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Related Concept Videos

Autoimmune Disorders01:29

Autoimmune Disorders

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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune...
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Synthesis and Regulation of Thyroid Hormones01:20

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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...
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Immune Response Against Viral Pathogens01:29

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
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Myocarditis I: Introduction01:21

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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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...
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The Thyroid Gland01:23

The Thyroid Gland

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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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COVID-19-induced autoimmune thyroiditis: Exploring molecular mechanisms.

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  • 1Department of Immunology, Mashhad University of Medical Sciences, Mashhad, Iran.

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Area of Science:

  • Immunology
  • Endocrinology
  • Virology

Background:

  • Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) affects multiple organs, including the thyroid, through direct invasion or inflammation.
  • Immune system dysregulation during SARS-CoV-2 infection can shift responses, potentially leading to autoimmune conditions.
  • Increased incidence of autoimmune thyroid diseases (AITDs) such as subacute thyroiditis, Graves' disease, and Hashimoto's thyroiditis observed in COVID-19 patients.

Purpose of the Study:

  • To explore the immune mechanisms linking SARS-CoV-2 infection to the development of autoimmune thyroid diseases.
  • To understand how aberrant immune responses contribute to AITD pathogenesis post-COVID-19.
  • To identify potential therapeutic targets for managing AITDs in the context of SARS-CoV-2 infection.

Main Methods:

  • Review of immunological factors including T-cell subtypes, autoantibodies, and regulatory cell function.
  • Analysis of inflammatory cytokine profiles, such as IL-6, IL-1β, IFN-γ, and TNF-α.
  • Correlation of COVID-19 infection with the onset and progression of AITDs.

Main Results:

  • SARS-CoV-2 infection is associated with increased risk of developing autoimmune thyroid diseases.
  • Aberrant T-cell responses, autoantibody production, and impaired regulatory cells contribute to AITD development.
  • Elevated levels of pro-inflammatory cytokines (IL-6, IL-1β, IFN-γ, TNF-α) are implicated in AITD pathogenesis following SARS-CoV-2 infection.

Conclusions:

  • COVID-19 infection can precipitate or exacerbate autoimmune thyroid diseases through complex immune system alterations.
  • Understanding these immune responses is crucial for developing effective treatments for AITDs in post-COVID-19 patients.
  • Targeting specific immune pathways may offer novel therapeutic strategies for mitigating AITD progression.