Transformation of prostaglandin D2 to 9 alpha, 11 beta-(15S)-trihydroxyprosta-(5Z,13E)-dien-1-oic acid (9 alpha, 11 beta-prostaglandin F2): a unique biologically active prostaglandin produced enzymatically in vivo in humans

Proc Natl Acad Sci U S A. 1985 Sep;82(18):6030-4. doi: 10.1073/pnas.82.18.6030.

Abstract

In vitro studies examining the metabolic transformation of prostaglandin D2 (PGD2) by human liver were conducted. PGD2 was found to be converted by a NADPH-dependent enzyme in the 100,000 X g supernatant of human liver exclusively to a single more polar compound that had a mass spectrum essentially the same as that of prostaglandin F2 alpha (PGF2 alpha). However, this compound could be chromatographically separated from PGF2 alpha and failed to form a butylboronate derivative. The structure of this compound was established as 9 alpha, 11 beta-(15S)-trihydroxyprosta-(5Z, 13E)-dien-1-oic acid (9 alpha, 11 beta-PGF2) by comparison of its chromatographic and mass spectral characteristics with authentic 9 alpha, 11 beta-PGF2. This compound was found to be biologically active by demonstrating increases in blood pressure in rats in a dose-related fashion following intravenous administration. By using a mass spectrometric assay, levels of this compound in plasma and urine from a normal volunteer were 6 pg/ml and 982 ng/24 hr, respectively. In a patient with systemic mastocytosis associated with overproduction of PGD2, urinary excretion of 9 alpha, 11 beta-PGF 2 was 6634 ng/24 hr and a circulating plasma level as high as 490 ng/ml was found during a severe episode of systemic mast cell activation. 9 alpha, 11 beta-PGF2 is structurally a unique prostaglandin, is enzymatically formed, is produced in vivo in humans, and is biologically active.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Blood Pressure / drug effects
  • Dinoprost
  • Humans
  • Liver / metabolism*
  • Mass Spectrometry
  • Prostaglandin D2
  • Prostaglandins D / metabolism*
  • Prostaglandins F / biosynthesis*
  • Prostaglandins F / blood
  • Prostaglandins F / pharmacology
  • Prostaglandins F / urine

Substances

  • Prostaglandins D
  • Prostaglandins F
  • Dinoprost
  • Prostaglandin D2