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[Production of fibronectin and PGE2 by cultured human alveolar macrophages]
Abstract:
Production of fibronectin (Fn) and prostaglandin E2 (PGE2) by human alveolar macrophages (AM) which were obtained by bronchoalveolar lavage was studied in vitro. AM obtained from patients with idiopathic interstitial pneumonia (IIP) produced much more Fn than those from normal volunteers but produced less amounts of PGE2. We also tested the effect of lipopolysaccharide (LPS), phorbol 12-myristate 13-acetate (PMA), zymosan and albumin-anti albumin complex (alb-anti alb) on production of Fn and PGE2 from AM. LPS, PMA and zymosan suppressed Fn production but stimulated PGE2 production by AM from patients with IIP but indomethacin reversed the suppressive effect of LPS, PMA and zymosan on Fn production. On the contrary, alb-anti alb stimulated Fn production by AM. Furthermore, exogenous PGE2 suppressed Fn production by AM from patients with IIP in a dose-dependent manner. These data suggest that Fn production by AM may be changed by different stimuli or different states of disease, and there is close relationship between the production of Fn and PGE2 by AM.
Insights
Human alveolar macrophages (AM) from patients with idiopathic interstitial pneumonia (IIP) produce more fibronectin (Fn) but less prostaglandin E2 (PGE2). Stimuli alter these productions, revealing a link between Fn and PGE2 in IIP.
Area of Science:
- Immunology
- Cell Biology
- Pulmonary Medicine
Context:
- Alveolar macrophages (AM) play a crucial role in lung immunity and inflammation.
- Idiopathic interstitial pneumonia (IIP) is a group of severe lung diseases characterized by inflammation and fibrosis.
- Fibronectin (Fn) and prostaglandin E2 (PGE2) are key mediators in inflammatory and fibrotic processes.
Purpose:
- To investigate the production of fibronectin (Fn) and prostaglandin E2 (PGE2) by human alveolar macrophages (AM) in vitro.
- To compare Fn and PGE2 production in AM from patients with idiopathic interstitial pneumonia (IIP) versus normal volunteers.
- To examine the effects of various stimuli (LPS, PMA, zymosan, albumin-anti-albumin complex) and exogenous PGE2 on Fn and PGE2 production by AM.
Summary:
- AM from IIP patients produced significantly higher levels of fibronectin (Fn) compared to normal controls, but lower levels of prostaglandin E2 (PGE2).
- Lipopolysaccharide (LPS), phorbol 12-myristate 13-acetate (PMA), and zymosan suppressed Fn production while stimulating PGE2 production in IIP-AM. Indomethacin reversed the suppressive effect of these stimuli on Fn production.
- Albumin-anti-albumin complex (alb-anti alb) stimulated Fn production, whereas exogenous PGE2 dose-dependently suppressed Fn production by IIP-AM, indicating a complex interplay between these mediators.
Impact:
- These findings highlight altered Fn and PGE2 production by AM in IIP, suggesting their potential roles in disease pathogenesis.
- The study reveals a close relationship and inverse correlation between Fn and PGE2 production by AM under different conditions and stimuli.
- Understanding these interactions could lead to novel therapeutic strategies targeting macrophage-mediated inflammation and fibrosis in IIP.