Excess iodine and high-fat diet combination modulates lipid profile, thyroid hormone, and hepatic LDLr expression values in mice.
The aim of this study was to illustrate the combined effect of excess iodine and high-fat diet on lipid metabolism and its potential molecular mechanism. Sixty Balb/c mice were randomly allocated to three control groups or three excess iodine groups and fed with a high-fat diet in the absence or presence of 1,200 μg/L iodine for 1, 3, or 6 months, respectively. Serum lipid parameters and serum thyroid hormones were measured. Expressions of scavenger receptor class B type-I (SR-BI) and low density lipoproteins receptor (LDLr) mRNA and protein in liver were detected. Thyroid histology and liver type 1 iodothyronine deiodinase activity were analyzed. At the end of 3 and 6 months, compared with control, serum TC, TG, and LDL-C in excess iodine group were significantly lower (p < 0.05). LDLr expression in liver was increased significantly (p < 0.05) and parallel to the change of serum TC and TG. TT3 and TT4 levels in serum were elevated and TSH decreased significantly (p < 0.05). Liver type I iodothyronine deiodinase activity was significantly higher (p < 0.05) than control at the end of 6 months. Moreover, a time course damage effect of excess iodine combined with high-fat diet on thyroid glands was observed. The present findings demonstrated that excess iodine combined with high-fat diet could cause damage to thyroid glands and lead to thyroid hormone disorder. Those in turn caused the upregulation of hepatic LDLr gene, which resulted in the disorder in serum lipids.
Department of Nutrition and Food Hygiene, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.
Hao
H
Han
Peng
P
Xin
Lina
L
Zhao
Jian
J
Xu
Yun
Y
Xia
Xuefeng
X
Yang
Xiufa
X
Sun
Liping
L
Hao
D000818:Animals; D015153:Blotting, Western; D002784:Cholesterol / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D059305:Diet, High-Fat / Q000009:adverse effects*; D050171:Dyslipidemias / Q000097:blood / Q000209:etiology / Q000235:genetics; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D007453:Iodide Peroxidase / Q000378:metabolism; D007455:Iodine / Q000008:administration & dosage / Q000494:pharmacology* / Q000652:urine; D008055:Lipids / Q000097:blood*; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D011973:Receptors, LDL / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013961:Thyroid Gland / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D013963:Thyroid Hormones / Q000097:blood*; D013972:Thyrotropin / Q000097:blood; D013974:Thyroxine / Q000097:blood; D013997:Time Factors; D014131:Trace Elements / Q000008:administration & dosage / Q000494:pharmacology; D014280:Triglycerides / Q000097:blood; D014284:Triiodothyronine / Q000097:blood
D008078:Cholesterol, LDL; D008055:Lipids; D011973:Receptors, LDL; D013963:Thyroid Hormones; D014131:Trace Elements; D014280:Triglycerides; D014284:Triiodothyronine; D013972:Thyrotropin; D007455:Iodine; D002784:Cholesterol; D007453:Iodide Peroxidase; D013974:Thyroxine