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Penner AL, Waytt V, Winter T, Leng S, Duhamel TA, Aukema HM. Oxylipin profiles and levels vary by skeletal muscle type, dietary fat and sex in young rats. Appl Physiol Nutr Metab 2021; 46:1378-1388. [PMID: 34115947 DOI: 10.1139/apnm-2021-0161] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Polyunsaturated fatty acids (PUFA)-derived bioactive lipid mediators called oxylipins have been shown to influence muscle growth, inflammation and repair in select muscles. Since individual oxylipins have varying effects and potencies, broad profiling in differing muscle types is required to further understand their overall effects. In addition, diet and sex are key determinants of oxylipin levels. Therefore, to provide comprehensive data on oxylipin profiles in rat soleus (SO), red gastrocnemius (RG), and white gastrocnemius (WG) muscles, female and male weanling Sprague-Dawley rats were provided control or experimental diets enriched in n-3 (ω-3) or n-6 (ω-6) PUFA for 6 weeks. Free oxylipin analysis by HPLC/MS/MS revealed that SO muscle had 25% more oxylipins and 4-13 times greater oxylipin mass than WG muscle. Dietary n-3 PUFA (α-linolenic acid, eicosapentaenoic acid, and docosahexaenoic acid) each increased n-3 oxylipins derived directly from their precursors and several that were not direct precursors, while reducing arachidonic acid derived oxylipins. Dietary linoleic acid had few effects on oxylipins. Oxylipins with a sex effect were higher in females in SO and RG. Oxylipins generally reflected the effects of diet and sex on PUFA, but there were exceptions. These fundamental oxylipin profile data provide groundwork knowledge and context for future research on muscle oxylipin functions. Novelty: Rat SO compared with RG and WG muscles have a higher number and greater mass of oxylipins. Oxylipins generally reflect diet effects on PUFA in all muscles, but there are notable exceptions. Oxylipins in SO and RG are higher in females.
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Affiliation(s)
- Avery L Penner
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, Manitoba, Canada
| | - Victoria Waytt
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, Manitoba, Canada
| | - Tanja Winter
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, Manitoba, Canada
| | - Shan Leng
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, Manitoba, Canada
| | - Todd A Duhamel
- Institute of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, Winnipeg, Manitoba, Canada
- Faculty of Kinesiology and Recreation Management, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Harold M Aukema
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, Manitoba, Canada
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Selma-Gracia R, Haros CM, Laparra Llopis JM. Inclusion of Salvia hispanica L. and Chenopodium quinoa into bread formulations improves metabolic imbalances derived from a high-fat intake in hyperglycaemic mice. Food Funct 2021; 11:7994-8002. [PMID: 32841309 DOI: 10.1039/d0fo01453b] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
High-energy intake causes imbalances in nutrient homeostasis contributing to a high prevalence of metabolic chronic diseases. The extent to what metabolic imbalances can be ameliorated by the inclusion of immunonutritional ingredients obtained from flours favouring nutrient and calorie management remains poorly understood. Herein, it is demonstrated that partial replacement of wheat flour (WB) with that from Chenopodium quinoa varieties [red (RQ, 25% w/w) and white (WQ, 25% w/w)] as well as from Salvia hispanica L., [whole (Ch, 20% w/w) and semi-defatted (Ch_D, 20% w/w)] in bread formulations ameliorates the metabolic and inflammation consequences of high-fat diet consumption in hyperglycaemic animals. Feeding animals with bread formulations replacing wheat flour effectively reduced insulin resistance (by 2-fold, HOMAir). The reduction in starch content did not appear as a determinant of controlling HOMAir. Only animals fed with RQ and Ch diet displayed increased plasma levels of triglycerides, which significantly contributed to mitigate HFD-induced hepatic lipid peroxidation. The latter was increased in animals receiving Ch_D diet, where PUFAs were eliminated from chia's flour. Feeding with WQ and Ch samples caused an upward trend in hepatic TNF-α and IL-6 levels. Despite similarities between immunonutritional agonists in animals fed with RQ and WQ, IL-17 levels were quantified higher for animals fed with WQ. All bread formulations except Ch_D samples significantly increased the hepatic granulocyte-monocyte colony stimulation factor levels. These results indicated that replacement of wheat flour with that from quinoa and chia improved the metabolic imbalances in hyperglycaemic animals.
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Affiliation(s)
- Raquel Selma-Gracia
- Molecular Immunonutrition Group, Madrid Institute for Advanced Studies in Food (IMDEA-Food), Ctra. de Canto Blanco n° 8, 28049 Madrid, Spain. and Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Av. Agustín Escardino 7, Parque Científico, 46980 Paterna, Valencia, Spain.
| | - Claudia Monika Haros
- Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Av. Agustín Escardino 7, Parque Científico, 46980 Paterna, Valencia, Spain.
| | - José Moisés Laparra Llopis
- Molecular Immunonutrition Group, Madrid Institute for Advanced Studies in Food (IMDEA-Food), Ctra. de Canto Blanco n° 8, 28049 Madrid, Spain.
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Vascular Lipidomic Profiling of Potential Endogenous Fatty Acid PPAR Ligands Reveals the Coronary Artery as Major Producer of CYP450-Derived Epoxy Fatty Acids. Cells 2020; 9:cells9051096. [PMID: 32365470 PMCID: PMC7290345 DOI: 10.3390/cells9051096] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/22/2020] [Accepted: 04/27/2020] [Indexed: 01/08/2023] Open
Abstract
A number of oxylipins have been described as endogenous PPAR ligands. The very short biological half-lives of oxylipins suggest roles as autocrine or paracrine signaling molecules. While coronary arterial atherosclerosis is the root of myocardial infarction, aortic atherosclerotic plaque formation is a common readout of in vivo atherosclerosis studies in mice. Improved understanding of the compartmentalized sources of oxylipin PPAR ligands will increase our knowledge of the roles of PPAR signaling in diverse vascular tissues. Here, we performed a targeted lipidomic analysis of ex vivo-generated oxylipins from porcine aorta, coronary artery, pulmonary artery and perivascular adipose. Cyclooxygenase (COX)-derived prostanoids were the most abundant detectable oxylipin from all tissues. By contrast, the coronary artery produced significantly higher levels of oxylipins from CYP450 pathways than other tissues. The TLR4 ligand LPS induced prostanoid formation in all vascular tissue tested. The 11-HETE, 15-HETE, and 9-HODE were also induced by LPS from the aorta and pulmonary artery but not coronary artery. Epoxy fatty acid (EpFA) formation was largely unaffected by LPS. The pig CYP2J homologue CYP2J34 was expressed in porcine vascular tissue and primary coronary artery smooth muscle cells (pCASMCs) in culture. Treatment of pCASMCs with LPS induced a robust profile of pro-inflammatory target genes: TNFα, ICAM-1, VCAM-1, MCP-1 and CD40L. The soluble epoxide hydrolase inhibitor TPPU, which prevents the breakdown of endogenous CYP-derived EpFAs, significantly suppressed LPS-induced inflammatory target genes. In conclusion, PPAR-activating oxylipins are produced and regulated in a vascular site-specific manner. The CYP450 pathway is highly active in the coronary artery and capable of providing anti-inflammatory oxylipins that prevent processes of inflammatory vascular disease progression.
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Ji X, Lyu P, Hu R, Yao W, Jiang H. Generation of an enteric smooth muscle cell line from the pig ileum. J Anim Sci 2020; 98:skaa102. [PMID: 32249920 PMCID: PMC7179811 DOI: 10.1093/jas/skaa102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 04/02/2020] [Indexed: 11/14/2022] Open
Abstract
Smooth muscle cells (SMCs) play an important role in physiology and production in farm animals such as pigs. Here, we report the generation of a pig SMC line. Our original objective was to establish an enteroendocrine cell line from the pig ileum epithelium through lentiviral transduction of the Simian Virus (SV) 40 large T antigen. However, an initial expression analysis of marker genes in nine cell clones revealed that none of them were enteroendocrine cells or absorptive enterocytes, goblet cells, or Paneth cells, some of the major cell types existing in the ileum epithelium. A more detailed characterization of one clone named PIC7 by RNA-seq showed that these cells expressed many of the known smooth muscle-specific or -enriched genes, including smooth muscle actin alpha 2, calponin 1, calponin 3, myosin heavy chain 11, myosin light chain kinase, smoothelin, tenascin C, transgelin, tropomyosin 1, and tropomyosin 2. Both quantitative PCR and RNA-seq analyses showed that the PIC7 cells had a high expression of mRNA for smooth muscle actin gamma 2, also known as enteric smooth muscle actin. A Western blot analysis confirmed the expression of SV40 T antigen in the PIC7 cells. An immunohistochemical analysis demonstrated the expression of smooth muscle actin alpha 2 filaments in the PIC7 cells. A collagen gel contraction assay showed that the PIC7 cells were capable of both spontaneous contraction and contraction in response to serotonin stimulation. We conclude that the PIC7 cells are derived from an enteric SMC from the pig ileum. These cells may be a useful model for studying the cellular and molecular physiology of pig enteric SMCs. Because pigs are similar to humans in anatomy and physiology, the PIC7 cells may be also used as a model for human intestinal SMCs.
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Affiliation(s)
- Xu Ji
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA
| | - Pengcheng Lyu
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA
| | - Rui Hu
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Wen Yao
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Honglin Jiang
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA
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Biliktu M, Senol SP, Temiz-Resitoglu M, Guden DS, Horat MF, Sahan-Firat S, Sevim S, Tunctan B. Pharmacological inhibition of soluble epoxide hydrolase attenuates chronic experimental autoimmune encephalomyelitis by modulating inflammatory and anti-inflammatory pathways in an inflammasome-dependent and -independent manner. Inflammopharmacology 2020; 28:1509-1524. [PMID: 32128702 DOI: 10.1007/s10787-020-00691-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 02/06/2020] [Indexed: 12/15/2022]
Abstract
We aimed to determine the effect of soluble epoxide hydrolase (sEH) inhibition on chronic experimental autoimmune encephalomyelitis (EAE), a murine model of multiple sclerosis (MS), associated with changes in inflammasome-dependent and -independent inflammatory and anti-inflammatory pathways in the CNS of mice. C57BL/6 mice were used to induce chronic EAE by using an injection of MOG35-55 peptide/PT. Animals were observed daily and scored for EAE signs for 25 days after immunization. Following the induction of EAE, the scores were increased after 9 days and reached peak value as determined by ≥ 2 or ≤ 3 with 8% mortality rate on day 17. On day 17, mice were administered daily PBS, DMSO, or TPPU (a potent sEH inhibitor) (1, 3, or 10 mg/kg) until the end of the study. TPPU only at 3 mg/kg dose decreased the AUC values calculated from EAE scores obtained during the disease compared to EAE and vehicle control groups. On day 25, TPPU also caused an increase in the PPARα/β/γ and NLRC3 proteins and a decrease in the proteins of TLR4, MyD88, NF-κB p65, p-NF-κB p65, iNOS/nNOS, COX-2, NLRC4, ASC, caspase-1 p20, IL-1β, caspase-11 p20, NOX subunits (gp91phox and p47phox), and nitrotyrosine in addition to 14,15-DHET and IL-1β levels compared to EAE and vehicle control groups. Our findings suggest that pharmacological inhibition of sEH attenuates chronic EAE likely because of enhanced levels of anti-inflammatory EETs in addition to PPARα/β/γ and NLRC3 expression associated with suppressed inflammatory TLR4/MyD88/NF-κB signalling pathway, NLRC4/ASC/pro-caspase-1 inflammasome, caspase-11 inflammasome, and NOX activity that are responsible for inflammatory mediator formation in the CNS of mice.
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Affiliation(s)
- Merve Biliktu
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey
| | - Sefika Pinar Senol
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey
| | - Meryem Temiz-Resitoglu
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey
| | - Demet Sinem Guden
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey
| | - Mehmet Furkan Horat
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey
| | - Seyhan Sahan-Firat
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey
| | - Serhan Sevim
- Department of Neurology, Faculty of Medicine, Mersin University, Mersin, Turkey
| | - Bahar Tunctan
- Department of Pharmacology, Faculty of Pharmacy, Yenisehir Campus, Mersin University, 33160, Yenisehir, Mersin, Turkey.
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Grimes D, Watson D. Epoxyeicosatrienoic acids protect pancreatic beta cells against pro-inflammatory cytokine toxicity. Biochem Biophys Res Commun 2019; 520:231-236. [PMID: 31590920 DOI: 10.1016/j.bbrc.2019.09.124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 09/27/2019] [Indexed: 11/19/2022]
Abstract
Pro-inflammatory cytokines contribute to pancreatic beta cell death in the pathogenesis of type 1 diabetes mellitus (DM). Cytochrome P450-derived epoxyeicosatrienoic acids (EETs), produced by selective epoxidation of arachidonic acid, display anti-inflammatory activity in numerous disease models, in part through inhibition of NFκB activity. No studies have directly assessed their roles in cellular models of pancreatic beta cell death and therefore we aimed to investigate the cytoprotective effects of the EET isomers 8(9)-, 11(12)- and 14(15)-EET and their corresponding vicinal diols (dihydroxyeicosatrienoic acids, DHETs) in a model of pro-inflammatory cytokine-toxicity using the rat pancreatic beta cell line BRIN-BD11. Co-treatment of cells with a cocktail of pro-inflammatory cytokines (IL-1β, IFNγ and TNFα) caused a marked increase in caspase activation and a reduction in cell viability, effects attenuated by inclusion of each EET; this was also associated with a reduction in cytokine-induced NFκB activation and nitrite accumulation. Surprisingly, of the DHET derivatives of EETs, 8(9)-DHET conferred similar protective effects against cytokine-induced caspase activation. This data therefore highlights a novel role of EETs and a surprising activity of 8(9)-DHET in attenuating cytokine-toxicity in pancreatic beta cells.
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Affiliation(s)
- Daniel Grimes
- School of Life Sciences, Keele University, Staffordshire, UK
| | - David Watson
- School of Life Sciences, Keele University, Staffordshire, UK.
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Motta AC, Strassburg K, Oranje P, Vreeken RJ, Jacobs DM. Oxylipin profiling in endothelial cells in vitro - Effects of DHA and hydrocortisone upon an inflammatory challenge. Prostaglandins Other Lipid Mediat 2019; 144:106352. [PMID: 31260749 DOI: 10.1016/j.prostaglandins.2019.106352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 06/17/2019] [Accepted: 06/27/2019] [Indexed: 11/27/2022]
Abstract
Omega-3 poly-unsaturated fatty acids have been shown to have beneficial effects on several inflammatory-driven endpoints such as cardiovascular diseases. The anti-inflammatory effects of docosahexaenoic acid (DHA) are largely mediated through various oxylipins. Yet, mechanistic insights are limited. Here, we measured 53 oxylipins using LC-MS/MS in an in vitro model of endothelial cell inflammation, and compared the changes induced by DHA to hydrocortisone, a well-established anti-inflammatory drug. DHA modified several oxylipins derived from different precursors such as DHA, AA, LA and EPA. In response to a TNFα and IL-1-β challenge, DHA clearly reduced many COX-derived pro-inflammatory oxylipins, yet to a minor extent when compared to hydrocortisone. DHA also upregulated metabolites from the CYP and LOX pathways as opposed to hydrocortisone. Thus, DHA reduced pro-inflammation and enhanced pro-resolution, while hydrocortisone blunted both the pro- and anti-inflammatory pathways. Our results may fuel further research on the mitigation of corticosteroids adverse side-effects.
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Affiliation(s)
- A C Motta
- Unilever R&D, Vlaardingen, The Netherlands.
| | - K Strassburg
- Netherlands Metabolomics Centre, LACDR, Leiden University, Leiden, the Netherlands; Analytical Biosciences, LACDR, Leiden University, Leiden, the Netherlands
| | - P Oranje
- Unilever R&D, Vlaardingen, The Netherlands
| | - R J Vreeken
- Netherlands Metabolomics Centre, LACDR, Leiden University, Leiden, the Netherlands; Analytical Biosciences, LACDR, Leiden University, Leiden, the Netherlands
| | - D M Jacobs
- Unilever R&D, Vlaardingen, The Netherlands
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Balistreri CR, Ruvolo G, Lio D, Madonna R. Toll-like receptor-4 signaling pathway in aorta aging and diseases: "its double nature". J Mol Cell Cardiol 2017; 110:38-53. [PMID: 28668304 DOI: 10.1016/j.yjmcc.2017.06.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 06/20/2017] [Accepted: 06/27/2017] [Indexed: 12/20/2022]
Abstract
Recent advances in the field of innate immunity have revealed a complex role of innate immune signaling pathways in both tissue homeostasis and disease. Among them, the Toll-like receptor 4 (TLR-4) pathways has been linked to various pathophysiological conditions, such as cardiovascular diseases (CVDs). This has been interrogated by developing multiple laboratory tools that have shown in animal models and clinical conditions, the involvement of the TLR-4 signaling pathway in the pathophysiology of different CVDs, such as atherosclerosis, ischemic heart disease, heart failure, ischemia-reperfusion injury and aorta aneurysm. Among these, aorta aneurysm, a very complex pathological condition with uncertain etiology and fatal complications (i.e. dissection and rupture), has been associated with the occurrence of high risk cardiovascular conditions, including thrombosis and embolism. In this review, we discuss the possible role of TLR-4 signaling pathway in the development of aorta aneurysm, considering the emerging evidence from ongoing investigations. Our message is that emphasizing the role of TLR-4 signaling pathway in aorta aneurysm may serve as a starting point for future studies, leading to a better understanding of the pathophysiological basis and perhaps the effective treatment of this difficult human disease.
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Affiliation(s)
- Carmela Rita Balistreri
- Department of Pathobiology and Medical Biotechnologies, University of Palermo, Corso Tukory 211, 90134 Palermo, Italy.
| | - Giovanni Ruvolo
- Department of Cardiac Surgery, University of Rome 'Tor Vergata', Rome, Italy
| | - Domenico Lio
- Department of Pathobiology and Medical Biotechnologies, University of Palermo, Corso Tukory 211, 90134 Palermo, Italy
| | - Rosalinda Madonna
- Heart Failure Research, Texas Heart Institute, St. Luke's Episcopal Hospital, Houston, TX, United States; Department of Internal Medicine, Cardiology, The University of Texas Health Science Center at Houston, Houston, TX, United States; Center of Aging Sciences and Translational Medicine - CESI-Met and Institute of Cardiology, Department of Neurosciences, Imaging and Clinical Sciences "G. D'Annunzio" University, 66100 Chieti, Italy
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9
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Rezende F, Prior KK, Löwe O, Wittig I, Strecker V, Moll F, Helfinger V, Schnütgen F, Kurrle N, Wempe F, Walter M, Zukunft S, Luck B, Fleming I, Weissmann N, Brandes RP, Schröder K. Cytochrome P450 enzymes but not NADPH oxidases are the source of the NADPH-dependent lucigenin chemiluminescence in membrane assays. Free Radic Biol Med 2017; 102:57-66. [PMID: 27863990 DOI: 10.1016/j.freeradbiomed.2016.11.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 10/21/2016] [Accepted: 11/07/2016] [Indexed: 10/20/2022]
Abstract
UNLABELLED Measuring NADPH oxidase (Nox)-derived reactive oxygen species (ROS) in living tissues and cells is a constant challenge. All probes available display limitations regarding sensitivity, specificity or demand highly specialized detection techniques. In search for a presumably easy, versatile, sensitive and specific technique, numerous studies have used NADPH-stimulated assays in membrane fractions which have been suggested to reflect Nox activity. However, we previously found an unaltered activity with these assays in triple Nox knockout mouse (Nox1-Nox2-Nox4-/-) tissue and cells compared to wild type. Moreover, the high ROS production of intact cells overexpressing Nox enzymes could not be recapitulated in NADPH-stimulated membrane assays. Thus, the signal obtained in these assays has to derive from a source other than NADPH oxidases. Using a combination of native protein electrophoresis, NADPH-stimulated assays and mass spectrometry, mitochondrial proteins and cytochrome P450 were identified as possible source of the assay signal. Cells lacking functional mitochondrial complexes, however, displayed a normal activity in NADPH-stimulated membrane assays suggesting that mitochondrial oxidoreductases are unlikely sources of the signal. Microsomes overexpressing P450 reductase, cytochromes b5 and P450 generated a NADPH-dependent signal in assays utilizing lucigenin, L-012 and dihydroethidium (DHE). Knockout of the cytochrome P450 reductase by CRISPR/Cas9 technology (POR-/-) in HEK293 cells overexpressing Nox4 or Nox5 did not interfere with ROS production in intact cells. However, POR-/- abolished the signal in NADPH-stimulated assays using membrane fractions from the very same cells. Moreover, membranes of rat smooth muscle cells treated with angiotensin II showed an increased NADPH-dependent signal with lucigenin which was abolished by the knockout of POR but not by knockout of p22phox. IN CONCLUSION the cytochrome P450 system accounts for the majority of the signal of Nox activity chemiluminescence based assays.
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Affiliation(s)
- Flávia Rezende
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Kim-Kristin Prior
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Oliver Löwe
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Ilka Wittig
- Functional Proteomics, SFB 815 Core Unit, Goethe-Universität, Frankfurt, Germany
| | - Valentina Strecker
- Functional Proteomics, SFB 815 Core Unit, Goethe-Universität, Frankfurt, Germany
| | - Franziska Moll
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Valeska Helfinger
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Frank Schnütgen
- Institute for Molecular Hematology, Goethe-University, Frankfurt, Germany
| | - Nina Kurrle
- Institute for Molecular Hematology, Goethe-University, Frankfurt, Germany
| | - Frank Wempe
- Institute for Molecular Hematology, Goethe-University, Frankfurt, Germany
| | - Maria Walter
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Sven Zukunft
- Institute for Vascular Signaling, Goethe-University, Frankfurt, Germany
| | - Bert Luck
- Institute for Vascular Signaling, Goethe-University, Frankfurt, Germany
| | - Ingrid Fleming
- Institute for Vascular Signaling, Goethe-University, Frankfurt, Germany
| | | | - Ralf P Brandes
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany.
| | - Katrin Schröder
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany.
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Abstract
Resolution of inflammation has emerged as an active process in immunobiology, with cells of the mononuclear phagocyte system being critical in mediating efferocytosis and wound debridement and bridging the gap between innate and adaptive immunity. Here we investigated the roles of cytochrome P450 (CYP)-derived epoxy-oxylipins in a well-characterized model of sterile resolving peritonitis in the mouse. Epoxy-oxylipins were produced in a biphasic manner during the peaks of acute (4 h) and resolution phases (24-48 h) of the response. The epoxygenase inhibitor SKF525A (epoxI) given at 24 h selectively inhibited arachidonic acid- and linoleic acid-derived CYP450-epoxy-oxlipins and resulted in a dramatic influx in monocytes. The epoxI-recruited monocytes were strongly GR1(+), Ly6c(hi), CCR2(hi), CCL2(hi), and CX3CR1(lo) In addition, expression of F4/80 and the recruitment of T cells, B cells, and dendritic cells were suppressed. sEH (Ephx2)(-/-) mice, which have elevated epoxy-oxylipins, demonstrated opposing effects to epoxI-treated mice: reduced Ly6c(hi) monocytes and elevated F4/80(hi) macrophages and B, T, and dendritic cells. Ly6c(hi) and Ly6c(lo) monocytes, resident macrophages, and recruited dendritic cells all showed a dramatic change in their resolution signature following in vivo epoxI treatment. Markers of macrophage differentiation CD11b, MerTK, and CD103 were reduced, and monocyte-derived macrophages and resident macrophages ex vivo showed greatly impaired phagocytosis of zymosan and efferocytosis of apoptotic thymocytes following epoxI treatment. These findings demonstrate that epoxy-oxylipins have a critical role in monocyte lineage recruitment and activity to promote inflammatory resolution and represent a previously unidentified internal regulatory system governing the establishment of adaptive immunity.
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