Synthesis, structural identification and biological activity of 11,12-dihydroxyeicosatetraenoic acids formed in human platelets

Pär Westlund, Jan Palmblad, J R Falck, Sun Lumin

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

An enantiospecific route for the synthesis of 11,12-dihydroxyeicosatetraenoic acids was developed and used to synthesize 11,12-dihydroxy-5(Z),7(E),9(E),14(Z)-eicosatetraenoic acids. The 11,12-DHETEs were synthesized with the stereochemistry of the hydroxyl group being 11(R),12(S) and 11(S),12(S). The synthetic compounds were used to elucidate the structure of 11,12-DHETEs formed in human platelets by comparison of the chromatographic retention time in HPLC and GC as well as their ion fragmentation pattern in GC-MS. The major 11,12-DHETE formed in human platelets was found to be identical with 11(R),12(S)-dihydroxy-5(Z),7(E),9(E),14(Z)-eicosatetraenoic acid. Two more compounds were tentatively identified as 11(S),12(S)-dihydroxy-5(Z),7(E),9(E),14(Z)-eicosatetraenoic acid and 11,12-dihydroxy-5(E),7(E),9(E),14(Z)-eicosatetraenoic acid. Furthermore, the 11(S),12(S)-dihydroxy-5(Z),7(E),9(E),14(Z)-eicosatetraenoic acid was found to possess biological activity on neutrophil functional responses. However, the major compound, 11(R),12(S)-dihydroxy-5(Z),7(E),9(E),14(Z)-eicosatetraenoic acid, formed in platelets lacks biological activity in the test systems used. The present data further support that 11,12-dihydroxy-eicosatetranoic acids are formed in human platelets via a leukotriene like mechanism presumably by the 12-lipoxygenase. Furthermore, the biological effects of one of the compounds showed a unique activity profile compared to other lipoxygenase products.

Original languageEnglish (US)
Pages (from-to)301-307
Number of pages7
JournalBiochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism
Volume1081
Issue number3
DOIs
StatePublished - Feb 5 1991

Keywords

  • (Human platelet)
  • 11,12-dihydroxyeicosatetraenoic acid
  • Arachidonic acid
  • Leukotriene
  • Structure determinatino

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Endocrinology

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