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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.
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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...
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Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
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Related Experiment Video

Updated: May 11, 2026

Isolation and Transplantation of Different Aged Murine Thymic Grafts.
05:47

Isolation and Transplantation of Different Aged Murine Thymic Grafts.

Published on: May 13, 2015

Trafficking to the thymus.

Shirley L Zhang1, Avinash Bhandoola

  • 1Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, 264 John Morgan Building 3620 Hamilton Walk, Philadelphia, PA, USA.

Current Topics in Microbiology and Immunology
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

Hematopoietic progenitors migrate from bone marrow to the thymus for T lymphocyte production. Molecular signals like selectin ligands regulate this critical thymic settling process for T cell regeneration.

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Last Updated: May 11, 2026

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Area of Science:

  • Immunology
  • Developmental Biology
  • Hematopoiesis

Background:

  • T lymphocyte production relies on hematopoietic progenitors migrating from bone marrow to the thymus.
  • Progenitor cell egress from bone marrow into circulation and subsequent homing to the thymus are essential for T cell development.
  • Thymic settling is a complex process regulated by specific molecular interactions.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing hematopoietic progenitor cell migration to the thymus.
  • To identify key regulators of thymic settling for specific progenitor populations.
  • To explore therapeutic potential for T cell regeneration by understanding progenitor cell trafficking.

Main Methods:

  • Analysis of molecular signals including selectin ligands, chemokine receptors, and integrins.
  • Identification of specific hematopoietic progenitor populations capable of thymic homing.
  • Investigating the molecular basis of progenitor cell migration and retention in the thymus.

Main Results:

  • Identification of critical molecular players (selectin ligands, chemokine receptors, integrins) regulating thymic settling.
  • Characterization of specific hematopoietic progenitor subsets that successfully home to the thymus.
  • Progress in understanding the molecular mechanisms underlying progenitor cell trafficking to the thymus.

Conclusions:

  • Thymic settling of hematopoietic progenitors is a tightly regulated process involving specific molecular cues.
  • Understanding these mechanisms allows for the identification of progenitor populations crucial for T cell development.
  • Targeting these pathways offers potential for therapeutic strategies to enhance T cell regeneration.