Effect of tenofovir disoproxil fumarate on drug-resistant HBV clones - 24/12/15
Summary |
Background & aims |
Tenofovir disoproxil fumarate (TDF) has been approved for chronic hepatitis B treatment, and favorable susceptibility of hepatitis B virus (HBV) has been indicated. However, differences in TDF susceptibility among HBV genotypes and drug-resistant strains are unclear. In this study, TDF susceptibilities between genotypes A and C were evaluated in vitro and in vivo using several drug-resistant HBV clones.
Methods |
HBV expression plasmids were constructed from sera of HBV carriers, and drug-resistant substitutions were introduced by site-directed mutagenesis. TDF susceptibility was evaluated by changes of core-associated HBV replication intermediates in vitro or by change of serum HBV DNA in human hepatocyte chimeric mice carrying each HBV clone in vivo.
Results |
TDF susceptibilities of lamivudine-resistant clones (rtL180M/M204V) and lamivudine plus entecavir-resistant clones (rtL180M/S202G/M204V) were similar to wild type clones in vitro. However, lamivudine plus adefovir-resistant clones (rtA181T/N236T) acquired tolerance to TDF, and the rtN236T mutation was considered to be a causal substitution for TDF resistance. Furthermore, genotypic differences in TDF susceptibility were also observed between genotypes A and C in vitro, and the differences could be confirmed in vivo (p = 0.023).
Conclusions |
The present study indicates that TDF susceptibility varies among HBV genotypes and drug-resistant HBV clones.
Le texte complet de cet article est disponible en PDF.Highlights |
• | We compared tenofovir disoproxil fumarate (TDF) susceptibilities between HBV genotype A and C. |
• | N236T substitution in HBV RT region is significantly associated with TDF susceptibility. |
• | Genotypic differences in TDF susceptibility were observed between genotypes A and C in vitro and in vivo. |
Keywords : Hepatitis B virus, Tenofovir disoproxil fumarate, Susceptibility, HBV genotype, Drug resistance
Abbreviation : HBV, NAs, ETV, LMV, ADV, TDF
Plan
Vol 72 - N° 1
P. 91-102 - janvier 2016 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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