Methods and device for in vitro detection and...

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G01N 33/483 (2006.01) C12M 1/34 (2006.01) G01N 33/487 (2006.01) G01N 33/50 (2006.01)

Patent

CA 2375550

This relates to methods for the detection of psychoactive compounds in an in vitro neuronal tissue sample by detecting oscillations of extracellular voltage desirably before and after the introduction of a candidate sample onto an in vitro neuronal tissue sample and for devices useful in practicing the methods. Analysis of the extracellular voltage parameters leads to indication of the presence of psychoactive material in the candidate sample and information as to its pharmacological activity and/or composition. Further, it relates to a process of initiating and maintaining the presence of repetitive neuronal activity within the in vitro sample. Additionally, this includes a method for the stimulation of or initiation of repetitive neuronal activity, e.g., EEG, in an in vitro nueronal tissue sample by introducing a stimulating composition comprising compounds that facilitate or mimic the actions of acetylcholine, serotonin, or catecholamines, such as carbachol, or by subjecting the in vitro neuronal sample to electrical stimulation parameters.

L'invention concerne des procédés de détection de composés psychotropes dans un échantillon in vitro de tissu neuronal, par détection des oscillations de la tension extracellulaire, de préférence avant et après l'introduction d'un échantillon candidat sur l'échantillon in vitro de tissu neuronal; elle concerne également des dispositifs utiles dans la mise en pratique de ces procédés. L'analyse des paramètres de la tension extracellulaire fournit une indication de la présence d'une substance psychotrope dans l'échantillon candidat, de même que des informations relatives à l'activité pharmacologique et/ou à la composition de cet échantillon. En outre, l'invention concerne encore un procédé consistant à démarrer une activité neuronale répétitive et à conserver celle-ci dans l'échantillon in vitro, ce qui implique en outre une technique de stimulation ou de démarrage de l'activité neuronale répétitive, par exemple des ondes électroencéphalographiques (EEG), dans un échantillon tissulaire neuronal in vitro, par introduction d'une composition de stimulation comprenant des composés facilitant ou imitant les actions de l'acétylcholine, de la sérotonine ou des catécholamines, telle que le carbachol, ou par soumission de l'échantillon neuronal in vitro à des paramètres de stimulation électrique.

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