Objective: To study effect of excessive iodine exposure on the serum TC and TG level in rate.
Methods: According to body weight, 60 Wistar rats were divided into 6 groups and given drinking water including different doses of iodine. The iodine concentrations were 0 (control), 1800, 3600, 7200, 14000 and 28000 microg/L, respectively. Three months later, related indices were determined.
Results: In excessive iodine groups, no obvious changes of thyroid morphology was observed. Urinary iodine level increased dose-dependently. Excessive iodine intake resulted in a significant reduce of serum TT4 level and an obvious increase of serum TC level in a dose-dependent manner. The positive correlation was observed between serum TC and urinary iodine. There was the negative correlation between serum TC and serum T4.
Conclusion: Excessive-iodine exposure resulted in an increase in serum TC level. And serum lipids, together with urinary iodine and serum thyroid hormones, could be used as biomarkers for excessive iodine exposure.