Assembly and infection efficacy of hepatitis B virus surface protein exchanges in 8 hepatitis D virus genotype isolates
Background & Aims - Chronic HDV infections cause the most severe form of viral hepatitis. HDV requires HBV envelope proteins for hepatocyte entry, particle assembly and release. Eight HDV and 8 HBV genotypes have been identified. However, there are limited data on the replication competence of d...
Gespeichert in:
| Hauptverfasser: | , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
5 May 2021
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| In: |
Journal of hepatology
Year: 2021, Jahrgang: 75, Heft: 2, Pages: 311-323 |
| ISSN: | 1600-0641 |
| DOI: | 10.1016/j.jhep.2021.03.025 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jhep.2021.03.025 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0168827821002294 
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| Verfasserangaben: | Wenshi Wang, Florian A. Lempp, Franziska Schlund, Lisa Walter, Charlotte C. Decker, Zhenfeng Zhang, Yi Ni, Stephan Urban |
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| 245 | 1 | 0 | |a Assembly and infection efficacy of hepatitis B virus surface protein exchanges in 8 hepatitis D virus genotype isolates |c Wenshi Wang, Florian A. Lempp, Franziska Schlund, Lisa Walter, Charlotte C. Decker, Zhenfeng Zhang, Yi Ni, Stephan Urban |
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| 520 | |a Background & Aims - Chronic HDV infections cause the most severe form of viral hepatitis. HDV requires HBV envelope proteins for hepatocyte entry, particle assembly and release. Eight HDV and 8 HBV genotypes have been identified. However, there are limited data on the replication competence of different genotypes and the effect that different HBV envelopes have on virion assembly and infectivity. - Methods - We subcloned complementary DNAs (cDNAs) of all HDV and HBV genotypes and systematically studied HDV replication, assembly and infectivity using northern blot, western blot, reverse-transcription quantitative PCR, and in-cell ELISA. - Results - The 8 HDV cDNA clones initiated HDV replication with noticeable differences regarding replication efficacy. The 8 HBV-HBsAg-encoding constructs all supported secretion of subviral particles, however variations in envelope protein stoichiometry and secretion efficacy were observed. Co-transfection of all HDV/HBV combinations supported particle assembly, however, the respective pseudo-typed HDVs differed with respect to assembly kinetics. The most productive combinations did not correlate with the natural geographic distribution, arguing against an evolutionary adaptation of HDV ribonucleoprotein complexes to HBV envelopes. All HDVs elicited robust and comparable innate immune responses. HBV envelope-dependent differences in the activity of the EMA-approved entry inhibitor bulevirtide were observed, however efficient inhibition could be achieved at therapeutically applied doses. Lonafarnib also showed pan-genotypic activity. - Conclusions - HDVs from different genotypes replicate with variable efficacies. Variations in HDV genomes and HBV envelope proteins are both major determinants of HDV egress and entry efficacy, and consequently assembly inhibition by lonafarnib or entry inhibition by bulevirtide. These differences possibly influence HDV pathogenicity, immune responses and the efficacy of novel drug regimens. - Lay summary - HDV requires the envelope protein of HBV for assembly and to infect human cells. We investigated the ability of different HDV genotypes to infect cells and replicate. We also assessed the effect that envelope proteins from different HBV genotypes had on HDV infectivity and replication. Herein, we confirmed that genotypic differences in HDV and HBV envelope proteins are major determinants of HDV assembly, de novo cell entry and consequently the efficacy of novel antivirals. | ||
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| 650 | 4 | |a virus assembly | |
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