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Smoking-Related Interstitial Fibrosis and Smoker's Macrophages
Namiko Taniuchi1, Yoshinobu Saito1, Norio Motoda2
1Department of Pulmonary Medicine, Nippon Medical School Musashi Kosugi Hospital.
Abstract:
Smoking-related interstitial lung diseases (SRILDs) are a group of heterogeneous diffuse pulmonary parenchymal diseases associated with tobacco exposure. Smoking-related interstitial fibrosis (SRIF) is relatively recent, a pathologically defined form of SRILDs. SRIF is characterized by the accumulation of macrophages in the alveolar spaces, which is associated with interstitial inflammation and fibrosis. The macrophages frequently contain light brown pigment and are called 'smoker's macrophages'. Patients with SRIF who have clinical evidence of interstitial lung disease are most commonly relatively young, heavy smokers with abnormalities on chest computed tomography showing ground-glass opacities, peripheral consolidation, and reticulation. Although SRIF is caused by cigarette smoking, the exact pathophysiological mechanisms by which smoking causes this type of interstitial fibrosis remain unknown. The degree of fibrosis and appearance of macrophage aggregates are important points of distinction when evaluating and diagnosing SRIF. Macrophage heterogeneity, particularly the activation and function of monocyte-derived alveolar macrophages (Mo-AMs) and interstitial macrophages (IMs), has important implications for the pathogenesis of SRIF and developing treatments. Further researches focused on smoker's macrophages are needed to understand of the pathogenesis of SRIF.
Insights
Smoking-related interstitial fibrosis (SRIF) is a lung disease linked to smoking, characterized by specific macrophage accumulation. Further research into these "smoker
Area of Science:
- Pulmonology
- Pathology
- Toxicology
Background:
- Smoking-related interstitial lung diseases (SRILDs) encompass diverse lung conditions linked to tobacco use.
- Smoking-related interstitial fibrosis (SRIF) is a distinct, pathologically defined SRILD.
- SRIF involves macrophage accumulation in alveolar spaces, leading to inflammation and fibrosis.
Purpose of the Study:
- To summarize the characteristics of Smoking-related interstitial fibrosis (SRIF).
- To highlight the role of macrophages in SRIF pathogenesis.
- To identify areas for future research in understanding SRIF mechanisms.
Main Methods:
- Review of pathological and clinical findings in SRIF.
- Analysis of computed tomography (CT) imaging features.
- Discussion of macrophage heterogeneity in disease development.
Main Results:
- SRIF patients are typically young, heavy smokers with characteristic CT findings (ground-glass opacities, consolidation, reticulation).
- Key diagnostic features include the degree of fibrosis and the appearance of macrophage aggregates ('smoker's macrophages').
- Macrophage heterogeneity, including monocyte-derived alveolar macrophages (Mo-AMs) and interstitial macrophages (IMs), is implicated in SRIF pathogenesis.
Conclusions:
- The precise mechanisms by which smoking causes SRIF are not fully understood.
- Understanding smoker's macrophages is crucial for elucidating SRIF pathogenesis.
- Further research is needed to develop effective treatments for SRIF.
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