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Updated: Feb 1, 2026
Isolation and Enrichment of Human Lung Epithelial Progenitor Cells for Organoid Culture
Published on: July 21, 2020
Serum-reduced media impacts on cell viability and protein expression in human lung epithelial cells
Mahamud-Ur Rashid1,2, Kevin M Coombs1,2,3
1Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada.
Abstract:
Serum starvation is a widely used condition in molecular biology experiments. Opti-MEM is a serum-reduced media used during transfection of genetic molecules into mammalian cells. However, the impact of such media on cell viability and protein synthesis is unknown. A549 human lung epithelial cell viability and morphology were adversely affected by growing in Opti-MEM. The cellular protein levels of chloride intracellular channel protein 1, proteasome subunit alpha Type 2, and heat shock 70 kDa protein 5 were dysregulated in A549 cells after growing in serum-reduced media. Small interfering RNA transfection was done in Dulbecco's modified Eagle's medium (DMEM) with 10% fetal bovine serum, and knockdown efficacy was determined compared with Opti-MEM. Similar amounts of knockdown of the target proteins were achieved in DMEM, and cell viability was higher compared with Opti-MEM after transfection. Careful consideration of the impact of Opti-MEM media during the culture or transfection is important for experimental design and results interpretation.
Insights
Opti-MEM, a serum-reduced medium, negatively impacts A549 cell viability and protein levels during molecular biology experiments. Standard Dulbecco
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Serum starvation is common in molecular biology.
- Opti-MEM is a serum-reduced medium for mammalian cell transfection.
- Its effects on cell viability and protein synthesis are not well understood.
Purpose of the Study:
- To investigate the impact of Opti-MEM on A549 human lung epithelial cell viability, morphology, and protein synthesis.
- To compare the efficacy and cell viability of small interfering RNA (siRNA) transfection in Opti-MEM versus Dulbecco's modified Eagle's medium (DMEM).
Main Methods:
- Culturing A549 cells in Opti-MEM.
- Assessing cell viability and morphology.
- Analyzing protein levels of specific cellular targets (CLCC1, PSMA2, HSPA5).
- Performing siRNA transfections in both Opti-MEM and DMEM with fetal bovine serum.
Main Results:
- Opti-MEM adversely affected A549 cell viability and morphology.
- Protein levels of CLCC1, PSMA2, and HSPA5 were dysregulated in Opti-MEM.
- Similar siRNA knockdown efficacy was achieved in DMEM with higher cell viability compared to Opti-MEM.
Conclusions:
- Opti-MEM negatively impacts cell viability and protein expression in A549 cells.
- DMEM with serum is a better alternative for siRNA transfection, maintaining higher cell viability.
- Researchers must carefully consider Opti-MEM's effects in experimental design and interpretation.
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