Abstract
To establish a readily manipulable small-animal system for the study of human hepatitis delta virus (HDV) replication in vivo, plasmid DNAs containing head-to-tail cDNA dimers of HDV were inoculated intramuscularly into mice. Genomic-sense HDV RNA was detected in the injected muscle within 1 week and increased to substantial levels by week 7 postinjection. The intramuscular accumulation of HDV RNA was determined to be the direct result of viral RNA replication by three lines of evidence: (i) injected tissues also accumulated antigenomic-sense HDV RNA, (ii) plasmid DNA that synthesized primary transcripts of antigenomic sense also led to the accumulation of genomic-sense HDV RNA, and (iii) injection of a cDNA dimer defective in antigenomic RNA cleavage failed to produce detectable HDV RNA in muscle. Immunohistochemical analysis of injected muscle demonstrated the presence and nuclear localization of hepatitis delta antigen in myocytes. Finally, sera from DNA-injected mice contained antibodies specific for delta antigen, indicating the induction of an immunological response to the intracellularly expressed antigen. These findings demonstrated the ability of HDV RNA to replicate in skeletal muscle and provide a useful system for the study of HDV replication, delta antigen processing, and its presentation to the immune system in vivo. Furthermore, this system offers an efficiently replicating RNA as a potential vehicle for in vivo gene transfer.
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