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Smoking alters the phenotype of macrophages in induced sputum

C Lensmar1, G Elmberger, M Sköld

  • 1Department of Medicine, Karolinska Hospital, Stockholm, Sweden.

Respiratory Medicine
|August 6, 1998
PubMed

Insights

Chronic smoke exposure decreases key surface molecules on pulmonary macrophages (PM), impacting their antigen-presenting function. This study analyzed immune markers in sputum from smokers and non-smokers.

Area of Science:

  • Pulmonary immunology
  • Cellular immunology
  • Respiratory medicine

Background:

  • Pulmonary macrophages (PM) play a crucial role in lung immunity.
  • Chronic smoke exposure is known to alter immune cell function in the lungs.

Purpose of the Study:

  • To investigate the impact of chronic smoke exposure on the expression of surface and intracellular molecules on pulmonary macrophages.
  • To assess changes in immune cell populations within induced sputum (IS) of smokers compared to non-smokers.

Main Methods:

  • Induced sputum (IS) was collected from healthy smokers and non-smokers.
  • Cell viability, total cell counts, and differential cell counts were determined.
  • Pulmonary macrophages were immunologically characterized using monoclonal antibodies (RFD1, RFD7, CD11b, CD54, CD68, CD71, HLA-DR).

Main Results:

  • Smokers exhibited a higher percentage of macrophages and a lower proportion of neutrophils in IS.
  • A significant decrease in the expression of RFD1, HLA-DR, CD71, and CD54 was observed on macrophages from smokers.
  • No significant differences were found in viability and total cell counts between groups.

Conclusions:

  • Chronic smoke exposure leads to reduced expression of critical surface molecules on pulmonary macrophages.
  • These molecular changes suggest an impaired antigen-presenting function of PM in smokers.
  • Findings highlight the immunomodulatory effects of smoking on lung macrophages.

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