RORα inhibits cell proliferation and expression of the E2F1-targeted genes. RORα inhibits cell proliferation and expression of the E2F1-targeted genes.

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RORα inhibits cell proliferation and expression of the E2F1-targeted genes. RORα inhibits cell proliferation and expression of the E2F1-targeted genes. (A) RORα expression was assessed by Western blotting in breast cancer cells infected with lentivirus containing the RORα-expressing construct. (B) Cell proliferation in control and RORα-expressing breast cancer cells was analyzed by EdU staining. Cells were cultured in 3D Matrigel. RORα expression inhibited cell proliferation in MDA-MB 157 and MDA-MB 231 cells (n = 3; *, P < 0.05; **, P < 0.01). (C) Control or RORα-expressing T4 cells or MDA-MB 231 cells were injected into the mammary fat pad in SCID mice. Restoring RORα expression in T4 cells or MDA-MB 231 cells inhibited tumor growth (n = 6; *, P < 0.05; **, P < 0.01). (D) Cell proliferation was examined by Ki67 staining in tumors formed by control or RORα-expressing T4-2 and MDA-MB 231 cells. The bar graph shows the Ki67 positivity ratio (n = 3; **, P < 0.01). (E) Gene set enrichment analysis (GSEA) identified the gene set “CELL CYCLE_KEGG” to be enriched among genes that show a reduced expression in RORα-expressing cells (P = 0.094). (F) GSEA analysis showed that the gene set “E2F1_Q6_01” had reduced expression in RORα-expressing breast cancer cells. (G) Heat map showing that E2F1 target genes were downregulated in RORα-expressing breast cancer cells compared with control cells. (H) Cell cycle progression in control and RORα-expressing cells was examined by flow cytometry analysis. The percentage of cells in G1 phase was significantly increased, while that of cells in S phase was significantly decreased in RORα-expressing MDA-MB 231 cells (n = 3; *, P < 0.05). (I) The top portion shows silencing efficiency of shRORα in S1 cells, examined by Western blotting. The bottom portion shows cell proliferation in control and shRORα-expressing S1 cells, analyzed by EdU staining. Cells were cultured in 3D Matrigel. Knockdown of RORα expression increased cell proliferation in S1 cells (n = 2; *, P < 0.05). (J) Cell cycle progression was analyzed by flow cytometry in control and RORα-silenced S1 cells. The percentage of cells in G1 phase was significantly decreased, while the percentages of cells in S phase and G2 phase were significantly increased in RORα-silenced cells compared with control cells (n = 3; *, P < 0.05). Gaofeng Xiong, and Ren Xu Mol. Cell. Biol. 2014;34:3066-3075