Cholesterol Conjugated Uniform and Gapmer Phosphorothioate Oligonucleotides Targeted Against PKC-α and C-rafGene Expression

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Abstract
In vitra and in vivo antitumor activity of phosphorothioate antisense oligonucleotides targeted against two protein kinases within the mitogen-activated protein (MAP) kinase signaling cascade has been well documented by ISIS 3521/CGP 6412XA (targeted against PKC-α protein) and ISIS 5132KGP69846A (targeted against C-rwfl kinase). For both of these compounds, cationic lipid formulations are necessary to observe any pharmacological activity in cell culture. In contrast, in vivo functional delivery of phosphorothioate oligonucleotides to cells in tissues does not appear to be a prohlem. These oligonucleotides have demonstrated reduction in either PKC-α or C-raf gene expression in tissues or human tumor xenografts following systemic administration.

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