Dna molecules encoding ctenocephalides felis glutamate gated...

C - Chemistry – Metallurgy – 12 – N

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C12N 1/20 (2006.01) C07H 21/04 (2006.01) C07K 14/435 (2006.01) C07K 14/705 (2006.01) C12N 15/00 (2006.01)

Patent

CA 2299618

To date, L-glutamate-gated chloride (GluC1) channels have been observed only in invertebrate organisms. Modulators of this channel (either agonists or antagonists) will interfere with neurotransmission. For example, agents such as avermectins activate the GluCl, causing paralysis due to blocking of neurotransmitter release, resulting in death of the organism. Because GluCl channels are invertebrate specific, they are excellent targets for the discovery of novel insecticides, anthelminths and parasiticides that will display a marked safety profile because of the lack of mechanism based toxicity in vertebrate organisms. The present specification discloses isolation of a cDNA clone from the cat flea Ctenocephalides felis (CfGluCl-1) that encodes a L-glutamate-gated chloride channel. Heterologous expression of CfGluCl-1 cRNA in Xenopus oocytes results in robust expression of a L- glutamate-gated chloride current and the channel is activated and potentiated by avermectins. The expression of CfGluCl-1 in a heterologous expression system is useful to screens for novel GluCl channel agonists and antagonists. Additionally, this specification discloses improved methods of screening for GluCl channel modulators.

A ce jour, on a observé des canaux à chlorure commandés par L-glutamate (GluCl) uniquement dans des organisme invertébrés. Des modulateurs de ce canal (soit agonistes, soit antagonistes) agissent sur la neurotransmission. Par exemple, des agents tels que les avermectines, activent le GluCl, causant une paralysie due au blocage de la libération des neurotransmetteurs, entraînant la mort de l'organisme. Comme les canaux GluCl sont spécifiques aux invertébrés, ils constituent d'excellentes cibles pour la découverte de nouveaux insecticides, anthelminthes et antiparasitaires présentant un profil d'innocuité marqué du fait de l'absence de toxicité basée sur un mécanisme dans les organismes vertébrés. La présente description concerne l'isolement d'un clone d'ADNc de la puce du chat Ctenocephalides felis (CfGluCl-1) qui code un canal à chlorure commandé par L-glutamate. Une expression hétérologue de l'ARNc de CfGluCl-1 dans des ovocytes de Xenopus aboutit à une expression fiable d'un courant de chlorure commandé par L-glutamate, le canal étant activé et potentialisé par des avermectines. L'expression de CfGluCl-1 dans un système d'expression hétérologue est utile pour des criblages de nouveaux agonistes et antagonistes des canaux GluCl. En outre, cette description concerne des méthodes améliorées de criblage de modulateurs des canaux GluCl.

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