A recombinant method for production of an erythropoiesis...

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 14/505 (2006.01)

Patent

CA 2609473

The present invention relates to the recombinant method used for the production of a highly glycosylated form (in total five N linked glycosylations as opposed to three N linked glyosylations in the natural EPO) of erythropoietin. The added sites for glycosylation will result in greater number of carbohydrate chains, and higher sialic acid content than human EPO, which in turn would impart to the recombinant molecule a longer half-life. The invention further relates to the construction of expression cassettes comprising nucleic acid sequences encoding for the highly glycosylated form of Erythropoietin and stable expression in the host cells. The invention further relates to the optimized method for purification of the erythropoiesis stimulating protein. The recombinant EPO according to the invention, and the salts and functional derivatives thereof, may comprise the active ingredient of pharmaceutical compositions for an increase in the hematocrit for treatment of anemia and for restoration of patient well being and quality of life.

La présente invention concerne une méthode recombinante utilisée pour la production d'une forme hautement glycosylée (au total cinq glycosylations liées à N opposées à trois glycosylations liées à N dans l'EPO naturelle) d'érythropoïétine. Les sites ajoutés pour la glycosylation débouchent sur un nombre supérieur de chaînes de glucide, et un contenu d'acide sialique plus élevé que l'EPO humaine qui, à son tour, confère à la molécule recombinante une demi-vie plus longue. Cette invention a aussi trait à la construction de cassettes d'expression contenant des séquences d'acides nucléiques codant la forme hautement glycosylée d'érythropoïétine et l'expression stable dans les cellules hôtes. Cette invention a, également, pour objet la méthode optimisée destinée à la purification de la protéine de stimulation d'érythropoïése. L'EPO recombinante de ladite invention et les sels et les dérivés fonctionnels associés peuvent comprendre l'ingrédient actif de compositions pharmaceutiques pour augmenter l'hématocrite dans le traitement de l'anémie et dans la restauration du bien-être et de la qualité de vie d'un patient.

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