Estrogen inhibits interleukin-6 production and gene expression in a human osteoblastic cell line with high levels of estrogen receptors
✍ Scribed by Moustapha Kassem; Steven A. Harris; Thomas C. Spelsberg; B. Lawrence Riggs
- Publisher
- American Society for Bone and Mineral Research
- Year
- 2009
- Tongue
- English
- Weight
- 848 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0884-0431
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✦ Synopsis
Some studies suggest that estrogen acts on bone by decreasing the production of interleukin-6 (IL-6), a cytokine that increases bone resorption, by osteoblasts or bone marrow cells. However, other studies have not confirmed this, possibly because of a low and variable number of estrogen receptors (ER) in the model systems used. Thus, we employed a recently developed human fetal osteoblast cell line with high levels of ER. Treatment (n = 4 experiments) with 0.01 to 10 nM of 17P-estradiol had no effect on the constitutive production of IL-6. However, stimulated production, induced by treatment with IL-lP plus tumor necrosis factor-a (TNF-a), was reduced in a dose-dependent manner to 74 f 3% (mean k SEM) of control (p < 0.01). This response was blocked by cotreatment with the type I1 antiestrogen ICI 182,780. Treatment with hydrocortisone (1 pM), a known inhibitor of IL-6 production in many cell types, reduced IL-6 production to 17 f 1% of control ( p < 0.001). As assessed by Northern analysis, treatment (n = 3 experiments) with 0.01-10 nM of 17P-estradiol decreased steady-state levels of 1L-6 mRNA in a dose-dependent manner. These data support the hypothesis that at least part of the antiresorptive action of estrogen in humans is mediated by decreased production of I L 6 by osteoblastic cells. (J