10 可藉由調控 COX-1 的表現量來進一步促使血管新生成以及血小板凝集。
TGF-beta is a vital cytokine known to participate in vascular formation and angiogenesis processes by modulating its several downstream factors. One of the TGF-beta inducible gene, Krüppel-like factor 10 (KLF10), is a zinc-finger transcription factors which play key regulatory roles in cellular growth, development, differentiation etc. Recent study has shown that KLF10 is involved in the process of angiogenesis by acting as a key transcriptional regulator of TGF-beta1 in pro-angiogenic cells (PAC) differentiation and function. KLF10–/– mice also displayed impaired blood flow recovery after hindlimb ischemia. However, the mechanism of KLF10 induced angiogenesis is still not well understood. From our ChIP-chip result, which have been adopt to elucidate the novel target genes and signaling cascades of KLF10, cyclooxygenase 1 (COX-1; prostaglandin-endoperoxide synthase 1; PTGS1) was identified to be one of the target genes that may be regulated by KLF10 through direct promoter binding. In order to investigate the function of KLF10/COX-1 axis, promoter activity, EMSA, ChIP-PCR, tube formation assays and platelet aggregation assays were serially performed. Using luciferase reporter assays, KLF10 was found to activate COX-1 promoter activity when overexpressed KLF10 in both endothelial cells: bEnd-3 and HUVEC. In the same experiment, the expression levels of COX-1 mRNA and protein were up-regulated by KLF10 transfected. It is known that COX-1 is the key enzyme in prostaglandin biosynthesis which further regulated angiogenesis in endothelial cells. In tube formation assay, KLF10 overexpressed endothelial cells formed organized tube-like structure better than in contrast to the control group. This KLF10-induced tube formation could be repressed by COX-1 selected inhibitor- valeryl salicylate. Moreover, KLF10-deficient mice perform weaker arachidonic acid-induced platelet aggregation. In sum, these results indicate an important role for KLF10 in angiogenesis and platelet aggregation through the activation of COX-1.
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