Hematopoietic prostaglandin (PG) D synthase (H-PGDS) is known as key enzyme in the production of PGD 2 and its J series metabolite, 15-deoxy-∆ 12, 14 -PGJ 2 (15d-PGJ 2 ), is thought to play an important role for anti-inflammatory effects. Anti-tumor effects of 15d-PGJ 2 has been shown to be involved in both peroxisome proliferator-activated receptor (PPAR) γ independent and dependent pathways. The independent pathway includes the repression of the telomerase reverse transcriptase (TERT) and cyclooxygenase (COX)-2 via the down-regulation of NFκB. The dependent pathway included repression of the vascular endothelial growth factor (VEGF) receptors and COX-2 with down-regulation of NFκB, followed by the activation of PPAR γ.In this review, we focused on the role of 15d-PGJ 2 in anti-tumor effects including our evaluation in mouse bladder carcinoma model.
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