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Properties of prostacyclin synthase

V Ullrich, R Brugger, F Lottspeich

    Advances in Experimental Medicine and Biology
    |January 1, 1997
    PubMed
    Summary

    Researchers purified prostacyclin synthase (PGIS), a heme-thiolate enzyme, from bovine aorta. Interleukin-1 treatment increased PGIS levels and activity in endothelial cells, indicating its role in regulating prostacyclin production.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Prostacyclin synthase (PGIS) is crucial for prostacyclin production, a key mediator of vascular homeostasis.
    • Understanding PGIS regulation is vital for cardiovascular research.

    Purpose of the Study:

    • To isolate and characterize homogeneous prostacyclin synthase (PGIS) from bovine aortic microsomes.
    • To investigate the regulation of PGIS expression and activity in endothelial cells.

    Main Methods:

    • Detergent solubilization and multi-step chromatography (DEAE-Sephacel, immobilized metal affinity, hydroxyapatite) for PGIS purification.
    • Peptide sequencing, antiserum preparation, Western blotting, and ELISA for PGIS analysis.
    • Interleukin-1 (IL-1) treatment of cultured endothelial cells to assess enzyme activity and mass changes.

    Main Results:

    • Homogeneous PGIS (52 kDa) with heme-thiolate protein characteristics was isolated.
    • IL-1 treatment significantly increased endothelial cell 6-keto-PGF1 alpha production (about threefold) over 27 hours.
    • Increased PGIS mass correlated with enhanced enzyme activity following IL-1 stimulation.
    • A monoclonal antibody-based ELISA was developed for PGIS quantitation in bovine tissues.

    Conclusions:

    • Bovine aortic PGIS is a 52 kDa heme-thiolate protein.
    • IL-1 induces increased PGIS expression and activity in endothelial cells, enhancing prostacyclin synthesis.
    • The developed tools facilitate further investigation into PGIS function and regulation in vascular biology.

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