Journal of the Endocrine Society Journal Article

Thyroid Function and Oral Microbiome Diversity

November 14, 2023
 

Liang Zheng, Rui Yang, Ruixia Li, Wanna Chen, Jing Zhang, Weiming Lv, Bo Lin, Jiajun Luo
Journal of the Endocrine Society, Volume 7, Issue 11, November 2023, bvad125
https://doi.org/10.1210/jendso/bvad125

Abstract

Objective

To investigate the association between thyroid functions and the oral microbiome diversity.

Method

Data from the US National Health and Nutrition Examination Survey (NHANES; 2009–2012) were analyzed. Thyroid functions were defined using thyroid hormones and related biomarkers. Oral microbiome was measured using the observed number of amplicon sequence variants (ASVs) and the Bray-Curtis dissimilarity. Linear regression was used to estimate the average change (β) and 95% CI for the number of ASVs against thyroid functions, adjusted for sociodemographic variables, health conditions, urinary iodine status, and periodontitis. Non-metric multidimensional scaling (NMDS) was used to analyze the Bray-Curtis dissimilarity.

Results

A total of 2943 participants were analyzed. The observed number of ASVs has a weighted mean of 128.9. Self-reported thyroid disease was associated with reduced number of ASVs (β = −9.2, 95% CI: −17.2, −1.2), if only adjusted for sociodemographic variables and health conditions. In the fully adjusted model, compared to normal thyroid function, both subclinical and clinical hyperthyroidism were associated with reduced number of ASVs (β = −59.6, 95% CI: −73.2, −46.0; β = −28.2, 95% CI: −50.0, −6.5, respectively). Thyroid peroxidase antibody level higher than the reference range was associated with higher observed ASV (β= 9.0, 95% CI: 1.2, 16.9). NMDS analysis suggested significant difference in oral microbiome composition between free triiodothyronine groups (P = .002), between free thyroxine groups (P = .015), and between thyroglobulin groups (P = .035).

Conclusion

Hyperthyroidism was associated with reduced oral microbiome diversity. Free triiodothyronine, free thyroxine, and thyroglobulin levels may alter the oral microbiome composition.

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