NLRP3-Inflammasome Inhibition during Respiratory Virus Infection Abrogates Lung Immunopathology and Long-Term Airway Disease Development

• Published in: Viruses Vol. 13; no. 4; p. 692
• Main Authors: Malinczak, Carrie-Anne, Schuler, Charles F., Duran, Angela J., Rasky, Andrew J., Mire, Mohamed M., Núñez, Gabriel, Lukacs, Nicholas W., Fonseca, Wendy
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 16.04.2021; MDPI
• Subjects: adults; Allergic diseases; Allergies; Animals; Animals, Newborn; Asthma; childhood; Children; Cytokines; Cytokines - immunology; disease severity; early-life RSV; Female; Flow cytometry; Furans - administration & dosage; Gene expression; Histology; Hypersensitivity; IL-1β; immunopathology; Indenes - administration & dosage; Infants; Infections; Inflammasomes; Inflammasomes - antagonists & inhibitors; Inflammasomes - genetics; Inflammasomes - immunology; Inflammation; Laboratories; Lung - immunology; Lung - pathology; Lung - virology; Lungs; Lymphocytes T; MCC950; Mice; Mice, Inbred BALB C; Mice, Knockout; Monocyte chemoattractant protein 1; Neonates; NLR Family, Pyrin Domain-Containing 3 Protein - antagonists & inhibitors; NLR Family, Pyrin Domain-Containing 3 Protein - genetics; NLR Family, Pyrin Domain-Containing 3 Protein - immunology; NLRP3-inflammasome; Pathogens; Proteins; Respiratory syncytial virus; Respiratory Syncytial Virus Infections - immunology; Respiratory Syncytial Virus, Human - immunology; Respiratory tract diseases; Respiratory Tract Diseases - immunology; Respiratory Tract Diseases - prevention & control; Respiratory Tract Diseases - virology; respiratory virus; risk; Software; Sulfonamides - administration & dosage; therapeutics; viruses; β-Interferon; United States > US; MCC950; respiratory virus; lung innate viral immunity; NLRP3-inflammasome; asthma; IL-1β; early-life RSV
• DOI: 10.3390/v13040692
• ISSN: 1999-4915

Respiratory syncytial virus (RSV) infects most infants by two years of age. It can cause severe disease leading to an increased risk of developing asthma later in life. Previously, our group has shown that RSV infection in mice and infants promotes IL-1β production. Here, we characterized the role of NLRP3-Inflammasome activation during RSV infection in adult mice and neonates. We observed that the inhibition of NLRP3 activation using the small molecule inhibitor, MCC950, or in genetically modified NLRP3 knockout (Nlrp3−/−) mice during in vivo RSV infection led to decreased lung immunopathology along with a reduced expression of the mucus-associated genes and reduced production of innate cytokines (IL-1β, IL-33 and CCL2) linked to severe RSV disease while leading to significant increases in IFN-β. NLRP3-inflammasome inhibition or deletion diminished Th2 cytokines and inflammatory cell infiltration into the lungs. Furthermore, NLRP3 inhibition or deletion during early-life RSV infection led to reducing viral-exacerbated allergic response in a mouse model of RSV-induced allergy exacerbation. Here, we demonstrated the critical role of NLRP3-inflammasome activation in RSV immunopathology and the related long-term airway alteration. Moreover, these findings suggest the NLRP3-inflammasome as a potential therapeutic target to attenuate severe RSV disease and limit childhood asthma development.