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Updated: Mar 13, 2026

Time-lapse 3D Imaging of Phagocytosis by Mouse Macrophages
Published on: October 19, 2018
Macrophages' Choice: Take It In or Keep It Out
1Department of Microbiology and Immunology, Weill Cornell Medicine, 1300 York Avenue, New York, NY 10065, USA.
Macrophages in tuberculosis granulomas form epithelial-like junctions via E-cadherin. Disrupting this in zebrafish models disorganized granulomas and offered protection, revealing new insights into macrophage roles in granulomatous diseases.
Area of Science:
- Immunology
- Cell Biology
- Infectious Diseases
Background:
- Tuberculosis (TB) involves granulomas, where macrophages can adopt an epithelioid morphology.
- The precise cellular mechanisms driving macrophage differentiation within granulomas remain incompletely understood.
Purpose of the Study:
- To investigate the role of cell-cell junction formation in macrophage reprogramming within granulomas.
- To explore the function of E-cadherin in Mycobacterium-induced granuloma formation and integrity.
Main Methods:
- Utilized the Mycobacterium marinum-zebrafish model system.
- Examined macrophage behavior and granuloma structure.
- Interfered with E-cadherin function in macrophages.
Main Results:
- Demonstrated that granuloma macrophages undergo reprogramming involving E-cadherin-dependent, epithelial-like cell-cell junction formation.
- Showed that interference with E-cadherin function disorganized granuloma structure.
- Observed that disrupting E-cadherin-mediated junctions protected zebrafish from infection.
Conclusions:
- Macrophage reprogramming in granulomas involves the formation of epithelial-like cell junctions.
- E-cadherin plays a critical role in maintaining granuloma integrity.
- Targeting E-cadherin function in macrophages presents a potential strategy for treating granulomatous diseases.
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