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Phosphorothioate Oligodeoxynucleotide Inhibition of Restenosis
1Division of Cardiology, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York.
Journal of Thrombosis and Thrombolysis
|April 15, 2000
Summary
Phosphorothioate oligodeoxynucleotides (PS oligos) show promise in preventing restenosis after angioplasty. These compounds exhibit multiple inhibitory effects beyond antisense mechanisms, impacting smooth muscle cell proliferation and migration.
Area of Science:
- Cardiovascular Research
- Molecular Biology
- Pharmacology
Background:
- Antisense therapy using phosphorothioate oligodeoxynucleotides (PS oligos) is a potential strategy to inhibit angioplasty restenosis.
- PS oligos have demonstrated inhibition of vascular smooth muscle cell (SMC) proliferation and in vivo neointimal formation.
- Recent findings highlight a G-quartet inhibitory effect of PS oligos, distinct from hybridization-dependent antisense mechanisms.
Purpose of the Study:
- To investigate the non-G-quartet, non-sequence-specific inhibitory effects of PS oligos on SMCs.
- To elucidate the mechanisms by which PS oligos affect SMC proliferation, migration, and neointimal hyperplasia.
- To understand the role of PS oligos in modulating growth factor interactions and fibrinolytic balance.
Main Methods:
- In vitro studies on vascular smooth muscle cell (SMC) proliferation and migration.
- In vivo studies using rat carotid artery balloon injury model to assess neointimal hyperplasia.
- Analysis of PS oligo binding to heparin-binding growth factors like PDGF.
- Assessment of SMC tissue plasminogen activator and plasminogen activator inhibitor-1 levels.
Main Results:
- S-dC28, a PS oligo, demonstrated non-G-quartet, non-sequence-specific inhibition of SMC proliferation and migration in vitro.
- S-dC28 reduced neointimal hyperplasia after rat carotid balloon injury in vivo.
- PS oligos avidly bind to heparin-binding growth factors, including PDGF, influencing their activity.
- S-dC28 attenuated PDGF-induced SMC tissue plasminogen activator levels, suggesting an antifibrinolytic effect.
Conclusions:
- The development of PS oligos for inhibiting angioplasty restenosis requires consideration of multiple inhibitory effects.
- These effects include hybridization-specific antisense, non-G-quartet, and non-G-quartet, non-sequence-specific mechanisms.
- The pleiotropic nature of PS oligos, including their interaction with growth factors, is crucial for their therapeutic potential.