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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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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
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Formation of Human Thymus Organoids in Three-Dimensional Fibrin Hydrogels
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The origin and implication of thymic involution.

Danielle Aw1, Donald B Palmer

  • 1Royal Veterinary College, Infection and Immunity Group, Department of Veterinary Basic Sciences, Royal College Street, London NW1 0TU, United Kingdom.

Aging and Disease
|March 8, 2012
PubMed
Summary

Age-related thymic involution, or shrinkage, reduces T cell output, weakening immunity in older adults. This review explores factors driving thymic aging and its impact on immune function.

Keywords:
Thymic involutionThymic microenvironmentThymocytesThymus

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Area of Science:

  • Immunology
  • Aging Research
  • Cellular Biology

Background:

  • The thymus, crucial for T cell development, undergoes age-related regression (involution).
  • This involution leads to decreased naive T cell output and reduced T cell diversity.
  • Reduced T cell diversity is linked to increased susceptibility to infections, cancers, and autoimmune diseases in aging individuals.

Purpose of the Study:

  • To review the current understanding of thymic involution.
  • To assess the role of the thymic microenvironment in age-associated thymic involution.
  • To evaluate the functionality of thymocyte development in the aged thymus and explore the mechanisms behind thymic involution.

Main Methods:

  • Literature review and synthesis of existing research on thymic involution.
  • Analysis of factors, both extrinsic and intrinsic, implicated in age-associated thymic changes.
  • Assessment of thymocyte development and function within the aged thymic microenvironment.

Main Results:

  • Thymic involution is a significant aspect of immune system aging.
  • Emerging evidence suggests both extrinsic and intrinsic factors contribute to thymic involution.
  • The precise regulators of thymic involution remain under investigation.

Conclusions:

  • Understanding the regulators of thymic involution is critical for addressing age-related immune decline.
  • The thymic microenvironment is a potential key target for interventions.
  • Further research is needed to fully elucidate the mechanisms and functional consequences of thymic involution.