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德國(guó)Ionovation公司生產(chǎn)的Ionovation 電生理分析系統(tǒng)(單細(xì)胞膜片鉗),是該領(lǐng)域zui新的產(chǎn)品之一,該產(chǎn)品克服了傳統(tǒng)膜片鉗的一系列缺點(diǎn),無(wú)論從產(chǎn)品的技術(shù)含量還是從產(chǎn)品的應(yīng)用領(lǐng)域上來(lái)看,在電生理分析技術(shù)中始終處于ling先的地位,代表著電生理分析技術(shù)發(fā)展的方向,是國(guó)內(nèi)外細(xì)胞電生理分析實(shí)驗(yàn)室shou選實(shí)驗(yàn)儀器。 系統(tǒng)介紹 中文名稱:Ionovation Compact 單細(xì)胞膜片鉗自定義環(huán)境電生理分析系統(tǒng); Innovation 單細(xì)胞膜片鉗定義環(huán)境中重組分子進(jìn)行電生理分析的可靠工具。這種高度靈活的桌面檢測(cè)系統(tǒng)可適應(yīng)多種實(shí)驗(yàn)條件,目前已經(jīng)被用于對(duì)細(xì)胞膜離子通道、多種動(dòng)物和植物轉(zhuǎn)運(yùn)蛋白和它們的細(xì)胞器進(jìn)行研究。(詳見(jiàn)參考文獻(xiàn)可案例部分)
產(chǎn)品背景:
細(xì)胞膜離子通道是*古老的功能蛋白之一,廣泛存在于從細(xì)菌到植物到動(dòng)物包括人類在內(nèi)的生物界,是許多基本生物活動(dòng)如電活動(dòng)、離子轉(zhuǎn)運(yùn)和細(xì)胞分泌等的基礎(chǔ)。對(duì)于人類而言,由離子通道參與的功能(如電活動(dòng))是神經(jīng)及心血管等系統(tǒng)生理功能的*基本形式之一。對(duì)離子通道功能調(diào)節(jié)機(jī)制的深入研究是了解其生理學(xué)和生理病理學(xué)意義的關(guān)鍵所在。
膜片鉗技術(shù)是用玻璃微電極吸管把只含1-3個(gè)離子通道、面積為幾個(gè)平方微米的細(xì)胞膜通過(guò)負(fù)壓吸引封接起來(lái),由于電極頭部與細(xì)胞膜的高阻封接,在電極頭部籠罩下的那片膜事實(shí)上與膜的其他部分從電學(xué)上隔離,因此,此片膜內(nèi)開放所產(chǎn)生的電流流進(jìn)玻璃吸管,用一個(gè)極為敏感的電流監(jiān)視器(膜片鉗放大器)測(cè)量此電流強(qiáng)度,就代表單一離子通道電流。膜片鉗技術(shù)發(fā)展至今,已經(jīng)成為現(xiàn)代細(xì)胞電生理的常規(guī)方法。但是隨著研究的深入,目前發(fā)現(xiàn)傳統(tǒng)膜片鉗主要有以下缺點(diǎn):
·測(cè)量非常耗時(shí)
·需要高度熟練的操作者來(lái)進(jìn)行實(shí)驗(yàn)
·需要建立千兆歐姆的封阻,但是千兆歐姆的封阻在測(cè)試時(shí)不穩(wěn)定
·并不是所有離子通道都可以被測(cè)試,一般是配體或者在一側(cè)可以交換緩沖液的才可以被測(cè)量
·膜片鉗無(wú)法對(duì)細(xì)胞器進(jìn)行分析
·在測(cè)量過(guò)程中的細(xì)胞往往形成穿孔
·結(jié)果在穩(wěn)定背景下經(jīng)過(guò)多次測(cè)量形成平均值,測(cè)量值離散度大
Ionovation 單細(xì)胞膜片鉗比傳統(tǒng)膜片鉗的優(yōu)勢(shì)主要在于:
·不需要建立千兆歐姆的封阻
·是wei一一種采用雙層封阻的測(cè)量方式
·可用于檢測(cè)各種細(xì)胞膜上的離子通道、囊泡、配體
·容易實(shí)現(xiàn)對(duì)單個(gè)離子通道進(jìn)行分析檢測(cè)
·可以在膜的兩側(cè)改變條件,形成雙信道進(jìn)行分析
參考文獻(xiàn)
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