Figure 3From: Betulinic acid inhibits colon cancer cell and tumor growth and induces proteasome-dependent and -independent downregulation of specificity proteins (Sp) transcription factors BA inhibits luciferase activity in RKO cells transfected with GC-rich constructs. Transfection with constructs containing Sp1 (A), Sp3 (B) and Sp-regulated (C) gene promoter constructs. RKO cells were transfected with the indicated constructs, treated with DMSO or BA, and luciferase activity (normalized to β-galactosidase) was determined as described in the Materials and Methods. Results are expressed as means ± SE for at least 3 replicated determinations as significant (p < 0.05) is indicated (*).Back to article page