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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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Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
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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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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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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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Isolation of Murine Lymph Node Stromal Cells
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The lymph node stromal laminin α5 shapes alloimmunity.

Lushen Li1,2, Marina W Shirkey1,2, Tianshu Zhang1,2

  • 1Department of Surgery, and.

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Stromal laminin α5 (Lama5) in lymph nodes controls T cell entry and differentiation. Targeting this pathway promotes immune tolerance and allograft acceptance by modulating T cell behavior.

Keywords:
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Area of Science:

  • Immunology
  • Cell Biology
  • Tissue Engineering

Background:

  • Lymph node stromal cells (LNSCs) are crucial for immune regulation by creating lymphocyte niches.
  • Laminin α5 (Lama5), produced by LNSCs, influences CD4+ T cell function, but mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the mechanisms by which LNSC-derived Lama5 regulates T cell behavior and immune responses.
  • To investigate the potential of targeting the Lama5 axis for immune tolerance induction.

Main Methods:

  • Lama5 depletion in LNSCs using genetic models.
  • Analysis of lymph node structure, chemokine and adhesion molecule expression.
  • Assessment of T cell transendothelial migration and entry into lymph nodes.
  • Evaluation of T cell activation, differentiation, and allograft rejection in vivo.

Main Results:

  • Lama5 depletion altered lymph node structure, increasing high endothelial venules (HEVs) and upregulating immune mediators.
  • Lama5 suppressed T cell migration via α6 integrin and α-dystroglycan receptors.
  • Depletion of Lama5 promoted regulatory T cell phenotypes and enhanced allograft acceptance.

Conclusions:

  • Stromal Lama5 critically regulates immune responses by modulating lymph node architecture and T cell behavior.
  • The identified stromal Lama5-T cell receptor axis represents a potential therapeutic target for immune tolerance modulation.