Thyroid Function and Brain Structure: Insight from a Mendelian Randomization Study

doi:10.1159/000542955

2024-12-09

PRE

DOI：10.1159/000542955

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Introduction: Thyroid hormones play a critical role in brain development. However, the precise causal associations between thyroid function and structural changes in specific brain regions remain uncertain. Methods: We applied the univariate Mendelian randomization (UVMR) method to assess the causal effects of thyroid function on brain structure. Genome-wide association study (GWAS) data on thyroid-related traits from the ThyroidOmics Consortium including free thyroxine (FT4), free tri-iodothyronine (FT3), thyroid-stimulating hormone (TSH), FT3/FT4 ratio, as well as dichotomized high and low TSH levels were used as exposures. GWAS data on cortical thickness, surface area, and volume of subcortical structures served as outcomes. Inverse variance weighted was the main estimate method. Subsequently, multivariable MR (MVMR) was conducted to validate significant causal associations identified in UVMR. Results: UVMR analysis demonstrated a statistically significant inverse association between genetically predicted FT4 and putamen volume (beta = -71.91 mm(3), 95% confidence interval: -112.11 mm(3) to -31.71 mm(3), p = 4.54 x 10(-4)). The findings were robust in sensitivity analysis. MVMR analysis further confirmed a persistent causal relationship between FT4 and putamen volume after adjusting for FT3, TSH, and neuropsychiatric disorders. Functional enrichment analyses indicated the pathways by which FT4 influences putamen volume may be related to the thyroid hormone signaling pathway, sodium-independent organic anion transport, and Rap1 signaling pathway. Conclusion: MR analysis provides evidence for causal relationships between thyroid function and brain structural alterations, particularly highlighting the impact of FT4 on putamen volume. Further research is warranted to elucidate the underlying mechanisms by which thyroid hormones modulate brain structure.

Keyword:

Thyroid function

Free thyroxine

Brain structure

Mendelian randomization

期刊

Neuroendocrinology

IF:

2.8

论文数:

2.4K

被引数:

5.1K

机构

Capital Medical University

学者数:

5.3W

论文数: 3.3W

被引数: 3.2W

nanjing university

学者数:

7.8W

论文数: 5.6W

被引数: 87

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