The FLIPR assay is a simple, flexible, and cost-effective method to determine ion channel permeability. The FLIPR(TM) assay is a cell-based test for calcium, potassium, and sodium channels. To determine the optimal cell seeding density, start by seeding the entire assay plate at a single density. In the second edition, seed cells with the maximal concentration of agonist. A series of two additions is recommended to minimize the edge effect and obtain the highest signal.
The FLIPR Assay Test Use
Using the FLIPR assay testing is easy and simple. The platform is equipped with a two-position filter slide. Filter #1 is typically a 488-nm filter for calcium assays. The second filter is blank or 535 nm for membrane potential assays. Depending on the desired output file, the FLIPR can be integrated with various laboratory robotic systems. A variety of specialized accessories are available.
Determining Ion Channels
To determine the ion channel permeability, we first established human MrgD-expressing cell lines and examined their MrgD-RNA expression levels. The cell lines displayed a wide expression range of MrgD RNA. From this list, eleven clones with broad-range expression were chosen for FLIPR studies. We used CHO-DUKX as the parental cell line.
The results of FLIPR assays demonstrated that MrgD RNA expression levels were inversely related to beta-alanine-induced calcium transient functional responses.
During the FLIPR assay, the KCC2-driven FLIPR signal displays a rapid linear increased phase within the first 10 s after Tl+ addition. Thereafter, the signal reaches a plateau. The kinetic measurements of transporter activity are like those for enzymes. The initial linear phase of signal increase allows you to calculate the initial rate of Tl+ transport by KCC2 compared with mock-transfected cells.
How It Has Changed
The FLIPR System has evolved over the last 15 years to become a highly accurate and versatile screening platform for ion channels and GPCRs. The latest addition to the FLIPR product line is the FLIPR Tetra System, which has been optimized for luminescent assays. Molecular Devices also offers a comprehensive line of FLIPR assay kits. Molecular Devices FLIPR Assay kits are designed to measure the calcium ion flux in cells and other biological systems.
Dual-Addition Assay
Using the dual-addition assay, it is possible to detect agonists and antagonists from the same screen. Moreover, the compounds identified using this technique may serve as positive controls in further screening efforts. High-potency drug-like compounds usually require extensive medicinal chemistry efforts. Ultimately, these compounds provide valuable insights into the design of new drugs. They are useful positive controls for drug discovery efforts. There are many other drugs that can be used for the dual-addition assay.
Final Words
The FLIPR Assay is an evolved method in research which can provide us with accurate cell testing results. This testing method can also be used to test new drugs which is an advancement in medical research, ensuring that medicines are being thoroughly tested and researched before distributed and consumed.
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