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Isolation of Human Lymphatic Endothelial Cells by Multi-parameter Fluorescence-activated Cell Sorting
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Crohn's disease is an obstructive lymphangitis.
Herbert J Van Kruiningen1, Jean-Frederic Colombel2, Pietro Tonelli3
1Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, CT 06269, United States.
Journal of Crohn'S & Colitis
|April 13, 2026
Summary
Crohn's disease is a lymphatic vasculature condition, characterized by granuloma-occluded lymphatics leading to inflammation and tissue changes. This pathology, recognized since 1939, remains underacknowledged in gastroenterology.
Area of Science:
- Gastroenterology
- Pathology
- Immunology
Background:
- Crohn's disease has been historically identified as a lymphatic vasculature disorder by pathologists since 1939.
- Current gastroenterological textbooks and associations largely overlook this lymphatic basis.
- Published works supporting the lymphatic vascular theory of Crohn's disease are referenced.
Purpose of the Study:
- To highlight the underrecognized role of lymphatic vasculature in Crohn's disease pathogenesis.
- To present evidence of lymphatic occlusion by granulomas in Crohn's disease patients.
- To describe the pathological consequences of lymphatic obstruction.
Main Methods:
- Review of historical and published works on Crohn's disease and lymphatic vasculature.
- Analysis of a montage of obstructed lymphatics from Crohn's disease patients.
- Immunohistochemistry to identify granuloma attachment to lymphatic endothelium.
Main Results:
- Lymphatics in Crohn's disease patients are occluded by granulomas, focally attached to the endothelium.
- Granuloma attachment leads to upstream lymphocyte plugs and downstream lymphangiectasia.
- Observed pathology includes edema, tissue stiffening, and boggy mucosa.
Conclusions:
- Crohn's disease pathology is directly linked to granuloma-induced lymphatic occlusion.
- The consequences of lymphatic obstruction explain the characteristic tissue changes in Crohn's disease.
- The findings support the long-standing view of Crohn's disease as a lymphatic vascular disorder.
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