Serum Metabolomics Reveals Cholic Acid, Chenodeoxycholic Acid, and Taurochenodeoxycholic Acid as Potential Biomarkers for Hypothyroid Rats
Hypothyroidism decreases energy metabolism including carbohydrate and lipid metabolism and protein synthesis, due to reduced serum levels of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). Although many endogenous serum metabolites are influenced by hypothyroidism, serum metabolomic profiling has rarely been applied to the study of hypothyroidism. In the present study, we investigated potential biomarkers for hypothyroidism using serum metabolomics, and then measured serum levels of these endogenous metabolites using an analytical method: ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. There was a significant difference in the metabolic profiles of thyroidectomized (Tx) and normal rats. We found that many bile acid (BA) levels were significantly changed in serum of Tx rats. Simultaneous measurement of 12 different BAs in serum revealed that cholic acid (CA), chenodeoxycholic acid (CDCA), and taurochenodeoxycholic acid (TCDCA) levels significantly increased in Tx rats by approximately 25-fold, 11-fold, and 3-fold, respectively, compared with those of control rats. In Tx rats with active hormone T3 replacement, serum T3 levels were returned to physiological levels. However, these changes in BA levels were maintained at a high level. These results indicate that T3 replacement does not normalize the thyroid hormonal milieu. Thus, increased CA, CDCA, and TCDCA levels in serum after Tx may be a homeostatic response to not only T3 but also pro-thyroid hormone T4 deficiency. This study is the first to report that CA, CDCA, and TCDCA may be potential biomarkers for hypothyroidism and the efficacy of thyroid hormone replacement therapy in hypothyroidism.
Serum Metabolomics Reveals Cholic Acid, Chenodeoxycholic Acid, and Taurochenodeoxycholic Acid as Potential Biomarkers for Hypothyroid Rats, American Journal of Life Sciences.
Vol. 3, No. 4,
2015, pp. 295-305.
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