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Quantitative proteomic analysis of MDCK cell adhesion
Xuanqing Ye1, Jiamin Wang, Zilin Qiao
1Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China. liuzhenbin6@163.com.
Abstract:
MDCK cells are a key reagent in modern vaccine production. As MDCK cells are normally adherent, creation of suspension cells for vaccine production using genetic engineering approaches is highly desirable. However, little is known regarding the mechanisms and effectors underlying MDCK cell adhesion. In this study, we performed a comparative analysis of whole protein levels between MDCK adhesion and suspension cells using an iTRAQ-based (isobaric tags for relative and absolute quantitation) proteomics approach. We found that expression of several proteins involved in cell adhesion exhibit reduced expression in suspension cells, including at the mRNA level. Proteins whose expression was reduced in suspension cells include cadherin 1 (CDH1), catenin beta-1 (CTNNB1), and catenin alpha-1 (CTNNA1), which are involved in intercellular adhesion; junction plakoglobin (JUP), desmoplakin (DSP), and desmoglein 3 (DSG3), which are desmosome components; and transglutaminase 2 (TGM2) and alpha-actinin-1 (ACTN1), which regulate the adhesion between cells and the extracellular matrix. A functional verification experiment showed that inhibition of E-cadherin significantly reduced intercellular adhesion of MDCK cells. E-Cadherin did not significantly affect the proliferation of MDCK cells and the replication of influenza virus. These findings reveal possible mechanisms underlying adhesion of MDCK cells and will guide the creation of MDCK suspension cells by genetic engineering.
Insights
Researchers identified key proteins like E-cadherin that regulate MDCK cell adhesion. Understanding these adhesion mechanisms is crucial for developing genetically engineered MDCK suspension cells for vaccine production.
Area of Science:
- Biotechnology
- Cell Biology
- Proteomics
Background:
- Madin-Darby Canine Kidney (MDCK) cells are vital for vaccine production but are typically adherent.
- Developing MDCK suspension cells via genetic engineering is highly desirable for efficient vaccine manufacturing.
- Mechanisms governing MDCK cell adhesion are not well understood.
Purpose of the Study:
- To comparatively analyze protein expression between adherent and suspension MDCK cells.
- To identify key proteins and pathways involved in MDCK cell adhesion.
- To provide insights for engineering MDCK suspension cell lines.
Main Methods:
- Utilized isobaric tags for relative and absolute quantitation (iTRAQ) proteomics.
- Compared whole protein levels between MDCK adhesion and suspension cell lines.
- Performed functional verification experiments, including E-cadherin inhibition.
Main Results:
- Identified reduced expression of cell adhesion proteins (e.g., cadherin 1, catenins, desmosome components) in suspension MDCK cells at both protein and mRNA levels.
- E-cadherin, a key intercellular adhesion molecule, showed reduced expression in suspension cells.
- E-cadherin inhibition significantly decreased MDCK cell adhesion but did not impact cell proliferation or influenza virus replication.
Conclusions:
- Reduced expression of specific cell adhesion molecules underlies the transition to MDCK suspension cells.
- E-cadherin plays a significant role in MDCK cell-to-cell adhesion.
- These findings offer a foundation for genetically engineering MDCK suspension cells for enhanced vaccine production.
