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. 2021 Feb 22;13(1):e0383121.
doi: 10.1128/mbio.03831-21. Epub 2022 Feb 15.

Modeling Infection and Tropism of Human Parainfluenza Virus Type 3 in Ferrets

Affiliations

Modeling Infection and Tropism of Human Parainfluenza Virus Type 3 in Ferrets

Laurine C Rijsbergen et al. mBio. .

Abstract

Human parainfluenza virus type 3 (HPIV-3) is a significant cause of lower respiratory tract infections, with the most severe disease in young infants, immunocompromised individuals, and the elderly. HPIV-3 infections are currently untreatable with licensed therapeutics, and prophylactic and therapeutic options are needed for patients at risk. To complement existing human airway models of HPIV-3 infection and develop an animal model to assess novel intervention strategies, we evaluated infection and transmission of HPIV-3 in ferrets. A well-characterized human clinical isolate (CI) of HPIV-3 engineered to express enhanced green fluorescent protein (rHPIV-3 CI-1-EGFP) was passaged on primary human airway epithelial cells (HAE) or airway organoids (AO) to avoid tissue culture adaptations. rHPIV3 CI-1-EGFP infection was assessed in vitro in ferret AO and in ferrets in vivo. Undifferentiated and differentiated ferret AO cultures supported rHPIV-3 CI-1-EGFP replication, but the ferret primary airway cells from AO were less susceptible and permissive than HAE. In vivo rHPIV-3 CI-1-EGFP replicated in the upper and lower airways of ferrets and targeted respiratory epithelial cells, olfactory epithelial cells, type I pneumocytes, and type II pneumocytes. The infection efficiently induced specific antibody responses. Taken together, ferrets are naturally susceptible to HPIV-3 infection; however, limited replication was observed that led to neither overt clinical signs nor ferret-to-ferret transmission. However, in combination with ferret AO, the ferret model of HPIV-3 infection, tissue tropism, and neutralizing antibodies complements human ex vivo lung models and can be used as a platform for prevention and treatment studies for this important respiratory pathogen. IMPORTANCE HPIV-3 is an important cause of pediatric disease and significantly impacts the elderly. Increasing numbers of immunocompromised patients suffer from HPIV-3 infections, often related to problems with viral clearance. There is a need to model HPIV-3 infections in vitro and in vivo to evaluate novel prophylaxis and treatment options. Currently existing animal models lack the potential for studying animal-to-animal transmission or the effect of immunosuppressive therapy. Here, we describe the use of the ferret model in combination with authentic clinical viruses to further complement human ex vivo models, providing a platform to study approaches to prevent and treat HPIV-3 infection. Although we did not detect ferret-to-ferret transmission in our studies, these studies lay the groundwork for further refinement of the ferret model to immunocompromised ferrets, allowing for studies of severe HPIV-3-associated disease. Such models for preclinical evaluation of prophylaxis and antivirals can contribute to reducing the global health burden of HPIV-3.

Keywords: animal models; parainfluenza virus; viral pathogenesis.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

FIG 1
FIG 1
rHPIV-3 CI-1-EGFP replication kinetics in ferret AO and AO at ALI. (A) Undifferentiated ferret and human AO were inoculated with rHPIV-3 CI-1-EGFP at the indicated dose and monitored for 3 days. Representative images at 3 dpi are shown. (B) Ferret and human AO at ALI were inoculated with 500, 5,000, or 50,000 TCID50 rHPIV-3 CI-1-EGFP and monitored until 4 dpi. The EGFP+ surface area was determined by tile scans based on fluorescence, and viral titers were determined by endpoint titrations of apical washes (TCID50/mL). (C) Ferret and human AO at ALI were fixed in 4% paraformaldehyde (PFA) at 4 dpi and used for indirect immunofluorescence using antibodies against zona occludens-1 (tight junctions, orange), acetylated α-tubulin (cilia, red), and Hoechst (nuclei, blue). Representative images are shown. Two independent experiments are shown, and all experiments were performed in triplicate. Differences between the growth curves were statistically analyzed by two-way analysis of variance (*, P = 0.05; **, P = 0.01; ***, P = 0.001; ****, P < 0.0001). Means and individual replicates are shown.
FIG 2
FIG 2
Design of in vivo experiment, clinical signs, and absence of direct contact transmission after rHPIV-3 CI-1-EGFP inoculation. (A) Design of the ferret experiment. The red symbols represent experimentally inoculated ferrets, either intranasal (i.n.) or intratracheal (i.t.), and the contact ferrets are represented by the gray symbols. (B) Body temperature of 3 ferrets that were inoculated intranasally with 105 TCID50 rHPIV-3 CI-1-EGFP. The hourly sliding mean is shown, and the vertical line represents the day of inoculation. (C) Body weights, in grams, of experimentally inoculated ferrets during the course of the experiment (red lines and symbols) and contact ferrets (gray lines and symbols). (D) Endpoint neutralizing titers measured on Vero cells of both the experimentally inoculated and contact ferrets following rHPIV-3 CI-1-EGFP inoculation (bottom horizontal line represents the lower limit of detection, and upper horizontal line represents the upper limit of detection).
FIG 3
FIG 3
rHPIV-3 CI-1-EGFP replication kinetics in nose and throat swabs. Viral loads were detected in nose (left) and throat (right) swabs by RT-qPCR following i.n. and/or i.t. inoculation of ferrets. Asterisks indicate the date of euthanization of each animal. y axis = 40 minus the cycle threshold (40-Ct).
FIG 4
FIG 4
rHPIV-3 CI-1-EGFP dissemination and tropism in the upper respiratory tract of ferrets. (A) The nasal septum (4 dpi) and nasal concha (4 dpi) of rHPIV-3 CI-1-EGFP-inoculated ferrets were directly screened for fluorescence by confocal microscopy after necropsy, and representative images are shown. (B) Representative H&E and IHC images of a formalin-fixed whole head of a ferret inoculated with rHPIV-3 CI-1-EGFP (5 dpi). The whole heads are depicted in the top panels, while two areas with EGFP+ cells are shown enlarged in the bottom panels. Arrows in the enlargements indicate infected cells, and the EGFP+ cells are visible by homogenous to fine granular brown cytoplasmic staining.
FIG 5
FIG 5
rHPIV-3 CI-1-EGFP dissemination and tropism in the lower respiratory tract of ferrets. (A) Lung slices from agarose-inflated lungs of rHPIV-3 CI-1-EGFP-infected ferrets (4 dpi) were fixed in 2% PFA and Hoechst stained for nuclei before imaging on a confocal microscope. Representative images are shown. (B and C) Representative hematoxylin and eosin and IHC images of formalin-inflated and formalin-fixed lungs from inoculated ferrets (4 dpi). The insets show areas with EGFP+ cells that are enlarged in the panels below, and rHPIV-3 CI-1-EGFP-infected cells are indicated by the arrows. (B) Infected type I (boldface arrow) and type II pneumocytes (dashed arrow). (C) Examples of rHPIV-3 CI-1-EGFP-infected bronchial glandular epithelial cells.

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