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Related Experiment Video

Updated: Jun 4, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Marginal iodide deficiency and thyroid function: dose-response analysis for quantitative pharmacokinetic modeling.

M E Gilbert¹, E D McLanahan, J Hedge

¹Toxicity Assessment Division (MD-B105-05), National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, 109 TW Alexander Drive, Research Triangle Park, NC 27711, USA. gilbert.mary@epa.gov

|February 15, 2011

Summary

This summary is machine-generated.

Marginal iodine deficiency (ID) impacts thyroid hormones, with rats showing resilience to low iodine intake. This study provides data for quantitative models of iodine deficiency during pregnancy and lactation.

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In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

Published on: October 6, 2023

Area of Science:

Endocrinology
Nutritional Science
Toxicology

Background:

Severe iodine deficiency (ID) is linked to developmental hypothyroidism, but marginal ID effects are less understood.
Thyroid hormones are crucial for development, and their regulation is sensitive to iodine availability.
Quantitative models are needed to predict the health impacts of varying iodine intake levels.

Purpose of the Study:

To investigate the dose-response relationship between graded iodine intake and thyroid function in rats.
To gather parametric data for developing a quantitative biologically based dose-response (BBDR) model of the thyroid axis.
To compare experimental findings with existing BBDR model predictions for iodine deficiency.

Main Methods:

Female Long Evans rats were fed diets with iodine concentrations ranging from excess to deficient for 8 weeks.
Food intake, body weight, and urinary iodide excretion were monitored.
Serum thyroid hormones (T4, T3, TSH), thyroid weight, and thyroid iodine content were analyzed.

Main Results:

Serum thyroxine (T4) levels decreased dose-dependently with lower iodine intake.
Thyroid weight increased, while thyroidal and urinary iodide content decreased as dietary iodine reduced.
Rats exhibited greater resilience to low iodine intake than predicted by current BBDR models.

Conclusions:

Graded iodine intake affects thyroid hormone levels and iodine storage in rats.
Existing quantitative models may overestimate the impact of marginal iodine deficiency in certain populations.
Further refinement of BBDR models is necessary, incorporating data from this study for improved predictions during pregnancy and lactation.