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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.
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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.
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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Appraising the causal relationship between thyroid function and rheumatoid arthritis: a two-sample bidirectional

Peng Gu1,2, Bin Pu1,2, YangCheng Ma2

  • 1The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, China.

Frontiers in Immunology
|December 13, 2023
PubMed
Summary

This study found that thyroid dysfunction and rheumatoid arthritis (RA) have a bidirectional causal relationship. Genetic susceptibility to hypothyroidism increases RA risk, and RA increases the risk of hypothyroidism and hyperthyroidism.

Keywords:
Mendelian randomizationfree thyroxinehyperthyroidismhypothyroidismrheumatoid arthritisthyroid-stimulating hormone

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Area of Science:

  • Genetics
  • Endocrinology
  • Rheumatology

Background:

  • Observational studies suggest a link between thyroid dysfunction and rheumatoid arthritis (RA), but causality remains uncertain.
  • Understanding the causal relationship is crucial for developing effective prevention and treatment strategies.

Purpose of the Study:

  • To investigate the causal relationship between thyroid function and rheumatoid arthritis (RA) using a bidirectional Mendelian Randomization (MR) approach.
  • To determine if genetic predisposition to thyroid disorders influences RA risk, and vice versa.

Main Methods:

  • A two-sample bidirectional Mendelian Randomization (MR) study was conducted.
  • Genetic variants associated with hypothyroidism, hyperthyroidism (including Graves' disease), free thyroxine (FT4), and thyroid-stimulating hormone (TSH) were used as exposures.
  • Rheumatoid arthritis (RA) was used as the outcome in the forward analysis, and RA was the exposure in the reverse analysis.

Main Results:

  • Genetic susceptibility to hypothyroidism was associated with an increased risk of RA.
  • Genetic susceptibility to RA was associated with an increased risk of hypothyroidism, Graves' disease, and other hyperthyroid conditions.
  • No significant causal relationship was found between RA and free thyroxine (FT4) or thyroid-stimulating hormone (TSH) levels.

Conclusions:

  • The study provides genetic evidence supporting a bidirectional causal relationship between thyroid function and RA.
  • These findings highlight the interconnectedness of thyroid health and RA, informing potential therapeutic targets and preventive measures.