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Mesenteric lymph node transplantation in syngeneic rats: changes in cellularity and architecture.
N F Liu1, J Maldik, W Olszewski
1Shanghai Institute of Plastic Surgery, Shanghai Second Medical University, China.
Lymphology
|September 1, 1992
Summary
Transplanted mesenteric lymph nodes in rats showed significant cellular depletion and loss of structure after afferent and efferent lymphatic interruption. This suggests interrupted lymph flow leads to functional involution of grafted lymph nodes.
Area of Science:
- Immunology
- Surgical Pathology
- Transplantation Biology
Background:
- Mesenteric lymph nodes are crucial for immune surveillance in the gastrointestinal tract.
- Lymphatic connections are essential for maintaining lymph node structure and function.
Purpose of the Study:
- To investigate the cellular and functional consequences of interrupting lymphatic supply to transplanted mesenteric lymph nodes.
- To understand the long-term effects of lymphatic deprivation on lymph node architecture and cellularity.
Main Methods:
- Rat mesenteric lymph nodes were transplanted with complete interruption of afferent and efferent lymphatic vessels.
- Cellular content, lymphocyte counts, and histological changes were assessed at various time points post-transplantation.
Main Results:
- Transplanted lymph nodes exhibited progressive depletion of cellular content, with lymphocyte counts dropping to 3.5% of controls.
- Mononuclear cell density decreased to 28% of normal, and high endothelial venules (HEV) flattened.
- Germinal centers and follicles disappeared, leading to loss of normal compartmentalization within three months.
Conclusions:
- Interruption of lymphatic drainage leads to severe histological and functional involution of transplanted mesenteric lymph nodes.
- The absence of circulating antigens and lymphocytes likely contributes to the observed degenerative changes.
- Successful engraftment and function of transplanted lymph nodes depend on re-establishment of lymphatic connections.