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Transient isolated marked elevation of midregion parathyroid hormone fragments in an infant

Takaya Nakane1, Kohsuke Higashida, Kanji Sugita

  • 1Department of Pediatrics, University of Yamanashi, Yamanashi, Japan. tnakane99@gmail.com

Journal of Pediatric Endocrinology & Metabolism : JPEM
|February 22, 2013
PubMed

Insights

Midregion parathyroid hormone (M-PTH) fragments elevated transiently in an infant, without affecting calcium levels or bone resorption. This suggests M-PTH fragments do not impact bone calcium release in humans.

Area of Science:

  • Pediatric Endocrinology
  • Biochemistry
  • Bone Metabolism

Background:

  • Parathyroid hormone (PTH) regulates calcium homeostasis.
  • Midregion PTH (M-PTH) fragments are byproducts of PTH metabolism.
  • The physiological role of M-PTH fragments is not fully understood.

Observation:

  • A Japanese male infant presented with a large anterior fontanel, delayed fontanel closure, and mild short stature.
  • Serum M-PTH fragments were markedly elevated (>3200 pg/mL) but transient.
  • Full-length PTH and carboxy-terminal fragments remained within normal limits.
  • The infant was normocalcemic with normal urine calcium/creatinine and no subperiosteal bone resorption.

Findings:

  • M-PTH fragment levels decreased logarithmically with age.
  • Despite elevated M-PTH, no hypercalcemia or signs of increased bone resorption were observed.
  • This case indicates that elevated M-PTH fragments do not stimulate calcium release from bones in humans.

Implications:

  • M-PTH fragments may not be a reliable indicator of parathyroid gland activity in certain pediatric conditions.
  • Further research is needed to elucidate the specific functions, if any, of M-PTH fragments.
  • This finding contributes to a better understanding of PTH metabolism and calcium regulation.

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