Comparison of hepatic transcription profiles of locked ribonucleic acid antisense oligonucleotides: evidence of distinct pathways contributing to non-target mediated toxicity in mice

Toxicological Sciences : an Official Journal of the Society of Toxicology
Satoko Kakiuchi-KiyotaNagappan Mathialagan

Abstract

Development of LNA gapmers, antisense oligonucleotides used for efficient inhibition of target RNA expression, is limited by non-target mediated hepatotoxicity issues. In the present study, we investigated hepatic transcription profiles of mice administered non-toxic and toxic LNA gapmers. After repeated administration, a toxic LNA gapmer (TS-2), but not a non-toxic LNA gapmer (NTS-1), caused hepatocyte necrosis and increased serum alanine aminotransferase levels. Microarray data revealed that, in addition to gene expression patterns consistent with hepatotoxicity, 17 genes in the clathrin-mediated endocytosis (CME) pathway were altered in the TS-2 group. TS-2 significantly down-regulated myosin 1E (Myo1E), which is involved in release of clathrin-coated pits from plasma membranes. To map the earliest transcription changes associated with LNA gapmer-induced hepatotoxicity, a second microarray analysis was performed using NTS-1, TS-2, and a severely toxic LNA gapmer (HTS-3) at 8, 16, and 72 h following a single administration in mice. The only histopathological change observed was minor hepatic hypertrophy in all LNA groups across time points. NTS-1, but not 2 toxic LNA gapmers, increased immune response genes at 8 and 16 h but ...Continue Reading

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