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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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Development of Immunocompetence01:22

Development of Immunocompetence

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 System

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...
The Thyroid Gland01:23

The Thyroid Gland

The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth 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...

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Formation of Human Thymus Organoids in Three-Dimensional Fibrin Hydrogels
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The normal human newborns thymus.

V Jablonska-Mestanova1, V Sisovsky, L Danisovic

  • 1Comenius University, Bratislava, Slovakia.

Bratislavske Lekarske Listy
|July 5, 2013
PubMed
Summary
This summary is machine-generated.

This study maps the cellular composition of the newborn thymus microenvironment, detailing the locations of epithelial cells, immune cells, and apoptosis-regulating proteins. Findings reveal specific distributions crucial for T cell development in infants undergoing cardiac surgery.

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Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus
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Area of Science:

  • Immunology
  • Cell Biology
  • Histology

Background:

  • The thymic microenvironment is essential for T lymphocyte development, involving thymic epithelial cells and accessory cells.
  • Thymus histology varies with age and external stimuli.
  • Newborn thymuses from infants with congenital heart defects provide a unique model for studying early development.

Purpose of the Study:

  • To precisely map the cellular architecture of the newborn thymus microenvironment.
  • To investigate the localization of key cell types and apoptosis-regulating proteins.
  • To understand the histological features of the thymus in infants with congenital heart defects.

Main Methods:

  • Utilized seven monoclonal antibodies for cell localization (cytokeratin AE1/AE3, desmin, actin, S100, CD68, CD20, CD45RO).
  • Employed three monoclonal antibodies targeting apoptosis regulators (bcl2, p53, survivin).
  • Examined thymuses from fourteen newborn infants undergoing cardiac surgery.

Main Results:

  • Detailed the distribution of epithelial cells, dendritic cells, myoid cells, macrophages, B lymphocytes (CD20+), and T lymphocytes (CD45RO+).
  • Identified p53 expression in subcapsular cortex and Hassall's corpuscles epithelial cells.
  • Observed bcl2-positive lymphocytes predominantly in the medulla and mostly survivin-negative thymuses.

Conclusions:

  • Established a detailed cellular map of the newborn thymus microenvironment.
  • Provided insights into the expression patterns of apoptosis-related proteins during early T cell development.
  • Highlighted the potential impact of congenital heart defects on thymic histology and cellular composition.