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Prostaglandin Extraction and Analysis in Caenorhabditis elegans
08:50

Prostaglandin Extraction and Analysis in Caenorhabditis elegans

Published on: June 25, 2013

Polymorphic human prostaglandin H synthase-2 proteins and their interactions with cyclooxygenase substrates and

W Liu1, E M Poole, C M Ulrich

  • 1Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, TX 77030, USA.

The Pharmacogenomics Journal
|June 16, 2010
PubMed

Insights

Certain genetic variations in prostaglandin H synthase-2 (PGHS-2), specifically E488G and V511A, affect its cyclooxygenase (COX) activity. These PGHS-2 variants may predict individual responses to nonsteroidal anti-inflammatory drugs (NSAIDs) and n-3 fatty acids.

Area of Science:

  • Biochemistry
  • Genetics
  • Pharmacology

Background:

  • Prostaglandin H synthase-2 (PGHS-2) cyclooxygenase (COX) activity is linked to colorectal cancer.
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) and dietary n-3 fatty acids target PGHS-2 activity.

Purpose of the Study:

  • To investigate the functional effects of specific PGHS-2 polymorphisms (R228H, E488G, V511A, G587R) on COX activity, fatty acid selectivity, and NSAID interactions.

Main Methods:

  • Utilized purified, recombinant proteins to assess PGHS-2 variants.
  • Measured COX activity with arachidonate and fatty acid selectivity.
  • Evaluated time-dependent inhibition by the COX-2 inhibitor nimesulide and other inhibitors.

Main Results:

  • The E488G variant showed ~20% lower COX activity with arachidonate, while V511A showed ~20% higher activity.
  • Both E488G and V511A exhibited 30-60% higher residual COX activity after nimesulide inhibition; V511A showed up to 70% higher residual activity with other inhibitors.
  • E488G and V511A displayed altered fatty acid selectivity, with E488G showing less discrimination against eicosapentaenoic acid and V511A showing more.

Conclusions:

  • The E488G and V511A PGHS-2 polymorphisms significantly alter COX activity, fatty acid selectivity, and NSAID response.
  • These specific PGHS-2 variants may serve as predictive biomarkers for therapeutic efficacy of certain NSAIDs and n-3 fatty acid interventions.

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