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Thyroid hormone and estrogen regulate exercise-induced growth hormone release.

Daniele Leão Ignacio1, Diego H da S Silvestre1, João Paulo Albuquerque Cavalcanti-de-Albuquerque1

  • 1Institute of Biophysics Carlos Chagas Filho and School of Physical Education and Sports, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.

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Exercise-induced growth hormone (GH) secretion is impaired by estrogen deficiency. Pituitary type 1 deiodinase (D1) activation is crucial for this exercise response.

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Area of Science:

  • Endocrinology
  • Exercise Physiology
  • Metabolism

Background:

  • Growth hormone (GH) is vital for whole-body metabolism.
  • Physical exercise is a potent stimulus for GH secretion.
  • The precise mechanisms of exercise-induced GH secretion are not fully understood.

Purpose of the Study:

  • To investigate the roles of estrogen and pituitary type 1 deiodinase (D1) activation in exercise-induced GH secretion.
  • To determine if estrogen deficiency impacts GH and D1 activity following exercise.
  • To assess the necessity of D1 activation for exercise-induced GH release.

Main Methods:

  • Ovariectomy was performed on rats, followed by treadmill exercise.
  • Tissues were harvested post-exercise for analysis of D1 activity and GH levels.
  • Pharmacological inhibition of D1 using propylthiouracil (PTU) was employed in intact rats during exercise.

Main Results:

  • Exercise significantly increased D1 activity and GH levels in sham-operated rats.
  • Estrogen-deficient rats showed blunted D1 activity and GH responses post-exercise.
  • Pharmacological inhibition of D1 abolished exercise-induced GH secretion.

Conclusions:

  • Estrogen deficiency impairs pituitary D1 enzyme induction and GH release following acute exercise.
  • Acute activation of pituitary type 1 deiodinase is essential for the exercise-induced GH response.
  • These findings highlight the interplay between estrogen, D1, and GH regulation during physical activity.