Influence of cytoskeleton organization on recombinant protein expression by CHO cells

Area of Science:

• Biotechnology
• Cell Biology
• Bioprocessing

Background:

• Mammalian cell lines, such as Chinese hamster ovary (CHO) cells, are crucial for producing therapeutic proteins.
• Cytoskeleton organization plays a vital role in cellular functions, including protein production and secretion.
• Optimizing cellular metabolism and protein production pathways is essential for efficient biomanufacturing.

Purpose of the Study:

• To investigate the role of cytoskeleton organization in enhancing therapeutic protein production in CHO cells.
• To identify specific cytoskeletal genes and proteins that influence recombinant protein yield and quality.
• To explore the metabolic implications of altered cytoskeleton organization in high-producing CHO cells.

Main Methods:

• Selection of highly productive CHO cells through vitamin B5 deprivation.
• Gene expression analysis to identify upregulated cytoskeletal genes (ACTC1 and TAGAP).
• Overexpression of ACTC1 and assessment of its impact on protein production, lactate levels, and actin polymerization.

Main Results:

• Upregulation of Actin alpha cardiac muscle 1 (ACTC1) and TAGAP in highly productive CHO cells.
• ACTC1 overexpression significantly increased recombinant therapeutic protein production.
• ACTC1 overexpression decreased toxic lactate by-products and altered polymerized actin levels.
• Reduced polymerized actin correlated with high protein production in suspension-cultured CHO cells.

Conclusions:

• ACTC1 is a key factor in improving recombinant therapeutic protein production in CHO cells.
• Altered actin dynamics, potentially through depolymerization, may enhance protein secretion.
• Modulation of integrin signaling and basal metabolism are potential mechanisms driving increased protein secretion.