Figure 7. Functional Roles of Collaborating Transcription Factors in Mediating the PDE9A Gene Transcription and Prostate Cancer Cell Proliferation.
(A) AR binding sites relative to the PDE9A gene. The black blocks represent AR binding sites. The PDE9A gene is shown in its 5′-3′ orientation, and the blue arrows indicate the direction of the gene (June 05, University of California, Santa Cruz [UCSC], known genes).
(B) Effects of FoxA1, GATA2, and Oct1 silencing on PDE9A mRNA expression. siRNA-RTPCR analyses were performed as described in Figure 6B.
(C) Effects of silencing GATA2 and Oct1 on AR, Pol II, Oct1, and GATA2 recruitment to the PDE9A enhancers. siRNA-ChIP analyses were performed as described in Figure 6C.
(D) Effects of AR and cofactor silencing on androgen-stimulated cell cycle entry. Forty-eight hours after siRNA transfection, cells were treated with or without 1 or 10 nM DHT for 24 hr. Cells were then fixed, stained with propidium iodide, and analyzed by flow cytometry. Values represent the mean ± SE of two to three independent experiments (B) to (D).