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Effect of cyclooxygenase-2 antisense oligodeoxyribonucleotides in A-549 lung cancer cells
Ute Windhövel1, Carl Haasper, Michael Duchrow
1Department of Surgery/Surgical Research Laboratory, University Clinic of Schleswig-Holstein, Campus Lübeck, 23562 Lübeck, Germany. windhoev@uni-luebeck.de
Background:
Cyclooxygenase (COX)-2 is overexpressed in several tumor entities and seems to play a key role in carcinogenesis. This makes it a potential target in cancer therapy.
Materials And Methods:
Twelve phosphorothioate-modified antisense oligonucleotides (asODNs) against six targets of COX-2 mRNA were transfected to A-549 lung carcinoma cells. COX-2 mRNA and protein levels were determined by quantitative RT-PCR and flow cytometry, respectively. Cell growth was assessed by measuring Alamar Blue reduction.
Results:
The tested asODNs exhibited a range of activities. The most potent asODN reduced uninduced COX-2 mRNA to 66% and protein level to 75%, respectively. While this asODN did not influence cell growth, a 15% growth reduction was observed after transfection of another asODN which suppressed COX-2 mRNA to 71% and protein level to 84%.
Conclusion:
The use of asODNs directed against COX-2 mRNA is a promising approach to inhibit COX-2 expression in tumor cells.
Insights
Antisense oligonucleotides (asODNs) targeting cyclooxygenase (COX)-2 mRNA show promise for cancer therapy. Certain asODNs effectively reduced COX-2 expression and inhibited tumor cell growth, indicating a potential therapeutic strategy.
Area of Science:
- Molecular Biology
- Cancer Research
- Drug Discovery
Background:
- Cyclooxygenase (COX)-2 is frequently overexpressed in various cancers.
- COX-2 plays a significant role in carcinogenesis, making it a potential therapeutic target.
- Inhibiting COX-2 is a promising strategy for cancer treatment.
Purpose of the Study:
- To investigate the efficacy of antisense oligonucleotides (asODNs) in inhibiting COX-2 expression.
- To evaluate the impact of COX-2 inhibition on lung carcinoma cell growth.
Main Methods:
- Transfection of A-549 lung carcinoma cells with twelve phosphorothioate-modified asODNs targeting COX-2 mRNA.
- Quantification of COX-2 mRNA and protein levels using RT-PCR and flow cytometry.
- Assessment of cell growth inhibition via Alamar Blue reduction assay.
Main Results:
- The asODNs demonstrated varying degrees of activity against COX-2.
- The most effective asODN reduced uninduced COX-2 mRNA to 66% and protein to 75%.
- One asODN induced a 15% reduction in cell growth by suppressing COX-2 expression.
Conclusions:
- Antisense oligonucleotides targeting COX-2 mRNA represent a viable approach for inhibiting COX-2 expression in tumor cells.
- This strategy holds potential for developing novel cancer therapies.
