Modification of MyD88 mRNA splicing and inhibition of IL-1beta signaling in cell culture and in mice with a 2'-O-methoxyethyl-modified oligonucleotide

The Journal of Immunology : Official Journal of the American Association of Immunologists
Timothy A VickersN M Dean

Abstract

A number of proinflammatory cytokines, including IL-1beta, signal through the adaptor protein MyD88. This signaling leads to phosphorylation of IL-1R-associated kinase-1 (IRAK-1) and, ultimately, activation of the NF-kappaB transcription factor. A splice variant of MyD88 (MyD88(S)), which lacks the ability to couple IRAK-1 to NF-kappaB, has been described. A chemically modified antisense oligonucleotide (ASO) that alters the splicing ratio of MyD88 to MyD88(S) in both cell culture and in animals has been identified. The ASO (ISIS 337846) binds to exon II donor sites in the MyD88 pre-mRNA. By manipulating levels of MyD88 splicing, proinflammatory signaling through the IL-1R has been shown to be diminished, both in cell culture and in mouse liver. To our knowledge, this represents the first example of modulation of RNA splicing of an endogenous gene target in animals after systemic ASO dosing and suggests that this mechanism may be useful as a novel modulator of inflammatory stimuli.

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Citations

Jun 14, 2008·Expert Opinion on Investigational Drugs·Vasilios G AthyrosDimitri P Mikhailidis
Feb 10, 2012·Molecular Pharmacology·Elizabeth S BarrieWolfgang Sadee
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