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15-PGDH (15-hydroxyprostaglandin dehydrogenase (NAD+)) is responsible for prostaglandin inactivation and supports the regulation of functions that are controled by prostaglandin levels. Specifically, 15PGDH catalyzes the chemical reaction to convert NAD+ to NADH and H+.
15-PGDH is a novel tumor suppressor in the COX-2 pathway. 15-PGDH is found in many normal tissues and appears to be down-regulated in colorectal and lung carcinoma tissue.