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Related Concept Videos

Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

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...
Tumor Immunotherapy01:27

Tumor Immunotherapy

Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

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Related Experiment Video

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An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma
07:01

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

Published on: April 17, 2013

Paraneoplastic diseases associated with thymoma.

Amelia Evoli1, Giacomo Maria Minicuci, Roberta Vitaliani

  • 1Dept. of Neurosciences, Catholic University, Largo F. Vito, 00168 Rome, Italy. a.evoli@rm.unicatt.it

Journal of Neurology
|February 28, 2007
PubMed
Summary

Thymoma is linked to various paraneoplastic diseases (PDs), not just myasthenia gravis (MG). Altered T cell maturation in thymomas may contribute to these autoimmune conditions.

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Area of Science:

  • Immunology
  • Oncology
  • Neurology

Background:

  • Thymoma frequently co-occurs with paraneoplastic diseases (PDs), most commonly myasthenia gravis (MG).
  • This association is hypothesized to stem from thymoma's role in T lymphocyte production and export.

Purpose of the Study:

  • To determine the incidence and characteristics of PDs associated with thymoma, excluding MG.
  • To assess T cell maturation within thymomas, comparing cases with and without PDs.

Main Methods:

  • Studied 260 thymoma patients, 228 with MG.
  • Monitored PD occurrence and tumor outcomes.
  • Performed flow cytometry on thymoma samples from 14 patients (7 with MG, 7 without) to characterize thymocyte subsets.

Main Results:

  • 15.8% of patients (41/260) had 47 PDs. Neurological PDs included neuromyotonia and limbic encephalitis; non-neurological PDs were predominantly hematological and cutaneous.
  • PD onset, similar to MG, could precede or follow thymomectomy and sometimes indicated tumor recurrence.
  • Thymomas from MG patients showed more mature CD4 single positive (SP) thymocytes and fewer CD4SPCD25(+) cells, suggesting potential issues with T regulatory cell generation or T cell activation.

Conclusions:

  • Thymoma is strongly associated with a diverse range of PDs, similar in course to MG.
  • Alterations in intratumoral mature CD4(+) T cell production in thymomas may play a role in the development of paraneoplastic autoimmunity.