Glycoengineering of Mammalian Expression Systems on a Cellular Level.

Area of Science:

• Biotechnology and Bioprocessing
• Glycoscience
• Mammalian Cell Culture

Background:

• Mammalian expression systems, including Chinese hamster ovary (CHO) cells, are vital for producing recombinant protein therapeutics.
• Glycoproteins, a major class of biologics, possess complex glycan structures critical for product quality and function.
• N-linked glycosylation is a key focus for engineering, as its modulation impacts therapeutic properties like half-life and efficacy.

Purpose of the Study:

• To provide an overview of glycosylation, sialylation, and fucosylation networks in mammalian cells, particularly CHO cells.
• To describe genetic engineering technologies for modulating glycosylation pathways in CHO cells.
• To explore new strategies and future directions in CHO cell glycoengineering.

Main Methods:

• Overview of glycosylation, sialylation, and fucosylation networks in CHO cells.
• Description of genetic engineering techniques to modulate glycosylation pathways.
• Examples of CHO cell engineering, including overexpression of glycosyltransferases and sialyltransferases, and reduction of sialidase cleavage and fucosylation.

Main Results:

• Genetic engineering approaches can effectively modulate N-glycan composition in CHO cells.
• Specific modifications, such as altering sialylation and fucosylation, can impact product quality attributes.
• The chapter details successful strategies for glycoengineering CHO cells.

Conclusions:

• CHO cell glycoengineering offers significant potential for optimizing recombinant protein therapeutics.
• Integration of glycomics, glycoproteomics, and 'omics' approaches will drive future advancements.
• Targeted modulation of glycosylation pathways is crucial for enhancing therapeutic efficacy and quality.