Modified animal lung surfactant and its therapeutic use

A - Human Necessities – 61 – K

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A61K 35/42 (2006.01) A61K 38/17 (2006.01) A61L 2/04 (2006.01)

Patent

CA 2221625

The present invention relates to the method of using a composition of matter that maintains the biophyscial and physiological characteristics of natural surfactant, including the rapid and spontaenous adsorption of dilute suspensions to an air-liquid interface; the generation of low surface tension (2.1 mN/m) at a surface area compression of 50 % by the pulsating bubble method of Enhorning; and the restoration of greater than 75 % of the lost volume of a surfactant deficient lung as determined by the method of Bermel. The material is produced by adding disaturated phospholipid to the extract of surface active material obtained by lavage of the air space of the lungs of animals. The material contains 90-96 % phospholipid, 0-6 % cholesterol, and 1- 3 % protein. Greater than 99 % of the protein is lung surfactant apoproteins B and C. A sterile pharmaceutical preparation of the surface active material can be used for treating diseases caused by deficiency or dysfunction of natural lung surfactant.

La présente invention se rapporte à un procédé d'utilisation d'une composition de substances qui maintient les caractéristiques biophysiques et physiologiques du tensio-actif naturel, y compris l'adsorption rapide et spontanée de suspensions diluées au niveau d'une interface air-liquide, à la génération d'une tension de surface faible (?2.1 mN/m) avec compression d'aire de surface de 50 % par le procédé à bulle de pulsation de Enhorning, ainsi qu'au rétablissement de plus de 75 % du volume perdu par un poumon déficient en tensio-actif telle que déterminée par la méthode Bermel. On produit la substance en ajoutant des phospholipides disaturés à l'extrait d'une subtance tensio-active obtenue en lavant l'espace aérien des poumons d'un animal. La substance contient entre 90 et 96 % de phospholipides et entre 1 et 3 % de protéine. Les apoprotéines de tensio-actif de poumons B et C constituent plus de 99 % de la protéine. Une préparation pharmaceutique stérile de la substance tensio-active peut être utilisée pour traiter des maladies dues à un déficit en tensio-actif naturel du poumon ou au dysfonctionnement de ce dernier.

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