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Human parainfluenza virus 3 neuraminidase activity contributes to dendritic cell maturation

Maria-Arantxa Horga1, Salvador Macip, Ana C Tuyama

  • 1Department of Pediatric Infectious Diseases, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1657, New York, NY 10029, USA. maria.horga@mssm.edu

Viral Immunology
|October 11, 2005
PubMed

Insights

Human parainfluenza 3 virus hemagglutinin-neuraminidase (HN) activity influences dendritic cell (DC) maturation. HN

Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • Mechanisms of dendritic cell (DC) immunomodulation by parainfluenza viruses remain largely uncharacterized.
  • The hemagglutinin-neuraminidase (HN) glycoprotein of human parainfluenza 3 (HPF3) virus possesses receptor binding and desialylation functions.
  • Investigating HN's role in DC maturation is crucial for understanding viral pathogenesis and immune responses.

Purpose of the Study:

  • To determine if the hemagglutinin-neuraminidase (HN) glycoprotein of human parainfluenza 3 (HPF3) virus influences dendritic cell (DC) maturation.
  • To elucidate the specific contribution of HN's neuraminidase activity to DC activation and maturation.
  • To analyze the impact of wild-type versus neuraminidase-deficient HN on DC surface marker expression and cytokine profiles.

Main Methods:

  • Human myeloid dendritic cells (DCs) were exposed to live or UV-inactivated HPF3 viruses.
  • Viruses utilized either wild-type HN or a mutated form with reduced neuraminidase activity.
  • DC maturation was assessed by analyzing surface marker upregulation (CD83, CD86), morphological changes, and cytokine expression patterns.

Main Results:

  • Exposure to both live and inactivated HPF3 viruses induced DC maturation, evidenced by CD83 and CD86 upregulation and altered cytokine profiles.
  • DCs infected with the neuraminidase-deficient HN variant exhibited a lower level of maturation compared to those infected with wild-type HN.
  • These findings indicate that HN's neuraminidase activity plays a significant role in promoting DC maturation.

Conclusions:

  • The neuraminidase activity of the HPF3 virus HN glycoprotein is a key factor in modulating dendritic cell (DC) maturation.
  • HN's desialylation function contributes to the activation and maturation of DCs during parainfluenza virus infection.
  • Understanding this mechanism provides insights into host-pathogen interactions and potential therapeutic targets.

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