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• W2022007704 abstract "Recent studies have shown a correlation between 5-lipoxygenase (5-LO) pathway up-regulation and cardiovascular risk. Despite the existence of several assays for products of the 5-LO pathway, a reliable method for clinical determination of 5-LO activity remains to be established. In the present communication, we report conditions that allow measurement of 5-hydroxyeicosatetraenoic acid (5-HETE) and leukotriene B4 (LTB4) in peripheral blood mononuclear cells (PBMCs) isolated from the blood of atherosclerosis patients before and after stimulation by the calcium ionophore, A23187. LTB4, a potent mediator of inflammation-linked cardiovascular disease, was measured using an existing competitive enzyme immunoassay (EIA) kit after making specific methodological improvements that allowed PBMCs to be used in this format for the first time. LTB4 was also measured by LC/MS/MS along with 5-HETE, a direct by-product of the action of 5-LO on arachidonic acid and a molecule for which no commercial EIA kit exists. The LC/MS/MS assay was validated over a range of 0.025–25 ng/mL for LTB4 and 0.1–25 ng/mL for 5-HETE. The EIA method has a validated range covering 0.025–4 ng/mL. When both assays were applied to analyze LTB4 from stimulated PBMCs isolated from 25 subjects with various degrees of atherosclerosis, a high correlation was obtained (r = 0.9426, Pearson's correlation coefficient). A high correlation was also observed between the levels of LTB4 and 5-HETE measured by LC/MS/MS after ionophore stimulation (r = 0.9159). Details are presented for optimized sample collection, processing, storage, and analysis in accordance with the logistical demands of clinical analysis." @default.
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• W2022007704 date "2008-12-01" @default.
• W2022007704 modified "2023-10-18" @default.
• W2022007704 title "The development of methodology for clinical measurement of 5-lipoxygenase pathway intermediates from human peripheral blood mononuclear cells" @default.
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• W2022007704 doi "https://doi.org/10.1016/j.jpba.2008.09.034" @default.
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