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03-3 Mammalian Cells
Today, 60–70% of all recombinant protein pharmaceuticals and 95% of the currently approved
therapeutic antibodies are still produced in mammalian cell lines despite relatively high production
costs and difficulty in handling. The main reasons for this are the sophisticated folding and secretion
machinery as well as the ability to perform post-translational modifications that are not
distinguishable from the ones in the human body. However, the risks of contamination by pathogens
or bovine spongiform encephalopathy (TSE/BSE) agents have been eliminated by well-documented
Good Manufacturing Practice (GMP) compliant designer cell substrates and chemical defined media
without the need of supplementing animal serum components.
Production yields of recombinant mammalian cell lines quite drastically increased during the past 2
decades (Figure. 3). Over 100-fold improvement in volumetric productivity is due to increased cell
densities in modern cell culture processes, but part of it also to improved cell lines with about tenfold
higher cell specific productivities.
Chinese hamster ovary (CHO) cells are the most common cells applied in the commercial
production of biopharmaceuticals. This cell line isolated in the 1950s. Today different genetic
progenies have been developed, for example, K1, DukX B11, or DG44 that differ in product quality
and yield. Besides this, murine myeloma (NS0, SP2/0), BHK (baby hamster kidney), and HEK293
(human embryonic kidney) are also used to a lesser extent. Although glycosylation patterns of
mammalian glycoproteins are very similar to that in humans, even small differences can influence
pharmacokinetics and effector functions of antibodies. Alternative designer cell lines with improved
glycosylation patterns have been generated.

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mRNA Encoded Antibodies

  • 1. 03-3 Mammalian Cells Today, 60–70% of all recombinant protein pharmaceuticals and 95% of the currently approved therapeutic antibodies are still produced in mammalian cell lines despite relatively high production costs and difficulty in handling. The main reasons for this are the sophisticated folding and secretion machinery as well as the ability to perform post-translational modifications that are not distinguishable from the ones in the human body. However, the risks of contamination by pathogens or bovine spongiform encephalopathy (TSE/BSE) agents have been eliminated by well-documented Good Manufacturing Practice (GMP) compliant designer cell substrates and chemical defined media without the need of supplementing animal serum components. Production yields of recombinant mammalian cell lines quite drastically increased during the past 2 decades (Figure. 3). Over 100-fold improvement in volumetric productivity is due to increased cell densities in modern cell culture processes, but part of it also to improved cell lines with about tenfold higher cell specific productivities. Chinese hamster ovary (CHO) cells are the most common cells applied in the commercial production of biopharmaceuticals. This cell line isolated in the 1950s. Today different genetic progenies have been developed, for example, K1, DukX B11, or DG44 that differ in product quality and yield. Besides this, murine myeloma (NS0, SP2/0), BHK (baby hamster kidney), and HEK293 (human embryonic kidney) are also used to a lesser extent. Although glycosylation patterns of mammalian glycoproteins are very similar to that in humans, even small differences can influence pharmacokinetics and effector functions of antibodies. Alternative designer cell lines with improved glycosylation patterns have been generated.