Differences in MDR1 mRNA Expression in Gastric and Colon Cancer Cells
Author Information
Author(s): Lee Tae-Bum, Park Jung-Hee, Min Young-Don, Kim Kyung-Jong, Choi Cheol-Hee
Primary Institution: Chosun University
Hypothesis
The study examines whether the degree of methylation at the promoter site of the MDR1 gene is closely associated with MDR1 gene expression in gastric and colon cancer cells.
Conclusion
MDR1 mRNA levels in gastric cancer cells are significantly lower than those in colon cancer cells, partly due to different epigenetic regulations.
Supporting Evidence
- 90% of gastric cancer cells were found to be methylated at the MDR1 promoter.
- MDR1 mRNA was not detected in 10 gastric cancer cell lines but was variable in 7 of 9 colon cancer cell lines.
- 5-aza-2'-deoxcytidine increased MDR1 mRNA levels in 60% of gastric cells.
- Trichostatin A increased MDR1 mRNA levels in 70% of gastric cancer cells.
Takeaway
This study found that stomach cancer cells have much less of a certain gene that helps pump out cancer drugs compared to colon cancer cells, which might make them harder to treat.
Methodology
The study used PCR and real-time PCR assays to measure MDR1 mRNA levels and assessed methylation status through quantification PCR-based methylation and bisulfite DNA sequencing analyses.
Limitations
The study did not examine protein levels of MDR1 and focused only on mRNA expression.
Participant Demographics
10 gastric cancer cell lines and 9 colon cancer cell lines were used.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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