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Related Concept Videos

Primary Lymphoid Organs01:16

Primary Lymphoid Organs

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...
Secondary Lymphoid Organs01:15

Secondary Lymphoid Organs

Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

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...
Functions of the Lymphatic and Immune System01:28

Functions of the Lymphatic and Immune System

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.
The primary lymphoid organs, including the bone marrow and the thymus, serve as the maturation sites for lymphocytes. Secondary lymphoid organs, like the mucosa-associated lymphoid tissue, activate these lymphocytes and serve as...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...

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Updated: May 22, 2026

Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
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Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood

Published on: April 16, 2012

Changes in primary lymphoid organs with aging.

Ivan K Chinn1, Clare C Blackburn, Nancy R Manley

  • 1Department of Pediatrics, Duke University Medical Center, Durham, NC 27710, USA.

Seminars in Immunology
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

Immune senescence in aging adults stems from bone marrow and thymus changes, reducing B and T lymphocyte production. Understanding these mechanisms may lead to interventions restoring immune function in the elderly.

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Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
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Published on: April 16, 2012

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09:10

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Published on: December 16, 2013

Area of Science:

  • Immunology
  • Gerontology
  • Cell Biology

Background:

  • Aging is linked to diminished immune function, increasing illness and death rates in older adults.
  • Immune senescence involves age-related alterations in primary lymphoid organs: bone marrow and thymus.
  • This leads to reduced production and impaired function of B and T lymphocytes.

Purpose of the Study:

  • To explore the mechanisms driving immune senescence in aging.
  • To investigate age-related changes in bone marrow and thymus function.
  • To identify potential targets for interventions to restore immune function in the elderly.

Main Methods:

  • Review of current literature on aging, immune senescence, bone marrow, and thymus.
  • Analysis of cellular and molecular changes in lymphoid organs with age.
  • Examination of factors contributing to thymic involution and bone marrow dysfunction.

Main Results:

  • Bone marrow hematopoietic stem cells show reduced self-renewal, increased myelopoiesis, and decreased lymphocyte production.
  • Aging bone marrow is affected by oxidative stress, inflammation, adipocyte differentiation, and disrupted niches.
  • Thymic involution involves architectural disorganization, increased adiposity, and loss of stroma-thymocyte cross-talk, reducing naive T cell export.

Conclusions:

  • Thymic inflammation, systemic stress, altered gene expression (Foxn1, KGF), and sex steroids drive thymic involution and immune senescence.
  • Understanding these pathways is crucial for developing interventions to combat age-related immune decline.
  • Targeting bone marrow and thymus changes offers potential for restoring immune competence in aging populations.