Immunosuppression compound and treatment method

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/113 (2010.01) A61K 31/712 (2006.01) A61P 3/00 (2006.01) A61P 37/00 (2006.01) A61P 37/06 (2006.01) C07H 21/00 (2006.01)

Patent

CA 2742281

A method and compound for suppressing an immune response in a mammalian subject, for the treatment or pre-vention of an autoimmune condition or transplantation rejection are disclosed. The compound is an antisense oligonucleotide ana-log compound having a targeting sequence complementary to a preprocessed CTLA 4 mRNA region identified by SEQ ID NO: 22 in SEQ ID NO: 1, spanning the splice junction between intron 1 and exon 2 of the preprocessed mRNA of the subject. The com-pound is effective, when administered to a subject, to form within host cells, a heteroduplex structure (i) composed of the prepro-cessed CTLA 4 mRNA and the oligonucleotide compound, (ii) characterized by a Tm of dissociation of at least 45°C, and (iii) re-sulting in an increased ratio of processed mRNA encoding ligand independent CTLA 4 to processed mRNA encoding full length CTLA 4.

Cette invention concerne une méthode et un composé permettant de supprimer une réponse immunitaire chez un mammifère en vue de traiter ou prévenir une maladie auto-immune ou le rejet dun greffon. Le composé est un composé analogue dun oligonucléotide anti-sens ayant une séquence de ciblage complémentaire dune région de lARNm prétraité du CTLA-4 identifiée par la séquence SEQ ID NO: 22 de la séquence SEQ ID NO: 1, couvrant la jonction dépissage entre lintron 1 et lexon 2 de lARNm prétraité du sujet. Une fois administré chez le sujet, le composé forme avec efficacité à lintérieur des cellules hôtes une structure hétéroduplexe (i) constituée de lARNm prétraité du CTLA-4 et du composé oligonucléotidique, (ii) caractérisée par une Tm de dissociation dau moins 45 °C, et (iii) donnant lieu à un accroissement du rapport ARNm prétraité codant un CTLA-4 indépendant du ligand sur ARNm traité codant un CTLA-4 pleine longueur.

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