Serum cytokine levels, cigarette smoking and airway responsiveness among pregnant women

Int Arch Allergy Immunol. 2003 Feb;130(2):158-64. doi: 10.1159/000069008.

Abstract

Background: Five to twenty percent of healthy, nonasthmatic individuals exhibit airway hyperreactivity. Because cytokines are important intermediates in airway responses, we investigated the relationship between serum cytokines and airway responsiveness in a well-characterized population of pregnant women.

Methods: We analyzed serum levels of interleukin-4 (IL-4), IL-5, IL-6, interferon-gamma (IFN-gamma), and granulocyte-macrophage colony-stimulating factor (GM-CSF) in frozen sera from 240 pregnant nonasthmatic subjects from a previous study of airway responsiveness and preterm labor for their relationship to methacholine challenge test results.

Results: Serum IFN-gamma and GM-CSF levels were significantly related to levels of methacholine airway responsiveness among nonasthmatics in this population. Nonasthmatics with PD(20) <8 micromol (the highest level of airway responsiveness) had the highest mean serum levels of IFN-gamma and GM-CSF, those with 8 <or= PD(20) <or= >50 micromol had intermediate levels, and those with PD(20) >>50 mol had the lowest levels. Both serum IFN-gamma and GM-CSF levels were also significantly related to the log dose-response slope for methacholine responsiveness. These relationships were confirmed in a multiple linear regression analysis controlling for age, ethnic background, and cigarette smoking. Current smoking was uniformly associated with decreased cytokine levels.

Conclusion: IFN-gamma, GM-CSF, and other cytokines may be useful serum markers in population studies of airway responsiveness.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • African Continental Ancestry Group
  • Airway Resistance / immunology*
  • Bronchoconstrictor Agents / pharmacology
  • Cytokines / blood*
  • Cytokines / immunology
  • European Continental Ancestry Group
  • Female
  • Humans
  • Immunoglobulin E / blood
  • Immunoglobulin E / immunology
  • Methacholine Chloride / pharmacology
  • Pregnancy / blood
  • Pregnancy / immunology*
  • Regression Analysis
  • Smoking / blood
  • Smoking / immunology*

Substances

  • Bronchoconstrictor Agents
  • Cytokines
  • Methacholine Chloride
  • Immunoglobulin E