Palmitoylated phosphodiester gapmer designs with albumin binding capacity and maintained in vitro gene silencing activity
Jazyk angličtina Země Velká Británie, Anglie Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
29800498
DOI
10.1002/jgm.3025
Knihovny.cz E-zdroje
- Klíčová slova
- HER3, LNA-gapmer, albumin, palmitoyl, phosphodiester, systemic delivery,
- MeSH
- albuminy metabolismus MeSH
- antisense oligonukleotidy chemie genetika metabolismus MeSH
- lidé MeSH
- lipoylace MeSH
- molekulární struktura MeSH
- nádorové buněčné linie MeSH
- receptor erbB-3 genetika MeSH
- techniky in vitro MeSH
- transfekce MeSH
- umlčování genů * MeSH
- vazba proteinů MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- albuminy MeSH
- antisense oligonukleotidy MeSH
- ERBB3 protein, human MeSH Prohlížeč
- receptor erbB-3 MeSH
BACKGROUND: Antisense gapmer oligonucleotide drugs require delivery and biodistribution enabling technologies to increase in vivo efficacy. An attractive approach is their binding and consequent transport by the endogenous human serum albumin pool as mediated by fatty acid incorporation into the gapmer design. METHODS: The present study investigated the effect of palmitoyl modification and position on albumin-binding, cellular uptake and in vitro gene silencing of gapmers with either a phosphorothioate (PS) or phosphodiester (PO) backbone. RESULTS: Two palmitoyls positioned exclusively at the 5' end, or a single palmitoyl at both the 3' and 5' positions, showed similar binding to human serum albumin as demonstrated by a gel-shift assay. Decreased cellular uptake determined by flow cytometry (27% compared to nonpalmitoyl gapmers) was observed for palmitoylated Cy5.5 labelled gapmers. However, HER3 (human epidermal growth factor receptor 3) gene silencing was exhibited by the palmitoylated gapmers with transfection agent in PC-3 and Caco-2 cells (68% and 62%, respectively), which was comparable to nonpalmitoyl gapmers (68% and 82%, respectively). Importantly, PO gapmers with a single palmitoyl positioned at both the 3' and 5' positions showed high silencing efficiencies (68% and 66% in PC-3 and Caco-2 cells, respectively) similar to those of PS nonpalmitoylated gapmers (67% and 66% in PC-3 and Caco-2 cells, respectively) in the absence of a transfection agent. CONCLUSIONS: The present study defines phosphodiester gapmer design criteria exhibiting high gene silencing activity and albumin binding that may be utilized with potentially less in vivo toxicity that can be associated with phosphorothioate gapmer designs.
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