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Detailed Structure and Function of Lymph Nodes01:23

Detailed Structure and Function of Lymph Nodes

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Lymph nodes are bean-shaped structures that cluster along the lymphatic vessels in the inguinal, axillary, and cervical regions. Each node is divided into compartments by a capsule that extends trabeculae inward.
From a histological perspective, lymph nodes can be split into two main areas: the superficial cortex and the deep medulla. The outer cortex is populated by dendritic cells, macrophages, and B lymphocytes, which are densely packed into follicles. When these B-lymphocytes are presented...
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Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
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Leukocytes are classified into two groups based on the presence or absence of cytoplasmic granules. Granular leukocytes, which contain granules, belong to the myeloid lineage and are divided into three subtypes: neutrophils, eosinophils, and basophils. These cells are roughly spherical and characterized by the granules in their cytoplasm.
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An adult in good health typically has between 4,500 and 11,000 leukocytes, or white blood cells, per microliter of blood, which constitutes about 1% of the total blood volume. Unlike red blood cells, white blood cells contain a nucleus and other cellular organelles but do not have hemoglobin. Most white blood cells reside in connective tissues, particularly in lymphatic organs such as the lymph nodes, with only a small fraction present in circulating blood.
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Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
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Related Experiment Video

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Isolation of Murine Lymph Node Stromal Cells
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Published on: August 19, 2014

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Leukocyte-Stromal Interactions Within Lymph Nodes.

Joshua D'Rozario1,2, David Roberts2, Muath Suliman2

  • 1Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia.

Advances in Experimental Medicine and Biology
|August 30, 2018
PubMed
Summary
This summary is machine-generated.

Lymph nodes house diverse stromal cells that support immune cells like T cells and B cells. These cells are crucial for immune responses and preventing autoimmune diseases.

Keywords:
Endothelial cellsFRCsFibroblastsLECsLymph nodesLymphatic endotheliumLymphoid fibroblastsNon-haematopoieticPodoplaninStromal ImmunologyStromal cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Anatomy

Background:

  • Lymph nodes are critical sites for initiating adaptive immune responses.
  • Lymphocytes interact with antigens within the specialized microenvironment of lymph nodes.
  • Stromal cells form the structural and functional framework of lymph nodes.

Purpose of the Study:

  • To identify and characterize the major stromal cell subsets within lymph nodes.
  • To elucidate the functional roles of these stromal subsets in immune cell interactions.
  • To understand how stromal cells contribute to immune surveillance and self-tolerance.

Main Methods:

  • Histological analysis of lymph node architecture.
  • Immunohistochemistry to identify stromal cell markers.
  • Flow cytometry to quantify stromal cell populations.
  • In vitro co-culture experiments to study cell-cell interactions.

Main Results:

  • Detailed characterization of fibroblastic reticular cells, lymphatic and blood endothelial cells, marginal reticular cells, and follicular dendritic cells.
  • Identification of integrin alpha-7+ pericytes as a poorly defined stromal subset.
  • Demonstration of stromal cell-mediated support, migration, and tolerance induction for lymphocytes.
  • Specific interactions between stromal subsets and T cells, B cells, and dendritic cells were elucidated.

Conclusions:

  • Lymph node stromal cells are diverse and play essential roles in regulating immune responses.
  • Stromal cell subsets provide critical support for lymphocyte survival and function.
  • These interactions are vital for effective immune surveillance and the prevention of autoimmunity.