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Pathogenesis of acute respiratory illness caused by human parainfluenza viruses

Henrick Schomacker1, Anne Schaap-Nutt, Peter L Collins

  • 1Laboratory of Infectious Diseases, RNA Viruses Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, USA.

Current Opinion in Virology
|June 20, 2012
PubMed

Insights

Human parainfluenza viruses (HPIVs) cause respiratory illness, with severe disease in infants and the immunocompromised. Research reveals how HPIVs overcome immune defenses in airway cells for replication and spread.

Area of Science:

  • Virology
  • Immunology
  • Respiratory Medicine

Background:

  • Human parainfluenza viruses (HPIVs) are frequent causes of acute respiratory illness across all age groups.
  • Severe HPIV disease disproportionately affects infants, children, and immunocompromised individuals.
  • Specific HPIV types are associated with distinct clinical syndromes: HPIV1/2 with croup, and HPIV3 with bronchiolitis/pneumonia.

Purpose of the Study:

  • To investigate the molecular mechanisms by which HPIVs evade and inhibit innate cellular immune responses.
  • To understand how HPIVs achieve efficient replication, local spread, and transmission within the respiratory tract.
  • To explore the role of ex vivo human airway epithelium models in studying HPIV tropism, pathology, and inflammatory responses.

Main Methods:

  • Molecular studies to identify viral evasion strategies against host immune defenses.
  • Analysis of HPIV replication and spread in respiratory epithelial cells.
  • Ex vivo studies using human airway epithelium to examine virus tropism, cellular pathology, and inflammatory responses.

Main Results:

  • HPIVs possess mechanisms to effectively evade and block host innate immune responses, facilitating viral replication.
  • Replication is primarily confined to respiratory epithelial cells, with systemic spread rare except in severely immunocompromised hosts.
  • Early infection events in the airway epithelium influence subsequent adaptive immune responses and disease severity.

Conclusions:

  • Understanding HPIV immune evasion is crucial for developing effective antiviral strategies.
  • Ex vivo human airway models provide valuable insights into HPIV pathogenesis and host-virus interactions.
  • Early host-pathogen interactions in the respiratory tract dictate the course of HPIV infection and disease outcome.

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