ZFIN ID: ZDB-PUB-110214-24
Whole-Body Analysis of a Viral Infection: Vascular Endothelium is a Primary Target of Infectious Hematopoietic Necrosis Virus in Zebrafish Larvae
Ludwig, M., Palha, N., Torhy, C., Briolat, V., Colucci-Guyon, E., Brémont, M., Herbomel, P., Boudinot, P., and Levraud, J.P.
Date: 2011
Source: PLoS pathogens   7(2): e1001269 (Journal)
Registered Authors: Briolat, Valerie, Colucci-Guyon, Emma, Herbomel, Philippe, Levraud, Jean-Pierre
Keywords: Larvae, Zebrafish, Endothelial cells, Blood flow, Red blood cells, Endothelium, Viral transmission and infection, Cell staining
MeSH Terms:
  • Animals
  • Animals, Genetically Modified
  • Body Temperature/physiology
  • Disease Progression
  • Endothelium, Vascular/virology
  • Erythrocytes/pathology
  • Erythrocytes/virology
  • Fish Diseases/diagnosis
  • Fish Diseases/immunology
  • Fish Diseases/pathology
  • Fish Diseases/virology*
  • Infectious hematopoietic necrosis virus/immunology
  • Infectious hematopoietic necrosis virus/physiology*
  • Larva/immunology
  • Larva/virology
  • Models, Biological
  • Rhabdoviridae Infections/immunology
  • Rhabdoviridae Infections/pathology
  • Rhabdoviridae Infections/veterinary
  • Rhabdoviridae Infections/virology*
  • Time Factors
  • Viral Load/methods*
  • Viral Load/veterinary
  • Virus Attachment
  • Zebrafish/immunology
  • Zebrafish/physiology
  • Zebrafish/virology*
PubMed: 21304884 Full text @ PLoS Pathog.
FIGURES
ABSTRACT
The progression of viral infections is notoriously difficult to follow in whole organisms. The small, transparent zebrafish larva constitutes a valuable system to study how pathogens spread. We describe here the course of infection of zebrafish early larvae with a heat-adapted variant of the Infectious Hematopoietic Necrosis Virus (IHNV), a rhabdovirus that represents an important threat to the salmonid culture industry. When incubated at 24°C, a permissive temperature for virus replication, larvae infected by intravenous injection died within three to four days. Macroscopic signs of infection followed a highly predictable course, with a slowdown then arrest of blood flow despite continuing heartbeat, followed by a loss of reactivity to touch and ultimately by death. Using whole-mount in situ hybridization, patterns of infection were imaged in whole larvae. The first infected cells were detectable as early as 6 hours post infection, and a steady increase in infected cell number and staining intensity occurred with time. Venous endothelium appeared as a primary target of infection, as could be confirmed in fli1:GFP transgenic larvae by live imaging and immunohistochemistry. Disruption of the first vessels took place before arrest of blood circulation, and hemorrhages could be observed in various places. Our data suggest that infection spread from the damaged vessels to underlying tissue. By shifting infected fish to a temperature of 28°C that is non-permissive for viral propagation, it was possible to establish when virus-generated damage became irreversible. This stage was reached many hours before any detectable induction of the host response. Zebrafish larvae infected with IHNV constitute a vertebrate model of an hemorrhagic viral disease. This tractable system will allow the in vivo dissection of host-virus interactions at the whole organism scale, a feature unrivalled by other vertebrate models.
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