產(chǎn)品描述:
Screen Quest檢測(cè)試劑盒是一類用于檢測(cè)各種細(xì)胞離子通道以及電位等系列工具,包括膜電位、鈣離子流、多藥物抗性、氯離子以及氯離子通道等方面的指標(biāo)。每種檢測(cè)方案均能提供不同的檢測(cè)方案。這些高效的檢測(cè)方案為從多角度研究細(xì)胞功能活動(dòng)提供了一種十分有效的方法。腫瘤細(xì)胞對(duì)細(xì)胞毒素藥物的抗性被認(rèn)為是成功進(jìn)行*的主要障礙之一。一些腫瘤從一開(kāi)始就對(duì)細(xì)胞毒素藥物無(wú)任何反應(yīng),另一些腫瘤細(xì)胞一開(kāi)始會(huì)被細(xì)胞毒素藥物抑制,但腫瘤細(xì)胞再次生長(zhǎng),并且具有細(xì)胞毒素藥物抗性。這種現(xiàn)象可能是由給予的抗癌藥物誘導(dǎo)的基因突變所造成,或者它們可能是在惡性腫瘤細(xì)胞中本身就存在一類代表性抗性細(xì)胞。多藥物抗性(MDR)是導(dǎo)致多種*方式失敗的主要原因。在過(guò)去的幾年中發(fā)現(xiàn),腫瘤細(xì)胞的*抗性與至少兩種ATP依賴性藥物流出泵基因的過(guò)表達(dá)相關(guān),這一觀點(diǎn)逐漸廣泛地被人們所接受。這些細(xì)胞膜蛋白,被稱為P-糖蛋白(Pgp, MDR1)和多藥物抗性關(guān)聯(lián)蛋白(MRP1),它們都是ABC轉(zhuǎn)運(yùn)蛋白家族成員。
產(chǎn)品性能:
Screen Quest多藥物抗性MDR熒光法檢測(cè)試劑盒用一種MDR熒光指示劑來(lái)檢測(cè)這兩種MDR泵的活性。這種疏水性熒光染料分子快速地穿透細(xì)胞膜,并且在細(xì)胞中被捕獲。經(jīng)過(guò)短暫的孵育,細(xì)胞中游離的染料濃度會(huì)明顯地增加。在MDR1和/或表達(dá)MRP1的細(xì)胞中,這種染料被MDR轉(zhuǎn)運(yùn)蛋白轉(zhuǎn)運(yùn)出來(lái),因此細(xì)胞熒光強(qiáng)度下降。然而,當(dāng)其轉(zhuǎn)運(yùn)位點(diǎn)被一種干擾了MDR1和/或MRP1泵活性的試劑封閉,細(xì)胞熒光強(qiáng)度會(huì)顯著地增強(qiáng)。MDR檢測(cè)試劑盒提供所有檢測(cè)必需組分,并帶有一種*檢測(cè)方法。
產(chǎn)品應(yīng)用領(lǐng)域:
本檢測(cè)法可以便捷地用于96或者384微孔板分析中,且易于實(shí)現(xiàn)自動(dòng)化。本檢測(cè)試劑盒是高通量篩選MDR泵抑制劑或者鑒定細(xì)胞是否具有高活性MDR泵的理想試劑盒。
產(chǎn)品英文注釋:
Tumor cell resistance to cytotoxic drugs is considered one of the major obstacles to successful chemotherapy. Some tumors are initially resistant and never respond to cytostatic drug treatment; others initially respond well but eventually regrow and become resistant. This phenomenon may result from genetic mutations induced by the administered antitumor agent, or may represent the selection of preexisting resistant cell populations in the malignant tumor. Multi-drug resistance (MDR) is a major factor in the failure of many forms of chemotherapy. In the past few years it has become widely accepted that the resistance to chemotherapy correlates with the overexpression of at least two ATP-dependent drug-efflux pumps. These cell membrane proteins, called P-glycoprotein (Pgp, MDR1), and multidrug-resistance-associated protein (MRP1) are members of the ABC transporter family. Our assay kit uses a fluorescent MDR indicator for assaying these two MDR pump activities. This hydrophobic fluorescent dye molecule rapidly penetrates cell membranes and becomes trapped in cells. Following a short incubation, the intracellular free dye concentration can increase significantly. In the MDR1 and/or MRP1-expressing cells this dye is extruded by the MDR transporter, thus decreasing the cellular fluorescence intensity. However, when its extrusion is blocked by an agent that interferes with the MDR1 and/or MRP1 pump-activity, its cellular fluorescence intensity increases significantly. Our MDR assay kit provides all the essential components with an optimized assay method. The assay can be performed in a convenient 96-well or 384-well microtiter-plate format and easily adapted to automation. This assay kit is ideal for high throughput screening of MDR pump inhibitors or identifying the cells that have high level of MDR pump activities.
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