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Mol Nutr Food Res. 2018 Mar;62(6):e1700599. doi: 10.1002/mnfr.201700599. Epub 2018 Feb 28.

A High-Fat Diet Rich in Saturated and Mono-Unsaturated Fatty Acids Induces Disturbance of Thyroid Lipid Profile and Hypothyroxinemia in Male Rats.

Zhang X1,2,3, Chen W4, Shao S1,2,3, Xu G5, Song Y1,2,3, Xu C1,2,3, Gao L2,3,4, Hu C5, Zhao J1,2,3.

Author information

1
Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Ji-nan, China.
2
Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, China.
3
Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, China.
4
Scientific Center, Shandong Provincial Hospital affiliated to Shandong University, Ji-nan, China.
5
CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.

Abstract

SCOPE:

Increasing evidence has shown that the disturbance of lipid metabolism might make a possible contribution to the pathogenesis of organ dysfunction, including thyroid, yet it is unknown whether excess intake of dietary fat interferes in thyroid lipid profile. We investigate the effects of dietary fat toward the thyroid lipid profile and thyroid function.

METHODS AND RESULTS:

Male Sprague-Dawley rats are fed with high-fat diet (HFD) rich in saturated and mono-unsaturated fatty acids or chow diet for 18 weeks. LC-MS analysis of thyroid shows that total free fatty acids (FFAs) content is significantly higher in HFD rats. The concentration of highly saturated triglycerides significantly increases in HFD rats, whereas the polyunsaturated triglyceride significantly decreases, indicating the decrease in unsaturation in the HFD group. Significant increase of lysophosphatidylcholines (LPC) is observed in HFD rats. Thyroid function tests show hypothyroxinemia (total thyroxine [TT4 ] and free thyroxine [FT4 ]) in HFD rats, and elevated thyrotropin (TSH) concentration. The HFD rats also show decreased thyroid uptake of iodine.

CONCLUSION:

Excess intake of dietary fat induces disturbance of thyroid lipid profile and hypothyroxinemia, indicating thyroid dysfunction. We speculate that it may provide a new prospect in understanding the pathogenesis of hypothyroidism.

KEYWORDS:

high-fat diet; hypothyroidism; hypothyroxinemia; lipid profile; lipidomics

PMID:
29363248
DOI:
10.1002/mnfr.201700599
[Indexed for MEDLINE]

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