Estrogens and bone health in men

Sundeep Khosla, L. J. Melton, B. L. Riggs

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

It has generally been held that estrogen and testosterone are the major sex steroids regulating bone metabolism in women and men, respectively. However, the description of several "experiments of nature" led to a reconsideration of this notion. Thus, a male carrying homozygous mutations in the ER-α gene and two males with homozygous mutations in the aromatase gene had osteopenia, unfused epiphyses, and elevated indices of bone turnover. Though these findings indicated that estrogen plays a role in regulating the male skeleton, they left unresolved the issue of whether estrogen acted on the male skeleton mainly to enhance bone mass acquisition during growth and maturation, or whether it also acted to retard bone loss in aging individuals. To address this issue, several cross-sectional observational studies have related bone mineral density (BMD) to sex steroids in elderly men, and found that estrogen correlated better than testosterone with BMD. In addition, recent longitudinal studies from our group indicate that bioavailable estrogen correlated better than testosterone both with the gain in BMD in young men and with loss of BMD in elderly men. These observational studies do not, however, prove causality, which requires direct interventional studies. Thus, we eliminated endogenous testosterone and estrogen production in 59 elderly men (mean age 68 years), studied them first under conditions of physiologic testosterone and estrogen replacement, and then assessed the impact on bone turnover of withdrawing both testosterone and estrogen, withdrawing only testosterone, only estrogen, or continuing both. We found that estrogen played the major role in regulating bone resorption in these men, and that both estrogen and testosterone were important in maintaining bone formation. Collectively then, these findings indicate that estrogen plays a dominant role in regulating the male skeleton.

Original languageEnglish (US)
Pages (from-to)189-192
Number of pages4
JournalCalcified Tissue International
Volume69
Issue number4
DOIs
StatePublished - 2001

Fingerprint

Men's Health
Estrogens
Bone and Bones
Testosterone
Bone Density
Skeleton
Bone Remodeling
Observational Studies
Steroids
Mutation
Epiphyses
Estrogen Replacement Therapy
Aromatase
Metabolic Bone Diseases
Bone Resorption
Osteogenesis
Causality
Genes
Longitudinal Studies
Cross-Sectional Studies

Keywords

  • Bone loss
  • Bone turnover
  • Male osteoporosis
  • Sex steroids

ASJC Scopus subject areas

  • Endocrinology

Cite this

Estrogens and bone health in men. / Khosla, Sundeep; Melton, L. J.; Riggs, B. L.

In: Calcified Tissue International, Vol. 69, No. 4, 2001, p. 189-192.

Research output: Contribution to journalArticle

Khosla, Sundeep ; Melton, L. J. ; Riggs, B. L. / Estrogens and bone health in men. In: Calcified Tissue International. 2001 ; Vol. 69, No. 4. pp. 189-192.
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