13,14-dihydro-15-keto Prostaglandin D2 (Synonyms: 13,14-dihydro-15-keto PGD2)

13,14-dihydro-15-keto Prostaglandin D2 (13,14-dihydro-15-keto PGD2) is a metabolite of PGD2 which is formed through the 15-hydroxy PGDH pathway. 13,14-dihydro-15-keto PGD2 was recently identified as a selective agonist for the CRTH2/DP2 receptor.[1] It also inhibits ion flux in a canine colonic mucosa preparation. [2]  In humans, 13,14-dihydro-15-keto PGD2 is further metabolized to give 11β-hydroxy compounds which have also undergone β-oxidation of one or both side chains. Virtually no 13,14-dihydro-15-keto PGD2 survives intact in the urine.[3] [4]

Reference:
[1]. Rangachari, P.K., and Betti, P.A. Biological activity of metabolites of PGD2 on canine proximal colon. Am. J. Physiol. 264(5 Pt 1), G886-G894 (1993).
[2] Hirai, H., Tanaka, K., Yoshie, O., et al. Prostaglandin D2 selectivity induces chemotaxis in T helper type 2 cells, eosinophils, and basophils via seven-transmembrane receptor CRTH2. J. Exp. Med. 193(2), 255-261 (2001).
[3]. Liston, T.E., and Roberts, L.J., II. Metabolic fate of radiolabeled prostaglandin D2 in a normal human male volunteer. J. Biol. Chem. 260(24), 13172-13180 (1985).
[4]. Morrow, J.D., Prakash, C., Awad, J.A., et al. Quantification of the major urinary metabolite of prostaglandin D2 by a stable isotope dilution mass spectrometric assay. Anal. Biochem. 193(1), 142-148 (1991).