Design of a targeted peptide nucleic acid prodrug to inhibit hepatic human microsomal triglyceride transfer protein expression in hepatocytes
article
In this study, we present the design and synthesis of an antisense peptide nucleic acid (asPNA) prodrug, which displays an improved biodistribution profile and an equally improved capacity to reduce the levels of target mRNA. The prodrug, K(GalNAc)2-asPNA, comprised of a 14-mer sequence complementary to the human microsomal triglyceride transfer protein (huMTP) gene, conjugated to a high-affinity tag for the hepatic asialoglycoprotein receptor (K(GalNAc)2). The prodrug was avidly bound and rapidly internalized by HepG2s. After iv injection into mice, K(GalNAc)2-asPNA accumulated in the parenchymal liver cells to a much greater extent than nonconjugated PNA (46% ± 1% vs 3.1% ± 0.5% of the injected dose, respectively). The prodrug was able to reduce MTP mRNA levels in HepG2 cells by 35-40% (P < 0.02) at 100 nM in an asialoglycoprotein receptor- and sequence-dependent fashion. In conclusion, hepatocyte-targeted PNA prodrugs combine a greatly improved tropism with an enhanced local intracellular availability and activity, making them attractive therapeutics to lower the expression level of hepatic target genes such as MTP.
icals / CAS alpha-Fetoproteins; asialofetuin; Asialoglycoproteins; Carrier Proteins; microsomal triglyceride transfer protein; Peptide Nucleic Acids; Prodrugs; RNA, Messenger
icals / CAS alpha-Fetoproteins; asialofetuin; Asialoglycoproteins; Carrier Proteins; microsomal triglyceride transfer protein; Peptide Nucleic Acids; Prodrugs; RNA, Messenger
Topics
Eukaryotaalpha fetoproteinasialofetuincarrier proteinmessenger RNAmicrosomal triglyceride transfer proteinpeptide nucleic acidprodruganimalC57BL mousecell culturechemical structurechemistrydrug delivery systemdrug designdrug effectgene expression regulationgeneticsliver cellliver microsomemetabolismmousenucleotide sequencesynthesistransport at the cellular levelalpha-FetoproteinsAnimalsAsialoglycoproteinsBase SequenceBiological TransportCarrier ProteinsCells, CulturedDrug Delivery SystemsDrug DesignGene Expression RegulationHepatocytesHumansKineticsMiceMice, Inbred C57BLMicrosomes, LiverMolecular StructurePeptide Nucleic AcidsProdrugsRNA, MessengerTumor Cells, Cultured
TNO Identifier
953601
ISSN
10431802
Source
Bioconjugate Chemistry, 13(2), pp. 295-302.
Pages
295-302
Files
To receive the publication files, please send an e-mail request to TNO Repository.