Unknown,Transcriptomics,Genomics,Proteomics

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Cynomolgus macaque model of H7N9 influenza infection

ABSTRACT: TheÂ objectiveÂ of this study is to characterize the response to newly emerged, highly pathogenic H7N9 influenza virus isolated from human patients in 2013 in China. This study examines the pathogenesis of H7N9 influenza in cynomolgus macaques.Â The study compares lung lesions to adjacent right lower lobe lung tissue in animals necropsied at days 3 and 6 post-infection (n=4 animals/timepoint).Â 3-4 lesions from each animal were collected and equal amounts of pooled RNA from lesions from individual animals at each time point were used for microarray. 8 cynomolgus macaques were infected via oral, intraocular, intranasal, and intratracheal administration of a combined total of 7x10^6 TCID50. Lungs, lung lesions, and trachea samples were collected from serial sacrifices of 4 animals each at day 3 and day 6. Infection produced a moderate-severe, self-limiting respiratory infection, and was not lethal. We performed microarray analysis (using Agilent Rhesus arrays) on all lungs, lung lesions, and trachea collected for the study.

ORGANISM(S): Macaca fascicularis

SUBMITTER: Michael Katze

PROVIDER: E-GEOD-48976 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Annually, influenza A viruses circulate the world causing wide-spread sickness, economic loss, and death. One way to better defend against influenza virus-induced disease may be to develop novel host-based therapies, targeted at mitigating viral pathogenesis through the management of virus-dysregulated host functions. However, mechanisms that govern aberrant host responses to influenza virus infection remain incompletely understood. We previously showed that the pandemic H1N1 virus influenza A/California/04/2009 (H1N1; CA04) has enhanced pathogenicity in the lungs of cynomolgus macaques relative to a seasonal influenza virus isolate (A/Kawasaki/UTK-4/2009 (H1N1; KUTK4)). Here, we used microarrays to identify host gene sequences that were highly differentially expressed (DE) in CA04-infected macaque lungs, and we employed a novel strategy M-bM-^@M-^S combining functional and pathway enrichment analyses, transcription factor binding site enrichment analysis and protein-protein interaction data M-bM-^@M-^S to create a CA04 differentially regulated host response network. This network describes enhanced viral RNA sensing, immune cell signaling and cell cycle arrest in CA04-infected lungs, and highlights a novel, putative role for the MYC-associated zinc finger (MAZ) transcription factor in regulating these processes. Lung tissues used for microarray studies were obtained from 13 female cynomolgus macaques infected with influenza viruses. 6 animals were inoculated with influenza A/California/04/2009 and 6 animals were inoculated with influenza A/Kawasaki/UTK-4/2009. 1 uninfected animal served as a negative control. On days 3 and 7 post-infection (p.i.), lung tissues were harvested from the middle and lower lung lobes of 3animals in each infection group (N = 26 total samples were collected, 3 samples were removed from the study due to low RNA quality). All but 3 samples were collected from visually apparent virus-induced gross lesions. Two lung tissue samples were obtained from middle and lower lobes of the uninfected animal at the start of the experiment.

Project description:Non-human primates are the animals closest to humans for use in influenza A virus challenge studies, in terms of their phylogenetic relatedness, physiology and immune systems. Previous studies have shown that cynomolgus macaques (Macaca fascicularis) are permissive for infection with H1N1pdm influenza virus. These studies have typically used combined challenge routes, with the majority being intra-tracheal delivery, and high doses of virus (> 107 infectious units). This paper describes the outcome of novel challenge routes (inhaled aerosol, intra-nasal instillation) and low to moderate doses (103 to 106 plaque forming units) of H1N1pdm virus in cynomolgus macaques. All 4 challenge groups showed sero-conversion and evidence of virus replication, although the disease was sub-clinical. Intra-nasal challenge led to an infection confined to the nasal cavity. A low dose (103 plaque forming units) did not lead to detectable infectious virus shedding, but a 1000-fold higher dose led to virus shedding in all intra-nasal challenged animals. In contrast, aerosol and intra-tracheal challenge routes led to infections throughout the respiratory tract, although shedding from the nasal cavity was less reproducible between animals compared to the high-dose intra-nasal challenge group. Intra-tracheal and aerosol challenges induced a transient lymphopaenia, similar to that observed in influenza-infected humans, and greater virus-specific cellular immune responses in the blood were observed in these groups in comparison to the intra-nasal challenge groups. Activation of lung macrophages and innate immune response genes were detected at days 5 to 7 post-challenge. The kinetics of infection, both virological and immunological, were broadly in line with human influenza A virus infections. These more authentic infection models should be valuable in the determination of anti-influenza efficacy of novel entities against less severe (and thus more common) influenza infections.

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Cynomolgus macaque model of H7N9 influenza infection

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