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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Metformin affects thyroid function in male rats.

Xiaowen Hu1, Yang Liu2, Changmei Wang3

  • 1Department of Infectious Diseases, Jinan Central Hospital Affiliated to Shandong University, Jinan 250013, China.

Oncotarget
|January 4, 2018
PubMed
Summary
This summary is machine-generated.

Metformin therapy can alter thyroid function, causing symptoms of hyperthyroidism. This study in rats shows metformin affects thyroid hormones and thyrotropin, suggesting potential clinical interference.

Keywords:
free thyroxinefree triiodothyroninemetforminthyrotropintype 2 diabetes

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Area of Science:

  • Endocrinology
  • Pharmacology
  • Metabolic Diseases

Background:

  • Metformin is a common type 2 diabetes drug.
  • Recent research suggests metformin may impact thyroid function.
  • Thyroid and metabolic disorders often coexist.

Purpose of the Study:

  • To investigate the effects of metformin on thyroid function and morphology in a rat model.
  • To evaluate external symptoms and biochemical markers of thyroid function in rats treated with metformin.

Main Methods:

  • Male Wistar rats were divided into four groups: control, diabetic, metformin-treated, and diabetic metformin-treated.
  • External symptoms, food intake, and body weight were monitored.
  • Serum levels of thyrotropin (TSH), free triiodothyronine (FT3), and free thyroxine (FT4) were measured.

Main Results:

  • Metformin treatment led to increased FT3 and FT4 levels and decreased TSH, regardless of diabetes status.
  • Diabetic rats treated with metformin showed symptoms like irritability and diarrhea.
  • Metformin alone increased FT3 and FT4, and decreased TSH, suggesting a hyperthyroid state.

Conclusions:

  • Metformin can induce changes in thyroid function, including elevated FT3 and FT4 and suppressed TSH, in male rats.
  • These thyroid alterations are associated with clinical symptoms resembling hyperthyroidism.
  • Clinicians should consider metformin's potential to interfere with thyroid function during treatment.