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TSH and bone loss.

Li Sun1, Terry F Davies, Harry C Blair

  • 1Department of Medicine, Mount Sinai Bone Program, Mount Sinai School of Medicine, New York, NY 10029, USA.

Annals of the New York Academy of Sciences
|July 13, 2006
PubMed
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Thyroid-stimulating hormone (TSH) inhibits bone resorption by osteoclasts, challenging previous views. Low TSH levels are linked to reduced bone density and increased fracture risk, particularly in hyperthyroidism.

Area of Science:

  • Endocrinology
  • Bone Biology
  • Osteoporosis Research

Background:

  • Hyperthyroidism is associated with bone loss, traditionally attributed solely to excess thyroid hormones.
  • The role of pituitary hormones, specifically TSH, in bone metabolism is an emerging area of research.

Purpose of the Study:

  • To investigate the direct role of thyroid-stimulating hormone (TSH) in regulating bone resorption.
  • To challenge the established view that hyperthyroid bone loss is only due to high thyroid hormone levels.

Main Methods:

  • Utilized mouse models with TSH receptor haploinsufficiency.
  • Administered TSH to human subjects and measured markers of bone resorption.
  • Correlated TSH levels with bone density and fracture risk in human populations.

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Main Results:

  • Mice lacking one TSH receptor copy exhibited lower bone density and increased bone resorption despite normal thyroid function.
  • A single dose of TSH suppressed bone resorption markers in humans.
  • Low TSH levels in humans correlated significantly with an elevated risk of fractures.

Conclusions:

  • TSH directly inhibits osteoclast-mediated bone resorption, independent of thyroid hormone levels.
  • Low TSH levels represent a risk factor for osteoporosis and fractures, particularly in hyperthyroid individuals.
  • Pituitary hormones play a significant, underappreciated role in maintaining bone health and preventing bone loss.