Robust Innate Immunity of Young Rabbits Mediates Resistance to Rabbit Hemorrhagic Disease Caused by Lagovirus Europaeus GI.1 But Not GI.2

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ID: 113088
2018
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Abstract
The rabbit caliciviruses Lagovirus europaeus GI.1 and GI.2 both cause acute necrotizing hepatitis in European rabbits (Oryctolagus cuniculus). Whilst GI.2 is highly virulent in both young and adult rabbits, rabbits younger than eight weeks of age are highly resistant to disease caused by GI.1, although they are still permissive to infection and viral replication. To investigate the underlying mechanism(s) of this age related resistance to GI.1, we compared liver transcriptomes of young rabbits infected with GI.1 to those of adult rabbits infected with GI.1 and young rabbits infected with GI.2. Our data suggest that kittens have constitutively heightened innate immune responses compared to adult rabbits, particularly associated with increased expression of major histocompatibility class II molecules and activity of natural killer cells, macrophages, and cholangiocytes. This enables them to respond more rapidly to GI.1 infection than adult rabbits and thus limit virus-induced pathology. In contrast, these responses were not fully developed during GI.2 infection. We speculate that the observed downregulation of multiple genes associated with innate immunity in kittens during GI.2 infection may be due to virally-mediated immunomodulation, permitting fatal disease to develop. Our study provides insight into the fundamental host–pathogen interactions responsible for the differences in age-related susceptibility, which likely plays a critical role in defining the success of GI.2 in outcompeting GI.1 in the field.
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Authors Matthew J. Neave;Robyn N. Hall;Nina Huang;Kenneth A. McColl;Peter Kerr;Marion Hoehn;Jennifer Taylor;Tanja Strive;Neave, Matthew J.;Hall, Robyn N.;Huang, Nina;McColl, Kenneth A.;Kerr, Peter;Hoehn, Marion;Taylor, Jennifer;Strive, Tanja;
Journal Viruses
Year 2018
DOI
10.3390/v10090512
URL
https://doi.org/10.3390/v10090512
Keywords
transcriptome rabbit rna-seq calicivirus gi.1 rhdv rabbit hemorrhagic disease virus lagovirus gi.2 rhdv-2

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