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• W2142230808 endingPage "3523" @default.
• W2142230808 startingPage "3515" @default.
• W2142230808 abstract "The 5-lipoxygenase (5LO) produces leukotriene B(4) and 15-epilipoxin-A(4) (15-epi-LXA(4)). Phosphorylation at Ser(523) by protein kinase A (PKA) prevents 5LO shift to the perinuclear membrane. Atorvastatin and pioglitazone up-regulate 15-epi-LXA(4) production in the heart. We assessed whether phosphorylation of 5LO by PKA determines whether 5LO interacts with the membranous cytosolic phospholipase A(2) (cPLA(2)) to produce leukotriene B(4) or with cyclooxygenase-2 (COX2) to produce 15-epi-LXA(4). Rats received either pioglitazone, atorvastatin, pioglitazone plus atorvastatin, vehicle, or LPS. Rat myocardial cells were incubated with pioglitazone plus atorvastatin, pioglitazone plus atorvastatin plus H-89 (PKA inhibitor), H-89, or vehicle for 8 h. Pioglitazone and atorvastatin did not affect total 5LO expression. However, both increased 5LO levels in the cytosolic fraction. H-89 caused a shift of 5LO to the membranous fraction in atorvastatin- and pioglitazone-treated rats. Pioglitazone and atorvastatin increased phospho-5LO levels. H-89 attenuated this increase. Both pioglitazone and atorvastatin increased COX2 levels in the cytosolic fraction and the membranous fraction. H-89 prevented this increase. Pioglitazone and atorvastatin increased cPLA(2) expression in the membranous fraction. This effect was not attenuated by H-89. Pioglitazone plus atorvastatin increased 15-epi-LXA(4) levels. H-89 attenuated the effect of pioglitazone plus atorvastatin. Pioglitazone plus atorvastatin plus H-89 increased leukotriene B(4) levels. Coimmunoprecipitation showed that without H-89, atorvastatin and pioglitazone induced an interaction between 5LO and COX2 in the cytosolic fraction, whereas when H-89 was added, 5LO interacted with cPLA(2) on the membranous fraction. The 5LO phosphorylation determines whether 15-epi-LXA(4) (anti-inflammatory) or leukotriene B(4) (inflammatory mediator) is produced." @default.
• W2142230808 created "2016-06-24" @default.
• W2142230808 creator A5037680235 @default.
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• W2142230808 creator A5082014779 @default.
• W2142230808 creator A5082904394 @default.
• W2142230808 creator A5090058992 @default.
• W2142230808 date "2008-09-01" @default.
• W2142230808 modified "2023-10-05" @default.
• W2142230808 title "Phosphorylation of 5-Lipoxygenase at Ser523 by Protein Kinase A Determines Whether Pioglitazone and Atorvastatin Induce Proinflammatory Leukotriene B4 or Anti-Inflammatory 15-Epi-Lipoxin A4 Production" @default.
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• W2142230808 doi "https://doi.org/10.4049/jimmunol.181.5.3515" @default.
• W2142230808 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18714024" @default.
• W2142230808 hasPublicationYear "2008" @default.
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