本文選題：酸感受離子通道2a + 酸感受離子通道3　； 參考：《沈陽藥科大學》2007年碩士論文

【摘要】： 酸感受離子通道(acid-sensing ion channels，，ASICs)是一類由胞外酸化所激活的陽離子通道，屬于真皮鈉離子通道家族。至今已經(jīng)克隆出這個家族7個不同亞基：ASIC1a；ASIC1b；ASIC1b2；ASIC2a；ASIC2b；ASIC3和ASIC4。ASICs在體內(nèi)分布廣泛，功能復(fù)雜。其中ASIC2a和ASIC3因在酸味覺、觸覺、疼痛等方面具有重要的生理學功能和病理學意義而逐漸成為研究熱點。 本實驗應(yīng)用分子生物學技術(shù)，成功構(gòu)建大鼠ASIC2a和ASIC3全長表達質(zhì)粒。將編碼ASIC2a和ASIC3亞基的cRNA分別注射到爪蟾卵母細胞中，使其表達并組成ASIC2a和ASIC3的同聚體離子通道，使用雙電極電壓鉗技術(shù)記錄H~+誘發(fā)電流，分析電流的藥理學和門控動力學特征，觀察Ca~(2+)、Na~+及K~+離子對H~+誘發(fā)電流的影響。研究發(fā)現(xiàn)：降低胞外液pH值可誘導(dǎo)出內(nèi)向電流，pH值越小H~+誘發(fā)的電流幅度越大。ASIC2a的pH_(50)為5.12，ASIC3的pH_(50)為5.83。ASIC2a的內(nèi)向電流具有穩(wěn)態(tài)失活成分，ASIC3的內(nèi)向電流具有快速和穩(wěn)態(tài)失活兩種成分。提高胞外Ca~(2+)濃度可降低H~+誘發(fā)的電流幅度。胞外Ca~(2+)對ASIC2a和ASIC3抑制作用的IC_(50)分別為11.98 mmol/L和9.16 mmol/L。ASIC2a和ASIC3除了對Na~+通透外，對K~+也具有一定程度的通透。 本實驗以爪蟾卵母細胞為表達載體，成功建立了ASIC2a和ASIC3離子通道表達細胞模型，系統(tǒng)的觀察了ASIC2a和ASIC3同聚體離子通道的電生理學特性及不同離子對其功能的影響。本研究結(jié)果不僅有利于進一步加深對ASICs生物學特性的了解，而且也為靶向ASICs類藥物的研發(fā)提供了較為理想的篩選和評價技術(shù)平臺。
[Abstract]:Acid-sensing ion channels are a kind of cationic channels activated by extracellular acidification and belong to the dermal sodium ion channel family. Up to now, seven different subunits of this family have been cloned: ASIC1b, ASIC1b2, ASIC2b2, ASIC2b, ASIC3 and ASIC4.ASICs, which are widely distributed and have complex functions in vivo. Among them, ASIC2a and ASIC3 have become the research focus because of their important physiological function and pathological significance in acid sense, tactile sense, pain and so on. In this study, the full length expression plasmids ASIC2a and ASIC3 were successfully constructed by molecular biology. The cRNA encoding ASIC2a and ASIC3 subunits were injected into Xenopus oocytes to express and form the homopolymer ion channels of ASIC2a and ASIC3 respectively. The H- induced currents were recorded by double electrode voltage clamp technique, and the pharmacological and gated characteristics of the currents were analyzed. The effects of Na ~ and K ~ + on H ~ -induced currents were observed. It was found that the lower the pH value of extracellular solution was, the greater the amplitude of inward current was. The pH of ASIC2a was 5.12 and the pH of ASIC3 was 5.83. The inward current of ASIC2a had two components: fast and steady-state inactivation. The increase of extracellular Caan2 concentration can reduce the amplitude of H- induced currents. The inhibitory effects of extracellular Caanzao 2 on ASIC2a and ASIC3 were 11.98 mmol / L and 9.16 mmol / L ASIC2a and ASIC3, respectively. The ASIC2a and ASIC3 ion channel expression cell models were successfully established using Xenopus oocytes as expression vector. The electrophysiological characteristics of ASIC2a and ASIC3 homopolymer ion channels and the effects of different ions on their function were systematically observed. The results of this study not only help to further understand the biological characteristics of ASICs, but also provide an ideal platform for screening and evaluation of targeted ASICs drugs.
【學位授予單位】：沈陽藥科大學
【學位級別】：碩士
【學位授予年份】：2007
【分類號】：R33

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本文編號：2011101