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Chronic inflammation caused by lymphotoxin is lymphoid neogenesis
A Kratz1, A Campos-Neto, M S Hanson
1Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut 06520-8034, USA.
The Journal of Experimental Medicine
|April 1, 1996
Summary
Lymphotoxin (LT) drives chronic inflammation and lymphoid organogenesis. LT-induced lesions in mice mimic lymph nodes, demonstrating organized lymphoid tissue characteristics.
Area of Science:
- Immunology
- Molecular Biology
- Pathology
Background:
- Chronic inflammation and lymphoid organogenesis are complex processes.
- Lymphotoxin (LT, also known as LT-alpha or TNF-beta) is implicated in immune responses.
Purpose of the Study:
- To investigate the unifying role of lymphotoxin in chronic inflammation and lymphoid organogenesis.
- To characterize the features of LT-induced inflammatory lesions.
Main Methods:
- Utilized transgenic mice expressing LT under the rat insulin promoter (RIP-LT).
- Analyzed kidney and pancreas inflammatory lesions for cellular composition, tissue architecture, and vascular features.
- Assessed the functional capacity of lesions, including antigen response and Ig class switching.
Main Results:
- RIP-LT mice developed chronic inflammatory lesions resembling lymph nodes.
- Lesions exhibited characteristic lymphoid structures, including T and B cell areas and follicles.
- Vascular changes, such as high endothelial venules (HEVs) with specific adhesion molecules, were observed.
- LT-induced inflammation showed functional lymphoid capabilities, including antigen response and Ig class switching.
Conclusions:
- Lymphotoxin plays a pivotal and similar role in both chronic inflammation and lymphoid organogenesis.
- LT-induced chronic inflammation creates organized lymphoid tissue structures.
- Transgene-derived LT expression directly influences vascular changes associated with lymphoid tissue formation.