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

Search MEDLINE/PubMed


  • Title: Chemotactic 5-oxo-icosatetraenoic acids activate a unique pattern of neutrophil responses. Analysis of phospholipid metabolism, intracellular Ca2+ transients, actin reorganization, superoxide-anion production and receptor up-regulation.
    Author: Norgauer J, Barbisch M, Czech W, Pareigis J, Schwenk U, Schröder JM.
    Journal: Eur J Biochem; 1996 Mar 15; 236(3):1003-9. PubMed ID: 8665888.
    Abstract:
    Neutrophil cell responses and signal pathways elicited by the chemotactic arachidonic acid metabolites (6E, 8Z, 11Z, 14Z)-5-oxo-icosatetraenoic acid and (6E, 8Z, 11Z, 13E)-5-oxo-15-hydroxy-icosatetraenoic acid were studied and compared with those of other chemotaxins. Polyphosphoinositol lipid analysis revealed activation of phosphatidylinositol-biphosphate 3-kinase by both agonists. Experiments with Fura-2 in the presence of EGTA indicated Ca2+ mobilization from intracellular stores by both 5-oxo-icosanoids. A transient actin response and production of small amounts of superoxide anions upon stimulation with both agents was detected. The changes induced by 5-oxo-icosanoids were more moderate and transient than those obtained by other chemotaxins. Desensitization studies indicated cross-desensitization between both 5-oxo-icosanoids, but no interference with the response of other chemotaxins. All cell responses elicited by 5-oxo-icosanoids at concentrations 500-fold higher than the ED50 of other functions did not induce up-regulation of CD11b and N-formyl-peptide receptors at the cell surface, and failed to potentiate N-formyl-peptide-induced superoxide anion production. These results indicate that 5-oxo-icosanoids trigger a unique pattern of neutrophil responses.
    [Abstract] [Full Text] [Related] [New Search]