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Home/Organ & Specialty Systems/TRH (Thyrotropin-Releasing Hormone)

TRH (Thyrotropin-Releasing Hormone)

A hypothalamic tripeptide that releases TSH and prolactin; synthetic TRH (protirelin) is used in diagnostic endocrine testing.

Overview

TRH (thyrotropin-releasing hormone; protirelin) is a hypothalamic tripeptide (pGlu-His-Pro-NH2) that stimulates the pituitary to release thyroid-stimulating hormone (TSH) and prolactin. Synthetic TRH has long been used as a diagnostic agent in endocrine testing and remains a research tool in neuroendocrinology and neuropharmacology.

Mechanism

TRH is released from the hypothalamus into the pituitary portal circulation and activates TRH receptors on pituitary thyrotrophs and lactotrophs, triggering TSH and prolactin secretion that in turn drives thyroid hormone output. Beyond the pituitary, TRH and its receptors are distributed in the brain, where the peptide exerts neuromodulatory effects on arousal, thermoregulation, and autonomic function.

Dosing

Diagnostic use involves an intravenous bolus with serial TSH sampling; research applications in animal models use species-specific systemic or central administration. TRH is a short-lived peptide and is not used for chronic systemic therapy.

  • Intravenous bolus administration is standard in TRH stimulation testing
  • Serial blood sampling captures the TSH peak after injection
  • Animal neuropharmacology studies may use central routes

Expected Effects

  • Prompt rise in serum TSH and prolactin after administration
  • Diagnostic discrimination between hypothalamic and pituitary causes of thyroid dysfunction
  • Transient neuromodulatory effects at research doses

Side Effects & Tolerability

Transient side effects after intravenous administration include flushing, nausea, an urge to urinate, and blood-pressure changes; these resolve quickly given the peptide's short half-life. Precautions relate mainly to cardiac risk during acute TSH stimulation in testing contexts.

Storage

Lyophilized peptide should be stored cold and desiccated, protected from light and moisture. Reconstituted solutions are typically used promptly or aliquoted and frozen, avoiding repeated freeze-thaw cycles.

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