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Follicle-stimulating hormone promotes RANK expression on human monocytes.

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Elevated follicle-stimulating hormone (FSH) may increase bone loss by promoting osteoclast precursor cells. This study found FSH significantly increased a key osteoclast marker on myeloid cells, suggesting a novel mechanism for bone density decline.

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Area of Science:

  • Endocrinology
  • Bone Biology
  • Immunology

Background:

  • Elevated serum follicle-stimulating hormone (FSH) is linked to reduced bone density in women pre-menopause.
  • This decline in bone density occurs years before menopause and estradiol reduction.

Purpose of the Study:

  • To investigate the hypothesis that FSH promotes myeloid cell differentiation into bone-resorbing osteoclasts.
  • To determine the effect of physiological FSH concentrations on osteoclast precursor development.

Main Methods:

  • Peripheral blood mononuclear cells were isolated from healthy adults.
  • Cells were incubated with varying physiological concentrations of FSH.
  • Expression of the osteoclast marker receptor activator for NF-κB (RANK) on CD14+ cells was measured via flow cytometry.

Main Results:

  • FSH exposure led to a dose-dependent, biphasic increase in RANK-expressing cells.
  • A maximal 1.5-fold increase in RANK(high) cells was observed at 50 mIU/ml FSH.
  • FSH did not significantly alter concentrations of key cytokines like M-CSF, OPG, or TNFα; RANK-ligand was undetectable.

Conclusions:

  • The findings support FSH's role in promoting osteoclast precursor development.
  • Elevated FSH during perimenopause may contribute to accelerated bone loss.
  • This suggests a novel pathway linking hormonal changes to bone resorption.