Abstract
Pro-inflammatory and anti-inflammatory mediators derived from arachidonic acid (AA) modulate peripheral inflammation and its resolution. Aspirin (ASA) is a unique non-steroidal anti-inflammatory drug, which switches AA metabolism from prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) to lipoxin A4 (LXA4) and 15-epi-LXA4. However, it is unknown whether chronic therapeutic doses of ASA are anti-inflammatory in the brain. We hypothesized that ASA would dampen increases in brain concentrations of AA metabolites in a rat model of neuroinflammation, produced by a 6-day intracerebroventricular infusion of bacterial lipopolysaccharide (LPS). In rats infused with LPS (0.5 ng/h) and given ASA-free water to drink, concentrations in high-energy microwaved brain of PGE2, TXB2 and leukotriene B4 (LTB4) were elevated. In rats infused with artificial cerebrospinal fluid, 6 weeks of treatment with a low (10 mg/kg/day) or high (100 mg/kg/day) ASA dose in drinking water decreased brain PGE2, but increased LTB4, LXA4 and 15-epi-LXA4 concentrations. Both doses attenuated the LPS effects on PGE2, and TXB2. The increments in LXA4 and 15-epi-LXA4 caused by high-dose ASA were significantly greater in LPS-infused rats. The ability of ASA to increase anti-inflammatory LXA4 and 15-epi-LXA4 and reduce pro-inflammatory PGE2 and TXB2 suggests considering aspirin further for treating clinical neuroinflammation.
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Abbreviations
- AA:
-
Arachidonic acid
- aCSF:
-
Artificial cerebrospinal fluid
- COX:
-
Cyclooxygenase
- ELISA:
-
Enzyme-linked immunosorbent assay
- HETE:
-
Hydroxyeicosatetraenoic acid
- icv:
-
Intracerebroventricular
- IL:
-
Interleukin
- LPS:
-
Lipopolysaccharide
- LT:
-
Leukotriene
- LXA4 :
-
Lipoxin A4
- 15-epi-LXA4 :
-
15-epimeric-lipoxin A4
- LOX:
-
Lipoxygenase
- PLA2 :
-
Phospholipase A2
- cPLA2 :
-
Cytosolic PLA2
- sPLA2 :
-
Secretory PLA2
- PGE2 :
-
Prostaglandin E2
- TXB2 :
-
Thromboxane B2
- NSAID:
-
Non-steroidal anti-inflammatory drug
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Acknowledgments
This work was supported entirely by the Intramural Research Program of the National Institute on Aging, NIH. None of the authors has a financial or other conflict of interest related to this work.
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An erratum to this article is available at http://dx.doi.org/10.1007/s11064-015-1583-4.
This article has been retracted on request of the Editor-in-Chief. The National Institutes of Health (NIH) has found that Dr. Mireille Basselin engaged in research misconduct by fabricating and/or falsifying data in "Basselin M, Ramadan E, Chen M, Rapoport SI, Anti-inflammatory effects of chronic aspirin on brain arachidonic acid metabolites. Neurochemical Research 36 (1) 139-145, 2011." Figure 2 A-E was falsified. Please note, none of the other authors are implicated in any way. Each of the co-authors of the manuscript has agreed to this retraction.
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Basselin, M., Ramadan, E., Chen, M. et al. RETRACTED ARTICLE: Anti-Inflammatory Effects of Chronic Aspirin on Brain Arachidonic Acid Metabolites. Neurochem Res 36, 139–145 (2011). https://doi.org/10.1007/s11064-010-0282-4
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DOI: https://doi.org/10.1007/s11064-010-0282-4