Activation of the Arachidonate 5‐Lipoxygenase Pathway in the Canine Basilar Artery After Experimental Subarachnoidal Hemorrhage
- 5 October 1988
- journal article
- Published by Wiley in Journal of Neurochemistry
- Vol. 51 (4), 1126-1131
- https://doi.org/10.1111/j.1471-4159.1988.tb03077.x
Abstract
Severe cerebral vasospasm as confirmed by an‐giography was induced in dogs by injection of autologous blood into the cisterna magna, and the resultant leukotriene formation in the isolated basilar artery was examined. When stimulated with calcium ionophore (A 23187), the arteries of the treated animals produced a significant amount of leu‐kotrienes B4 (85 ± 12 pmol/mg protein, n = 3) and C4 (72 ± 14 pmol/mg), in addition to 5(S)‐hydroxy‐6,8,l 1,14‐ei‐cosatetraenoic acid. Structural elucidations of these metabolites were performed by radioimmunoassays or gas chro‐matography‐mass spectrometry, following purification with HPLC. The artery of the untreated dog produced none of these compounds from either exogenous or endogenous ar‐achidonic acid, under stimulation with the calcium ionophore. However, the homogenates from both animals converted exogenous leukotriene A4 to leukotrienes B4 and C4. These observations suggest that the normal basilar artery contains no detectable amount of 5‐lipoxygenase, and that a prominent activation of this enzyme occurred (2.1 nmol 5‐HETE/5 min/mg of protein) after subarachnoidal hemorrhage. The observation that fatty acid hydroperoxides stimulated the 5‐lipoxygenase activity indicates a possible role of lipid peroxides in the development of vasospasm.Keywords
This publication has 26 references indexed in Scilit:
- Participation of Lipoxygenase Products from Arachidonic Acid in the Pathogenesis of Cerebral VasospasmJournal of Neurochemistry, 1988
- Leukotrienes and Lipoxins: Structures, Biosynthesis, and Biological EffectsScience, 1987
- Lipoxygenase metabolites of arachidonic acid as second messengers for presynaptic inhibition of Aplysia sensory cellsNature, 1987
- Enzymic Synthesis of Leukotriene B4 in Guinea Pig BrainJournal of Neurochemistry, 1987
- Leukotriene production in gerbil brain after ischemic insult, subarachnoid hemorrhage, and concussive injuryJournal of Neurosurgery, 1985
- The biologically active leukotrienes. Biosynthesis, metabolism, receptors, functions, and pharmacology.JCI Insight, 1984
- Eicosanoids: Prostaglandins, Thromboxanes, Leukotrienes, and Other Derivatives of Carbon‐20 Unsaturated Fatty AcidsJournal of Neurochemistry, 1982
- Evaluation of prostaglandin biosynthetic activity in canine basilar artery following subarachnoid injection of bloodJournal of Neurosurgery, 1981
- A Rapid and Sensitive Method for the Quantitation of Microgram Quantities of Protein Utilizing the Principle of Protein-Dye BindingAnalytical Biochemistry, 1976
- A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye bindingAnalytical Biochemistry, 1976