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Racial differences in parathyroid hormone dynamics

G E Fuleihan1, C M Gundberg, R Gleason

  • 1Endocrine-Hypertension Division, Brigham and Women's Hospital, Boston, Massachusetts 02115.

The Journal of Clinical Endocrinology and Metabolism
|December 1, 1994
PubMed
Summary
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Black subjects exhibit higher parathyroid hormone (PTH) levels and responses, indicating mild hyperparathyroidism. This suggests potential skeletal resistance to PTH in this population, despite higher bone density.

Area of Science:

  • Endocrinology
  • Bone Metabolism
  • Racial Physiology

Background:

  • Elevated parathyroid hormone (PTH) levels are sometimes reported in Black subjects, which appears paradoxical given their higher bone mineral density and lower fracture rates.
  • Previous observations of racial differences in PTH levels have lacked consistency.

Purpose of the Study:

  • To dynamically characterize racial differences in the calcium-parathyroid hormone (PTH) axis.
  • To investigate potential racial variations in PTH dynamics and skeletal response.

Main Methods:

  • Studied six healthy Black and six healthy White volunteers.
  • Defined the inverse sigmoidal curve relating serum ionized calcium to intact PTH levels.
  • Assessed PTH and osteocalcin responses to dynamic calcium challenges (hypo- and hypercalcemia).

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Main Results:

  • Black subjects demonstrated significantly higher maximal and minimal intact PTH responses compared to White subjects.
  • No significant differences were observed in the set-points or slopes of the calcium-PTH relationship curves between racial groups.
  • Despite higher PTH levels, Black subjects exhibited lower osteocalcin levels, both at baseline and after stimulation.

Conclusions:

  • Dynamic studies confirm mild hyperparathyroidism in Black subjects.
  • Findings suggest a potential mild skeletal resistance to PTH in Black individuals.
  • Racial differences in PTH dynamics warrant further investigation into bone health disparities.