Use of photodynamic therapy therapeutic agents entrapped in...

A - Human Necessities – 61 – K

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A61K 9/14 (2006.01)

Patent

CA 2513759

The present invention provides methods and compositions for photodynamic therapy. The composition comprises ceramic nanoparticles in which a photosensitive drug/dye is entrapped. The ceramic nanoparticles are made by formation of a micellar composition of the dye. The ceramic material is added to the micellar composition and the ceramic nanoparticles are precipitated by alkaline hydrolysis. The precipitated nanoparticles in which the photosensitive dye/drug is entrapped can be isolated by dialysis. The resulting drug doped nanoparticles are spherical, highly monodispersed, and stable in aqueous system. Irradiation with light of suitable wavelength of the photosensitizing drug entrapped inside nanoparticles resulted in generation of singlet oxygen, which was able to diffuse out through the pores of the ceramic matrix. The drug loaded ceramic nanoparticles of the present invention can be used as drug carriers for photodynamic therapy.

La présente invention concerne des procédés et des compositions destinés à être utilisés en thérapie photodynamique. Cette composition comprend des nanoparticules à base de céramique dans lesquelles est emprisonné un médicament/colorant photosensible. Ces nanoparticules à base de céramique sont obtenues par formation d'une composition micellaire du colorant. La matière céramique est ajoutée à la composition micellaire et les nanoparticules à base de céramique sont précipitées par hydrolyse alcaline. Les nanoparticules précipitées dans lesquelles est emprisonné le médicament/colorant photosensible peuvent être isolées par dialyse. Les nanoparticules dopées au médicament résultantes sont sphériques, hautement monodispersées et stables dans un système aqueux. Lorsque l'on soumet le médicament photosensible emprisonné dans les nanoparticules à un rayonnement de lumière de longueur d'onde adaptée, on obtient de l'oxygène singulet capable de se diffuser par les pores de la matrice céramique. Les nanoparticules à base de céramique dans lesquelles est emprisonné le médicament de la présente invention peuvent être utilisées comme vecteurs de médicaments en thérapie photodynamique.

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