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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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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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Introduction to Fibroblasts01:09

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Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
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Cells of the Adaptive Immune Response01:23

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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 Organs01:16

Primary Lymphoid Organs

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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.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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Secondary Lymphoid Organs01:15

Secondary Lymphoid Organs

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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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Related Experiment Video

Updated: Sep 5, 2025

Generation of Lymph Node-fat Pad Chimeras for the Study of Lymph Node Stromal Cell Origin
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Age-Associated Changes to Lymph Node Fibroblastic Reticular Cells.

Tina Kwok1, Shannon C Medovich1, Ildefonso A Silva-Junior1

  • 1Department of Immunology, Mayo Clinic, Scottsdale, AZ, United States.

Frontiers in Aging
|July 13, 2022
PubMed
Summary
This summary is machine-generated.

Aging impairs lymph node structure, increasing fibrosis and reducing naïve T cell numbers. This age-related fibrosis hinders T cell movement and survival, impacting immune responses.

Keywords:
T cell agingfibrosislive imaginglymph nodeslymphotoxinnaive T cellstwo-photon microscopy

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Last Updated: Sep 5, 2025

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Area of Science:

  • Immunology
  • Aging research
  • Cell biology

Background:

  • Naïve T cells are crucial for adaptive immunity, especially against new pathogens.
  • Aging leads to a decline in naïve T cells, compromising immune function.
  • Lymph node stroma provide essential survival signals for naïve T cells.

Purpose of the Study:

  • To investigate how aging alters lymph node stroma.
  • To determine if stromal changes contribute to reduced naïve T cell maintenance.
  • To elucidate the mechanisms behind age-related T cell decline.

Main Methods:

  • Utilized 2-photon microscopy to visualize aged lymph node architecture.
  • Assessed naïve T cell motility and homeostatic turnover in aged mice.
  • Examined the development of fibroblastic reticular cells and homeostatic factors.

Main Results:

  • Aged lymph nodes exhibit increased fibrosis, impairing naïve T cell motility.
  • Adoptively transferred young naïve T cells showed reduced survival in aged hosts.
  • Impaired fibroblastic reticular cell development correlated with lower homeostatic factors.

Conclusions:

  • Aging-induced lymph node fibrosis inhibits naïve T cell interactions and survival.
  • Impaired fibroblast differentiation contributes to reduced naïve T cell homeostasis.
  • These findings reveal a mechanism for age-related immune dysfunction.