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Yan, M. et al.

15-Hydroxyprostaglandin dehydrogenase, a COX-2 oncogene antagonist, is a TGF-beta-induced suppressor of human gastrointestinal cancers.

Marked increased expression of cyclooxygenase 2 ( COX-2), a prostaglandin-synthesizing enzyme that is pharmacologically inhibited by nonsteroid anti-inflammatory-type drugs, is a major early oncogenic event in the genesis of human colon neoplasia. We report that, in addition to inducing expression of COX-2, colon cancers further target the prostaglandin biogenesis pathway by ubiquitously abrogating expression of 15-hydroxyprostaglandin dehydrogenase (15-PGDH), a prostaglandin-degrading enzyme that physiologically antagonizes COX-2. We find that 15-PGDH transcript and protein are both highly expressed by normal colonic epithelia but are nearly undetectable in colon cancers. Using gene transfection to restore 15-PGDH expression in colon cancer cells strongly inhibits the ability of these cells to form tumors in immune-deficient mice and demonstrates 15-PGDH to have functional colon cancer tumor suppressor activity. In interrogating the mechanism for 15-PGDH expression loss in colon cancer, we determined that colonic 15-PGDH expression is directly controlled and strongly induced by activation of the TGF-beta tumor suppressor pathway. These findings thus delineate an enzymatic pathway that induces colon cancer suppression, a pathway that is activated by TGF-beta and mediated by 15-PGDH.[1]

References

15-Hydroxyprostaglandin dehydrogenase, a COX-2 oncogene antagonist, is a TGF-beta-induced suppressor of human gastrointestinal cancers. Yan, M., Rerko, R.M., Platzer, P., Dawson, D., Willis, J., Tong, M., Lawrence, E., Lutterbaugh, J., Lu, S., Willson, J.K., Luo, G., Hensold, J., Tai, H.H., Wilson, K., Markowitz, S.D. Proc. Natl. Acad. Sci. U.S.A. (2004) [Pubmed]

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