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Related Concept Videos

Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
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The development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
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Liver Regeneration01:24

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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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Detailed Structure and Function of Lymph Nodes01:23

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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.
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The microscopic anatomy of the liver is a complex and intricate system that comprises numerous structural units known as liver lobules, each of which is comparable in size to a sesame seed. These hexagonal structures consist of plates of liver cells or hepatocytes, which are characterized by their versatility and abundance of cellular apparatus like rough and smooth ER, Golgi apparatus, peroxisomes, and mitochondria.
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Isolation of Human Lymphatic Endothelial Cells by Multi-parameter Fluorescence-activated Cell Sorting
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Fat-associated lymphoid clusters as expandable niches for ectopic liver development.

Bing Han1, Maria Giovanna Francipane1,2, Amin Cheikhi1

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Intraperitoneal injection of hepatocytes leads to ectopic liver regeneration in fat-associated lymphoid clusters (FALCs). These ectopic livers compensate for native liver function, offering a promising alternative for treating liver failure.

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Area of Science:

  • Hepatology
  • Immunology
  • Regenerative Medicine

Background:

  • Hepatocyte transplantation is a promising alternative to whole-organ transplantation.
  • Intraportal and intrasplenic routes are common but risky in patients with severe liver disease.
  • Intraperitoneal (i.p.) injection offers a less invasive alternative, with lymph nodes identified as potential extrahepatic engraftment sites.

Purpose of the Study:

  • To investigate extrahepatic niches for hepatocyte engraftment after i.p. injection.
  • To determine if other abdominal niches support transplanted hepatocyte survival and proliferation.
  • To explore the potential of these niches for ectopic liver regeneration.

Main Methods:

  • Hepatocytes were transplanted into mice via i.p. injection.
  • Ectopic liver tissue formation was analyzed in fat-associated lymphoid clusters (FALCs).
  • Transcriptome analysis compared ectopic and native liver gene expression.
  • FALC formation was manipulated through bone marrow transplantation and induced inflammation.

Main Results:

  • Hepatocytes transplanted via i.p. injection engrafted and formed functional ectopic livers within FALCs.
  • Ectopic livers exhibited compensatory gene expression, functionally integrating with the native liver.
  • FALC presence was crucial for ectopic liver development; bone marrow transplantation restored it in immunodeficient mice.
  • Increased FALCs via inflammation improved engraftment and accelerated recovery in a mouse model of liver failure.

Conclusions:

  • Abdominal FALCs are essential extrahepatic sites for hepatocyte engraftment following i.p. transplantation.
  • FALCs provide an accessible and expandable niche for ectopic liver regeneration.
  • Adequate growth stimulus is key for enhancing FALC-mediated ectopic liver regeneration.