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Inhibition of cell adhesion to plastic substratum by phosphorothioate oligonucleotide
P H Watson1, R T Pon, R P Shiu
1Department of Physiology, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.
Abstract:
Antisense oligonucleotides have been widely used to achieve specific inhibition of targeted gene expression. However, the mechanism of action is not well understood and in many systems sequence-independent effects occur. We have recently shown that chronic administration of an antisense c-myc phosphorothioate oligonucleotide can specifically inhibit expression of the c-myc protein and growth in human breast cancer cells. We now identify an additional effect of the same oligonucleotide on cell adhesion. Transient delivery through electroporation of 2.5 microM antisense-myc oligonucleotide to MCF-7 cells results in 85% inhibition of adhesion to plastic substratum within 24 h. Both the onset of this effect and the subsequent recovery occur without a change in cell viability, growth, or alteration of adhesion to Matrigel, collagen IV, laminin, or fibronectin. However, no parallel changes in c-myc mRNA or protein expression are detectable, suggesting that in this instance inhibition of adhesion caused by antisense-myc oligonucleotide may involve a mechanism independent of the target sequence.
Insights
Antisense oligonucleotides targeting c-myc can inhibit breast cancer cell growth. Unexpectedly, the same drug significantly reduces cell adhesion to plastic, independent of c-myc gene expression changes.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Antisense oligonucleotides (ASOs) are utilized for targeted gene expression inhibition.
- The precise mechanisms of ASO action and potential sequence-independent effects require further elucidation.
- Previous research demonstrated c-myc ASO efficacy in inhibiting human breast cancer cell growth.
Purpose of the Study:
- To investigate the effects of an antisense c-myc oligonucleotide on human breast cancer cell adhesion.
- To determine if observed effects on cell adhesion correlate with changes in c-myc gene expression.
- To explore potential sequence-independent mechanisms of ASO action.
Main Methods:
- Transient delivery of antisense c-myc oligonucleotide via electroporation to MCF-7 cells.
- Assessment of cell adhesion to plastic substratum and various extracellular matrix components (Matrigel, collagen IV, laminin, fibronectin).
- Quantification of c-myc mRNA and protein levels to correlate with adhesion changes.
Main Results:
- A significant inhibition (85%) of MCF-7 cell adhesion to plastic was observed within 24 hours post-electroporation.
- This inhibition of adhesion occurred without affecting cell viability or growth.
- No significant changes in c-myc mRNA or protein expression were detected, suggesting a sequence-independent mechanism.
Conclusions:
- Antisense c-myc oligonucleotides can induce sequence-independent effects on cell adhesion in breast cancer cells.
- The observed inhibition of cell adhesion is distinct from the intended effect on c-myc gene expression.
- Further research is needed to understand the non-specific pathways involved in ASO-mediated cell adhesion modulation.
