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Menopause. 2018 Feb;25(2):197-201. doi: 10.1097/GME.0000000000000974.

Associations among circulating colony-stimulating factor-1, estrogen, and bone mineral density in postmenopausal women: results from a randomized placebo-controlled trial.

Author information

1
Department of Internal Medicine, Yale University School of Medicine, New Haven, CT.
2
Yale School of Public Health, Yale Center for Analytical Sciences, New Haven, CT.

Abstract

OBJECTIVE:

This study addresses the relationship between circulating levels of colony-stimulating factor 1 (CSF-1) and rates of postmenopausal bone loss. The purpose was to test the hypothesis that CSF-1 levels would correlate with the rate of bone loss in estrogen-deficient woman. We further hypothesized that estrogen replacement would eliminate this association.

METHODS:

This was an ancillary study to the parent Kronos Early Estrogen Prevention Study (KEEPS)-a 4-year randomized placebo-controlled study that evaluated the effects of estrogen therapy on cardiovascular endpoints. Women between of the ages of 42 and 58, who had been amenorrheic for ≥6 months and ≤36 months, were enrolled in KEEPS. Participants were randomized to conjugated equine estrogen 0.45 mg daily, transdermal estradiol 50 micrograms weekly, or placebo.

RESULTS:

There was no correlation between serum levels of CSF-1 and bone mineral density at the spine, hip, or femoral neck in estrogen-deficient women (correlation 0.0017, P = 0.99 for spine; correlation 0.0010, P = 0.0079 for hip, and correlation 0.0019, P = 0.99 for femoral neck). There was also no significant correlation in the treatment group (correlation 0.0015, P = 0.99; correlation -0.00024, P = 0.99; correlation 0.0011, P = 0.99 at spine, hip, and femoral neck respectively).

CONCLUSIONS:

This study did not demonstrate a meaningful relationship between circulating levels of CSF-1 and bone mineral density in either the placebo group or estrogen-treated group. Although CSF-1 is required for osteoclastic bone resorption, our data suggest that circulating levels of the cytokine may not reflect this process.

PMID:
28816930
DOI:
10.1097/GME.0000000000000974
[Indexed for MEDLINE]

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