Figure 5.
Pioglitazone induces 15-PGDH and BRCA1, and suppresses aromatase levels in mouse mammary gland. Mice were fed control diet or control diet supplemented with 0.05% or 0.1% (w/w) pioglitazone for 2 weeks before being sacrificed. Levels of aromatase activity (A), aromatase mRNA (B), 15-PGDH mRNA (C), PGE2 (D) 13,14-dihydro-15-keto PGE2 (E), and BRCA1 mRNA (F) were measured in mammary glands. A, aromatase activity is expressed as femtomoles/μg protein/h. Total RNA was prepared and aromatase (B), 15-PGDH (C), and BRCA1 (F) mRNA levels were quantified by real-time PCR. D and E, PGE2 and 13,14-dihydro-15-keto-PGE2 levels were measured in mammary glands. The biomarker levels under each experimental condition (n = 10) were summarized in terms of mean ± SD ■, P < 0.1; *, P < 0.05; **, P < 0.01; ***, P < 0.001 versus mice that received control diet.