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Related Concept Videos

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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Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
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Development of the Lymphatic System01:15

Development of the Lymphatic System

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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.
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
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Secondary Lymphoid Organs01:15

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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.
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...
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Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

Role Of Notch Signalling In Intestinal Stem Cell Renewal

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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
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Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

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Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...
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Related Experiment Video

Updated: Dec 20, 2025

Author Spotlight: Advancing Thymic Epithelial Cells and T-Cell Research with Human Thymic Organoids
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Author Spotlight: Advancing Thymic Epithelial Cells and T-Cell Research with Human Thymic Organoids

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Postnatal Involution and Counter-Involution of the Thymus.

Jennifer E Cowan1, Yousuke Takahama2, Avinash Bhandoola1

  • 1Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States.

Frontiers in Immunology
|June 2, 2020
PubMed
Summary
This summary is machine-generated.

Thymus involution affects immune responses. Ectopic expression of cyclin D1 and Myc in thymic epithelial cells (TECs) significantly increases thymus size, offering insights into thymus regeneration strategies.

Keywords:
Mycagingcyclin D1growthinvolutionthymus

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Area of Science:

  • Immunology and developmental biology, focusing on thymus involution and regeneration.

Background:

  • Thymus involution, a natural aging process, impacts immune function in elderly individuals and post-transplant scenarios.
  • Understanding thymus size determinants is crucial for addressing age-related immune decline and transplantation outcomes.

Purpose of the Study:

  • To investigate the role of specific factors in thymus growth and size regulation.
  • To explore potential avenues for thymus regeneration through understanding thymic epithelial cell (TEC) controllers.

Main Methods:

  • Utilizing experimental models with ectopic expression of growth-promoting factors in TECs.
  • Analyzing the impact of cyclin D1 and Myc overexpression on thymus size.

Main Results:

  • Ectopic expression of cyclin D1 and Myc in TECs leads to a significant increase in thymus size.
  • These findings establish a link between specific gene expression and thymus organogenesis.

Conclusions:

  • Identifying TEC-specific growth controllers is key to understanding thymus development.
  • This research paves the way for novel strategies in thymus regeneration for therapeutic applications.