58. Which of the following is produced commercially by mammalian cell culture?
1. Insulin
2. Tissue plasminogen activator
3. Rennin
4. Shikonin

What Is Produced Commercially by Mammalian Cell Culture?

Mammalian cell culture plays a crucial role in biotechnology, enabling the production of various biopharmaceuticals and therapeutic proteins. Some essential products derived from mammalian cell cultures include monoclonal antibodies, vaccines, and recombinant proteins. But among the given options, let’s identify which one is commercially produced by mammalian cell culture.

Answer: Tissue Plasminogen Activator (tPA)

Among the given options:

1. Insulin – Produced mainly using recombinant DNA technology in E. coli or yeast, not mammalian cells.
2. Tissue Plasminogen Activator (tPA) – A clot-dissolving enzyme produced using mammalian cell culture.
3. Rennin (Chymosin) – Used in cheese-making and primarily produced using microbial fermentation, not mammalian cells.
4. Shikonin – A plant-derived compound, not produced via mammalian cell culture.

Thus, tissue plasminogen activator (tPA) is the correct answer.

Why Is tPA Produced in Mammalian Cells?

Tissue plasminogen activator is used for dissolving blood clots in stroke and heart attack patients. It requires complex post-translational modifications, such as glycosylation, which can only be performed by mammalian cells (e.g., CHO cells). These modifications are crucial for its stability and function.

Other Biopharmaceuticals Produced Using Mammalian Cell Culture

Mammalian cell culture is widely used for producing:

1. Monoclonal Antibodies (mAbs)

• Used in cancer therapy, autoimmune diseases, and infectious diseases.
• Examples: Rituximab, Trastuzumab (Herceptin), Bevacizumab.

2. Recombinant Proteins

• Includes erythropoietin (EPO) for anemia and coagulation factors for hemophilia treatment.

3. Vaccines

• Many viral vaccines, such as the rabies and polio vaccines, are produced in mammalian cell lines like Vero and MDCK.

4. Enzymes for Therapeutic Use

• Example: Iduronidase for lysosomal storage diseases.

Advantages of Using Mammalian Cell Culture

• Post-translational modifications: Essential for protein folding and function.
• Human-like proteins: Higher bioactivity and lower immunogenicity.
• Scalability: Advanced bioreactors allow large-scale production.

Conclusion

Mammalian cell culture is a cornerstone of modern biopharmaceutical production. While insulin and rennin are produced using microbial systems, tissue plasminogen activator (tPA) is exclusively produced using mammalian cell culture due to its complex glycosylation requirements. The field continues to evolve, offering new solutions for medical and industrial biotechnology.