Zheng SJ, Zhong S, Zhang JJ, Chen F, Ren H, Deng CL. Distribution and anti-HBV effects of antisense oligodeoxynu-cleotides conjugated to galactosylated poly-L-lysine.
World J Gastroenterol 2003;
9:1251-5. [PMID:
12800234 PMCID:
PMC4611794 DOI:
10.3748/wjg.v9.i6.1251]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To describe distribution of the phosphorothioated antisense oligodeoxynucleotides (PS-asODNs) conjugated to galactosylated poly-L-lysine (Gal-PLL) in mice, and to observe their effects on expression of HBV gene in the 2.2.15 cells and transgenic mice.
METHODS: According to the result of direct sequencing of PCR amplified products, a 16 mer phosphorothioate analogue of the antisense oligodeoxynucleotides (PS-asODNs) directed against the HBV U5-like region was conjugated to the hepatotropic Gal-PLL molecules. Its distribution was demonstrated using asODNs labeled with 32P at the 5’ terminus with a T4-polynucleotide Kinase. Its inhibition effect on HBV expression was observed in the transfected 2.2.15 cells and transgenic mice.
RESULTS: The Gal-PLL and asODNs could form stable complex at a molar ratio of 2:1. As shown in the HBV-transfected 2.2.15 cells, the inhibition effects of asODNs alone and asODNs conjugated to Gal-PLL, at 10 μmol/L for both, on HBsAg and HBeAg production were different, the former being 70% and 58%, respectively, and the latter being 96% and 82%, respectively. A more pronounced reduction was also observed in viral DNA load in the culture supernatant for the test with Gal-PLL-asODNs. Among many mouse organs, livers retained more asODNs molecules after administration. The preferential concentration in liver was found to be 52.14% for Gal-PLL-asODNs, as high as 2.38-fold of that for asODNs (21.9%). Both elements decreased gradually in liver, with 2.9% of the former, 5.99% of the latter retained 24 h after the administration. The injection interval, therefore, was recommended to be 24 h. In the transgenic mice, serum HBsAg decreased significantly (P < 0.01) at the 12th day after administrating Gal-PLL- asODNs, the serum HBV DNA turned negative in 4 of the 6 mice.
CONCLUSION: Antisense oligodeoxynucleotides conjugated to Gal-PLL can be concentrated in liver and intaked by hepatocytic cells. This may result in specific inhibition of expression and replication of HBV in vitro and in vivo.
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