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Lymph-borne dendritic leucocytes do not recirculate, but enter the lymph node paracortex to become interdigitating
1Institute of Anatomy, University of Oslo, Norway.
Scandinavian Journal of Immunology
|January 1, 1988
Summary
Peripheral lymph dendritic leukocytes (DL) are believed to be precursors to interdigitating cells (IDC). This study tracked reinjected DL, finding they mature into IDC in lymph nodes and spleen, confirming their precursor role.
Area of Science:
- Immunology
- Cell Biology
- Lymphatic System Research
Background:
- Peripheral lymph contains major histocompatibility complex (MHC) class II-positive dendritic leukocytes (DL) with veiled (VC) or dendritic (DC) shapes.
- These cells are phenotypically similar to interdigitating cells (IDC) found in lymphoid tissues, suggesting they may be IDC precursors.
Purpose of the Study:
- To determine the relationship between peripheral lymph VC/DC and mature IDC.
- To investigate the in vivo development and localization of peripheral lymph DL.
Main Methods:
- Purified, radiolabeled peripheral lymph DL from nude rats were reinjected intravenously or into footpads.
- Host tissues and lymph were collected for scintillation counting and autoradiography.
- Light and electron microscopy were used to examine cell morphology.
Main Results:
- Intravenously injected DL localized primarily in the liver and spleen, with some migrating to coeliac lymph nodes via lymphatics.
- Locally injected DL traveled to draining popliteal lymph nodes via peripheral lymph, while most remained in the footpads.
- In the spleen and lymph nodes, DL acquired the morphology of mature IDC.
Conclusions:
- Peripheral lymph DL are indeed precursors that mature into IDC within lymphoid organs like the spleen and lymph nodes.
- This study provides evidence for the migratory and differentiation pathways of these crucial immune cells.