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Related Experiment Video

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Causal relationship between thyroid function and multiple sclerosis: A bidirectional Mendelian randomization study.

Wenhui Cui1, Bin Wang2, Keqing Shi1

  • 1College of Public Health, Shandong Second Medical University, Shandong, China.

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This study found a causal link between thyroid-stimulating hormone (TSH) and multiple sclerosis (MS). Higher TSH levels may increase the risk of developing MS, suggesting a potential role for thyroid function in MS etiology.

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Area of Science:

  • Neuroimmunology
  • Endocrinology
  • Genetic Epidemiology

Background:

  • Observational studies suggest a link between thyroid function and multiple sclerosis (MS).
  • The causal relationship between thyroid function and MS remains unclear.
  • Mendelian randomization (MR) can help elucidate causal links using genetic variants.

Purpose of the Study:

  • To investigate the bidirectional causal relationship between thyroid function and MS using MR.
  • To assess the causal effect of thyroid-stimulating hormone (TSH), free thyroxine (FT4), hypothyroidism, and hyperthyroidism on MS risk.
  • To examine the potential causal effect of MS on thyroid function parameters.

Main Methods:

  • Bidirectional Mendelian randomization (MR) analysis.
  • Utilized genome-wide association study (GWAS) data from large consortia (ThyroidOmics, FinnGen).
  • Employed inverse-variance weighted (IVW) as the primary method, with sensitivity analyses including MR-Egger and heterogeneity/pleiotropy tests.

Main Results:

  • A significant positive causal relationship was found between thyroid-stimulating hormone (TSH) and multiple sclerosis (MS) (IVW: OR=1.202, P=0.013).
  • No significant causal effects were observed for free thyroxine (FT4), hypothyroidism, or hyperthyroidism on MS risk.
  • Reverse MR analyses showed no significant causal relationship between MS and the studied thyroid function parameters.

Conclusions:

  • Mendelian randomization analysis supports a positive causal relationship between elevated TSH levels and an increased risk of MS.
  • Thyroid function, particularly TSH, may play a causal role in the development of multiple sclerosis.
  • Further research is warranted to explore the underlying mechanisms connecting TSH and MS pathogenesis.