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Updated: Jan 18, 2026
09:27
Multicellular Human Alveolar Model Composed of Epithelial Cells and Primary Immune Cells for Hazard Assessment
Published on: May 6, 2020
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Intercellular communication between alveolar epithelial cells and macrophages.
Anja Beckmann1, Alexander Grissmer1, Carola Meier1
1Department of Anatomy and Cell Biology, Saarland University, Homburg, Saar, Germany.
Summary
Human alveolar macrophages communicate with alveolar epithelial cells via gap junctions. This intercellular communication is crucial for regulating the lung micro-environment in health and disease.
Area of Science:
- Cell biology
- Pulmonology
- Immunology
Background:
- The alveolus is a vulnerable lung site.
- Alveolar macrophages regulate the lung micro-environment in health and disease.
- Intercellular communication via gap junctions between alveolar macrophages and epithelial cells is known in mice but poorly understood in humans.
Purpose of the Study:
- To investigate gap junctional intercellular communication between human alveolar macrophages and epithelial cells.
Main Methods:
- Co-culture model of human epithelial and macrophage cell lines.
- Immunoblot analysis.
- Freeze fracture replica immunolabeling and electron microscopy.
Main Results:
- Connexin (Cx) 43 protein expression was detected.
- Ultrastructurally defined Cx43 gap junctions were identified between human alveolar cells.
- Evidence of intercellular gap junctions between distinct human alveolar cell types was found.
Conclusions:
- Human alveolar macrophages may directly communicate with the alveolar epithelium through gap junctions.
- This communication pathway could orchestrate the lung micro-environment in both physiological and pathological conditions.
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