Fig. 5.
4-OHT-induced IGFBP-1 transcription and inhibition of IGF-1 stimulation is decreased after GPER1 knockdown in MCF-7 cells. (A) Relative IGFBP-1 gene transcription determined by quantitative real-time PCR in GPER1 knockdown and non-targeting control cells (NT) after 24 hours of treatment with vehicle or 1μM 4-OHT. (B) Immunoblot analysis p-IGF-1R, p-AKT and p-ERK1/2 after IGF-1 stimulation in control and GPER1 knockdown MCF-7 cells. (C) MCF-7 cell viability after treatment with 1μM 4-OHT with and without 1μM G36 treatment. *, p<0.05 compared to vehicle and #, p<0.05 compared to G36- treated sample. The results are representative of three independent experiments, and the error bars are SEM.