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[The suppressive effects of smoking on antibody production in experimental hypersensitivity pneumonitis in rabbits]
1First Department of Medicine, School of Medicine, Hokkaido University, Sapporo, Japan.
Abstract:
Farmer's lung disease is one type of hypersensitivity pneumonitis (HP) in dairy farmers, and is usually caused by Micropolyspora faeni (Mf). It has been reported that the positive rate of precipitin antibody to Mf in smoking dairy farmers is one-eighth to one-half of that in nonsmoking dairy farmers. To clarify the mechanism of this phenomenon, by using an experimental HP model in rabbits, we investigated 1) the effects of short (5 weeks) and long (20 weeks)-term cigarette smoke exposure on the antibody formation, 2) the effects of 30 weeks of smoke exposure on the accessory cell function of alveolar macrophages (AM). Smoking exerted variable influences on antibody production, depending on the duration of smoke exposure, and we confirmed that long-term smoke exposure had suppressive effects. In addition AM from smoked rabbits suppressed lymphoproliferative response to autologous spleen cells. It was concluded that in this experimental HP, smoking affects the functions of both AM and lymphocytes, and that it suppresses antibody production as long as the smoke exposure continues.
Insights
Smoking suppresses antibody production in Farmer's lung disease, a type of hypersensitivity pneumonitis. Long-term cigarette smoke exposure impairs alveolar macrophage function and antibody formation in dairy farmers.
Area of Science:
- Immunology
- Pulmonary Medicine
- Environmental Health
Context:
- Farmer's lung disease (FLD) is a significant occupational hypersensitivity pneumonitis (HP) in dairy farmers, often triggered by Micropolyspora faeni (Mf).
- Previous observations indicate a lower prevalence of Mf-specific antibodies in smoking dairy farmers compared to non-smokers, suggesting a potential immunomodulatory role of smoking.
Purpose:
- To elucidate the mechanisms underlying the reduced antibody response to Mf in smoking dairy farmers.
- To investigate the impact of varying durations of cigarette smoke exposure on antibody formation and alveolar macrophage (AM) function in an experimental HP model.
Summary:
- This study utilized a rabbit model to assess the effects of short-term (5 weeks) and long-term (20 weeks) cigarette smoke exposure on antibody production against Mf.
- Long-term smoke exposure (20 weeks) demonstrated a suppressive effect on antibody formation.
- Furthermore, 30 weeks of smoke exposure impaired the accessory cell function of AM, evidenced by suppressed lymphoproliferative responses.
Impact:
- The findings suggest that cigarette smoking modulates immune responses in hypersensitivity pneumonitis by affecting both alveolar macrophage and lymphocyte functions.
- Long-term smoking exposure appears to suppress antibody production, potentially influencing the immunopathogenesis of Farmer's lung disease.
- This research highlights the complex interplay between environmental exposures and immune responses in occupational lung diseases.