Figure 4: Mutation of SP1 sites blunts the activation of the LHCGR promoter.
hLGCs were plated for 24 h in serum-free media followed by a 48-hour incubation with a lentiviral vector carrying a control reporter plasmid, a plasmid containing an intact proximal human LHCGR promoter, or a plasmid containing mutations in the SP1 sites of the LHCGR promoter. Cells were harvested after no treatment (C) or treatment with hCG (50 ng/ml), forskolin (5 μM), or dbcAMP (1 mM) for 48 h. Quantitation of promoter activity was performed using a luciferase reporter assay. *P < 0.05 t-test, n = 6.