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[Bone and Men's Health. Function of androgen receptor in bone tissues]

Shigeaki Kato1, Yuuki Imai

  • 1IMCB, The University of Tokyo/ERATO, JST.

Clinical Calcium
|February 2, 2010
PubMed

Insights

Androgens promote bone health by suppressing bone resorption in osteoclasts, not just through anabolic effects. This finding reveals a key mechanism for androgen action in skeletal tissues.

Area of Science:

  • Endocrinology
  • Bone Biology
  • Molecular Genetics

Context:

  • Androgens are known to have anabolic effects on skeletal tissues.
  • The specific cells and genes mediating these effects remain largely unidentified.
  • Osteoclasts play a critical role in bone resorption.

Purpose:

  • To investigate the role of the androgen receptor (AR) in osteoclasts.
  • To determine the cellular targets of androgen action in bone metabolism.
  • To elucidate the mechanism by which androgens influence bone density.

Summary:

  • A mouse model with selective ablation of the androgen receptor gene in osteoclasts was created.
  • Male mutants exhibited an osteoporotic phenotype, indicating impaired bone maintenance.
  • This suggests that androgens exert anabolic effects on bone by repressing osteoclast-mediated bone resorption.

Impact:

  • Identifies osteoclasts as key targets for androgen action in bone.
  • Reveals that androgen's anabolic effect on bone is mediated by suppressing bone resorption.
  • Provides new insights into the hormonal regulation of bone metabolism and potential therapeutic targets for osteoporosis.

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