Phenotypic characterization of patient dengue virus isolates in BALB/c mice differentiates dengue fever and dengue hemorrhagic fever from dengue shock syndrome

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• 作者：Anne Tuiskunen (1) (2) (3)
  Maria Wahlstr?m (2)
  Jakob Bergstr?m (2)
  Philippe Buchy (4)
  Isabelle Leparc-Goffart (3)
  ?ke Lundkvist (1) (2)
  
• 关键词：dengue virus ; mouse model ; tropism ; clinical isolate ; cytokines ; dengue hemorrhagic fever ; flavivirus
• 刊名：Virology Journal
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：8
• 期：1
• 全文大小：335KB
• 参考文献：1. Tuiskunen A, Monteil V, Plumet S, Boubis L, Wahlstrom M, Duong V, Buchy P, Lundkvist A, Tolou H, Leparc-Goffart I: Phenotypic and genotypic characterization of dengue virus isolates differentiates dengue fever and dengue hemorrhagic fever from dengue shock syndrome. / Arch Virol 2011, in press.
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• 作者单位：Anne Tuiskunen (1) (2) (3)
  Maria Wahlstr?m (2)
  Jakob Bergstr?m (2)
  Philippe Buchy (4)
  Isabelle Leparc-Goffart (3)
  ?ke Lundkvist (1) (2)
  
  1. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
  2. Swedish Institute for Communicable Disease Control, Solna, Sweden
  3. Virology Department, French Army Forces Biomedical Institute (IRBA), Marseille, France
  4. Virology Unit, Institut Pasteur in Cambodia, Phnom Penh, Cambodia
  
• ISSN：1743-422X

文摘

Background Dengue virus (DENV) infection is the most common arthropod-borne viral disease in man and there are approximately 100 million infections annually. Despite the global burden of DENV infections many important questions regarding DENV pathogenesis remain unaddressed due to the lack of appropriate animal models of infection and disease. A major problem is the fact that no non-human species naturally develop disease similar to human dengue fever (DF) or dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS). Apart from other risk factors for severe dengue such as host genetics and secondary infection with a heterologous DENV, virus virulence is a risk factor that is not well characterized. Results Three clinical DENV-1 isolates from Cambodian patients experiencing the various forms of dengue disease (DF, DHF, and DSS) were inoculated in BALB/c mice at three different concentrations. The DENV-1 isolates had different organ and cell tropism and replication kinetics. The DENV-1 isolate from a DSS patient infected the largest number of mice and was primarily neurotropic. In contrast, the DENV-1 isolates from milder clinical dengue cases infected predominantly lungs and liver, and to a lesser extent brain. In addition, infection with the DENV isolate derived from a DSS patient persisted for more than two weeks in a majority of mice compared to the other DENV-1 isolates that peaked during the first week. Conclusions These results confirm the in vitro findings of the same DENV-1 isolates, that showed that the isolate derived from a DSS patient can be distinguished based on phenotypic characteristics that differ from the isolates derived from a DF and DHF case [1]. We observed in this study that the DSS virus isolate persist longer in vivo with extensive neuroinvasion in contrast to the other DENV-1 isolates originating in milder human cases. Genomic characterization of the three clinical isolates identified six amino acid substitutions unique for the DSS isolates that were located both in structural genes (M and E) and in non-structural genes (NS1, NS3, and NS5). The characterization of these clinically distinct DENV-1 isolates highlight that DENVs within the same genotype may have different in vivo phenotypes. Highlights -Clinical DENV-1 isolates have different organ tropism in BALB/c mice. -The isolate from a DSS patient is primarily neurotropic compared to the other isolates. -The DENV-1 isolates have different in vivo replication kinetics. -The isolate from a DSS patient persists longer compared to the other isolates. -These phenotypic differences confirm our earlier in vitro findings with the same DENV-1 isolates. Thus, DENVs within the same serotype and genotype may differ enough to affect clinical conditions in vivo.