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Möller MN, Vitturi DA. The chemical biology of dinitrogen trioxide. REDOX BIOCHEMISTRY AND CHEMISTRY 2024; 8:100026. [PMID: 38957295 PMCID: PMC11218869 DOI: 10.1016/j.rbc.2024.100026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Dinitrogen trioxide (N 2 O 3 ) mediates low-molecular weight and protein S- and N-nitrosation, with recent reports suggesting a role in the formation of nitrating intermediates as well as in nitrite-dependent hypoxic vasodilatation. However, the reactivity ofN 2 O 3 in biological systems results in an extremely short half-life that renders this molecule essentially undetectable by currently available technologies. As a result, evidence for in vivoN 2 O 3 formation derives from the detection of nitrosated products as well as from in vitro kinetic determinations, isotopic labeling studies, and spectroscopic analyses. This review will discuss mechanisms ofN 2 O 3 formation, reactivity and decomposition, as well as address the role of sub-cellular localization as a key determinant of its actions. Finally, evidence will be discussed supporting different roles forN 2 O 3 as a biologically relevant signaling molecule.
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Affiliation(s)
- Matías N. Möller
- Laboratorio Fisicoquímica Biológica, Instituto de Química Biológica, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Darío A. Vitturi
- Department of Pathology. University of Alabama at Birmingham, Birmingham, AL, USA
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2
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Tsikas D. GC-MS Studies on Nitric Oxide Autoxidation and S-Nitrosothiol Hydrolysis to Nitrite in pH-Neutral Aqueous Buffers: Definite Results Using 15N and 18O Isotopes. Molecules 2023; 28:molecules28114281. [PMID: 37298756 DOI: 10.3390/molecules28114281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/19/2023] [Accepted: 05/20/2023] [Indexed: 06/12/2023] Open
Abstract
Nitrite (O=N-O-, NO2-) and nitrate (O=N(O)-O-, NO3-) are ubiquitous in nature. In aerated aqueous solutions, nitrite is considered the major autoxidation product of nitric oxide (●NO). ●NO is an environmental gas but is also endogenously produced from the amino acid L-arginine by the catalytic action of ●NO synthases. It is considered that the autoxidation of ●NO in aqueous solutions and in O2-containing gas phase proceeds via different neutral (e.g., O=N-O-N=O) and radical (e.g., ONOO●) intermediates. In aqueous buffers, endogenous S-nitrosothiols (thionitrites, RSNO) from thiols (RSH) such as L-cysteine (i.e., S-nitroso-L-cysteine, CysSNO) and cysteine-containing peptides such as glutathione (GSH) (i.e., S-nitrosoglutathione, GSNO) may be formed during the autoxidation of ●NO in the presence of thiols and dioxygen (e.g., GSH + O=N-O-N=O → GSNO + O=N-O- + H+; pKaHONO, 3.24). The reaction products of thionitrites in aerated aqueous solutions may be different from those of ●NO. This work describes in vitro GC-MS studies on the reactions of unlabeled (14NO2-) and labeled nitrite (15NO2-) and RSNO (RS15NO, RS15N18O) performed in pH-neutral aqueous buffers of phosphate or tris(hydroxyethylamine) prepared in unlabeled (H216O) or labeled H2O (H218O). Unlabeled and stable-isotope-labeled nitrite and nitrate species were measured by gas chromatography-mass spectrometry (GC-MS) after derivatization with pentafluorobenzyl bromide and negative-ion chemical ionization. The study provides strong indication for the formation of O=N-O-N=O as an intermediate of ●NO autoxidation in pH-neutral aqueous buffers. In high molar excess, HgCl2 accelerates and increases RSNO hydrolysis to nitrite, thereby incorporating 18O from H218O into the SNO group. In aqueous buffers prepared in H218O, synthetic peroxynitrite (ONOO-) decomposes to nitrite without 18O incorporation, indicating water-independent decomposition of peroxynitrite to nitrite. Use of RS15NO and H218O in combination with GC-MS allows generation of definite results and elucidation of reaction mechanisms of oxidation of ●NO and hydrolysis of RSNO.
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Affiliation(s)
- Dimitrios Tsikas
- Core Unit Proteomics, Institute of Toxicology, Hannover Medical School, 30625 Hannover, Germany
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3
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Del Piano F, Lama A, Monnolo A, Pirozzi C, Piccolo G, Vozzo S, De Biase D, Riccio L, Fusco G, Mercogliano R, Meli R, Ferrante MC. Subchronic Exposure to Polystyrene Microplastic Differently Affects Redox Balance in the Anterior and Posterior Intestine of Sparus aurata. Animals (Basel) 2023; 13:ani13040606. [PMID: 36830393 PMCID: PMC9951662 DOI: 10.3390/ani13040606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/01/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Microplastics (MPs) are pollutants widely distributed in aquatic ecosystems. MPs are introduced mainly by ingestion acting locally or in organs far from the gastroenteric tract. MPs-induced health consequences for fish species still need to be fully understood. We aimed to investigate the effects of the subchronic oral exposure to polystyrene microplastics (PS-MPs) (1-20 μm) in the gilthead seabreams (Sparus aurata) used as the experimental model. We studied the detrimental impact of PS-MPs (25 and 250 mg/kg b.w./day) on the redox balance and antioxidant status in the intestine using histological analysis and molecular techniques. The research goal was to examine the anterior (AI) and posterior intestine (PI) tracts, characterized by morphological and functional differences. PS-MPs caused an increase of reactive oxygen species and nitrosylated proteins in both tracts, as well as augmented malondialdehyde production in the PI. PS-MPs also differently affected gene expression of antioxidant enzymes (i.e., superoxide dismutase, catalase, glutathione reductase). Moreover, an increased up-regulation of protective heat shock proteins (HSPs) (i.e., hsp70 and hsp90) was observed in PI. Our findings demonstrate that PS-MPs are responsible for oxidative/nitrosative stress and alterations of detoxifying defense system responses with differences in AI and PI of gilthead seabreams.
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Affiliation(s)
- Filomena Del Piano
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
| | - Adriano Lama
- Department of Pharmacy, University of Naples Federico II, Via D. Montesano 49, 80131 Naples, Italy
| | - Anna Monnolo
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
| | - Claudio Pirozzi
- Department of Pharmacy, University of Naples Federico II, Via D. Montesano 49, 80131 Naples, Italy
| | - Giovanni Piccolo
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
| | - Simone Vozzo
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
| | - Davide De Biase
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Lorenzo Riccio
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
| | - Giovanna Fusco
- Zooprophylactic Institute of Southern Italy, Via Salute 2, 80055 Portici, Italy
| | - Raffaelina Mercogliano
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
| | - Rosaria Meli
- Department of Pharmacy, University of Naples Federico II, Via D. Montesano 49, 80131 Naples, Italy
| | - Maria Carmela Ferrante
- Department of Veterinary Medicine and Animal Productions, Via Delpino 1, 80137 Naples, Italy
- Correspondence:
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Vaglienti MV, Subirada PV, Joray MB, Bonacci G, Sánchez MC. Protective Effect of NO 2-OA on Oxidative Stress, Gliosis, and Pro-Angiogenic Response in Müller Glial Cells. Cells 2023; 12:cells12030494. [PMID: 36766836 PMCID: PMC9914399 DOI: 10.3390/cells12030494] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 02/05/2023] Open
Abstract
Inflammation and oxidative and nitrosative stress are involved in the pathogenesis of proliferative retinopathies (PR). In PR, a loss of balance between pro-angiogenic and anti-angiogenic factors favors the secretion of vascular endothelial growth factor (VEGF). This vascular change results in alterations in the blood-retinal barrier, with extravasation of plasma proteins such as α2-macroglobulin (α2M) and gliosis in Müller glial cells (MGCs, such as MIO-M1). It is well known that MGCs play important roles in healthy and sick retinas, including in PR. Nitro-fatty acids are electrophilic lipid mediators with anti-inflammatory and cytoprotective properties. Our aim was to investigate whether nitro-oleic acid (NO2-OA) is beneficial against oxidative stress, gliosis, and the pro-angiogenic response in MGCs. Pure synthetic NO2-OA increased HO-1 expression in a time- and concentration-dependent manner, which was abrogated by the Nrf2 inhibitor trigonelline. In response to phorbol 12-myristate 13-acetate (PMA) and lipopolysaccharide (LPS), NO2-OA prevented the ROS increase and reduced the gliosis induced by α2M. Finally, when hypoxic MGCs were incubated with NO2-OA, the increase in VEGF mRNA expression was not affected, but under hypoxia and inflammation (IL-1β), NO2-OA significantly reduced VEGF mRNA levels. Furthermore, NO2-OA inhibited endothelial cell (BAEC) tubulogenesis. Our results highlight NO2-OA's protective effect on oxidative damage, gliosis; and the exacerbated pro-angiogenic response in MGCs.
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Affiliation(s)
- María V. Vaglienti
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba 5000, Argentina
| | - Paula V. Subirada
- Instituto de Investigación Médica Mercedes y Martín Ferreyra (INIMEC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba 5000, Argentina
| | - Mariana B. Joray
- Facultad de Ciencias Químicas, Universidad Católica de Córdoba, Córdoba 5000, Argentina
- Instituto de Investigaciones en Recursos Naturales y Sustentabilidad José Sánchez Labrador J. S., Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba 5000, Argentina
| | - Gustavo Bonacci
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba 5000, Argentina
- Correspondence: (G.B.); (M.C.S.)
| | - María C. Sánchez
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba 5000, Argentina
- Correspondence: (G.B.); (M.C.S.)
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Sun J, Zhang X, Wang X, Peng J, Song G, Di Y, Feng F, Wang S. Dithiol-Activated Bioorthogonal Chemistry for Endoplasmic Reticulum-Targeted Synergistic Chemophototherapy. Angew Chem Int Ed Engl 2022; 61:e202213765. [PMID: 36342403 DOI: 10.1002/anie.202213765] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Indexed: 11/09/2022]
Abstract
The controlled intracellular release of nitrite is still an unmet challenge due to the lack of bio-friendly donors, and the antitumor effect of nitrite is limited by its physiologically inert activity. Herein, we designed benzothiadiazole-based organic nitrite donors that are stable against bio-relevant species but selectively respond to dithiol species through SN Ar/intramolecular cyclization tandem reactions in the aqueous media. The bioorthogonal system was established to target the endoplasmic reticulum (ER) of liver cancer HepG2 cells. The nitrite and nonivamide were coupled to induce elevation of intracellular levels of calcium ions as well as reactive oxygen/nitrogen species, which resulted in ER stress and mitochondrial dysfunction. We demonstrated that a combination of photoactivation and "click to release" strategy could enhance antitumor effect in cellular level and show good potential for cancer precision therapy.
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Affiliation(s)
- Jian Sun
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.,Department of Polymer Science & Engineering, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Jiangsu, Nanjing, P. R. China
| | - Xiaoran Zhang
- Department of Polymer Science & Engineering, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Jiangsu, Nanjing, P. R. China
| | - Xia Wang
- Department of Polymer Science & Engineering, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Jiangsu, Nanjing, P. R. China
| | - Jinlei Peng
- Department of Polymer Science & Engineering, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Jiangsu, Nanjing, P. R. China
| | - Gang Song
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.,College of Chemistry, University of Chinese Academy of Sciences, 100190, Beijing, P. R. China
| | - Yufei Di
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.,College of Chemistry, University of Chinese Academy of Sciences, 100190, Beijing, P. R. China
| | - Fude Feng
- Department of Polymer Science & Engineering, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Jiangsu, Nanjing, P. R. China
| | - Shu Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.,College of Chemistry, University of Chinese Academy of Sciences, 100190, Beijing, P. R. China
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6
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Yu GZ, Ramasamy T, Fazzari M, Chen X, Freeman B, Pacella JJ. Lipid nitroalkene nanoparticles for the focal treatment of ischemia reperfusion. Nanotheranostics 2022; 6:215-229. [PMID: 34976596 PMCID: PMC8671954 DOI: 10.7150/ntno.62351] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 11/05/2021] [Indexed: 12/26/2022] Open
Abstract
Rationale: The treatment of microvascular obstruction (MVO) using ultrasound-targeted LNP cavitation (UTC) therapy mechanically relieves the physical obstruction in the microcirculation but does not specifically target the associated inflammatory milieu. Electrophilic fatty acid nitroalkene derivatives (nitro-fatty acids), that display pleiotropic anti-inflammatory signaling and transcriptional regulatory actions, offer strong therapeutic potential but lack a means of rapid targeted delivery. The objective of this study was to develop nitro-fatty acid-containing lipid nanoparticles (LNP) that retain the mechanical efficacy of standard LNP and can rapidly target delivery of a tissue-protective payload that reduces inflammation and improves vascular function following ischemia-reperfusion. Methods: The stability and acoustic behavior of nitro-fatty acid LNP (NO2-FA-LNP) were characterized by HPLC-MS/MS and ultra-high-speed microscopy. The LNP were then used in a rat hindlimb model of ischemia-reperfusion injury with ultrasound-targeted cavitation. Results: Intravenous administration of NO2-FA-LNP followed by ultrasound-targeted LNP cavitation (UTC) in both healthy rat hindlimb and following ischemia-reperfusion injury showed enhanced NO2-FA tissue delivery and microvascular perfusion. In addition, vascular inflammatory mediator expression and lipid peroxidation were decreased in tissues following ischemia-reperfusion revealed NO2-FA-LNP protected against inflammatory injury. Conclusions: Vascular targeting of NO2-FA-LNP with UTC offers a rapid method of focal anti-inflammatory therapy at sites of ischemia-reperfusion injury.
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Affiliation(s)
- Gary Z Yu
- Center for Ultrasound Molecular Imaging and Therapeutics, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Thiruganesh Ramasamy
- Center for Ultrasound Molecular Imaging and Therapeutics, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Marco Fazzari
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Xucai Chen
- Center for Ultrasound Molecular Imaging and Therapeutics, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bruce Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - John J Pacella
- Center for Ultrasound Molecular Imaging and Therapeutics, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
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7
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Nitro-fatty acids decrease type I interferons and monocyte chemoattractant protein 1 in ex vivo models of inflammatory arthritis. BMC Immunol 2021; 22:77. [PMID: 34920714 PMCID: PMC8684285 DOI: 10.1186/s12865-021-00471-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 12/02/2021] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Inflammatory arthritis including rheumatoid arthritis (RA) and spondyloarthritis (SpA) is characterized by inflammation and destruction of the joints. Approximately one third of patients do not respond to first-line treatments. Nitro-fatty acids are bioactive lipids with anti-inflammatory properties and tissue-protective functions. The nitro-fatty acid 10-NO2-oleic acid (10-NO2-OA) is being tested in clinical trials for patients with fibrotic and inflammatory conditions. Here, we tested whether 10-NO2-OA could inhibit immune reactions involved in the inflammatory and joint destructive processes in inflammatory arthritis. METHODS Synovial fluid and blood samples were obtained from 14 patients with active RA or SpA. The in vitro models consisted of synovial fluid mononuclear cells (SFMCs) cultured for 48 h, SFMCs cultured for 21 days, and fibroblast-like synovial cells (FLSs) co-cultured with peripheral blood mononuclear cells (PBMCs) for 48 h. Cells were treated with or without 10-NO2-OA or the tumor necrosis factor alpha (TNFα) inhibitor etanercept. Supernatants were analyzed for type I interferon, monocyte chemoattractant protein-1 (MCP-1), matrix metalloproteinase 3 (MMP3) and tartrate resistant acid phosphatase (TRAP). RESULTS In SFMCs cultured for 48 h, 10-NO2-OA dose-dependently decreased the secretion of bioactive type I interferons and MCP-1 but not MMP3 (P = 0.032, P = 0.0001, and P = 0.58, respectively). Both MCP-1 and MMP3 were decreased by etanercept (P = 0.0031 and P = 0.026, respectively). In SFMCs cultured for 21 days, 10-NO2-OA significantly decreased the production of MCP-1 but not TRAP (P = 0.027 and P = 0.1523, respectively). Etanercept decreased the production of TRAP but not MCP-1 (P < 0.001 and P = 0.84, respectively). In co-cultures of FLSs and PBMCs, 10-NO2-OA decreased the production of MCP-1 (P < 0.0001). This decrease in MCP-1 production was not seen with etanercept treatment (P = 0.47). CONCLUSION 10-NO2-OA decreased the release of MCP-1 in three models of inflammatory arthritis. Of particular interest, 10-NO2-OA inhibited type I interferon, and 10-NO2-OA was more effective in reducing MCP-1 production in cultures dominated by FLSs compared with etanercept. Our results encourage clinical investigations of 10-NO2-OA in patients with inflammatory arthritis.
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Nitro Fatty Acids (NO 2-FAs): An Emerging Class of Bioactive Fatty Acids. Molecules 2021; 26:molecules26247536. [PMID: 34946618 PMCID: PMC8708353 DOI: 10.3390/molecules26247536] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 12/08/2021] [Accepted: 12/10/2021] [Indexed: 12/24/2022] Open
Abstract
Unsaturated nitro fatty acids (NO2-FAs) constitute a category of molecules that may be formed endogenously by the reaction of unsaturated fatty acids (UFAs) with secondary species of nitrogen monoxide and nitrite anions. The warhead of NO2-FAs is a nitroalkene moiety, which is a potent Michael acceptor and can undergo nucleophilic attack from thiol groups of biologically relevant proteins, showcasing the value of these molecules regarding their therapeutic potential against many diseases. In general, NO2-FAs inhibit nuclear factorκ-B (NF-κB), and simultaneously they activate nuclear factor (erythroid derived)-like 2 (Nrf2), which activates an antioxidant signaling pathway. NO2-FAs can be synthesized not only endogenously in the organism, but in a synthetic laboratory as well, either by a step-by-step synthesis or by a direct nitration of UFAs. The step-by-step synthesis requires specific precursor compounds and is in position to afford the desired NO2-FAs with a certain position of the nitro group. On the contrary, the direct nitration of UFAs is not a selective methodology; thus, it affords a mixture of all possible nitro isomers.
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Fatty acid nitroalkene reversal of established lung fibrosis. Redox Biol 2021; 50:102226. [PMID: 35150970 PMCID: PMC8844680 DOI: 10.1016/j.redox.2021.102226] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/17/2021] [Accepted: 12/27/2021] [Indexed: 02/06/2023] Open
Abstract
Tissue fibrosis occurs in response to dysregulated metabolism, pro-inflammatory signaling and tissue repair reactions. For example, lungs exposed to environmental toxins, cancer therapies, chronic inflammation and other stimuli manifest a phenotypic shift to activated myofibroblasts and progressive and often irreversible lung tissue scarring. There are no therapies that stop or reverse fibrosis. The 2 FDA-approved anti-fibrotic drugs at best only slow the progression of fibrosis in humans. The present study was designed to test whether a small molecule electrophilic nitroalkene, nitro-oleic acid (NO2-OA), could reverse established pulmonary fibrosis induced by the intratracheal administration of bleomycin in C57BL/6 mice. After 14 d of bleomycin-induced fibrosis development in vivo, lungs were removed, sectioned and precision-cut lung slices (PCLS) from control and bleomycin-treated mice were cultured ex vivo for 4 d with either vehicle or NO2-OA (5 μM). Biochemical and morphological analyses showed that over a 4 d time frame, NO2-OA significantly inhibited pro-inflammatory mediator and growth factor expression and reversed key indices of fibrosis (hydroxyproline, collagen 1A1 and 3A1, fibronectin-1). Quantitative image analysis of PCLS immunohistology reinforced these observations, revealing that NO2-OA suppressed additional hallmarks of the fibrotic response, including alveolar epithelial cell loss, myofibroblast differentiation and proliferation, collagen and α-smooth muscle actin expression. NO2-OA also accelerated collagen degradation by resident macrophages. These effects occurred in the absence of the recognized NO2-OA modulation of circulating and migrating immune cell activation. Thus, small molecule nitroalkenes may be useful agents for reversing pathogenic fibrosis of lung and other organs. Small molecule electrophiles, pleiotropic anti-inflammatory and anti-fibrotic drugs. NO2-OA inhibits activated myofibroblasts, induces dedifferentiation to fibroblasts. NO2-OA activates extracellular matrix degradation by macrophages. NO2-OA promotes proliferation of alveolar type 1 and 2 epithelial cells. NO2-OA reverses established lung fibrosis in murine lung slices.
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Di Fino L, Arruebarrena Di Palma A, Perk EA, García-Mata C, Schopfer FJ, Laxalt AM. Nitro-fatty acids: electrophilic signaling molecules in plant physiology. PLANTA 2021; 254:120. [PMID: 34773515 PMCID: PMC10704571 DOI: 10.1007/s00425-021-03777-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 10/30/2021] [Indexed: 06/13/2023]
Abstract
MAIN CONCLUSION Nitro fatty acids (NO2-FA)have relevant physiological roles as signaling molecules in biotic and abiotic stress, growth, and development, but the mechanism of action remains controversial. The two main mechanisms involving nitric oxide release and thiol modification are discussed. Fatty acids (FAs) are major components of membranes and contribute to cellular energetic demands. Besides, FAs are precursors of signaling molecules, including oxylipins and other oxidized fatty acids derived from the activity of lipoxygenases. In addition, non-canonical modified fatty acids, such as nitro-fatty acids (NO2-FAs), are formed in animals and plants. The synthesis NO2-FAs involves a nitration reaction between unsaturated fatty acids and reactive nitrogen species (RNS). This review will focus on recent findings showing that, in plants, NO2-FAs such as nitro-linolenic acid (NO2-Ln) and nitro-oleic acid (NO2-OA) have relevant physiological roles as signaling molecules in biotic and abiotic stress, growth, and development. Moreover, since there is controversy on mechanisms of action of NO2-FAs as signaling molecules, we will provide evidence showing why this aspect needs further evaluation.
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Affiliation(s)
- Luciano Di Fino
- Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
| | - Andrés Arruebarrena Di Palma
- Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
| | - Enzo A Perk
- Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
| | - Carlos García-Mata
- Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ana M Laxalt
- Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina.
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Yoon S, Eom GH, Kang G. Nitrosative Stress and Human Disease: Therapeutic Potential of Denitrosylation. Int J Mol Sci 2021; 22:ijms22189794. [PMID: 34575960 PMCID: PMC8464666 DOI: 10.3390/ijms22189794] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 01/22/2023] Open
Abstract
Proteins dynamically contribute towards maintaining cellular homeostasis. Posttranslational modification regulates the function of target proteins through their immediate activation, sudden inhibition, or permanent degradation. Among numerous protein modifications, protein nitrosation and its functional relevance have emerged. Nitrosation generally initiates nitric oxide (NO) production in association with NO synthase. NO is conjugated to free thiol in the cysteine side chain (S-nitrosylation) and is propagated via the transnitrosylation mechanism. S-nitrosylation is a signaling pathway frequently involved in physiologic regulation. NO forms peroxynitrite in excessive oxidation conditions and induces tyrosine nitration, which is quite stable and is considered irreversible. Two main reducing systems are attributed to denitrosylation: glutathione and thioredoxin (TRX). Glutathione captures NO from S-nitrosylated protein and forms S-nitrosoglutathione (GSNO). The intracellular reducing system catalyzes GSNO into GSH again. TRX can remove NO-like glutathione and break down the disulfide bridge. Although NO is usually beneficial in the basal context, cumulative stress from chronic inflammation or oxidative insult produces a large amount of NO, which induces atypical protein nitrosation. Herein, we (1) provide a brief introduction to the nitrosation and denitrosylation processes, (2) discuss nitrosation-associated human diseases, and (3) discuss a possible denitrosylation strategy and its therapeutic applications.
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Affiliation(s)
- Somy Yoon
- Department of Pharmacology, Chonnam National University Medical School, Hwasun 58128, Korea;
| | - Gwang Hyeon Eom
- Department of Pharmacology, Chonnam National University Medical School, Hwasun 58128, Korea;
- Correspondence: (G.-H.E.); (G.K.); Tel.: +82-61-379-2837 (G.-H.E.); +82-62-220-5262 (G.K.)
| | - Gaeun Kang
- Division of Clinical Pharmacology, Chonnam National University Hospital, Gwangju 61469, Korea
- Correspondence: (G.-H.E.); (G.K.); Tel.: +82-61-379-2837 (G.-H.E.); +82-62-220-5262 (G.K.)
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12
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Fazzari M, Woodcock SR, Rowart P, Ricart K, Lancaster JR, Patel R, Vitturi DA, Freeman BA, Schopfer FJ. Endogenous generation of nitro-fatty acid hybrids having dual nitrate ester (RONO 2) and nitroalkene (RNO 2) substituents. Redox Biol 2021; 41:101913. [PMID: 33819836 PMCID: PMC8049994 DOI: 10.1016/j.redox.2021.101913] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/15/2021] [Accepted: 02/18/2021] [Indexed: 11/25/2022] Open
Abstract
Organic nitrate esters, long-recognized therapies for cardiovascular disorders, have not been detected biologically. We characterize in rat stomach unsaturated fatty acid nitration reactions that proceed by generation of nitro-nitrate intermediates (NO2-ONO2-FA) via oxygen and nitrite dependent reactions. NO2-ONO2-lipids represent ∼70% of all nitrated lipids in the stomach and they decay in vitro at neutral or basic pH by the loss of the nitrate ester group (-ONO2) from the carbon backbone upon deprotonation of the α-carbon (pKa ∼7), yielding nitrate, nitrite, nitrosative species, and an electrophilic fatty acid nitroalkene product (NO2-FA). Of note, NO2-FA are anti-inflammatory and tissue-protective signaling mediators, which are undergoing Phase II trials for the treatment of kidney and pulmonary diseases. The decay of NO2-ONO2-FA occurs during intestinal transit and absorption, leading to the formation of NO2-FA that were subsequently detected in circulating plasma triglycerides. These observations provide new insight into unsaturated fatty acid nitration mechanisms, identify nitro-nitrate ester-containing lipids as intermediates in the formation of both secondary nitrogen oxides and electrophilic fatty acid nitroalkenes, and expand the scope of endogenous products stemming from metabolic reactions of nitrogen oxides.
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Affiliation(s)
- Marco Fazzari
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA.
| | - Steven R Woodcock
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA
| | - Pascal Rowart
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA
| | - Karina Ricart
- Department of Pathology, University of Alabama, 901 19th Street South, Birmingham, 35294, AL, USA
| | - Jack R Lancaster
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA; Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute, Pittsburgh, 15213, PA, USA
| | - Rakesh Patel
- Department of Pathology, University of Alabama, 901 19th Street South, Birmingham, 35294, AL, USA
| | - Dario A Vitturi
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA; Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute, Pittsburgh, 15213, PA, USA; Center for Critical Care Nephrology, Pittsburgh, 15213, PA, USA
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, 15261, PA, USA; Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute, Pittsburgh, 15213, PA, USA
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13
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Chen L, Deng Z, Zhao C. Nitrogen-Nitrogen Bond Formation Reactions Involved in Natural Product Biosynthesis. ACS Chem Biol 2021; 16:559-570. [PMID: 33721494 DOI: 10.1021/acschembio.1c00052] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Construction of nitrogen-nitrogen bonds involves sophisticated biosynthetic mechanisms to overcome the difficulties inherent to the nucleophilic nitrogen atom of amine. Over the past decade, a multitude of reactions responsible for nitrogen-nitrogen bond formation in natural product biosynthesis have been uncovered. On the basis of the intrinsic properties of these reactions, this Review classifies these reactions into three categories: comproportionation, rearrangement, and radical recombination reactions. To expound the metallobiochemistry underlying nitrogen-nitrogen bond formation reactions, we discuss the enzymatic mechanisms in comparison to well characterized canonical heme-dependent enzymes, mononuclear nonheme iron-dependent enzymes, and nonheme di-iron enzymes. We also illuminate the intermediary properties of nitrogen oxide species NO2-, NO+, and N2O3 in nitrogen-nitrogen bond formation reactions with clues derived from inorganic nitrogen metabolism driven by anammox bacteria and nitrifying bacteria. These multidimentional discussions will provide further insights into the mechanistic proposals of nitrogen-nitrogen bond formation in natural product biosynthesis.
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Affiliation(s)
- Linyue Chen
- Key Laboratory of Combinatory Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Hubei 430072, People’s Republic of China
| | - Zixin Deng
- Key Laboratory of Combinatory Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Hubei 430072, People’s Republic of China
| | - Changming Zhao
- Key Laboratory of Combinatory Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Hubei 430072, People’s Republic of China
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14
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Salvatore SR, Rowart P, Schopfer FJ. Mass spectrometry-based study defines the human urine nitrolipidome. Free Radic Biol Med 2021; 162:327-337. [PMID: 33131723 PMCID: PMC10895545 DOI: 10.1016/j.freeradbiomed.2020.10.305] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 02/09/2023]
Abstract
Nitrated fatty acids (NO2-FA) are an endogenous class of signaling mediators formed mainly during digestion and inflammation. The signaling actions of NO2-FA have been extensively studied, but their detection and characterization lagged. Several different nitrated fatty acid species have been reported in animals and humans, but their formation remains controversial, and a systemic approach to define the endogenous pool of NO2-FA is needed. Herein, we screened for endogenous NO2-FA in urine from healthy human volunteers as this is the main excretion route for NO2-FA and its metabolites, and it provides an excellent matrix for evaluation. Only isomers of two fatty acids, conjugated linoleic and linolenic acid were found to be nitrated. Several, previously unknown, nitrated species were identified and confirmed using high-resolution mass spectrometry, fragmentation analysis, and compared to synthetic nitrated standards, the main group corresponding to nitrated conjugated linolenic acid (NO2-CLnA). In contrast, we were unable to confirm the presence of previously reported nitrated omega-3's, oleic acid, arachidonic acid and α- and γ-linolenic acid, suggesting that their biological formation and presence in humans should be re-evaluated. Metabolite analysis of NO2-CLnA in human urine identified cysteine adducts and β-oxidation products, which were compared to the metabolic products of nitrated standards obtained using primary mouse hepatocytes. Importantly, NO2-CLnA isomers belong to two defined groups, are electrophilic, participate in Michael addition reactions and account for 39% of total urinary NO2-FA, highlighting their relative abundance and possible role in cell signaling.
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Affiliation(s)
- Sonia R Salvatore
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15261, USA
| | - Pascal Rowart
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15261, USA
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15261, USA; Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute, Pittsburgh, PA, USA.
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15
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The solution chemistry of nitric oxide and other reactive nitrogen species. Nitric Oxide 2020; 103:31-46. [DOI: 10.1016/j.niox.2020.07.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/14/2020] [Accepted: 07/16/2020] [Indexed: 12/17/2022]
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16
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Guerra DD, Hurt KJ. Gasotransmitters in pregnancy: from conception to uterine involution. Biol Reprod 2020; 101:4-25. [PMID: 30848786 DOI: 10.1093/biolre/ioz038] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/14/2019] [Accepted: 03/06/2019] [Indexed: 12/13/2022] Open
Abstract
Gasotransmitters are endogenous small gaseous messengers exemplified by nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S or sulfide). Gasotransmitters are implicated in myriad physiologic functions including many aspects of reproduction. Our objective was to comprehensively review basic mechanisms and functions of gasotransmitters during pregnancy from conception to uterine involution and highlight future research opportunities. We searched PubMed and Web of Science databases using combinations of keywords nitric oxide, carbon monoxide, sulfide, placenta, uterus, labor, and pregnancy. We included English language publications on human and animal studies from any date through August 2018 and retained basic and translational articles with relevant original findings. All gasotransmitters activate cGMP signaling. NO and sulfide also covalently modify target protein cysteines. Protein kinases and ion channels transduce gasotransmitter signals, and co-expressed gasotransmitters can be synergistic or antagonistic depending on cell type. Gasotransmitters influence tubal transit, placentation, cervical remodeling, and myometrial contractility. NO, CO, and sulfide dilate resistance vessels, suppress inflammation, and relax myometrium to promote uterine quiescence and normal placentation. Cervical remodeling and rupture of fetal membranes coincide with enhanced oxidation and altered gasotransmitter metabolism. Mechanisms mediating cellular and organismal changes in pregnancy due to gasotransmitters are largely unknown. Altered gasotransmitter signaling has been reported for preeclampsia, intrauterine growth restriction, premature rupture of membranes, and preterm labor. However, in most cases specific molecular changes are not yet characterized. Nonclassical signaling pathways and the crosstalk among gasotransmitters are emerging investigation topics.
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Affiliation(s)
- Damian D Guerra
- Division of Reproductive Sciences, Department of Obstetrics and Gynecology, University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado, USA
| | - K Joseph Hurt
- Division of Reproductive Sciences, Department of Obstetrics and Gynecology, University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado, USA.,Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado, USA
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17
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Vitturi DA, Maynard C, Olsufka M, Straub AC, Krehel N, Kudenchuk PJ, Nichol G, Sayre M, Kim F, Dezfulian C. Nitrite elicits divergent NO-dependent signaling that associates with outcome in out of hospital cardiac arrest. Redox Biol 2020; 32:101463. [PMID: 32087553 PMCID: PMC7033352 DOI: 10.1016/j.redox.2020.101463] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 02/01/2020] [Accepted: 02/11/2020] [Indexed: 01/16/2023] Open
Abstract
Brain and heart injury cause most out-of-hospital cardiac arrest deaths but limited pharmacotherapy exists to protect these tissues. Nitrite is a nitric oxide precursor that is protective in pre-clinical models of ischemic injury and safe in Phase I testing. Protection may occur by cGMP generation via the sGC pathway or through S-nitrosothiol and nitrated conjugated linoleic acid (NO2-CLA) formation. We hypothesized that nitrite provided during CPR signals through multiple pathways and that activation of signals is associated with OHCA outcome. To this end, we performed a secondary analysis of a phase 1 study of intravenous nitrite administration during resuscitation in adult out-of-hospital cardiac arrest. Associations between whole blood nitrite and derived plasma signals (cGMP and NO2-CLA) with patient characteristics and outcomes were defined using Chi-square or t-tests and multiple logistic regression. Whole blood nitrite levels correlated inversely with plasma NO2-CLA (p = 0.039) but not with cGMP. Patients with shockable rhythms had higher cGMP (p = 0.027), NO2-CLA (p < 0.0001) and trended towards lower nitrite (p = 0.077). Importantly, plasma cGMP and NO2-CLA levels were higher in survivors (p = 0.033 and 0.019) and in those with good neurological outcome (p = 0.046 and 0.021). Nitrite was lower in patients with good neurologic outcome (p = 0.029). cGMP (OR 4.02; 95% CI 1.04–15.54; p = 0.044) and NO2-CLA (OR 3.74; 95% CI 1.11–12.65; p = 0.034) were associated with survival. Nitrite (OR 0.20; 95% CI 0.05–0.08; p = 0.026) and NO2-CLA (OR 3.96; 95% CI 1.01–15.60; p = 0.049) were associated with favorable neurologic outcome. In summary, nitrite administration was associated with increased plasma cGMP and NO2-CLA formation in selected OHCA patients. Furthermore, patients with the highest levels of cGMP and NO2-CLA were more likely to survive and experience better neurological outcomes.
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Affiliation(s)
- Dario A Vitturi
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, USA; Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, USA
| | - Charles Maynard
- Department of Health Services, University of Washington, USA
| | - Michele Olsufka
- Department of Health Services, University of Washington, USA; Department of Medicine, Harborview Medical Center, University of Washington, USA
| | - Adam C Straub
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, USA; Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, USA
| | - Nick Krehel
- Department of Critical Care Medicine, Safar Center for Resuscitation Research, University of Pittsburgh, USA
| | - Peter J Kudenchuk
- Department of Medicine, Harborview Medical Center, University of Washington, USA
| | - Graham Nichol
- Department of Medicine, Harborview Medical Center, University of Washington, USA
| | - Michael Sayre
- Department of Medicine, Harborview Medical Center, University of Washington, USA
| | - Francis Kim
- Department of Medicine, Harborview Medical Center, University of Washington, USA
| | - Cameron Dezfulian
- Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, USA; Department of Critical Care Medicine, Safar Center for Resuscitation Research, University of Pittsburgh, USA.
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18
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Mastrogiovanni M, Trostchansky A, Rubbo H. Fatty acid nitration in human low-density lipoprotein. Arch Biochem Biophys 2020; 679:108190. [PMID: 31738891 DOI: 10.1016/j.abb.2019.108190] [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: 07/04/2019] [Revised: 11/05/2019] [Accepted: 11/12/2019] [Indexed: 10/25/2022]
Abstract
Lipid nitration occurs during physiological and pathophysiological conditions, generating a variety of biomolecules capable to modulate inflammatory cell responses. Low-density lipoprotein (LDL) oxidation has been extensively related to atherosclerotic lesion development while oxidative modifications confer the particle pro-atherogenic features. Herein, we reviewed the oxidation versus nitration of human LDL protein and lipid fractions. We propose that unsaturated fatty acids present in LDL can be nitrated under mild nitration conditions, suggesting an anti-atherogenic role for LDL carrying nitro-fatty acids (NFA).
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Affiliation(s)
- Mauricio Mastrogiovanni
- Departamento de Bioquímica, Facultad de Medicina and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Andrés Trostchansky
- Departamento de Bioquímica, Facultad de Medicina and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Homero Rubbo
- Departamento de Bioquímica, Facultad de Medicina and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay.
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19
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Lamas Bervejillo M, Bonanata J, Franchini GR, Richeri A, Marqués JM, Freeman BA, Schopfer FJ, Coitiño EL, Córsico B, Rubbo H, Ferreira AM. A FABP4-PPARγ signaling axis regulates human monocyte responses to electrophilic fatty acid nitroalkenes. Redox Biol 2020; 29:101376. [PMID: 31926616 PMCID: PMC6926352 DOI: 10.1016/j.redox.2019.101376] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 10/14/2019] [Accepted: 11/06/2019] [Indexed: 02/07/2023] Open
Abstract
Nitro-fatty acids (NO2-FA) are electrophilic lipid mediators derived from unsaturated fatty acid nitration. These species are produced endogenously by metabolic and inflammatory reactions and mediate anti-oxidative and anti-inflammatory responses. NO2-FA have been postulated as partial agonists of the Peroxisome Proliferator-Activated Receptor gamma (PPARγ), which is predominantly expressed in adipocytes and myeloid cells. Herein, we explored molecular and cellular events associated with PPARγ activation by NO2-FA in monocytes and macrophages. NO2-FA induced the expression of two PPARγ reporter genes, Fatty Acid Binding Protein 4 (FABP4) and the scavenger receptor CD36, at early stages of monocyte differentiation into macrophages. These responses were inhibited by the specific PPARγ inhibitor GW9662. Attenuated NO2-FA effects on PPARγ signaling were observed once cells were differentiated into macrophages, with a significant but lower FABP4 upregulation, and no induction of CD36. Using in vitro and in silico approaches, we demonstrated that NO2-FA bind to FABP4. Furthermore, the inhibition of monocyte FA binding by FABP4 diminished NO2-FA-induced upregulation of reporter genes that are transcriptionally regulated by PPARγ, Keap1/Nrf2 and HSF1, indicating that FABP4 inhibition mitigates NO2-FA signaling actions. Overall, our results affirm that NO2-FA activate PPARγ in monocytes and upregulate FABP4 expression, thus promoting a positive amplification loop for the downstream signaling actions of this mediator.
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Affiliation(s)
- M Lamas Bervejillo
- Laboratorio de Inmunología, Instituto de Higiene, Facultad de Ciencias/Facultad de Química, Universidad de la República (UdelaR), Montevideo, CP 11600, Uruguay
| | - J Bonanata
- Laboratorio de Química Teórica y Computacional, Instituto de Química Biológica, Facultad de Ciencias, UdelaR, Montevideo, CP 11400, Uruguay; Centro de Investigaciones Biomédicas (CeInBio), UdelaR, Montevideo, CP 11800, Uruguay
| | - G R Franchini
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - A Richeri
- Laboratorio de Biología Celular, Departamento de Neurofarmacología Experimental, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, CP 11600, Uruguay
| | - J M Marqués
- Laboratorio de Investigación en Vacunas, Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, UdelaR, Montevideo, CP 11600, Uruguay
| | - B A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - F J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - E L Coitiño
- Laboratorio de Química Teórica y Computacional, Instituto de Química Biológica, Facultad de Ciencias, UdelaR, Montevideo, CP 11400, Uruguay; Centro de Investigaciones Biomédicas (CeInBio), UdelaR, Montevideo, CP 11800, Uruguay.
| | - B Córsico
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - H Rubbo
- Centro de Investigaciones Biomédicas (CeInBio), UdelaR, Montevideo, CP 11800, Uruguay; Departamento de Bioquímica, Facultad de Medicina, UdelaR, Montevideo, CP 11800, Uruguay
| | - A M Ferreira
- Laboratorio de Inmunología, Instituto de Higiene, Facultad de Ciencias/Facultad de Química, Universidad de la República (UdelaR), Montevideo, CP 11600, Uruguay.
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20
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Möller MN, Rios N, Trujillo M, Radi R, Denicola A, Alvarez B. Detection and quantification of nitric oxide-derived oxidants in biological systems. J Biol Chem 2019; 294:14776-14802. [PMID: 31409645 DOI: 10.1074/jbc.rev119.006136] [Citation(s) in RCA: 96] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The free radical nitric oxide (NO•) exerts biological effects through the direct and reversible interaction with specific targets (e.g. soluble guanylate cyclase) or through the generation of secondary species, many of which can oxidize, nitrosate or nitrate biomolecules. The NO•-derived reactive species are typically short-lived, and their preferential fates depend on kinetic and compartmentalization aspects. Their detection and quantification are technically challenging. In general, the strategies employed are based either on the detection of relatively stable end products or on the use of synthetic probes, and they are not always selective for a particular species. In this study, we describe the biologically relevant characteristics of the reactive species formed downstream from NO•, and we discuss the approaches currently available for the analysis of NO•, nitrogen dioxide (NO2 •), dinitrogen trioxide (N2O3), nitroxyl (HNO), and peroxynitrite (ONOO-/ONOOH), as well as peroxynitrite-derived hydroxyl (HO•) and carbonate anion (CO3 •-) radicals. We also discuss the biological origins of and analytical tools for detecting nitrite (NO2 -), nitrate (NO3 -), nitrosyl-metal complexes, S-nitrosothiols, and 3-nitrotyrosine. Moreover, we highlight state-of-the-art methods, alert readers to caveats of widely used techniques, and encourage retirement of approaches that have been supplanted by more reliable and selective tools for detecting and measuring NO•-derived oxidants. We emphasize that the use of appropriate analytical methods needs to be strongly grounded in a chemical and biochemical understanding of the species and mechanistic pathways involved.
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Affiliation(s)
- Matías N Möller
- Laboratorio de Fisicoquímica Biológica, Facultad de Ciencias, Universidad de la República, 11400 Montevideo, Uruguay.,Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Natalia Rios
- Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay.,Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Madia Trujillo
- Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay.,Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Rafael Radi
- Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay.,Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Ana Denicola
- Laboratorio de Fisicoquímica Biológica, Facultad de Ciencias, Universidad de la República, 11400 Montevideo, Uruguay.,Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Beatriz Alvarez
- Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay .,Laboratorio de Enzimología, Facultad de Ciencias, Universidad de la República, 11400 Montevideo, Uruguay
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21
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Schopfer FJ, Khoo NKH. Nitro-Fatty Acid Logistics: Formation, Biodistribution, Signaling, and Pharmacology. Trends Endocrinol Metab 2019; 30:505-519. [PMID: 31196614 PMCID: PMC7121905 DOI: 10.1016/j.tem.2019.04.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/25/2019] [Accepted: 04/25/2019] [Indexed: 02/04/2023]
Abstract
In addition to supporting cellular energetic demands and providing building blocks for lipid synthesis, fatty acids (FAs) are precursors of potent signaling molecules. In particular, the presence of conjugated double bonds on the fatty-acyl chain provides a preferential target for nitration generating nitro-FAs (NO2-FAs). The formation of NO2-FAs is a nonenzymatic process that requires reactive nitrogen species and occurs locally at the site of inflammation or during gastric acidification. NO2-FAs are electrophilic and display pleiotropic signaling actions through reversible protein alkylation. This review focuses on the endogenously formed NO2-FAs' mechanism of absorption, systemic distribution, signaling, and preclinical models. Understanding the dynamics of these processes will facilitate targeted dietary interventions and further the current pharmacological development aimed at low-grade inflammatory diseases.
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Affiliation(s)
- Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15213, USA.
| | - Nicholas K H Khoo
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15213, USA.
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22
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Liu T, Zhang M, Mukosera GT, Borchardt D, Li Q, Tipple TE, Ishtiaq Ahmed AS, Power GG, Blood AB. L-NAME releases nitric oxide and potentiates subsequent nitroglycerin-mediated vasodilation. Redox Biol 2019; 26:101238. [PMID: 31200239 PMCID: PMC6565607 DOI: 10.1016/j.redox.2019.101238] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/27/2019] [Accepted: 06/02/2019] [Indexed: 12/22/2022] Open
Abstract
L-NG-Nitro arginine methyl ester (L-NAME) has been widely applied for several decades in both basic and clinical research as an antagonist of nitric oxide synthase (NOS). Herein, we show that L-NAME slowly releases NO from its guanidino nitro group. Daily pretreatment of rats with L-NAME potentiated mesenteric vasodilation induced by nitrodilators such as nitroglycerin, but not by NO. Release of NO also occurred with the NOS-inactive enantiomer D-NAME, but not with L-arginine or another NOS inhibitor L-NMMA, consistent with the presence or absence of a nitro group in their structure and their nitrodilator-potentiating effects. Metabolic conversion of the nitro group to NO-related breakdown products was confirmed using isotopically-labeled L-NAME. Consistent with Fenton chemistry, transition metals and reactive oxygen species accelerated the release of NO from L-NAME. Both NO production from L-NAME and its nitrodilator-potentiating effects were augmented under inflammation. NO release by L-NAME can confound its intended NOS-inhibiting effects, possibly by contributing to a putative intracellular NO store in the vasculature. NOS-inhibitor L-NAME is also a precursor of NO. ROS releases NO from the nitro group of L-NAME via Fenton Chemistry. L-NAME potentates nitrodilator-mediated vasodilation. Nitroglycerin may cause vasodilation via activation of an intracellular NO store.
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Affiliation(s)
- Taiming Liu
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - Meijuan Zhang
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - George T Mukosera
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - Dan Borchardt
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Qian Li
- Neonatal Redox Biology Laboratory, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Trent E Tipple
- Neonatal Redox Biology Laboratory, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | | | - Gordon G Power
- Lawrence D. Longo Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - Arlin B Blood
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA; Lawrence D. Longo Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA.
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Zatloukalova M, Mojovic M, Pavicevic A, Kabelac M, Freeman BA, Pekarova M, Vacek J. Redox properties and human serum albumin binding of nitro-oleic acid. Redox Biol 2019; 24:101213. [PMID: 31170679 PMCID: PMC6554544 DOI: 10.1016/j.redox.2019.101213] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/30/2019] [Accepted: 05/01/2019] [Indexed: 12/27/2022] Open
Abstract
Nitro-fatty acids modulate inflammatory and metabolic stress responses, thus displaying potential as new drug candidates. Herein, we evaluate the redox behavior of nitro-oleic acid (NO2-OA) and its ability to bind to the fatty acid transporter human serum albumin (HSA). The nitro group of NO2-OA underwent electrochemical reduction at -0.75 V at pH 7.4 in an aqueous milieu. Based on observations of the R-NO2 reduction process, the stability and reactivity of NO2-OA was measured in comparison to oleic acid (OA) as the negative control. These electrochemically-based results were reinforced by computational quantum mechanical modeling. DFT calculations indicated that both the C9-NO2 and C10-NO2 positional isomers of NO2-OA occurred in two conformers with different internal angles (69° and 110°) between the methyl- and carboxylate termini. Both NO2-OA positional isomers have LUMO energies of around -0.7 eV, affirming the electrophilic properties of fatty acid nitroalkenes. In addition, the binding of NO2-OA and OA with HSA revealed a molar ratio of ~7:1 [NO2-OA]:[HSA]. These binding experiments were performed using both an electrocatalytic approach and electron paramagnetic resonance (EPR) spectroscopy using 16-doxyl stearic acid. Using a Fe(DTCS)2 spin-trap, EPR studies also showed that the release of the nitro moiety of NO2-OA resulted in the formation of nitric oxide radical. Finally, the interaction of NO2-OA with HSA was monitored via Tyr and Trp residue electro-oxidation. The results indicate that not only non-covalent binding but also NO2-OA-HSA adduction mechanisms should be taken into consideration. This study of the redox properties of NO2-OA is applicable to the characterization of other electrophilic mediators of biological and pharmacological relevance.
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Affiliation(s)
- Martina Zatloukalova
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc 775 15, Czech Republic
| | - Milos Mojovic
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia
| | - Aleksandra Pavicevic
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia
| | - Martin Kabelac
- Department of Chemistry, Faculty of Science, University of South Bohemia, Branisovska 31, Ceske Budejovice 370 05, Czech Republic
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh PA, 15261, USA
| | - Michaela Pekarova
- The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, Brno 612 65, Czech Republic
| | - Jan Vacek
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc 775 15, Czech Republic; The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, Brno 612 65, Czech Republic.
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24
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Aranda-Caño L, Sánchez-Calvo B, Begara-Morales JC, Chaki M, Mata-Pérez C, Padilla MN, Valderrama R, Barroso JB. Post-Translational Modification of Proteins Mediated by Nitro-Fatty Acids in Plants: Nitroalkylation. PLANTS 2019; 8:plants8040082. [PMID: 30934982 PMCID: PMC6524050 DOI: 10.3390/plants8040082] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 03/25/2019] [Accepted: 03/26/2019] [Indexed: 12/28/2022]
Abstract
Nitrate fatty acids (NO₂-FAs) are considered reactive lipid species derived from the non-enzymatic oxidation of polyunsaturated fatty acids by nitric oxide (NO) and related species. Nitrate fatty acids are powerful biological electrophiles which can react with biological nucleophiles such as glutathione and certain protein⁻amino acid residues. The adduction of NO₂-FAs to protein targets generates a reversible post-translational modification called nitroalkylation. In different animal and human systems, NO₂-FAs, such as nitro-oleic acid (NO₂-OA) and conjugated nitro-linoleic acid (NO₂-cLA), have cytoprotective and anti-inflammatory influences in a broad spectrum of pathologies by modulating various intracellular pathways. However, little knowledge on these molecules in the plant kingdom exists. The presence of NO₂-OA and NO₂-cLA in olives and extra-virgin olive oil and nitro-linolenic acid (NO₂-Ln) in Arabidopsis thaliana has recently been detected. Specifically, NO₂-Ln acts as a signaling molecule during seed and plant progression and beneath abiotic stress events. It can also release NO and modulate the expression of genes associated with antioxidant responses. Nevertheless, the repercussions of nitroalkylation on plant proteins are still poorly known. In this review, we demonstrate the existence of endogenous nitroalkylation and its effect on the in vitro activity of the antioxidant protein ascorbate peroxidase.
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Affiliation(s)
- Lorena Aranda-Caño
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, University Campus Las Lagunillas, University of Jaén, E-23071 Jaén, Spain.
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25
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Monzani E, Nicolis S, Dell'Acqua S, Capucciati A, Bacchella C, Zucca FA, Mosharov EV, Sulzer D, Zecca L, Casella L. Dopamin, oxidativer Stress und Protein‐Chinonmodifikationen bei Parkinson und anderen neurodegenerativen Erkrankungen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201811122] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Enrico Monzani
- Department of ChemistryUniversity of Pavia 27100 Pavia Italien
| | | | | | | | | | - Fabio A. Zucca
- Institute of Biomedical TechnologiesNational Research Council of Italy Segrate (Mailand) Italien
| | - Eugene V. Mosharov
- Department of PsychiatryColumbia University Medical CenterNew York State Psychiatric Institute New York NY USA
- Departments Neurology, PharmacologyColumbia University Medical Center New York NY USA
| | - David Sulzer
- Department of PsychiatryColumbia University Medical CenterNew York State Psychiatric Institute New York NY USA
- Departments Neurology, PharmacologyColumbia University Medical Center New York NY USA
| | - Luigi Zecca
- Institute of Biomedical TechnologiesNational Research Council of Italy Segrate (Mailand) Italien
- Department of PsychiatryColumbia University Medical CenterNew York State Psychiatric Institute New York NY USA
| | - Luigi Casella
- Department of ChemistryUniversity of Pavia 27100 Pavia Italien
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26
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Monzani E, Nicolis S, Dell'Acqua S, Capucciati A, Bacchella C, Zucca FA, Mosharov EV, Sulzer D, Zecca L, Casella L. Dopamine, Oxidative Stress and Protein-Quinone Modifications in Parkinson's and Other Neurodegenerative Diseases. Angew Chem Int Ed Engl 2019; 58:6512-6527. [PMID: 30536578 DOI: 10.1002/anie.201811122] [Citation(s) in RCA: 144] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 12/10/2018] [Indexed: 12/19/2022]
Abstract
Dopamine (DA) is the most important catecholamine in the brain, as it is the most abundant and the precursor of other neurotransmitters. Degeneration of nigrostriatal neurons of substantia nigra pars compacta in Parkinson's disease represents the best-studied link between DA neurotransmission and neuropathology. Catecholamines are reactive molecules that are handled through complex control and transport systems. Under normal conditions, small amounts of cytosolic DA are converted to neuromelanin in a stepwise process involving melanization of peptides and proteins. However, excessive cytosolic or extraneuronal DA can give rise to nonselective protein modifications. These reactions involve DA oxidation to quinone species and depend on the presence of redox-active transition metal ions such as iron and copper. Other oxidized DA metabolites likely participate in post-translational protein modification. Thus, protein-quinone modification is a heterogeneous process involving multiple DA-derived residues that produce structural and conformational changes of proteins and can lead to aggregation and inactivation of the modified proteins.
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Affiliation(s)
- Enrico Monzani
- Department of Chemistry, University of Pavia, 27100, Pavia, Italy
| | - Stefania Nicolis
- Department of Chemistry, University of Pavia, 27100, Pavia, Italy
| | | | | | - Chiara Bacchella
- Department of Chemistry, University of Pavia, 27100, Pavia, Italy
| | - Fabio A Zucca
- Institute of Biomedical Technologies, National Research Council of Italy, Segrate (Milano), Italy
| | - Eugene V Mosharov
- Department of Psychiatry, Columbia University Medical Center, New York State Psychiatric Institute, New York, NY, USA
| | - David Sulzer
- Department of Psychiatry, Columbia University Medical Center, New York State Psychiatric Institute, New York, NY, USA.,Departments of Neurology and Pharmacology, Columbia University Medical Center, New York, NY, USA
| | - Luigi Zecca
- Institute of Biomedical Technologies, National Research Council of Italy, Segrate (Milano), Italy.,Department of Psychiatry, Columbia University Medical Center, New York State Psychiatric Institute, New York, NY, USA
| | - Luigi Casella
- Department of Chemistry, University of Pavia, 27100, Pavia, Italy
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27
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Hughan KS, Wendell SG, Delmastro-Greenwood M, Helbling N, Corey C, Bellavia L, Potti G, Grimes G, Goodpaster B, Kim-Shapiro DB, Shiva S, Freeman BA, Gladwin MT. Conjugated Linoleic Acid Modulates Clinical Responses to Oral Nitrite and Nitrate. Hypertension 2019; 70:634-644. [PMID: 28739973 DOI: 10.1161/hypertensionaha.117.09016] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Dietary NO3- (nitrate) and NO2- (nitrite) support ˙NO (nitric oxide) generation and downstream vascular signaling responses. These nitrogen oxides also generate secondary nitrosating and nitrating species that react with low molecular weight thiols, heme centers, proteins, and unsaturated fatty acids. To explore the kinetics of NO3-and NO2-metabolism and the impact of dietary lipid on nitrogen oxide metabolism and cardiovascular responses, the stable isotopes Na15NO3 and Na15NO2 were orally administered in the presence or absence of conjugated linoleic acid (cLA). The reduction of 15NO2- to 15NO was indicated by electron paramagnetic resonance spectroscopy detection of hyperfine splitting patterns reflecting 15NO-deoxyhemoglobin complexes. This formation of 15NO also translated to decreased systolic and mean arterial blood pressures and inhibition of platelet function. Upon concurrent administration of cLA, there was a significant increase in plasma cLA nitration products 9- and 12-15NO2-cLA. Coadministration of cLA with 15NO2- also impacted the pharmacokinetics and physiological effects of 15NO2-, with cLA administration suppressing plasma NO3-and NO2-levels, decreasing 15NO-deoxyhemoglobin formation, NO2-inhibition of platelet activation, and the vasodilatory actions of NO2-, while enhancing the formation of 9- and 12-15NO2-cLA. These results indicate that the biochemical reactions and physiological responses to oral 15NO3-and 15NO2-are significantly impacted by dietary constituents, such as unsaturated lipids. This can explain the variable responses to NO3-and NO2-supplementation in clinical trials and reveals dietary strategies for promoting the generation of pleiotropic nitrogen oxide-derived lipid signaling mediators. Clinical Trial Registration- URL: http://www.clinicaltrials.gov . Unique identifier: NCT01681836.
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Affiliation(s)
- Kara S Hughan
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Stacy Gelhaus Wendell
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Meghan Delmastro-Greenwood
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Nicole Helbling
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Catherine Corey
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Landon Bellavia
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Gopal Potti
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - George Grimes
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Bret Goodpaster
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Daniel B Kim-Shapiro
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Sruti Shiva
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Bruce A Freeman
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
| | - Mark T Gladwin
- From the Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes (K.S.H.), Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute (K.S.H., S.G.W., M.D.-G., N.H., C.C., S.S., B.A.F., M.T.G.), Department of Pharmacology and Chemical Biology (S.G.W., M.D.-G., S.S., B.A.F.), Department of Medicine, Division of Endocrinology (N.H., B.G.), and Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, PA (M.T.G.); Department of Physics, Wake Forest University, Winston Salem, NC (L.B., D.B.K.-S.); and Pharmaceutical Development Section, Department of Pharmacy, Clinical Center, National Institutes of Health, Bethesda, MD (G.P., G.G.)
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28
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Hansen AL, Mukai K, Schopfer FJ, Taguchi T, Holm CK. STING palmitoylation as a therapeutic target. Cell Mol Immunol 2019; 16:236-241. [PMID: 30796349 PMCID: PMC6460494 DOI: 10.1038/s41423-019-0205-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 01/18/2019] [Indexed: 01/07/2023] Open
Abstract
Gain-of-function mutations in the STING-encoding gene TMEM173 are central to the pathology of the autoinflammatory disorder STING-associated vasculopathy with onset in infancy (SAVI). Furthermore, excessive activity of the STING signaling pathway is associated with autoinflammatory diseases, including systemic lupus erythematosus and Aicardi–Goutières syndrome (AGS). Two independent studies recently identified pharmacological inhibitors of STING. Strikingly, both types of compounds are reactive nitro-containing electrophiles that target STING palmitoylation, a posttranslational modification necessary for STING signaling. As a consequence, the activation of downstream signaling molecules and the induction of type I interferons were inhibited. The compounds were effective at ameliorating inflammation in a mouse model of AGS and in blocking the production of type I interferons in primary fibroblasts from SAVI patients. This mini-review focuses on the roles of palmitoylation in STING activation and signaling and as a pharmaceutical target for drug development.
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Affiliation(s)
| | - Kojiro Mukai
- Laboratory of Organelle Pathophysiology, Department of Integrative Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, 980-8578, Miyagi, Japan
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Tomohiko Taguchi
- Laboratory of Organelle Pathophysiology, Department of Integrative Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, 980-8578, Miyagi, Japan.
| | - Christian K Holm
- Department of Biomedicine, Aarhus University, 8000, Aarhus C, Denmark.
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29
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Rodriguez-Duarte J, Galliussi G, Dapueto R, Rossello J, Malacrida L, Kamaid A, Schopfer FJ, Escande C, López GV, Batthyány C. A novel nitroalkene-α-tocopherol analogue inhibits inflammation and ameliorates atherosclerosis in Apo E knockout mice. Br J Pharmacol 2019; 176:757-772. [PMID: 30588602 DOI: 10.1111/bph.14561] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 11/30/2018] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND AND PURPOSE Atherosclerosis is characterized by chronic low-grade inflammation with concomitant lipid accumulation in the arterial wall. Anti-inflammatory and anti-atherogenic properties have been described for a novel class of endogenous nitroalkenes (nitrated-unsaturated fatty acids), formed during inflammation and digestion/absorption processes. The lipid-associated antioxidant α-tocopherol is transported systemically by LDL particles including to the atheroma lesions. To capitalize on the overlapping and complementary salutary properties of endogenous nitroalkenes and α-tocopherol, we designed and synthesized a novel nitroalkene-α-tocopherol analogue (NATOH) to address chronic inflammation and atherosclerosis, particularly at the lesion sites. EXPERIMENTAL APPROACH We synthesized NATOH, determined its electrophilicity and antioxidant capacity and studied its effects over pro-inflammatory and cytoprotective pathways in macrophages in vitro. Moreover, we demonstrated its incorporation into lipoproteins and tissue both in vitro and in vivo, and determined its effect on atherosclerosis and inflammatory responses in vivo using the Apo E knockout mice model. KEY RESULTS NATOH exhibited similar antioxidant capacity to α-tocopherol and, due to the presence of the nitroalkenyl group, like endogenous nitroalkenes, it exerted electrophilic reactivity. NATOH was incorporated in vivo into the VLDL/LDL lipoproteins particles to reach the atheroma lesions. Furthermore, oral administration of NATOH down-regulated NF-κB-dependent expression of pro-inflammatory markers (including IL-1β and adhesion molecules) and ameliorated atherosclerosis in Apo E knockout mice. CONCLUSIONS AND IMPLICATIONS In toto, the data demonstrate a novel pharmacological strategy for the prevention of atherosclerosis based on a creative, natural and safe drug delivery system of a non-conventional anti-inflammatory compound (NATOH) with significant potential for clinical application.
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Affiliation(s)
- Jorge Rodriguez-Duarte
- Laboratory of Vascular Biology and Drug Development, INDICYO Program, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Departmento de Química Orgánica, Facultad de Química, Universidad de la República, Montevideo, Uruguay
| | - Germán Galliussi
- Laboratory of Vascular Biology and Drug Development, INDICYO Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Rosina Dapueto
- Laboratory of Vascular Biology and Drug Development, INDICYO Program, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Departmento de Química Orgánica, Facultad de Química, Universidad de la República, Montevideo, Uruguay
| | - Jessica Rossello
- Analytical Biochemistry and Proteomics Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Leonel Malacrida
- Analytical Biochemistry and Proteomics Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Pathophysiology Department, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Andrés Kamaid
- Analytical Biochemistry and Proteomics Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Carlos Escande
- Laboratory of Metabolic Diseases and Aging, INDICYO Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Gloria V López
- Laboratory of Vascular Biology and Drug Development, INDICYO Program, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Departmento de Química Orgánica, Facultad de Química, Universidad de la República, Montevideo, Uruguay
| | - Carlos Batthyány
- Laboratory of Vascular Biology and Drug Development, INDICYO Program, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Analytical Biochemistry and Proteomics Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
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30
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Ng TL, Rohac R, Mitchell AJ, Boal AK, Balskus EP. An N-nitrosating metalloenzyme constructs the pharmacophore of streptozotocin. Nature 2019; 566:94-99. [PMID: 30728519 PMCID: PMC6369591 DOI: 10.1038/s41586-019-0894-z] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 12/12/2018] [Indexed: 12/31/2022]
Abstract
Small molecules containing the N-nitroso group, such as the bacterial natural product streptozotocin, are prominent carcinogens1,2 and important cancer chemotherapeutics3,4. Despite the considerable importance of this functional group to human health, enzymes dedicated to the assembly of the N-nitroso unit have not been identified. Here we show that SznF, a metalloenzyme from the biosynthesis of streptozotocin, catalyses an oxidative rearrangement of the guanidine group of Nω-methyl-L-arginine to generate an N-nitrosourea product. Structural characterization and mutagenesis of SznF reveal two separate active sites that promote distinct steps in this transformation using different iron-containing metallocofactors. This biosynthetic reaction, which has little precedent in enzymology or organic synthesis, expands the catalytic capabilities of non-haem-iron-dependent enzymes to include N-N bond formation. We find that biosynthetic gene clusters that encode SznF homologues are widely distributed among bacteria-including environmental organisms, plant symbionts and human pathogens-which suggests an unexpectedly diverse and uncharacterized microbial reservoir of bioactive N-nitroso metabolites.
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Affiliation(s)
- Tai L Ng
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Roman Rohac
- Department of Chemistry, The Pennsylvania State University, University Park, PA, USA
| | - Andrew J Mitchell
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
| | - Amie K Boal
- Department of Chemistry, The Pennsylvania State University, University Park, PA, USA.
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA.
| | - Emily P Balskus
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.
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31
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Fazzari M, Vitturi DA, Woodcock SR, Salvatore SR, Freeman BA, Schopfer FJ. Electrophilic fatty acid nitroalkenes are systemically transported and distributed upon esterification to complex lipids. J Lipid Res 2018; 60:388-399. [PMID: 30545956 DOI: 10.1194/jlr.m088815] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 12/10/2018] [Indexed: 12/28/2022] Open
Abstract
Electrophilic nitro-fatty acids [NO2-FAs (fatty acid nitroalkenes)] showed beneficial signaling actions in preclinical studies and safety in phase 1 clinical trials. A detailed description of the pharmacokinetics (PK) of NO2-FAs is complicated by the capability of electrophilic fatty acids to alkylate thiols reversibly and become esterified in various complex lipids, and the instability of the nitroalkene moiety during enzymatic and base hydrolysis. Herein, we report the mechanism and kinetics of absorption, metabolism, and distribution of the endogenously detectable and prototypical NO2-FA, 10-nitro-oleic acid (10-NO2-OA), in dogs after oral administration. Supported by HPLC-high-resolution-MS/MS analysis of synthetic and plasma-derived 10-NO2-OA-containing triacylglycerides (TAGs), we show that a key mechanism of NO2-FA distribution is an initial esterification into complex lipids. Quantitative analysis of plasma free and esterified lipid fractions confirmed time-dependent preferential incorporation of 10-NO2-OA into TAGs when compared with its principal metabolite, 10-nitro-stearic acid. Finally, new isomers of 10-NO2-OA were identified in vivo, and their electrophilic reactivity and metabolism characterized. Overall, we reveal that NO2-FAs display unique PK, with the principal mechanism of tissue distribution involving complex lipid esterification, which serves to shield the electrophilic character of this mediator from plasma and hepatic inactivation and thus permits efficient distribution to target organs.
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Affiliation(s)
- Marco Fazzari
- Fondazione Ri.MED, 90133 Palermo, Italy .,Department of Pharmacology and Chemical Biology University of Pittsburgh, Pittsburgh, PA 15261
| | - Dario A Vitturi
- Department of Pharmacology and Chemical Biology University of Pittsburgh, Pittsburgh, PA 15261
| | - Steven R Woodcock
- Department of Pharmacology and Chemical Biology University of Pittsburgh, Pittsburgh, PA 15261
| | - Sonia R Salvatore
- Department of Pharmacology and Chemical Biology University of Pittsburgh, Pittsburgh, PA 15261
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology University of Pittsburgh, Pittsburgh, PA 15261
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology University of Pittsburgh, Pittsburgh, PA 15261
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32
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Nitro-fatty acids are formed in response to virus infection and are potent inhibitors of STING palmitoylation and signaling. Proc Natl Acad Sci U S A 2018; 115:E7768-E7775. [PMID: 30061387 PMCID: PMC6099880 DOI: 10.1073/pnas.1806239115] [Citation(s) in RCA: 162] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Several chronic inflammatory conditions have recently been shown to depend on abnormally high activity of the signaling protein stimulator of IFN genes (STING). These conditions include examples from systemic lupus erythematosus, Aicardi–Goutiéres syndrome, and STING-associated vasculopathy with onset in infancy. The involvement of STING in these diseases points to an unmet demand to identify inhibitors of STING signaling, which could form the basis of anti-STING therapeutics. With this report, we identify distinct endogenously formed lipid species as potent inhibitors of STING signaling—and propose that these lipids could have pharmaceutical potential for treatment of STING-dependent inflammatory diseases. The adaptor molecule stimulator of IFN genes (STING) is central to production of type I IFNs in response to infection with DNA viruses and to presence of host DNA in the cytosol. Excessive release of type I IFNs through STING-dependent mechanisms has emerged as a central driver of several interferonopathies, including systemic lupus erythematosus (SLE), Aicardi–Goutières syndrome (AGS), and stimulator of IFN genes-associated vasculopathy with onset in infancy (SAVI). The involvement of STING in these diseases points to an unmet need for the development of agents that inhibit STING signaling. Here, we report that endogenously formed nitro-fatty acids can covalently modify STING by nitro-alkylation. These nitro-alkylations inhibit STING palmitoylation, STING signaling, and subsequently, the release of type I IFN in both human and murine cells. Furthermore, treatment with nitro-fatty acids was sufficient to inhibit production of type I IFN in fibroblasts derived from SAVI patients with a gain-of-function mutation in STING. In conclusion, we have identified nitro-fatty acids as endogenously formed inhibitors of STING signaling and propose for these lipids to be considered in the treatment of STING-dependent inflammatory diseases.
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33
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Buchan GJ, Bonacci G, Fazzari M, Salvatore SR, Gelhaus Wendell S. Nitro-fatty acid formation and metabolism. Nitric Oxide 2018; 79:38-44. [PMID: 30006146 DOI: 10.1016/j.niox.2018.07.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 06/29/2018] [Accepted: 07/03/2018] [Indexed: 12/16/2022]
Abstract
Nitro-fatty acids (NO2-FA) are pleiotropic modulators of redox signaling pathways. Their effects on inflammatory signaling have been studied in great detail in cell, animal and clinical models primarily using exogenously administered nitro-oleic acid. While we know a considerable amount regarding NO2-FA signaling, endogenous formation and metabolism is relatively unexplored. This review will cover what is currently known regarding the proposed mechanisms of NO2-FA formation, dietary modulation of endogenous NO2-FA levels, pathways of NO2-FA metabolism and the detection of NO2-FA and corresponding metabolites.
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Affiliation(s)
- Gregory J Buchan
- Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Gustavo Bonacci
- CIBICI - CONICET, Departamento de Bioquímica Clínica Facultad de Ciencias Químicas, (U.N.C.), Haya de la Torre y Medina Allende Ciudad Universitaria, Córdoba C.P. N°: X5000HUA, Argentina
| | - Marco Fazzari
- Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Fondazione Ri.MED, Via Bandiera 11, 90133 Palermo, Italy
| | - Sonia R Salvatore
- Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Stacy Gelhaus Wendell
- Department of Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Clinical Translational Science Institute, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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34
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Freeman BA, O'Donnell VB, Schopfer FJ. The discovery of nitro-fatty acids as products of metabolic and inflammatory reactions and mediators of adaptive cell signaling. Nitric Oxide 2018; 77:106-111. [PMID: 29742447 DOI: 10.1016/j.niox.2018.05.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 05/04/2018] [Indexed: 01/06/2023]
Abstract
Foundational advances in eicosanoid signaling, the free radical biology of oxygen and nitric oxide and mass spectrometry all converged to enable the discovery of nitrated unsaturated fatty acids. Due to the unique biochemical characteristics of fatty acid nitroalkenes, these species undergo rapid and reversible Michael addition of biological nucleophiles such as cysteine, leading to the post-translational modification of low molecular weight and protein thiols. This capability has led to the present understanding that nitro-fatty acid reaction with the alkylation-sensitive cysteine proteome leads to physiologically-beneficial alterations in transcriptional regulatory protein function, gene expression and in vivo rodent model responses to metabolic and inflammatory stress. These findings motivated the preclinical and clinical development of nitro-fatty acids as new drug candidates for treating acute and chronic metabolic and inflammatory disorders.
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Affiliation(s)
- Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Valerie B O'Donnell
- Systems Immunity Research Institute and Division of Infection and Immunity, Cardiff University, Cardiff, UK
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA.
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35
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Hanff E, Zinke M, Böhmer A, Niebuhr J, Maassen M, Endeward V, Maassen N, Tsikas D. GC-MS determination of nitrous anhydrase activity of bovine and human carbonic anhydrase II and IV. Anal Biochem 2018; 550:132-136. [PMID: 29729279 DOI: 10.1016/j.ab.2018.05.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 04/30/2018] [Accepted: 05/01/2018] [Indexed: 12/21/2022]
Abstract
The most widely recognized activity of the large family of the metalloenzyme carbonic anhydrases (CAs) is the diffusion-controlled hydration of CO2 to HCO3- and one proton, and the less rapid dehydration of HCO3- to CO2: CO2 + H2O ⇆ HCO3- + H+. CAs also catalyze the reaction of water with other electrophiles such as aromatic esters, sulfates and phosphates, thus contributing to lending to CAs esterase, sulfatase and phosphatase activity, respectively. Renal CAII and CAIV are involved in the reabsorption of nitrite, the autoxidation product of the signalling molecule nitric oxide (NO): 4 NO + O2 + 2 H2O → 4 ONO- + 4 H+. Bovine and human CAII and CAIV have been reported to exert nitrite reductase and nitrous anhydride activity: 2 NO2- + 2 H+ ⇆ [2 HONO] ⇆ N2O3 + H2O. In the presence of L-cysteine, NO may be formed. In the literature, these issues are controversial, mainly due to analytical shortcomings, i.e., the inability to detect authentic HONO and N2O3. Here, we present a gas chromatography-mass spectrometry (GC-MS) assay to unambiguously detect and quantify the nitrous anhydrase activity of CAs. The assay is based on the hydrolysis of N2O3 in H218O to form ON18O- and 18ON18O-. After pentafluorobenzyl bromide derivatization and electron capture negative-ion chemical ionization of the pentafluorobenzyl nitro derivatives, quantification is performed by selected-ion monitoring of the anions with mass-to-charge (m/z) ratios of 46 (ONO-), m/z 48 (ON18O- and 18ONO-), m/z 50 (18ON18O-) and m/z 47 (O15NO-, internal standard).
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Affiliation(s)
- Erik Hanff
- Institute of Toxicology, Core Unit Proteomics, Hannover Medical School, Hannover, Germany
| | - Maximilian Zinke
- Institute of Toxicology, Core Unit Proteomics, Hannover Medical School, Hannover, Germany
| | - Anke Böhmer
- Institute of Toxicology, Core Unit Proteomics, Hannover Medical School, Hannover, Germany
| | - Janine Niebuhr
- Institute of Toxicology, Core Unit Proteomics, Hannover Medical School, Hannover, Germany
| | - Mirja Maassen
- Institute of Sport Medicine, Hannover Medical School, Hannover, Germany; Institute of Sport Science, Leibniz University Hannover, Hannover, Germany
| | - Volker Endeward
- Institute of Vegetative Physiology, Hannover Medical School, Germany
| | - Norbert Maassen
- Institute of Sport Medicine, Hannover Medical School, Hannover, Germany
| | - Dimitrios Tsikas
- Institute of Toxicology, Core Unit Proteomics, Hannover Medical School, Hannover, Germany.
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36
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Turell L, Steglich M, Alvarez B. The chemical foundations of nitroalkene fatty acid signaling through addition reactions with thiols. Nitric Oxide 2018; 78:S1089-8603(17)30305-1. [PMID: 29578058 DOI: 10.1016/j.niox.2018.03.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 03/19/2018] [Accepted: 03/21/2018] [Indexed: 11/30/2022]
Abstract
Nitroalkene fatty acids can be formed in vivo and administered exogenously. They exert pleiotropic signaling actions with cytoprotective and antiinflammatory effects. The presence of the potent electron withdrawing nitro group confers electrophilicity to the adjacent β-carbon. Thiols (precisely, thiolates) are strong nucleophiles and can react with nitroalkene fatty acids through reversible Michael addition reactions. In addition, nitroalkene fatty acids can undergo several other processes including metabolic oxidation, reduction, esterification, nitric oxide release and partition into hydrophobic compartments. The signaling actions of nitroalkenes are mainly mediated by reactions with critical thiols in regulatory proteins. Thus, the thio-Michael addition reaction provides a framework for understanding the molecular basis of the biological effects of nitroalkene fatty acids at the crossroads of thiol signaling and electrophilic lipid signaling. In this review, we describe the reactions of nitroalkene fatty acids in biological contexts. We focus on the Michael addition-elimination reaction with thiols and its mechanism, and extrapolate kinetic and thermodynamic considerations to in vivo settings.
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Affiliation(s)
- Lucía Turell
- Laboratorio de Enzimología, Facultad de Ciencias and Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo, Uruguay.
| | - Martina Steglich
- Laboratorio de Enzimología, Facultad de Ciencias and Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo, Uruguay
| | - Beatriz Alvarez
- Laboratorio de Enzimología, Facultad de Ciencias and Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo, Uruguay
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37
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Rom O, Khoo NKH, Chen YE, Villacorta L. Inflammatory signaling and metabolic regulation by nitro-fatty acids. Nitric Oxide 2018; 78:S1089-8603(17)30329-4. [PMID: 29578057 PMCID: PMC6151155 DOI: 10.1016/j.niox.2018.03.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 03/19/2018] [Accepted: 03/21/2018] [Indexed: 02/06/2023]
Abstract
The addition of nitrogen dioxide (NO2) to the double bond of unsaturated fatty acids yields an array of electrophilic nitro-fatty acids (NO2-FA) with unique biochemical and signaling properties. During the last decade, NO2-FA have been shown to exert a protective role in various inflammatory and metabolic disorders. NO2-FA exert their biological effects primarily by regulating two central physiological adaptive responses: the canonical inflammatory signaling and metabolic pathways. In this mini-review, we summarize current knowledge on the regulatory role of NO2-FA in the inflammatory and metabolic response via regulation of nuclear factor kappa B (NF-κB) and peroxisome proliferator-activated receptor γ (PPARγ), master regulators of inflammation and metabolism. Moreover, the engagement of novel signaling and metabolic pathways influenced by NO2-FA, beyond NF-κB and PPAR signaling, is discussed herein.
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Affiliation(s)
- Oren Rom
- Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan, USA
| | - Nicholas K H Khoo
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, USA
| | - Y Eugene Chen
- Department of Cardiac Surgery, Frankel Cardiovascular Center, University of Michigan, USA
| | - Luis Villacorta
- Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan, USA.
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38
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Liu T, Zhang M, Terry MH, Schroeder H, Wilson SM, Power GG, Li Q, Tipple TE, Borchardt D, Blood AB. Nitrite potentiates the vasodilatory signaling of S-nitrosothiols. Nitric Oxide 2018; 75:60-69. [PMID: 29428841 DOI: 10.1016/j.niox.2018.01.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 01/30/2018] [Accepted: 01/31/2018] [Indexed: 12/27/2022]
Abstract
Nitrite and S-nitrosothiols (SNOs) are both byproducts of nitric oxide (NO) metabolism and are proposed to cause vasodilation via activation of soluble guanylate cyclase (sGC). We have previously reported that while SNOs are potent vasodilators at physiological concentrations, nitrite itself only produces vasodilation at supraphysiological concentrations. Here, we tested the hypothesis that sub-vasoactive concentrations of nitrite potentiate the vasodilatory effects of SNOs. Multiple exposures of isolated sheep arteries to S-nitroso-glutathione (GSNO) resulted in a tachyphylactic decreased vasodilatory response to GSNO but not to NO, suggesting attenuation of signaling steps upstream from sGC. Exposure of arteries to 1 μM nitrite potentiated the vasodilatory effects of GSNO in naive arteries and abrogated the tachyphylactic response to GSNO in pre-exposed arteries, suggesting that nitrite facilitates GSNO-mediated activation of sGC. In intact anesthetized sheep and rats, inhibition of NO synthases to decrease plasma nitrite levels attenuated vasodilatory responses to exogenous infusions of GSNO, an effect that was reversed by exogenous infusion of nitrite at sub-vasodilating levels. This study suggests nitrite potentiates SNO-mediated vasodilation via a mechanism that lies upstream from activation of sGC.
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Affiliation(s)
- Taiming Liu
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Meijuan Zhang
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Michael H Terry
- Department of Respiratory Care, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Hobe Schroeder
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Sean M Wilson
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Gordon G Power
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Qian Li
- Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Trent E Tipple
- Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Dan Borchardt
- Department of Chemistry, University of California, Riverside, CA 92521, United States
| | - Arlin B Blood
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States; Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States.
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39
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Electrophilic fatty acid nitroalkenes regulate Nrf2 and NF-κB signaling:A medicinal chemistry investigation of structure-function relationships. Sci Rep 2018; 8:2295. [PMID: 29396403 PMCID: PMC5797128 DOI: 10.1038/s41598-018-20460-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 01/18/2018] [Indexed: 02/07/2023] Open
Abstract
Fatty acid nitroalkene derivatives (NO2-FA) activate Nrf2-regulated antioxidant gene expression and inhibit NF-κB-dependent cytokine expression. To better define NO2-FA structure-function relationships, a series of 22 new chemical entities (NCEs) containing an electrophilic nitroalkene functional group were synthesized and screened for both Nrf2- and NF-κB activities using luciferase-based assays. The structural variables were acyl chain length (11 to 24 carbons) and position of the electrophilic nitroalkene group. In luciferase-based reporter assays, Nrf2 was maximally activated by omega-12 nitroalkene fatty acids while TNFα stimulated NF-κB-inhibition was maximal for omega-5 nitroalkenes. The top pathway-modulating NO2-FAs were a) evaluated for an ability to activate Nrf2-dependent signaling and inhibit NF-κB-dependent inflammatory responses of RAW264.7 cells and b) compared to electrophilic compounds in clinical development. These findings revealed that 8/9-nitro-eicos-8-enoic acid (NCE-10) was collectively the most effective NCE and that both the α and ω acyl chain lengths influence nitroalkene activation of Nrf2 and inhibition of NF-κB signaling. This insight will guide development of more effective non-natural homologs of endogenously-detectable fatty acid nitroalkenes as anti-inflammatory and anti-fibrotic drug candidates.
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40
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Mathers AR, Carey CD, Killeen ME, Salvatore SR, Ferris LK, Freeman BA, Schopfer FJ, Falo LD. Topical electrophilic nitro-fatty acids potentiate cutaneous inflammation. Free Radic Biol Med 2018; 115:31-42. [PMID: 29132974 PMCID: PMC5767521 DOI: 10.1016/j.freeradbiomed.2017.11.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 11/07/2017] [Accepted: 11/09/2017] [Indexed: 11/18/2022]
Abstract
Endogenous electrophilic fatty acids mediate anti-inflammatory responses by modulating metabolic and inflammatory signal transduction and gene expression. Nitro-fatty acids and other electrophilic fatty acids may thus be useful for the prevention and treatment of immune-mediated diseases, including inflammatory skin disorders. In this regard, subcutaneous (SC) injections of nitro oleic acid (OA-NO2), an exemplary nitro-fatty acid, inhibit skin inflammation in a model of allergic contact dermatitis (ACD). Given the nitration of unsaturated fatty acids during metabolic and inflammatory processes and the growing use of fatty acids in topical formulations, we sought to further study the effect of nitro-fatty acids on cutaneous inflammation. To accomplish this, the effect of topically applied OA-NO2 on skin inflammation was evaluated using established murine models of contact hypersensitivity (CHS). In contrast to the effects of subcutaneously injected OA-NO2, topical OA-NO2 potentiated hapten-dependent inflammation inducing a sustained neutrophil-dependent inflammatory response characterized by psoriasiform histological features, increased angiogenesis, and an inflammatory infiltrate that included neutrophils, inflammatory monocytes, and γδ T cells. Consistent with these results, HPLC-MS/MS analysis of skin from psoriasis patients displayed a 56% increase in nitro-conjugated linoleic acid (CLA-NO2) levels in lesional skin compared to non-lesional skin. These results suggest that nitro-fatty acids in the skin microenvironment are products of cutaneous inflammatory responses and, in high local concentrations, may exacerbate inflammatory skin diseases.
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Affiliation(s)
- Alicia R Mathers
- Departments of Dermatology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA; Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA.
| | - Cara D Carey
- Departments of Dermatology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
| | - Meaghan E Killeen
- Departments of Dermatology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
| | - Sonia R Salvatore
- Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
| | - Laura K Ferris
- Departments of Dermatology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
| | - Bruce A Freeman
- Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
| | - Francisco J Schopfer
- Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
| | - Louis D Falo
- Departments of Dermatology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA; Bioengineering, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213. USA
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41
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Villacorta L, Minarrieta L, Salvatore SR, Khoo NK, Rom O, Gao Z, Berman RC, Jobbagy S, Li L, Woodcock SR, Chen YE, Freeman BA, Ferreira AM, Schopfer FJ, Vitturi DA. In situ generation, metabolism and immunomodulatory signaling actions of nitro-conjugated linoleic acid in a murine model of inflammation. Redox Biol 2018; 15:522-531. [PMID: 29413964 PMCID: PMC5881417 DOI: 10.1016/j.redox.2018.01.005] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/05/2018] [Accepted: 01/08/2018] [Indexed: 12/17/2022] Open
Abstract
Conjugated linoleic acid (CLA) is a prime substrate for intra-gastric nitration giving rise to the formation of nitro-conjugated linoleic acid (NO2-CLA). Herein, NO2-CLA generation is demonstrated within the context of acute inflammatory responses both in vitro and in vivo. Macrophage activation resulted in dose- and time-dependent CLA nitration and also in the production of secondary electrophilic and non-electrophilic derivatives. Both exogenous NO2-CLA as well as that generated in situ, attenuated NF-κB-dependent gene expression, decreased pro-inflammatory cytokine production and up-regulated Nrf2-regulated proteins. Importantly, both CLA nitration and the corresponding downstream anti-inflammatory actions of NO2-CLA were recapitulated in a mouse peritonitis model where NO2-CLA administration decreased pro-inflammatory cytokines and inhibited leukocyte recruitment. Taken together, our results demonstrate that the formation of NO2-CLA has the potential to function as an adaptive response capable of not only modulating inflammation amplitude but also protecting neighboring tissues via the expression of Nrf2-dependent genes.
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Affiliation(s)
- Luis Villacorta
- Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan Medical Center, Ann Arbor, MI, USA.
| | - Lucia Minarrieta
- Cátedra de Inmunología, Facultad de Química y Ciencias, Universidad de la República, Montevideo, Uruguay; Institute of Infection Immunology, TWINCORE, Hannover, Germany
| | - Sonia R Salvatore
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Nicholas K Khoo
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Oren Rom
- Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Zhen Gao
- Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Rebecca C Berman
- Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Soma Jobbagy
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Lihua Li
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Steven R Woodcock
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Y Eugene Chen
- Department of Cardiac Surgery, Frankel Cardiovascular Center, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ana M Ferreira
- Cátedra de Inmunología, Facultad de Química y Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Dario A Vitturi
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA.
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Hirsch RE, Sibmooh N, Fucharoen S, Friedman JM. HbE/β-Thalassemia and Oxidative Stress: The Key to Pathophysiological Mechanisms and Novel Therapeutics. Antioxid Redox Signal 2017; 26:794-813. [PMID: 27650096 PMCID: PMC5421591 DOI: 10.1089/ars.2016.6806] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/16/2016] [Indexed: 01/19/2023]
Abstract
SIGNIFICANCE Oxidative stress and generation of free radicals are fundamental in initiating pathophysiological mechanisms leading to an inflammatory cascade resulting in high rates of morbidity and death from many inherited point mutation-derived hemoglobinopathies. Hemoglobin (Hb)E is the most common point mutation worldwide. The βE-globin gene is found in greatest frequency in Southeast Asia, including Thailand, Malaysia, Indonesia, Vietnam, Cambodia, and Laos. With the wave of worldwide migration, it is entering the gene pool of diverse populations with greater consequences than expected. CRITICAL ISSUES While HbE by itself presents as a mild anemia and a single gene for β-thalassemia is not serious, it remains unexplained why HbE/β-thalassemia (HbE/β-thal) is a grave disease with high morbidity and mortality. Patients often exhibit defective physical development, severe chronic anemia, and often die of cardiovascular disease and severe infections. Recent Advances: This article presents an overview of HbE/β-thal disease with an emphasis on new findings pointing to pathophysiological mechanisms derived from and initiated by the dysfunctional property of HbE as a reduced nitrite reductase concomitant with excess α-chains exacerbating unstable HbE, leading to a combination of nitric oxide imbalance, oxidative stress, and proinflammatory events. FUTURE DIRECTIONS Additionally, we present new therapeutic strategies that are based on the emerging molecular-level understanding of the pathophysiology of this and other hemoglobinopathies. These strategies are designed to short-circuit the inflammatory cascade leading to devastating chronic morbidity and fatal consequences. Antioxid. Redox Signal. 26, 794-813.
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Affiliation(s)
- Rhoda Elison Hirsch
- Department of Medicine (Hematology), Albert Einstein College of Medicine, Bronx, New York
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York
| | - Nathawut Sibmooh
- Department of Pharmacology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Suthat Fucharoen
- Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, Nakornpathom, Thailand
| | - Joel M. Friedman
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, New York
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Waldman AJ, Ng TL, Wang P, Balskus EP. Heteroatom-Heteroatom Bond Formation in Natural Product Biosynthesis. Chem Rev 2017; 117:5784-5863. [PMID: 28375000 PMCID: PMC5534343 DOI: 10.1021/acs.chemrev.6b00621] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Natural products that contain functional groups with heteroatom-heteroatom linkages (X-X, where X = N, O, S, and P) are a small yet intriguing group of metabolites. The reactivity and diversity of these structural motifs has captured the interest of synthetic and biological chemists alike. Functional groups containing X-X bonds are found in all major classes of natural products and often impart significant biological activity. This review presents our current understanding of the biosynthetic logic and enzymatic chemistry involved in the construction of X-X bond containing functional groups within natural products. Elucidating and characterizing biosynthetic pathways that generate X-X bonds could both provide tools for biocatalysis and synthetic biology, as well as guide efforts to uncover new natural products containing these structural features.
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Affiliation(s)
- Abraham J. Waldman
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States
| | - Tai L. Ng
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States
| | - Peng Wang
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States
| | - Emily P. Balskus
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States
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Koch CD, Gladwin MT, Freeman BA, Lundberg JO, Weitzberg E, Morris A. Enterosalivary nitrate metabolism and the microbiome: Intersection of microbial metabolism, nitric oxide and diet in cardiac and pulmonary vascular health. Free Radic Biol Med 2017; 105:48-67. [PMID: 27989792 PMCID: PMC5401802 DOI: 10.1016/j.freeradbiomed.2016.12.015] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/18/2016] [Accepted: 12/12/2016] [Indexed: 02/07/2023]
Abstract
Recent insights into the bioactivation and signaling actions of inorganic, dietary nitrate and nitrite now suggest a critical role for the microbiome in the development of cardiac and pulmonary vascular diseases. Once thought to be the inert, end-products of endothelial-derived nitric oxide (NO) heme-oxidation, nitrate and nitrite are now considered major sources of exogenous NO that exhibit enhanced vasoactive signaling activity under conditions of hypoxia and stress. The bioavailability of nitrate and nitrite depend on the enzymatic reduction of nitrate to nitrite by a unique set of bacterial nitrate reductase enzymes possessed by specific bacterial populations in the mammalian mouth and gut. The pathogenesis of pulmonary hypertension (PH), obesity, hypertension and CVD are linked to defects in NO signaling, suggesting a role for commensal oral bacteria to shape the development of PH through the formation of nitrite, NO and other bioactive nitrogen oxides. Oral supplementation with inorganic nitrate or nitrate-containing foods exert pleiotropic, beneficial vascular effects in the setting of inflammation, endothelial dysfunction, ischemia-reperfusion injury and in pre-clinical models of PH, while traditional high-nitrate dietary patterns are associated with beneficial outcomes in hypertension, obesity and CVD. These observations highlight the potential of the microbiome in the development of novel nitrate- and nitrite-based therapeutics for PH, CVD and their risk factors.
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Affiliation(s)
- Carl D Koch
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA 15261, USA.
| | - Mark T Gladwin
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA 15261, USA; Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA 15261, USA
| | - Bruce A Freeman
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA 15261, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Jon O Lundberg
- Department of Physiology and Pharmacology, Karolinska Institutet, S-17177 Stockholm, Sweden
| | - Eddie Weitzberg
- Department of Physiology and Pharmacology, Karolinska Institutet, S-17177 Stockholm, Sweden
| | - Alison Morris
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA 15261, USA; Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA 15261, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Department of Physiology and Pharmacology, Karolinska Institutet, S-17177 Stockholm, Sweden
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45
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Mata-Pérez C, Sánchez-Calvo B, Padilla MN, Begara-Morales JC, Valderrama R, Corpas FJ, Barroso JB. Nitro-fatty acids in plant signaling: New key mediators of nitric oxide metabolism. Redox Biol 2017; 11:554-561. [PMID: 28104576 PMCID: PMC5241575 DOI: 10.1016/j.redox.2017.01.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 12/30/2016] [Accepted: 01/03/2017] [Indexed: 01/21/2023] Open
Abstract
Recent studies in animal systems have shown that NO can interact with fatty acids to generate nitro-fatty acids (NO2-FAs). They are the product of the reaction between reactive nitrogen species and unsaturated fatty acids, and are considered novel mediators of cell signaling based mainly on a proven anti-inflammatory response. Although these signaling mediators have been described widely in animal systems, NO2-FAs have scarcely been studied in plants. Preliminary data have revealed the endogenous presence of free and protein-adducted NO2-FAs in extra-virgin olive oil (EVOO), which appear to be contributing to the cardiovascular benefits associated with the Mediterranean diet. Importantly, new findings have displayed the endogenous occurrence of nitro-linolenic acid (NO2-Ln) in the model plant Arabidopsis thaliana and the modulation of NO2-Ln levels throughout this plant's development. Furthermore, a transcriptomic analysis by RNA-seq technology established a clear signaling role for this molecule, demonstrating that NO2-Ln was involved in plant-defense response against different abiotic-stress conditions, mainly by inducing the chaperone network and supporting a conserved mechanism of action in both animal and plant defense processes. Thus, NO2-Ln levels significantly rose under several abiotic-stress conditions, highlighting the strong signaling role of these molecules in the plant-protection mechanism. Finally, the potential of NO2-Ln as a NO donor has recently been described both in vitro and in vivo. Jointly, this ability gives NO2-Ln the potential to act as a signaling molecule by the direct release of NO, due to its capacity to induce different changes mediated by NO or NO-related molecules such as nitration and S-nitrosylation, or by the electrophilic capacity of these molecules through a nitroalkylation mechanism. Here, we describe the current state of the art regarding the advances performed in the field of NO2-FAs in plants and their implication in plant physiology.
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Affiliation(s)
- Capilla Mata-Pérez
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, Campus Universitario "Las Lagunillas" s/n, University of Jaén, E-23071 Jaén, Spain
| | - Beatriz Sánchez-Calvo
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, Campus Universitario "Las Lagunillas" s/n, University of Jaén, E-23071 Jaén, Spain
| | - María N Padilla
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, Campus Universitario "Las Lagunillas" s/n, University of Jaén, E-23071 Jaén, Spain
| | - Juan C Begara-Morales
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, Campus Universitario "Las Lagunillas" s/n, University of Jaén, E-23071 Jaén, Spain
| | - Raquel Valderrama
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, Campus Universitario "Las Lagunillas" s/n, University of Jaén, E-23071 Jaén, Spain
| | - Francisco J Corpas
- Group of Antioxidants, Free Radicals and Nitric Oxide in Biotechnology, Food and Agriculture, Department of Biochemistry, Cellular and Molecular Biology of Plants, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, Granada, Spain
| | - Juan B Barroso
- Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Center for Advanced Studies in Olive Grove and Olive Oils, Faculty of Experimental Sciences, Campus Universitario "Las Lagunillas" s/n, University of Jaén, E-23071 Jaén, Spain.
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46
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Evaluation of 10-Nitro Oleic Acid Bio-Elimination in Rats and Humans. Sci Rep 2017; 7:39900. [PMID: 28054588 PMCID: PMC5215368 DOI: 10.1038/srep39900] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/29/2016] [Indexed: 12/12/2022] Open
Abstract
Nitrated fatty acids are endogenously present in human and animal tissues, as well as in plant-derived oils. In particular, 10-nitro oleic acid (10-NO2-OA) potently induces Nrf2-dependent antioxidant gene expression and inhibits TLR4/NF-κB signaling, thus promoting an overall cyto-protective and anti-inflammatory response. 10-NO2-OA has been extensively tested in animal models and is currently undergoing clinical evaluation in humans. Bio-elimination pathways for 10-NO2-OA were evaluated in rats (30 mg/kg·day) and in humans (0.34 mg/kg) using samples obtained from a double-blind, dose-rising clinical trial. Quantitative radiochromatographic/MS analysis indicated that the renal and fecal pathways are the main routes for 10-NO2-OA excretion in rats, and allowed the identification of 4-nitro-octanedioic acid (NO2-8:0-diCOOH) as the most abundant metabolite in rat urine. In addition, high resolution LC-MS/MS analysis revealed the presence of a novel series of urinary metabolites including ω-carboxylation and β-oxidation products, as well as N-acetylcysteine, taurine and sulfo-conjugates in both rats and humans. Overall, the findings reported herein not only provide valuable tools for the experimental evaluation of 10-NO2-OA levels in vivo, but importantly they also set the basis for monitoring its metabolism during potential clinical interventions in humans.
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47
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Electrophilic Nitro-Fatty Acids: Nitric Oxide and Nitrite-Derived Metabolic and Inflammatory Signaling Mediators. Nitric Oxide 2017. [DOI: 10.1016/b978-0-12-804273-1.00016-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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48
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Turell L, Vitturi DA, Coitiño EL, Lebrato L, Möller MN, Sagasti C, Salvatore SR, Woodcock SR, Alvarez B, Schopfer FJ. The Chemical Basis of Thiol Addition to Nitro-conjugated Linoleic Acid, a Protective Cell-signaling Lipid. J Biol Chem 2016; 292:1145-1159. [PMID: 27923813 DOI: 10.1074/jbc.m116.756288] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 11/23/2016] [Indexed: 11/06/2022] Open
Abstract
Nitroalkene fatty acids are formed in vivo and exert protective and anti-inflammatory effects via reversible Michael addition to thiol-containing proteins in key signaling pathways. Nitro-conjugated linoleic acid (NO2-CLA) is preferentially formed, constitutes the most abundant nitrated fatty acid in humans, and contains two carbons that could potentially react with thiols, modulating signaling actions and levels. In this work, we examined the reactions of NO2-CLA with low molecular weight thiols (glutathione, cysteine, homocysteine, cysteinylglycine, and β-mercaptoethanol) and human serum albumin. Reactions followed reversible biphasic kinetics, consistent with the presence of two electrophilic centers in NO2-CLA located on the β- and δ-carbons with respect to the nitro group. The differential reactivity was confirmed by computational modeling of the electronic structure. The rates (kon and koff) and equilibrium constants for both reactions were determined for different thiols. LC-UV-Visible and LC-MS analyses showed that the fast reaction corresponds to β-adduct formation (the kinetic product), while the slow reaction corresponds to the formation of the δ-adduct (the thermodynamic product). The pH dependence of the rate constants, the correlation between intrinsic reactivity and thiol pKa, and the absence of deuterium solvent kinetic isotope effects suggested stepwise mechanisms with thiolate attack on NO2-CLA as rate-controlling step. Computational modeling supported the mechanism and revealed additional features of the transition states, anionic intermediates, and final neutral products. Importantly, the detection of cysteine-δ-adducts in human urine provided evidence for the biological relevance of this reaction. Finally, human serum albumin was found to bind NO2-CLA both non-covalently and to form covalent adducts at Cys-34, suggesting potential modes for systemic distribution. These results provide new insights into the chemical basis of NO2-CLA signaling actions.
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Affiliation(s)
- Lucía Turell
- From the Laboratorios de Enzimología.,Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo 11400, Uruguay and
| | - Darío A Vitturi
- the Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | | | - Lourdes Lebrato
- From the Laboratorios de Enzimología.,Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo 11400, Uruguay and
| | - Matías N Möller
- Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo 11400, Uruguay and.,Fisicoquímica Biológica, Instituto de Química Biológica, Facultad de Ciencias, and
| | | | - Sonia R Salvatore
- the Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Steven R Woodcock
- the Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Beatriz Alvarez
- From the Laboratorios de Enzimología, .,Center for Free Radical and Biomedical Research, Universidad de la República, Montevideo 11400, Uruguay and
| | - Francisco J Schopfer
- the Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
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49
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Villacorta L, Gao Z, Schopfer FJ, Freeman BA, Chen YE. Nitro-fatty acids in cardiovascular regulation and diseases: characteristics and molecular mechanisms. Front Biosci (Landmark Ed) 2016; 21:873-89. [PMID: 26709810 DOI: 10.2741/4425] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Electrophilic nitro-fatty acids (NO2-FAs) are endogenously formed by redox reactions of nitric oxide ((.)NO)- and nitrite ((.)NO2)- derived nitrogen dioxide with unsaturated fatty acids. Nitration preferentially occurs on polyunsaturated fatty acids with conjugated dienes under physiological or pathophysiological conditions such as during digestion, metabolism and as adaptive inflammatory processes. Nitro-fatty acids are present in free and esterified forms achieving broad biodistribution in humans and experimental models. Structural, functional and biological characterization of NO2-FAs has revealed clinically relevant protection from inflammatory injury in a number of cardiovascular, renal and metabolic experimental models. NO2-FAs are engaged in posttranslational modifications (PTMs) of a selective redox sensitive pool of proteins and regulate key adaptive signaling pathways involved in cellular homeostasis and inflammatory response. Here, we review and update the biosynthesis, metabolism and signaling actions of NO2-FAs, highlighting their diverse protective roles relevant to the cardiovascular system.
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Affiliation(s)
- Luis Villacorta
- Cardiovascular Center, Department of Internal Medicine, University of Michigan, North Campus Research Complex 26, 2800 Plymouth Road, Ann Arbor, MI 48109,,
| | - Zhen Gao
- Cardiovascular Center, Department of Internal Medicine, University of Michigan, North Campus Research Complex 26, 2800 Plymouth Road, Ann Arbor, MI 48109
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, E1343 Thomas E. Starzl Biomedical Science Tower, 200 Lothrop Street, Pittsburgh, PA 15213
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, E1343 Thomas E. Starzl Biomedical Science Tower, 200 Lothrop Street, Pittsburgh, PA 15213
| | - Y Eugene Chen
- Cardiovascular Center, Department of Internal Medicine, University of Michigan, North Campus Research Complex 26, 2800 Plymouth Road, Ann Arbor, MI 48109
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50
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Delmastro-Greenwood M, Hughan KS, Vitturi DA, Salvatore SR, Grimes G, Potti G, Shiva S, Schopfer FJ, Gladwin MT, Freeman BA, Gelhaus Wendell S. Nitrite and nitrate-dependent generation of anti-inflammatory fatty acid nitroalkenes. Free Radic Biol Med 2015; 89:333-41. [PMID: 26385079 PMCID: PMC4684780 DOI: 10.1016/j.freeradbiomed.2015.07.149] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 07/23/2015] [Accepted: 07/24/2015] [Indexed: 10/23/2022]
Abstract
A gap in our understanding of the beneficial systemic responses to dietary constituents nitrate (NO3(-)), nitrite (NO2(-)) and conjugated linoleic acid (cLA) is the identification of the downstream metabolites that mediate their actions. To examine these reactions in a clinical context, investigational drug preparations of (15)N-labeled NO3(-) and NO2(-) were orally administered to healthy humans with and without cLA. Mass spectrometry analysis of plasma and urine indicated that the nitrating species nitrogen dioxide was formed and reacted with the olefinic carbons of unsaturated fatty acids to yield the electrophilic fatty acid, nitro-cLA (NO2-cLA). These species mediate the post-translational modification (PTM) of proteins via reversible Michael addition with nucleophilic amino acids. The PTM of critical target proteins by electrophilic lipids has been described as a sensing mechanism that regulates adaptive cellular responses, but little is known about the endogenous generation of fatty acid nitroalkenes and their metabolites. We report that healthy humans consuming (15)N-labeled NO3(-) or NO2(-), with and without cLA supplementation, produce (15)NO2-cLA and corresponding metabolites that are detected in plasma and urine. These data support that the dietary constituents NO3(-), NO2(-) and cLA promote the further generation of secondary electrophilic lipid products that are absorbed into the circulation at concentrations sufficient to exert systemic effects before being catabolized or excreted.
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Affiliation(s)
| | - Kara S Hughan
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA, 15261, USA
| | - Dario A Vitturi
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Sonia R Salvatore
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - George Grimes
- Pharmaceutical Development Section, Pharmacy Department, Clinical Center, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Gopal Potti
- Pharmaceutical Development Section, Pharmacy Department, Clinical Center, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Sruti Shiva
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA, 15261, USA
| | - Francisco J Schopfer
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA, 15261, USA
| | - Mark T Gladwin
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA, 15261, USA
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA, 15261, USA.
| | - Stacy Gelhaus Wendell
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh PA, 15261, USA.
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