Assay methods and compositions useful for measuring receptor...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/02 (2006.01) C07K 14/705 (2006.01) C07K 14/72 (2006.01) C12N 5/10 (2006.01) C12Q 1/68 (2006.01) G01N 33/566 (2006.01) G01N 33/94 (2006.01)

Patent

CA 2293254

This invention provides a system for screening chemical compounds to identify ligands for receptors including G-protein coupled receptors. The invention exploits cells in which the receptor is coupled through a second messenger system to an ion channel that is gated by cyclic nucleotide. Receptor stimulation causes the second messenger system to produce cyclic nucleotide, which results in ion influx through the channel. By measuring ion influx fluorescently, the invention provides a rapid and convenient means for identifying receptor ligands. By providing mixed cell cultures that include cells expressing different receptor types, and by loading into those cells different fluorescent reporters of ion influx, the invention further provides a multiplexed system that accelerates the ligand identification process. Cells useful in the process, and mehtods for exploiting them, are described.

L'invention concerne un système permettant de cribler des composés chimiques afin d'identifier des ligands destinés à des récepteurs, notamment aux récepteurs liés aux protéines G. Elle utilise des cellules dans lesquelles le récepteur est couplé, par l'intermédiaire d'un second système messager, à un canal ionique déclenché par un nucléotide cyclique. Quand le récepteur est stimulé, le second système messager produit un nucléotide cyclique, ce qui provoque le passage d'un flux ionique dans le canal. L'invention, dans laquelle ledit flux est mesuré par fluorescence, constitue un moyen rapide et pratique pour identifier des ligands de récepteurs. Elle permet d'obtenir des cultures cellulaires mixtes formées de cellules qui expriment différents types de récepteurs et dans lesquelles on peut charger différents rapporteurs fluorescents du flux ionique, ainsi qu'un système multiplexé qui accélère le processus d'identification des ligands. L'invention concerne également les cellules utiles pour ledit procédé, ainsi que les méthodes permettant de les utiliser.

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