TY - JOUR
T1 - Leptin Administration Restores the Fasting-Induced Increase of Hepatic Type 3 Deiodinase Expression in Mice
AU - Boelen, Anita
AU - van Beeren, Mieke
AU - Vos, Xander
AU - Surovtseva, Olga
AU - Belegri, Evita
AU - Saaltink, Dirk-Jan
AU - Vreugdenhil, Erno
AU - Kalsbeek, Andries
AU - Kwakkel, Joan
AU - Fliers, Eric
PY - 2012
Y1 - 2012
N2 - Background: Decreased serum leptin has been proposed as a critical signal initiating the neuroendocrine response to fasting. Leptin administration partially reverses the fasting-induced suppression of the hypothalamus-pituitary-thyroid axis at the central level. It is, however, unknown to what extent leptin affects peripheral thyroid hormone metabolism. The aim of this study was to evaluate the effect of leptin administration on starvation-induced alterations of peripheral thyroid hormone metabolism in mice. Methods: Three types of experiments were performed: (i) mice were fasted for 24 hours while leptin was administered twice (at 0 and 8 hours, 1 mu g/g body weight [BW]), (ii) mice were fasted for 24 hours and, subsequently, leptin was given once at 24 hours (killed at 28 and 32 hours), and (iii) mice were fasted for 48 hours. All groups had appropriate controls. Serum triiodothyronine and thyroxine, liver type 1 deiodinase (D1), type 3 deiodinase (D3), thyroid hormone receptor (TR)beta 1, TR alpha 1 and alpha 2 mRNA expression, and liver D1 and D3 activity were measured. Results: Twenty-four hours of fasting decreased liver TR beta 1 mRNA expression, while liver TR alpha 1, TR alpha 2, and D1 mRNA expression and activity did not change. In contrast, 24 hours of fasting increased liver D3 mRNA. Leptin administration after fasting restored liver D3 expression, while serum thyroid hormone levels and liver TR beta 1 expression remained low. Conclusion: Leptin administration selectively restores starvation-induced increased hepatic D3 expression independently of serum thyroid hormone concentrations. The present study shows that fasting-induced changes in mRNA expression of genes involved in hepatic hormone metabolism are influenced not only by decreased serum thyroid hormone levels but also by serum leptin
AB - Background: Decreased serum leptin has been proposed as a critical signal initiating the neuroendocrine response to fasting. Leptin administration partially reverses the fasting-induced suppression of the hypothalamus-pituitary-thyroid axis at the central level. It is, however, unknown to what extent leptin affects peripheral thyroid hormone metabolism. The aim of this study was to evaluate the effect of leptin administration on starvation-induced alterations of peripheral thyroid hormone metabolism in mice. Methods: Three types of experiments were performed: (i) mice were fasted for 24 hours while leptin was administered twice (at 0 and 8 hours, 1 mu g/g body weight [BW]), (ii) mice were fasted for 24 hours and, subsequently, leptin was given once at 24 hours (killed at 28 and 32 hours), and (iii) mice were fasted for 48 hours. All groups had appropriate controls. Serum triiodothyronine and thyroxine, liver type 1 deiodinase (D1), type 3 deiodinase (D3), thyroid hormone receptor (TR)beta 1, TR alpha 1 and alpha 2 mRNA expression, and liver D1 and D3 activity were measured. Results: Twenty-four hours of fasting decreased liver TR beta 1 mRNA expression, while liver TR alpha 1, TR alpha 2, and D1 mRNA expression and activity did not change. In contrast, 24 hours of fasting increased liver D3 mRNA. Leptin administration after fasting restored liver D3 expression, while serum thyroid hormone levels and liver TR beta 1 expression remained low. Conclusion: Leptin administration selectively restores starvation-induced increased hepatic D3 expression independently of serum thyroid hormone concentrations. The present study shows that fasting-induced changes in mRNA expression of genes involved in hepatic hormone metabolism are influenced not only by decreased serum thyroid hormone levels but also by serum leptin
U2 - https://doi.org/10.1089/thy.2011.0289
DO - https://doi.org/10.1089/thy.2011.0289
M3 - Article
C2 - 22175243
SN - 1050-7256
VL - 22
SP - 192
EP - 199
JO - Thyroid
JF - Thyroid
IS - 2
ER -