TY - JOUR
T1 - Thyroid hormone metabolism defects in a mouse model of SBP2 deficiency
AU - Fu, Jiao
AU - Fujisawa, Haruki
AU - Follman, Benjamin
AU - Liao, Xiao Hui
AU - Dumitrescu, Alexandra M.
N1 - Publisher Copyright:
Copyright © 2017 Endocrine Society.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - Selenocysteine insertion sequence binding protein 2 (SBP2) is an essential factor in selenoprotein synthesis. Patients with SBP2 defects have a characteristic thyroid phenotype and additional manifestations such as growth delay, male infertility, impaired motor coordination, and developmental delay. The thyroid phenotype has become pathognomonic for this defect, and putative deficiencies in the iodothyronine deiodinases selenoenzymes have been implicated. To investigate the role of SBP2 and selenoproteins in thyroid physiology and answer questions raised by the human syndrome, we generated a tamoxifen-inducible Sbp2 conditional knockout (iCKO) mouse model. These Sbp2-deficient mice have high serum thyroxine (T4), thyrotropin, and reverse triiodothyronine (T3), similar to the human phenotype of SBP2 deficiency, whereas serum T3 is normal. Their liver T4 and T3 content reflect the serum levels, and deiodinase 1 expression and enzymatic activity were decreased. In contrast, brain T3 content is decreased, indicative of local hypothyroidism, confirmed by the decreased expression of the thyroid hormone (TH) positively regulated gene hairless. Interestingly, the cerebrum T4 content did not parallel the high serum T4 levels, and the expression of TH transporters was decreased. Deiodinase 2 enzymatic activity and deiodinase 3 expression were decreased in cerebrum. The expression and/or activity of other selenoproteins were decreased in brain, liver, and serum, thus demonstrating a global deficiency in selenoprotein synthesis. Sbp2 iCKO mice replicate the thyroid phenotype of SBP2 deficiency and represent an important tool to advance our understanding of the role of SBP2 in thyroid homeostasis and for investigating selenoprotein biology relevant to human disease.
AB - Selenocysteine insertion sequence binding protein 2 (SBP2) is an essential factor in selenoprotein synthesis. Patients with SBP2 defects have a characteristic thyroid phenotype and additional manifestations such as growth delay, male infertility, impaired motor coordination, and developmental delay. The thyroid phenotype has become pathognomonic for this defect, and putative deficiencies in the iodothyronine deiodinases selenoenzymes have been implicated. To investigate the role of SBP2 and selenoproteins in thyroid physiology and answer questions raised by the human syndrome, we generated a tamoxifen-inducible Sbp2 conditional knockout (iCKO) mouse model. These Sbp2-deficient mice have high serum thyroxine (T4), thyrotropin, and reverse triiodothyronine (T3), similar to the human phenotype of SBP2 deficiency, whereas serum T3 is normal. Their liver T4 and T3 content reflect the serum levels, and deiodinase 1 expression and enzymatic activity were decreased. In contrast, brain T3 content is decreased, indicative of local hypothyroidism, confirmed by the decreased expression of the thyroid hormone (TH) positively regulated gene hairless. Interestingly, the cerebrum T4 content did not parallel the high serum T4 levels, and the expression of TH transporters was decreased. Deiodinase 2 enzymatic activity and deiodinase 3 expression were decreased in cerebrum. The expression and/or activity of other selenoproteins were decreased in brain, liver, and serum, thus demonstrating a global deficiency in selenoprotein synthesis. Sbp2 iCKO mice replicate the thyroid phenotype of SBP2 deficiency and represent an important tool to advance our understanding of the role of SBP2 in thyroid homeostasis and for investigating selenoprotein biology relevant to human disease.
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U2 - 10.1210/en.2017-00618
DO - 10.1210/en.2017-00618
M3 - Article
C2 - 29029094
AN - SCOPUS:85038377030
SN - 0013-7227
VL - 158
SP - 4317
EP - 4330
JO - Endocrinology
JF - Endocrinology
IS - 12
ER -