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[Sex steroids and bone tissue]

C Ribot1, F Tremollieres

  • 1Service d'Endocrinologie, C.H.U. Purpan, Toulouse.

Annales D'Endocrinologie
|January 1, 1995
PubMed
Summary

Sexual steroids like estrogens, androgens, and progesterone directly regulate bone tissue. They influence bone formation and resorption through complex mechanisms, maintaining skeletal health and calcium balance.

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Area of Science:

  • Endocrinology
  • Bone Biology
  • Cellular Signaling

Context:

  • The precise mechanisms by which sexual steroids regulate bone tissue remain incompletely understood.
  • While indirect actions via calciotropic hormones are known, direct effects are evidenced by steroid receptors on bone cells.
  • Sexual steroids (estrogens, androgens, progesterone) play a direct role in bone metabolism.

Purpose:

  • To elucidate the direct mechanisms of sexual steroid action on bone tissue regulation.
  • To summarize the current understanding of how estrogens, androgens, and progesterone influence bone cells and overall skeletal integrity.

Summary:

  • Estrogens exhibit anti-osteoclastic activity by modulating osteoblast-derived factors (e.g., IL-1, IL-6, TGF-β, GM-CSF) that inhibit osteoclastogenesis and bone resorption.
  • Estrogens may also promote bone formation, with evidence suggesting direct effects on osteoblasts and the presence of estrogen receptors on osteoclasts.
  • Androgens can stimulate bone formation in vitro, potentially mediated by TGF-β, enhancing osteoblast proliferation and differentiation.
  • Progesterone has recently been shown to increase osteoblast growth and IGF-II secretion in vivo.
  • These diverse actions highlight the complex interplay of sex hormones in maintaining skeletal structure and calcium homeostasis.

Impact:

  • Provides a comprehensive overview of the direct roles of sexual steroids in bone health.
  • Highlights the complexity of hormonal regulation in maintaining skeletal integrity and calcium balance.
  • Identifies potential therapeutic targets for bone-related disorders by understanding sex hormone actions.

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