These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Activation of phospholipase A2 in 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine liposomes containing lipid ozonation products.
    Author: Salgo MG, Squadrito GL, Pryor WA.
    Journal: Chem Res Toxicol; 1994; 7(3):458-62. PubMed ID: 8075380.
    Abstract:
    The activation of phospholipase A2 (PLA2) by lipid ozonation products is reported. The principal products from the ozonation of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) are 1-palmitoyl-2-[8-[3(5-octyl-1,2,4-trioxolan-3-yl)octanoyl]--sn-gly cero-3- phosphocholine (PC-Criegee ozonide) and 1-palmitoyl-2-(9-oxononanoyl)-sn-glycero-3- phosphocholine (PC-aldehyde). (See Figure 1 for structures.) Here we test the hypothesis that these two compounds are mediators of ozone toxicity. Using POC vesicles, we find that PLA2 recognizes and hydrolyzes PC-Criegee ozonide at the same rate as that of arachidonic acid. Although the PC-aldehyde is not a substrate for PLA2, the enzymatic rate of hydrolysis by PLA2 of unaltered fatty acids incorporated into POPC is enhanced when PC-aldehyde is present in the bilayer. Thus, both PC-Criegee ozonide and PC-aldehyde alter the activity of PLA2, perhaps via an effect on membrane packing order. The capacity of PLA2 to recognize the PC-Criegee, and therefore ozone-induced damage, suggests a detoxification property of the enzyme and also a role in maintaining the structural properties of bilayer membranes that have been altered by exposure to ozone.
    [Abstract] [Full Text] [Related] [New Search]