Regulation of prostaglandin transporters in colorectal neoplasia

Cancer Prevention Research
Vijaykumar R HollaRaymond N DuBois

Abstract

Prostaglandin E(2) (PGE(2)) promotes cancer progression by affecting cell proliferation, apoptosis, angiogenesis, and the immune response. It has been reported that PGE(2) is transported or passes through the cell membrane via prostaglandin-specific transporters including the prostaglandin transporter (PGT, an influx transporter) and the multidrug resistance-associated protein 4 (an efflux transporter). PGT can facilitate the removal of PGE(2) from the extracellular milieu by transporting it into the cell, where 15-hydroxyprostaglandin dehydrogenase (15-PGDH) then oxidizes PGE(2) into 15-keto PGE(2). We previously reported that 15-PGDH expression is reduced in most colorectal cancers, indicating the tumor suppressor role of this gene. In the present study, we show that PGT expression is also decreased (whereas multidrug resistance-associated protein 4 expression is elevated) in human colorectal cancer specimens (compared with expression in normal mucosa) and in colorectal cancer cell lines. Furthermore, we found that PGT expression decreased in premalignant adenomas in APC(min) mice and was partially restored (in human colorectal cancer cell lines) by treatment with a DNA demethylating agent or histone deacetylase inhibitor. Fo...Continue Reading

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