Non-polar photosensitizer formulations for photodynamic therapy

A - Human Necessities – 61 – K

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A61K 9/127 (2006.01) A61K 31/409 (2006.01) A61K 41/00 (2006.01)

Patent

CA 2536977

A pharmaceutical liposomal formulation for photodynamic therapy comprising a non-polar porphyrin photosensitizer and one or more phospholipids, which are stable in storage without requiring freeze-drying is described. The liposomal formulation provides therapeutically effective amounts of the photosensitizer for intravenous administration. The phospholipids may be modified by pegylation, i.e. they contain poly ethylene glycol as an integral part of the phospholipids. The formed liposomes contain the non-polar photosensitizer within the membrane and are useful for the combined targeting of a nonpolar photosensitizer and a second polar substance. When a formulation includes the presence of monosaccharides or polyalcohols, it can be efficiently freeze- dried preserving the size of the liposomal vehicles and the content of a therapeutically effective amount of the photosensitizing agent. The invention also relates to the liposome composition formed upon reconstitution with an aqueous vehicle. The freeze-dried formulation upon reconstitution with a suitable aqueous vehicle forms liposomes that are also useful for intravenous administration.

L'invention concerne une formulation pharmaceutique liposomique destinée à la thérapie photodynamique et comprenant un agent photosensibilisant de porphyrine non polaire et un ou plusieurs phospholipides stables au stockage et ne nécessitant pas de lyophilisation. Cette formulation liposomique contient des quantités thérapeutiquement suffisantes de l'agent photosensibilisant pour l'administration par intraveineuse. Les phospholipides peuvent être modifiés par pegylation, c'est-à-dire qu'ils contiennent du polyéthylène glycol comme partie intégrante de leur composition. Les liposomes formés contiennent l'agent photosensibilisant non polaire à l'intérieur de la membrane et ils servent pour le ciblage combiné d'un agent photosensibilisant non polaire et d'une substance polaire. Lorsqu'une formulation comporte des monosaccharides ou des polyalcools, elle peut être lyophilisée pour conserver la taille des véhicules liposomiques et le contenu d'une quantité efficace de l'agent photosensibilisant. La présente invention porte également sur la composition du liposome formé par reconstitution avec un véhicule aqueux. La formulation lyophilisée après reconstitution avec un véhicule aqueux adapté donne des liposomes également utiles pour l'administration par intraveineuse.

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