Use of liposomes in a carrier comprising a continuous...

A - Human Necessities – 61 – K

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A61K 48/00 (2006.01) A61K 9/127 (2006.01) A61K 31/7088 (2006.01) A61K 47/44 (2006.01) C12N 15/10 (2006.01) C12N 15/88 (2006.01)

Patent

CA 2700808

Compositions comprising liposomes are frequently used to deliver nucleic acids to a mammal for exogenous expression of a therapeutic protein, suppression of the expression of a disease-causing protein, or to induce an immune response against a disease-causing pathogenic cell or a cancer cell. The liposome-nucleic acid complex of these compositions are normally suspended as a dispersed phase in a pharmaceutically-acceptable aqueous carrier that constitutes a continuous phase to form an oil-in-water emulsion. Using a continuous phase of a hydrophobic carrier, instead of an aqueous carrier, to carry the dispersed phase of liposomes encapsulating nucleic acids, a composition is produced that is more effective in delivering nucleic acids to a mammalian subject in addition to being encapsulated in the liposomes, the nucleic acids may also be present in the hydrophobic carrier as a water-in-oil emulsion.

Il est fréquemment utilisé des compositions comprenant des liposomes pour délivrer des acides nucléiques à un mammifère pour l'expression exogène d'une protéine thérapeutique, la suppression de l'expression d'une protéine responsable d'une maladie ou pour l'induction d'une réponse immunitaire contre une cellule pathogène responsable d'une maladie ou une cellule cancéreuse. Les complexes liposome-acide nucléique de ces compositions sont normalement en suspension sous la forme d'une phase dispersée dans un véhicule aqueux acceptable sur le plan pharmaceutique qui constitue une phase continue pour former une émulsion huile dans l'eau. En utilisant une phase continue de véhicule hydrophobe, à la place d'un véhicule aqueux, afin de porter la phase dispersée des liposomes encapsulant les acides nucléiques, la composition produite est plus efficace dans la délivrance d'acides nucléiques à un sujet mammalien. En plus d'être encapsulés dans les liposomes, les acides nucléiques peuvent être également présents dans le véhicule hydrophobe sous la forme d'une émulsion eau dans l'huile.

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