Human prolactin and thyrotropin concentrations in the serums of normal and hypopituitary children before and after the administration of synthetic thyrotropin-releasing hormone
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Summary
This summary is machine-generated.Synthetic thyrotropin-releasing hormone (TRH) stimulates thyrotropin (TSH) and prolactin (HPr) release in children. Low thyroid hormone levels elevate HPr, which normalizes with thyroid replacement therapy, indicating its role in regulating prolactin secretion.
Area Of Science
- Pediatric endocrinology
- Neuroendocrinology
Background
- Thyrotropin-releasing hormone (TRH) is a key regulator of the hypothalamic-pituitary-thyroid axis.
- Understanding TRH's effects on TSH and prolactin (HPr) is crucial for diagnosing pituitary and hypothalamic disorders in children.
Purpose Of The Study
- To investigate the effects of synthetic TRH on serum TSH and HPr concentrations in normal children and those with hypopituitarism.
- To assess the influence of thyroid hormone status on HPr response to TRH.
Main Methods
- Administration of synthetic TRH (7 mug/kg i.v.) to normal children and hypopituitary patients.
- Measurement of serum TSH and HPr concentrations using radioimmunoassay at baseline and 15-minute intervals for 2 hours post-TRH.
- Comparison of responses between different patient groups and before/after thyroid replacement therapy.
Main Results
- Normal children showed a significant increase in HPr post-TRH.
- Patients with GH deficiency but normal TSH had a blunted HPr response compared to normal children.
- Patients with GH and TSH deficiency exhibited elevated baseline and post-TRH HPr levels, which normalized after thyroid replacement therapy.
- TSH responses were generally preserved in hypopituitary patients without TSH deficiency.
Conclusions
- Synthetic TRH stimulates simultaneous TSH and HPr release in children.
- Low thyroxine (T4) and/or triiodothyronine (T3) levels are associated with elevated HPr levels, suggesting thyroid hormones modulate prolactin secretion.
- TRH stimulation tests aid in differentiating pituitary from hypothalamic defects, but further evaluation is needed for specific hypothalamic dysfunction.