Journal: Journal of Bone Metabolism
Article Title: Bone Morphogenetic Protein-2 Desensitizes MC3T3-E1 Osteoblastic Cells to Estrogen Through Transcriptional Downregulation of Estrogen Receptor 1
Figure Lengend Snippet: Bone morphogenetic protein-2 downregulates a reporter activity driven by mouse estrogen receptor1 gene promoter in MC3T3-E1 cells. (A) MC3T3-E1-MERAluc1 cells (clone#1-4) were treated with 1alpha,25-dihydroxy-vitamin D 3 (1,25-[OH] 2 D 3 ; 10 nM), estradiol (E2; 100 nM), 4-hydroxy-tamoxifen (4-OH-Tam; 100 nM), phorbol-12-myristate-13-acetate (PMA; 10 nM), dibutyryl cyclic adenosine monophosphate (dbcAMP; 1 mM), recombinant mouse epidermal growth factor (rmEGF; 100 ng/mL) and recombinant human bone morphogenetic protein-2 (rhBMP-2; 250 ng/mL). After a 48-hour incubation, these cells were harvested and lysed then, luciferase activities in the lysates were measured. Luciferase activities in the vehicle-treated cells were set at 1. (B) MC3T3-E1 cells were transiently transfected with pMERAluc1 (0.5 µg) along with pSV-β-gal (0.3 µg) for normalization of transfection efficiency, incubated for 24 hours and exposed by rhBMP-2 (250 ng/mL) or vehicle. Forty-eight hours later, the cells were harvested and lysed in LCβ lysis buffer. Luciferase activities were measured as described in the Materials and Methods section. The results are indicated as relative values when the normalized luciferase activity of the vehicle-treated cells is set at 1. * P
Article Snippet: Phorbol-12-myristate-13-acetate (PMA) and dibutyryl cyclic adenosine monophosphate (dbcAMP) were purchased from Wako (Osaka, Japan).
Techniques: Activity Assay, Recombinant, Incubation, Luciferase, Transfection, Lysis