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Hendra virus infection of bat (Pteropus alecto) and human cells

ABSTRACT: SILAC labeled human kidney cells (293 cells) or bat kidney cells (PakiT03cells)were infected with Hendra virus for 8 or 24 hours and compared to uninfected control cells. Protein identification and quantitation relied on a combination of Uniprot lists of proteins and Proteomics Informed by Transcriptomics (PIT) analysis whereby RNA extracted from the same samples was deep sequenced and the sequencing data was used to construct mRNA from which possible ORFS were inferred and used as a search space by MaxQuant.

INSTRUMENT(S): LTQ Orbitrap Velos

ORGANISM(S): Hendra Virus Horse/australia/hendra/1994 (ncbitaxon:928303) Homo Sapiens (ncbitaxon:9606) Pteropus Alecto (ncbitaxon:9402)

SUBMITTER: Dr David A Matthews

PROVIDER: MSV000079832 | MassIVE | Fri Jun 17 09:50:00 BST 2016

SECONDARY ACCESSION(S): PXD001165

REPOSITORIES: MassIVE

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Project description:Background: Coevolution between pathogens and their hosts decreases host morbidity and mortality. Bats can tolerate viruses which can be lethal to other vertebrate orders, including humans. Bat adaptations to infection include localized immune response, early pathogen sensing, high interferon expression without pathogen stimulation, and regulated inflammatory response. The immune reaction is costly, and bats suppress high-cost metabolism during torpor. In the temperate zone, bats hibernate in winter, utilizing a specific behavioural adaptation to survive detrimental environmental conditions and lack of energy resources. Hibernation torpor involves major physiological changes that pose an additional challenge to bat-pathogen coexistence. Here, we compared bat cellular reaction to viral challenge under conditions simulating hibernation, evaluating the changes between torpor and euthermia. Results: We infected the olfactory nerve-derived cell culture of Myotis myotis with an endemic bat pathogen, European bat lyssavirus 1 (EBLV-1). After infection, the bat cells were cultivated at two different temperatures – 37 ◦ C and 5 ◦ C - to examine the cell response during conditions simulating euthermia and torpor, respectively. The mRNA isolated from the cells was sequenced and analysed for differential gene expression attributable to the temperature and/or infection treatment. In conditions simulating euthermia, infected bat cells produce an excess signalling by multitude of pathways involved in apoptosis and immune regulation influencing proliferation of regulatory cell types which can, in synergy with other produced cytokines, contribute to viral tolerance. We found no up- or downregulated genes expressed in infected cells cultivated at conditions simulating torpor compared to non-infected cells cultivated under the same conditions. When studying the reaction of uninfected cells to the temperature treatment, bat cells show an increased production of heat shock proteins (HSPs) with chaperone activity, improving the bat’s ability to repair molecular structures damaged due to the stress related to the temperature change. Conclusions: The lack of bat cell reaction to infection in conditions simulating hibernation may contribute to the virus tolerance or persistence in bats. Together with the cell damage repair mechanisms induced in response to hibernation, the immune regulation may promote bats’ ability to act as reservoirs of zoonotic viruses such as lyssaviruses.

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Hendra virus infection of bat (Pteropus alecto) and human cells

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