Amgen Inc.

Immunex Corporation

Brian D Follstad

Arvia Eleanor Morris

Rebecca E McCoy

Anne H Potter

Rebecca E Mccoy

The invention provides a method for culturing mammalian cells. The method provides greater control over cell o growth to achieve high product titer cell cultures.

Mammalian cell culture

The invention provides a method for culturing mammalian cells. The method provides greater control over cell growth to achieve high product titer cell cultures.

The invention provides a method for culturing mammalian cells. The method provides greater control over cell growth to achieve high product titer cell cultures by changing the temperature of the cell culture and/or by starving the cells in their asparagine supply.

This invention relates generally to the field of cell culture. More particularly, the invention relates to improving viability of recombinant cell cultures and the yields of secreted polypeptides therefrom by the addition of betaine to the tissue culture medium.

Cell culture performance with betaine

The invention provides media and methods for culturing mammalian cells whereby the sialylation of a protein produced by the cells is increased. The medium can contain N-acetylmannosamine and, optionally, galactose. The medium may also comprise fructose and mannose. Alternatively, the medium can contain galactose and fructose and, optionally, can also comprise mannose and/or N-acetylmannosamine. The methods can be practiced along with other methods for culturing cells so as to increase the quantity or quality of a protein produced by the cells, including culturing the cells at a temperature below 37&#xb0; C.

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Seattle, WA, United States of America

Brian D Follstad