https://scholars.lib.ntu.edu.tw/handle/123456789/124602
標題: | 蛋白質交互作用網路中的動態模組及調控 Dynamic Modularity and Regulation in Protein Interaction Networks |
作者: | 林振慶 Lin, Chen-Ching |
關鍵字: | 蛋白質交互作用網路;信使核醣核酸表現量;微型核醣核酸調控;整合型網路分析;動態模組特性;微型核醣核酸調控網路;protein interaction network;mRNA expression profile;microRNA regulation;integrative network analysis;dynamic modularity;microRNA-regulated network | 公開日期: | 2012 | 摘要: | 蛋白質交互作用網路可用來呈現細胞內分子間活動的基礎架構並且提供了解疾病可能機制的契機。信使核醣核酸的表現量以及微型核醣核酸的調控會影響蛋白質的量,進而影響蛋白質交互作用網路中的每筆交互作用。因此,我們結合蛋白質交互作用網路、信使核醣核酸的表現量以及微型核醣核酸的調控發展出一套整合型的分析方法,並利用這套方法去探討蛋白質交互作用網路中的動態模組性以及微型核醣核酸調控的特定蛋白質交互作用網路。 在分析動態模組性方面,藉由整合擴張型心肌病變病人的信使核醣核酸表現量與蛋白質交互作用的資料,我們發現在正常及疾病的樣本間有大量的交互作用發生重新連結的現象,這可能揭露了隱含於靜態交互作用網路中的動態資訊。我們更發現了兩個與心臟衰竭相關的功能性網路模組,而這兩個模組在正常及疾病樣本間的動態特性更進一步地提供了一個潛在的擴張型心肌病變的分子機制。 在微型核醣核酸方面,藉由整合微型核醣核酸的調控目標基因以及蛋白質交互作用網路,我們發展了一套方法來發掘出微型核醣核酸調控的交互作用網路以及預測它們在特定情況下的功能。另外,運用這個方法在胃癌的研究中也發現了幾個與癌症的發展有關的微型核醣核酸調控網路。進一步的分析更發現這些微型核醣核酸具有抑制胃癌腫瘤的可能性。其中,miR-148a更可以透過其調控目標去減少癌細胞的侵略、遷移以及附著的能力來降低癌細胞的增生及轉移。 在此我們提出了一個新方法去探索不同情況下蛋白質網路中的動態模組性及微型核醣核酸調控機制,也成功找到了和心臟衰竭高度相關的網路模組及具抑制胃癌腫瘤潛力的微型核醣核酸。最後,這些找到的網路模組及微型核醣核酸調控的蛋白質網路可能可以作為新的藥物標靶和提供治療心臟衰竭及胃癌的新方向。 Protein interaction networks can represent the backbone of molecular activity within cells and thus provide opportunities for understanding the mechanism of diseases. Through their influence on protein abundance, mRNA expression and microRNA regulation can affect the interaction dynamics within protein networks. Therefore, we developed an integrative analysis of protein interaction network by incorporating mRNA expression and microRNA regulation to reveal the dynamic modularity and microRNA-regulated networks in protein interaction networks. For the dynamic modularity analysis, we integrated mRNA expression profiles of a cohort of dilated cardiomyopathy patients with protein-protein interactions and found a large amount of interaction rewiring between normal and disease samples. It might suggest that the condition-specific dynamic information hid among otherwise common static interactions. We identified two heart-failure related functional modules that significantly emerged from the protein interaction networks. Additionally, the dynamic change of these modules between normal and disease states further suggested a potential molecular model of dilated cardiomyopathy. For microRNA regulations, we integrated the information of microRNA expression, target mRNA expression, and target protein-protein interaction and developed an approach to reveal microRNA-regulated protein interaction networks and to determine their functional roles in specific biological conditions. Applying this approach to investigate gastric tumor samples revealed several microRNA-regulated networks which were enriched in functions related to cancer progression. Further analyses showed that these microRNAs could be potential tumor suppressors of gastric cancer. Among them, miR-148a decreased tumor proliferation and metastasis by reducing the invasiveness, migratory and adhesive activities of tumor cells through its targets. In conclusion, we proposed a novel framework to discover the dynamic modularity and microRNA regulation embedded in the protein interaction networks in different biological states. It successfully revealed network modules closely related to heart failure and potential tumor suppressor microRNAs involved in gastric cancer. The revealed molecular modules and microRNA-regulated networks might be able to be used as potential drug targets and provide new directions for heart failure and gastric cancer therapy. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/250057 |
顯示於: | 生醫電子與資訊學研究所 |
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ntu-101-D96945017-1.pdf | 23.32 kB | Adobe PDF | 檢視/開啟 |
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