Abstract
Eicosanoids and other oxylipins are oxygenation products from polyunsaturated fatty acids (PUFA). They can be formed non-enzymatically by (lipid) autoxidation as well as by specific enzymatic reactions. In mammals, enzymatic formation comprises three main pathways catalyzed by cyclooxygenases (COX), lipoxygenases (LOX), and cytochrome P450 monooxygenases (CYP). Several of the oxylipins are highly potent lipid mediators, playing a key role in the regulation of pain, fever, and inflammation. Thus, oxylipin formation is a major drug target. In fact, common pharmaceuticals being sold without a prescription, e.g., non-steroidal anti-inflammatory drugs (NSAID), directly target COX.
In this chapter, a detailed protocol is described to investigate oxylipin formation during autoxidation and upon an inflammatory stimulus in cell culture. The low-abundant lipid mediators are quantified by means of targeted liquid chromatography-tandem mass spectrometry (LC-MS/MS). The experiments demonstrate that oxylipins are markers of cell biology, reflecting the redox status/oxidative stress on the one hand and the cellular inflammatory response on the other.
Based on a selected set of oxylipins the students learn how to set up a quantitative LC-MS/MS method and apply it to biological samples. With the detailed protocol, cell culture experiments can be rapidly set up in the laboratory to investigate the effects of oxidative stress or inflammatory stimuli in cells. The strategy also allows to test new compounds for their efficacy to reduce oxidative stress or to alleviate proinflammatory lipid mediator formation. Thus, the described procedures facilitate the implementation of individual research projects in advanced practical student courses.
Overall, the experiments lead to a comprehensive understanding of quantitative LC-MS/MS as well as basic cell culture experiments to study the bioactivity of new compounds. The investigation and interpretation of the results enable to understand oxylipin formation and their role in biology.
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Abbreviations
- 4-HNE:
-
4-Hydroxy-2-nonenal
- ARA:
-
Arachidonic acid (C20:4 n6)
- BCA:
-
Bicinchoninic acid
- BHT:
-
Butylated hydroxytoluene
- CE:
-
Collision energy
- COX:
-
Cyclooxygenase
- CXP:
-
Collision cell exit potential
- CYP:
-
Cytochrome P450 monooxygenase
- DHA:
-
Docosahexaenoic acid (C22:6 n3)
- DiHETE:
-
Dihydroxy-eicosatetraenoic acid
- DiHETrE:
-
Dihydroxy-eicosatrienoic acid
- DMEM:
-
Dulbecco’s modified Eagle medium
- DMSO:
-
Dimethyl sulfoxide
- DP:
-
Declustering potential
- EDTA:
-
Ethylenediaminetetraacetic acid
- EP:
-
Entrance potential
- EPA:
-
Eicosapentaenoic acid (C20:5 n3)
- EpETrE:
-
Epoxy-eicosatrienoic acid
- ESI:
-
Electrospray ionization
- EtOH:
-
Ethanol
- FCS:
-
Fetal calf serum
- GIT:
-
Gastrointestinal tract
- HAc:
-
Acetic acid
- HETE:
-
Hydroxy-eicosatetraenoic acid
- HHT/HHTrE:
-
Hydroxy-heptadecatrienoic acid
- HpETE:
-
Hydroperoxy-eicosatetraenoic acid; hydroperoxy-ARA
- IC50:
-
Half maximal inhibitory concentration
- IS:
-
Internal standard
- IsoP:
-
Isoprostane
- KOH:
-
Potassium hydroxide
- LC:
-
Liquid chromatography
- LLOQ:
-
Lower limit of quantification
- LOD:
-
Limit of detection
- LOX:
-
Lipoxygenase
- LPS:
-
Lipopolysaccharide
- LT:
-
Leukotriene
- LTA4:
-
5S-Trans-5,6-oxido-7E,9E,11Z,14Z-eicosatetraenoic acid
- LTAH:
-
Leukotriene A4 hydrolase
- LTB4:
-
5S,12R-Dihydroxy-6Z,8E,10E,14Z-eicosatetraenoic acid
- m/z:
-
Mass-to-charge ratio
- MDA:
-
Malondialdehyde
- MeOH:
-
Methanol
- MRM:
-
Multiple reaction monitoring
- MS :
-
Mass spectrometry
- MS/MS:
-
Tandem mass spectrometry
- n3-PUFA:
-
Omega-3 polyunsaturated fatty acid
- n6-PUFA:
-
Omega-6 polyunsaturated fatty acid
- NSAID:
-
Non-steroidal anti-inflammatory drug
- PBS:
-
Phosphate buffered saline
- PCR:
-
Polymerase chain reaction
- PG:
-
Prostaglandin
- PGF2α:
-
9α,11α,15S-Trihydroxy-prosta-5Z,13E-dien-1-oic acid
- PUFA:
-
Polyunsaturated fatty acid
- ROOH:
-
Organic hydroperoxide
- RP:
-
Reversed-phase
- rpm:
-
Rounds per minute
- RPMI:
-
Roswell Park Memorial Institute (cell culture medium)
- RSD:
-
Relative standard deviation
- S/N:
-
Signal-to-noise ratio
- SD:
-
Standard deviation
- SPE:
-
Solid phase extraction
- SRM:
-
Selected reaction monitoring
- t-AUCB:
-
Trans-4-[4-(3-adamantan-1-yl-ureido)-cyclohexyloxy]-benzoic acid
- t-BOOH:
-
Tert-butyl hydroperoxide
- TGF-β1:
-
Transforming growth factor-β1
- tR:
-
Retention time
- TX:
-
Thromboxane
- ULOQ:
-
Upper limit of quantification
- UPLC:
-
Ultra-high-performance liquid chromatography
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Rund, K.M., Schebb, N.H. (2023). Quantitative Analysis of Eicosanoids and Other Oxylipins. In: Ivanisevic, J., Giera, M. (eds) A Practical Guide to Metabolomics Applications in Health and Disease. Learning Materials in Biosciences. Springer, Cham. https://doi.org/10.1007/978-3-031-44256-8_13
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