Neutral amino acid transporter and gene thereof

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/12 (2006.01) A01K 67/00 (2006.01) A61K 31/70 (2006.01) A61K 39/395 (2006.01) A61K 48/00 (2006.01) C07K 14/47 (2006.01) C07K 14/705 (2006.01) C07K 16/18 (2006.01) C12N 5/10 (2006.01) C12Q 1/02 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2341777

A novel amino acid transporter molecule mediating transportation of amino acids, which are nutrients essentially required in the survival and proliferation of various normal cells constituting a living body and various pathology-associated abnormal cells such as tumor cells, into cells and being expressed specifically in tumor cells compared with normal cells; and drugs for treating various pathogenic conditions such as tumor (cancer) which are obtained by identifying and isolating the above amino acid transporter molecule and identifying a substance capable of inhibiting the biological activity and/or expression of this molecule. Intensive studies were made to identify a tumor cell membrane surface molecule conjugating or interacting with a cell membrane surface 4F2 molecule seemingly playing an important role in the activation of an unknown amino acid transporter. As a result, a gene encoding the novel amino acid transporter molecule, which mediates the incorporation of various neutral amino acids, various drugs or physiological substances into cells, has been found out and a substance capable of inhibiting the incorporation of amino acids via this molecule and thus inhibiting the proliferation of tumor cells has been also found out.

L'invention concerne une nouvelle molécule tenant lieu de transporteur d'acides aminés, qui assure la médiation du transport des acides aminés, ces acides étant des éléments nutritifs essentiels pour la survie et la prolifération de différentes cellules normales constitutives d'un organisme vivant et de différentes cellules anormales associées à une pathologie, comme les cellules tumorales. Le transport s'effectue vers les cellules, et les acides aminés sont exprimés spécifiquement dans les cellules tumorales par rapport aux cellules normales. L'invention concerne en outre des médicaments qui permettent de traiter divers états pathogènes (par exemple, tumeur cancéreuse), ces médicaments étant obtenus par identification et isolation de la molécule susmentionnée, et par identification d'une substance permettant d'inhiber l'activité biologique et/ou l'expression de ladite molécule. Des études intensives ont été conduites pour identifier une molécule de surface membranaire de cellule tumorale se conjuguant ou interagissant avec une molécule 4F2 de surface membranaire de cellule semblant jouer un rôle important dans l'activation d'un transporteur d'acide aminé inconnu. En conséquence, on a pu identifier un gène codant la nouvelle molécule considérée, qui assure la médiation du transport de divers acides aminés neutres, de différents médicaments ou autres substances physiologiques dans les cellules, et on également identifié une substance capable d'inhiber le transport d'acides aminés via ladite molécule, ce qui permet d'inhiber la prolifération des cellules tumorales.

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