Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3841
標題: 以Michaelis-Menten機制模擬軸突內物質的主動傳輸
A Simulation Study on Active Transport of Biomolecules in Axons Using the Michaelis-Menten Mechanism
作者: 林義珉
Lin, I-Ming
關鍵字: microtubule
微小管
molecular motor
active transport
axon
分子馬達
主動傳輸
軸突
出版社: 化學工程學系所
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摘要: 在神經細胞中,因為軸突的特殊性,所以物質的傳遞是維持機能的一個重要機制,例如一些神經退化性疾病的病症中會發現軸突澎潤或球體的形成,被認為與軸突傳輸有相當深切的關係。神經細胞軸突中物質輸送共分為兩種,一種是小分子以布朗運動的方式在軸突裡自由的移動,如ATP在軸突裡的輸送;另一種則是物質與一種稱為分子馬達的馬達蛋白結合,馬達蛋白利用ATP水解所產生的能量,拖曳物質沿者細胞骨架移動,稱為軸突輸送,例如神經傳送物質、細胞骨架聚合物等等。由Smith和 Simmons所提出的數學模是假設粒子的速度是穩定的。與先前文獻的模式比較,本研究將額外增加一個ATP的連續方程式,此方程式是描述ATP濃度的分布,且利用Michaelis - Menten動力學來推導馬達蛋白的速度,藉此使巨觀的軸突傳輸系統朝向更真實的方向前進。本研究將會呈現抑制驅動蛋白、抑制細胞質動力蛋白和沒有抑制馬達蛋白所呈現的粒子分布狀態,最後並與文獻做比較。
Intracellular transport is an important mechanism to maintain neural function because of axonal specificity. For example, we found axonal swelling or the formation of spheroid in neurodegenerative diseases, and axonal transport is considered the important factor for neurodegenerative diseases. Axonal transport of biomass is divided into two in neuron. The former is that small molecules diffuse freely in the axon, such as the transport of ATP in cells. The latter is that cargo (organelles or viscles) associated with motor proteins. Motor proteins use the energy generated by ATP hydrolysis, and drag cargo along the cytoskeleton movement. It is called axonal transport, such as neurotransmitter, cytoskeletal polymers and so on. Mathematical model proposed by Smith and Simmons assumes that the velocity of particles is constant. Compared with the previous model, this study adds the continuity equation for species ATP to describe the distribution of ATP concentration, and uses Michaelis-Menten kinetics to derive the velocity of the motor protein. This study simulates distribution of the particles due to the inhibition of kinesin, inhibition of dynein and both. Results are compared with the literatures.
URI: http://hdl.handle.net/11455/3841
其他識別: U0005-2308201016273800
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2308201016273800
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