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Related Experiment Videos

Microvascular changes in lymph nodes draining skin allografts.

N D Anderson, A O Anderson, R G Wyllie

    The American Journal of Pathology
    |October 1, 1975
    PubMed
    Summary

    Skin allograft triggers lymphocyte trapping in lymph nodes, altering microvasculature and cell traffic. Activated endothelial cells in high endothelial venules contribute to this immune response.

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    Spatial and molecular organization of lymph node T cell cortex: a labyrinthine cavity bounded by an epithelium-like monolayer of fibroblastic reticular cells anchored to basement membrane-like extracellular matrix.

    International immunology·2001

    Area of Science:

    • Immunology
    • Vascular Biology
    • Histology

    Background:

    • Regional lymph nodes play a crucial role in immune responses to foreign antigens.
    • Understanding microvascular changes in lymph nodes is key to deciphering immune cell trafficking.

    Purpose of the Study:

    • To characterize the microvasculature of regional lymph nodes draining skin allograft sites.
    • To investigate alterations in lymphocyte traffic and endothelial cell activity post-transplantation.

    Main Methods:

    • Histological, histochemical, ultrastructural, and radiolabeling techniques were employed.
    • Analysis of lymph node microvasculature at various time points after skin grafting.

    Main Results:

    • Increased vascular permeability and altered lymphocyte traffic observed 12-48 hours post-grafting.
    • Evidence of "lymphocyte trapping" due to increased entry and decreased egress.
    • Redistribution of cortical capillaries and proliferation of high endothelial venules (HEVs).
    • Activated HEVs showed increased basophilia, acid hydrolase activity, and phagocytosis of microthrombi.

    Conclusions:

    • Skin allografts induce significant changes in lymph node microvasculature and lymphocyte dynamics.
    • Activated endothelial cells in HEVs are integral to the immune response and lymphocyte trapping.
    • Microvascular remodeling and HEV activation are critical for mounting an immune response to allografts.

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