Method for expressing sialylated glycoproteins in mammalian...

A - Human Necessities – 61 – K

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A61K 48/00 (2006.01) A61P 43/00 (2006.01)

Patent

CA 2565410

Methods and systems for producing glycoproteins having sialylated oligosaccharides are provided. The invention comprises the genetic engineered cells with a CMP-sialic acid transporter (CMP-SAT) gene so that the cells express the CMP-SAT protein or fragment thereof at an above endogenous levels. The increase in CMP-SAT expression allows for the increased transport of the CMP-sialic acid into the Golgi apparatus so as to obtain sialylation of glycoproteins at above endogenous levels. In particular, the methods and systems of the invention are useful for producing complex sialylated glycoproteins in mammalian cells of interest, for example Chinese Hamster Ovary (CHO) cells.

L'invention concerne des méthodes et des systèmes de production de glycoprotéines comprenant des oligosaccharides sialylés. L'invention concerne des cellules mises au point par génie génétique avec un gène transporteur CMP-acide sialique (CMP-SAT) permettant aux cellules d'exprimer la protéine CMP-SAT ou un fragment de celle-ci à un niveau supérieur au niveau endogène. L'augmentation de l'expression de CMP-SAT permet une augmentation du transport de CMP-acide sialique dans l'appareil Golgi de façon à obtenir la sialylation des glycoprotéines à des niveaux supérieurs au niveau endogène. Les méthodes et systèmes de l'invention sont utilisés, en particulier, dans la production de glycoprotéines complexes sialylées dans des cellules mammifères d'intérêt, par exemple les cellules ovariennes du hamster chinois (CHO).

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