An AP-1 site in the nerve growth factor promoter is essential for 1, 25-dihydroxyvitamin D3-mediated nerve growth factor expression in osteoblasts

Biochemistry
T D VeenstraR Kumar

Abstract

1,25-Dihydroxyvitamin D3 (1,25(OH)2D3), the active metabolite of vitamin D, induces nerve growth factor (NGF) synthesis in a variety of different cell lines. The mechanism by which 1,25(OH)2D3 induces NGF, however, is poorly understood. We used a series of full-length and truncated NGF promoter-human growth hormone (hGH) reporter gene plasmids to investigate the mechanism of 1,25(OH)2D3-induced NGF expression in osteoblasts. Untransfected rat osteosarcoma cells (ROS 17/2.8) treated with 1,25(OH)2D3 showed a 2-fold increase in NGF expression compared to control cells. ROS 17/2.8 osteosarcoma cells were transfected with the NGF-hGH reporter plasmids and treated with 10(-)8 M 1,25(OH)2D3. The full-length NGF promoter (-1800 to +120)-hGH reporter construct showed an approximately 2-fold increase in hGH release. Plasmids with successive 5'-deletions showed enhanced hGH expression in treated cells and control cells. A similar series of NGF promoter-hGH reporter gene constructs, lacking the AP-1 site located within the first intron of the NGF gene, were also transiently transfected into ROS 17/2.8 cells. When these cells were treated with the same dose of 1,25(OH)2D3, no increase in hGH expression was seen compared to control cells, d...Continue Reading

Citations

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