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Pulsatile secretion of thyrotropin in children

S Loche1, V Cherubini, E Bartolotta

  • 1Servizio di Endocrinologia Pediatrica, Ospedale Microcitemico, Cagliari, Italy.

Journal of Endocrinological Investigation
|March 1, 1994
PubMed

Insights

Thyroid-stimulating hormone (TSH) secretion in children follows a pulsatile pattern, similar to adults. This study found increased TSH pulse frequency during nighttime hours in short, normal prepubertal children.

Area of Science:

  • Pediatric Endocrinology
  • Chronobiology
  • Hormone Secretion Dynamics

Background:

  • Thyroid-stimulating hormone (TSH) plays a crucial role in regulating thyroid function.
  • Previous studies in adults have demonstrated pulsatile TSH secretion.
  • Understanding TSH secretion patterns in children is essential for diagnosing endocrine disorders.

Purpose of the Study:

  • To investigate the pulsatile secretion of TSH in short, normal prepubertal children.
  • To characterize the circadian rhythm and pulse characteristics of TSH secretion in this pediatric population.
  • To compare TSH secretion patterns in children with those observed in adults.

Main Methods:

  • Serum TSH levels were measured every 30 minutes over a 24-hour period in eight prepubertal children.
  • Analysis included assessment of TSH pulse frequency, amplitude, and concentration.
  • Comparison of nocturnal versus diurnal TSH secretion patterns was performed.

Main Results:

  • All children exhibited a distinct circadian pattern of TSH secretion.
  • Pulsatile TSH secretion was consistently identified, with a mean frequency of 6.9 pulses/24h.
  • TSH concentrations and pulse frequency were significantly higher during nighttime hours compared to daytime.

Conclusions:

  • Pulsatile TSH secretion is a characteristic feature in short, normal prepubertal children.
  • The nocturnal surge in TSH is primarily driven by an increased pulse frequency, not amplitude.
  • These findings support the presence of similar TSH secretion dynamics across different age groups.

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