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Related Experiment Videos

Androgens and the skeleton.

M K Lindberg1, L Vandenput, S Movèrare Skrtic

  • 1Division of Endocrinology, Department of Internal Medicine, Sahlgrenska University Hospital, Göteborg, Sweden. Marie.Lindberg@medic.gu.se

Minerva Endocrinologica
|May 7, 2005
PubMed
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Androgens and estrogens are crucial for maintaining bone mass and integrity. Androgen action on bone is mediated by the androgen receptor (AR) and estrogen receptor alpha (ER alpha), protecting men against osteoporosis.

Area of Science:

  • Endocrinology
  • Bone Biology
  • Reproductive Biology

Background:

  • Sex hormones, including androgens and estrogens, are vital for bone health.
  • Loss of these hormones leads to bone loss and an imbalance in bone remodeling.
  • The specific roles and interplay of androgen receptor (AR) and estrogen receptor (ER) pathways in bone regulation are not fully understood.

Purpose of the Study:

  • To investigate the distinct and combined roles of androgens and estrogens in maintaining bone mass and integrity.
  • To clarify the relative contributions of AR and ER pathways in mediating the effects of androgens on bone.
  • To understand the biphasic effects of androgens on bone growth and their implications for bone strength.

Main Methods:

  • Review of existing literature on sex steroid action in bone.

Related Experiment Videos

  • Analysis of experimental data, including studies in mice, investigating AR and ER signaling.
  • Examination of the effects of androgens and estrogens on bone remodeling, radial growth, and bone dimensions.

    • Main Results:

    • Both androgens and estrogens maintain cancellous bone mass and integrity.
    • Androgen action on bone is mediated through both AR and ER alpha.
    • Androgens promote radial bone growth via aromatization to estrogens and ER alpha interaction, contributing to greater bone dimensions in males.

    Conclusions:

    • Androgens protect men against osteoporosis by preserving cancellous bone and expanding cortical bone.
    • The protective effects of androgens on bone are mediated by the AR and ER alpha pathways.
    • Estrogens, particularly via ER alpha, play a role in androgen-mediated bone growth, while ER beta's role is more prominent in females.