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Chronic nicotine inhibits inflammation and promotes influenza infection

Seddigheh Razani-Boroujerdi1, Shashi P Singh, Cindy Knall

  • 1Lovelace Respiratory Research Institute, 2425 Ridgecrest Dr. SE, Albuquerque, NM 87108, USA.

Cellular Immunology
|November 16, 2004
PubMed

Insights

Nicotine suppresses immune cell movement, potentially explaining why smoking impairs wound healing and increases respiratory infection risk. This study investigated nicotine

Area of Science:

  • Immunology
  • Pharmacology
  • Respiratory Medicine

Background:

  • Epidemiological studies link smoking to impaired wound healing and increased respiratory infections.
  • Nicotine's anti-inflammatory effects are known, but the underlying mechanisms are unclear.
  • Inflammation plays a crucial role in host defense and tissue repair.

Purpose of the Study:

  • To elucidate the mechanism by which nicotine affects inflammatory responses.
  • To investigate nicotine's impact on leukocyte migration and function during inflammation and infection.

Main Methods:

  • Rats and mice were administered nicotine via miniosmotic pumps.
  • Inflammatory responses were induced using turpentine or influenza virus.
  • Leukocyte migration, chemotaxis, and chemokine signaling in peripheral blood mononuclear cells (PBMC) were assessed.

Main Results:

  • Nicotine suppressed leukocyte migration to inflammatory sites.
  • Nicotine increased influenza viral titers in the lungs.
  • Impaired chemotaxis and chemokine signaling (Ca(2+) response) were observed in PBMC.
  • Receptor density for chemoattractants remained unaffected.

Conclusions:

  • Nicotine impairs leukocyte migration and chemokine signaling, contributing to reduced inflammation.
  • These effects may explain the association between smoking, delayed wound healing, and increased respiratory infections.

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