Citations to this article

Decreased hypothalamic growth hormone-releasing hormone content and pituitary responsiveness in hypothyroidism.
H Katakami, … , T R Downs, L A Frohman
H Katakami, … , T R Downs, L A Frohman
Published May 1, 1986
Citation Information: J Clin Invest. 1986;77(5):1704-1711. https://doi.org/10.1172/JCI112490.
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Research Article

Decreased hypothalamic growth hormone-releasing hormone content and pituitary responsiveness in hypothyroidism.

Abstract

The effects of thyroidectomy (Tx) and thyroxine replacement (T4Rx) on pituitary growth hormone (GH) secretion and hypothalamic GH-releasing hormone (GRH) concentration were compared to define the mechanism of hypothyroid-associated GH deficiency. Thyroidectomized rats exhibited a complete loss of pulsatile GH secretion with extensive reduction in GRH responsiveness and pituitary GH content. Cultured pituitary cells from Tx rats exhibited reduced GRH sensitivity, maximal GH responsiveness, and intracellular cyclic AMP accumulation to GRH, while somatostatin (SRIF) suppressive effects on GH secretion were increased. Hypothalamic GRH content was also markedly reduced. T4Rx completely restored hypothalamic GRH content and spontaneous GH secretion despite only partial recovery of pituitary GH content, GRH and SRIF sensitivity, and intracellular cyclic AMP response to GRH. The results indicate multiple effects of hypothyroidism on GH secretion and suggest that a critical role of T4 in maintaining normal GH secretion, in addition to restoring GH synthesis, is related to its effect on hypothalamic GRH.

Authors

H Katakami, T R Downs, L A Frohman

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