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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.
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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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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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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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Generation of Lymph Node-fat Pad Chimeras for the Study of Lymph Node Stromal Cell Origin
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Tertiary Lymphoid Structures: Diversity in Their Development, Composition, and Role.

Catarina Gago da Graça1, Lisa G M van Baarsen2,3,4, Reina E Mebius5

  • 1Department of Molecular Cell Biology and Immunology, Amsterdam Infection and Immunity Institute, Amsterdam University Medical Center, Vrije Universiteit, 1081HZ Amsterdam, the Netherlands.

Journal of Immunology (Baltimore, Md. : 1950)
|January 5, 2021
PubMed
Summary
This summary is machine-generated.

Lymph node stromal cells and tertiary lymphoid structures (TLSs) are key regulators of immune responses. This review covers their formation, function, and roles in autoimmunity and cancer, highlighting their potential in immune tolerance.

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Area of Science:

  • Immunology
  • Cell Biology
  • Pathology

Background:

  • Lymph node stromal cells provide structural and soluble support for adaptive immunity, facilitating antigen encounter.
  • Fibroblasts in inflamed tissues can develop lymphoid-stroma properties, forming tertiary lymphoid structures (TLSs).
  • Mature TLSs are functional immune sites impacting autoimmunity and cancer.

Purpose of the Study:

  • To review recent findings on the function and formation of lymph node stromal cells.
  • To explore the role and formation of tertiary lymphoid structures (TLSs).
  • To describe the involvement of these structures in disease, particularly in immune tolerance.

Main Methods:

  • Literature review of recent scientific findings.
  • Synthesis of information on stromal cell and TLS biology.
  • Analysis of their roles in pathological conditions and immune tolerance.

Main Results:

  • Stromal cells are crucial for immune cell regulation and organization within lymphoid organs.
  • Tertiary lymphoid structures (TLSs) emerge in inflamed tissues, mimicking secondary lymphoid organs.
  • TLSs are implicated in both the progression of autoimmune diseases and cancer, and potentially in inducing tolerance.

Conclusions:

  • Understanding lymph node stromal cells and TLSs is vital for comprehending immune responses in health and disease.
  • TLSs represent significant functional sites that can influence autoimmune and neoplastic conditions.
  • Further research into TLSs may offer novel therapeutic strategies, particularly for modulating immune tolerance.