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

• Published in: Menopause (New York, N.Y.) Vol. 25; no. 2; pp. 197 - 201
• Main Authors: Haas, Andrea V, Cong, Elaine, Simpson, Christine A, Sukumar, Nitin, Deng, Yanhong, Insogna, Karl L
• Format: Journal Article
• Language: English
• Published: United States by The North American Menopause Society 01-02-2018
• Subjects: Bone Density - drug effects; Estrogen Replacement Therapy; Estrogens - blood; Estrogens - deficiency; Female; Femur Head - diagnostic imaging; Femur Neck - diagnostic imaging; Humans; Macrophage Colony-Stimulating Factor - blood; Middle Aged; Postmenopause; Randomized Controlled Trials as Topic; Spine - diagnostic imaging
• ISSN: 1072-3714; 1530-0374
• DOI: 10.1097/GME.0000000000000974

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.