Single cell auto patch

G - Physics – 01 – N

Patent

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Details

G01N 33/487 (2006.01) C12M 1/34 (2006.01) C12M 3/00 (2006.01)

Patent

CA 2411845

The invention provides a method for obtaining a patch clamp recording from a cell, which includes the steps of providing a microchannel capable of an axial flow of a liquid, providing in the microchannel at least one access port to allow radial access from the exterior of the microchannel (air) to the interior of the microchannel (liquid); whereby liquid in the microchannel forms a meniscus at the port and produces an air/liquid interface, providing a patch-clamp pipette having a tip suitable for passing into the access port suitable for forming a high-resistance (giga-ohm) electrical seal between the tip and the cell, passing liquid carrying the cell axially along the microchannel, causing the cell to be carried to the access port, moving the patch-clamp pipette tip and the microchannel relative to each other radially to bring the tip into contact with the air/liquid interface in the access port, applying suction to the patch-clamp to draw the cell onto the tip to form the seal, and making a patch-clamp recording. The invention also provides an apparatus for carrying out the method.

La présente invention concerne un procédé permettant de réaliser à partir d'une seule cellule un enregistrement selon la technique patch-clamp. On commence par établir un micro-canal admettant un écoulement axial du liquide. Dans ce micro-canal, on ménage au moins un orifice permettant un accès radial depuis l'extérieur du micro-canal (air) vers l'intérieur du micro-canal (liquide), le liquide formant à l'intérieur du micro-canal au niveau de l'orifice un ménisque constituant une interface air-liquide. Avec une pipette pour procédé patch-clamp dont la pointe, capable de passer dans l'orifice d'accès, permet de former entre la pointe et la cellule une fermeture électrique à haute résistance, c'est-à-dire giga-ohmique, on laisse passer axialement dans la longueur du micro-canal le liquide portant la cellule, ce qui amène la cellule jusqu'à l'orifice d'accès. Après avoir déplacé la pointe de pipette radialement par rapport au micro-canal jusqu'à toucher l'interface air-liquide dans l'orifice d'accès, on applique au patch-clamp une force d'aspiration de façon à attirer sur la pointe la cellule pour former une fermeture. Il ne reste plus qu'à réaliser l'enregistrement en patch-clamp. L'invention concerne également un appareil pour mettre en oeuvre ce procédé.

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