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Trindade-da-Silva CA, Yang J, Fonseca F, Pham H, Napimoga MH, Abdalla HB, Aver G, De Oliveira MJA, Hammock BD, Clemente-Napimoga JT. Eicosanoid profiles in an arthritis model: Effects of a soluble epoxide hydrolase inhibitor. Biochim Biophys Acta Mol Cell Biol Lipids 2024; 1869:159432. [PMID: 37984607 PMCID: PMC10842726 DOI: 10.1016/j.bbalip.2023.159432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 11/01/2023] [Accepted: 11/15/2023] [Indexed: 11/22/2023]
Abstract
Rheumatoid arthritis is a common systemic inflammatory autoimmune disease characterized by damage to joints, inflammation and pain. It is driven by an increase of inflammatory cytokines and lipids mediators such as prostaglandins. Epoxides of polyunsaturated fatty acids (PUFAs) are lipid chemical mediators in a group of regulatory compounds termed eicosanoids. These epoxy fatty acids (EpFA) have resolutive functions but are rapidly metabolized by the soluble epoxide hydrolase enzyme (sEH) into the corresponding diols. The pharmacological inhibition of sEH stabilizes EpFA from hydrolysis, improving their half-lives and biological effects. These anti-inflammatory EpFA, are analgesic in neuropathic and inflammatory pain conditions. Nonetheless, inhibition of sEH on arthritis and the resulting effects on eicosanoids profiles are little explored despite the physiological importance. In this study, we investigated the effect of sEH inhibition on collagen-induced arthritis (CIA) and its impact on the plasma eicosanoid profile. We measured the eicosanoid metabolites by LC-MS/MS-based lipidomic analysis. The treatment with a sEH inhibitor significantly modulated 11 out of 69 eicosanoids, including increased epoxides 12(13)-EpODE, 12(13)-EpOME, 13-oxo-ODE, 15-HEPE, 20-COOH-LTB4 and decreases several diols 15,6-DiHODE, 12,13-DiHOME, 14,15-DiHETrE, 5,6-DiHETrE and 16,17-DiHDPE. Overall the inhibition of sEH in the rheumatoid arthritis model enhanced epoxides generally considered anti-inflammatory or resolutive mediators and decreased several diols with inflammatory features. These findings support the hypothesis that inhibiting the sEH increases systemic EpFA levels, advancing the understanding of the impact of these lipid mediators as therapeutical targets.
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Affiliation(s)
- Carlos Antonio Trindade-da-Silva
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil; Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Jun Yang
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA; EicOsis LLC, Davis, CA, USA
| | - Flavia Fonseca
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Hoang Pham
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Marcelo Henrique Napimoga
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Henrique Ballassini Abdalla
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Geanpaolo Aver
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Márcio José Alves De Oliveira
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Bruce D Hammock
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA; EicOsis LLC, Davis, CA, USA
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Abdalla HB, Puhl L, Rivas CA, Wu YC, Rojas P, Trindade-da-Silva CA, Hammock BD, Maddipati KR, Soares MQS, Clemente-Napimoga JT, Kantarci A, Napimoga MH, Van Dyke TE. Modulating the sEH/EETs Axis Restrains Specialized Proresolving Mediator Impairment and Regulates T Cell Imbalance in Experimental Periodontitis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2024; 212:433-445. [PMID: 38117781 PMCID: PMC10866374 DOI: 10.4049/jimmunol.2300650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 11/26/2023] [Indexed: 12/22/2023]
Abstract
Epoxyeicosatrienoic acids (EETs) and other epoxy fatty acids are short-acting lipids involved in resolution of inflammation. Their short half-life, due to its metabolism by soluble epoxide hydrolase (sEH), limits their effects. Specialized proresolving mediators (SPMs) are endogenous regulatory lipids insufficiently synthesized in uncontrolled and chronic inflammation. Using an experimental periodontitis model, we pharmacologically inhibited sEH, examining its impact on T cell activation and systemic SPM production. In humans, we analyzed sEH in the gingival tissue of periodontitis patients. Mice were treated with sEH inhibitor (sEHi) and/or EETs before ligature placement and treated for 14 d. Bone parameters were assessed by microcomputed tomography and methylene blue staining. Blood plasma metabololipidomics were carried out to quantify SPM levels. We also determined T cell activation by reverse transcription-quantitative PCR and flow cytometry in cervical lymph nodes. Human gingival samples were collected to analyze sEH using ELISA and electrophoresis. Data reveal that pharmacological sEHi abrogated bone resorption and preserved bone architecture. Metabololipidomics revealed that sEHi enhances lipoxin A4, lipoxin B4, resolvin E2, and resolvin D6. An increased percentage of regulatory T cells over Th17 was noted in sEHi-treated mice. Lastly, inflamed human gingival tissues presented higher levels and expression of sEH than did healthy gingivae, being positively correlated with periodontitis severity. Our findings indicate that sEHi preserves bone architecture and stimulates SPM production, associated with regulatory actions on T cells favoring resolution of inflammation. Because sEH is enhanced in human gingivae from patients with periodontitis and connected with disease severity, inhibition may prove to be an attractive target for managing osteolytic inflammatory diseases.
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Affiliation(s)
- Henrique B. Abdalla
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA
- Faculdade São Leopoldo Mandic, Campinas, SP, Brazil
| | - Luciano Puhl
- Faculdade São Leopoldo Mandic, Campinas, SP, Brazil
| | - Carla Alvarez Rivas
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA
- Harvard School of Dental Medicine, Boston, MA, USA
| | - Yu-Chiao Wu
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA
- Harvard School of Dental Medicine, Boston, MA, USA
| | - Paola Rojas
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA
| | | | - Bruce D. Hammock
- Department of Entomology and UCD Comprehensive Cancer Center, University of California, Davis, CA, USA
| | | | | | | | - Alpdogan Kantarci
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA
| | | | - Thomas E. Van Dyke
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA
- Department of Oral Medicine, Infection, and Immunity, Faculty of Medicine, Harvard University, Boston, MA, USA
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Moreira ALG, Silva GA, Silva PHF, Salvador SL, Vicente RM, Ferreira GC, Tanus-Santos JE, Mayer MPA, Ishikawa KH, de Souza SLS, Furlaneto FAC, Messora MR. Bifidobacterium animalis subspecies lactis HN019 can reduce the sequelae of experimental periodontitis in rats modulating intestinal parameters, expression of lipogenic genes, and levels of hepatic steatosis. J Periodontal Res 2023; 58:1006-1019. [PMID: 37482954 DOI: 10.1111/jre.13163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 05/15/2023] [Accepted: 07/07/2023] [Indexed: 07/25/2023]
Abstract
OBJECTIVE To determine whether Bifidobacterium animalis subspecies lactis HN019 (B. lactis HN019) can reduce the sequelae of experimental periodontitis (EP) in rats modulating systemic parameters. BACKGROUND This study evaluated the effects of probiotic therapy (PROB) in the prevention of local and systemic damage resulting from EP. METHODS Forty-eight rats were allocated into four groups: C (control), PROB, EP, and EP-PROB. PROB (1 × 1010 CFU/mL) administration lasted 8 weeks and PE was induced on the 7th week by placing ligature on the animals' lower first molars. All animals were euthanized in the 9th week of the experiment. Biomolecular analyses, RT-PCR, and histomorphometric analyses were performed. The data obtained were analyzed statistically (ANOVA, Tukey, p < .05). RESULTS The EP group had higher dyslipidemia when compared to the C group, as well as higher levels of insulin resistance, proteinuria levels, percentages of systolic blood pressure, percentage of fatty hepatocytes in the liver, and expression of adipokines was up-regulated (LEPR, NAMPT, and FABP4). All these parameters (except insulin resistance, systolic blood pressure, LEPR and FABP4 gene expression) were reduced in the EP-PROB group when compared to the EP group. The EP group had lower villus height and crypt depth, as well as a greater reduction in Bacteroidetes and a greater increase in Firmicutes when compared to the EP-PROB group. Greater alveolar bone loss was observed in the EP group when compared to the EP-PROB group. CONCLUSION Bifidobacterium lactis HN019 can reduce the sequelae of EP in rats modulating intestinal parameters, attenuating expression of lipogenic genes and hepatic steatosis.
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Affiliation(s)
- André L G Moreira
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Giselle A Silva
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Pedro H F Silva
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Sérgio L Salvador
- Department of Clinical Analyses, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Raphael M Vicente
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Graziele C Ferreira
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Jose E Tanus-Santos
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Marcia P A Mayer
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Karin H Ishikawa
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Sérgio Luís Scombatti de Souza
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Flávia A C Furlaneto
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
| | - Michel R Messora
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo - USP, Ribeirão Preto, São Paulo, Brazil
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Tarkany Basting R, Henrique Napimoga M, Antônio Trindade Silva C, Ballassini Abdalla H, Campos Durso B, Henrique Barboza Martins L, de Abreu Cavalcanti H, Hammock BD, Trindade Clemente-Napimoga J. Soluble epoxide hydrolase inhibitor blockage microglial cell activation in subnucleus caudalis in a persistent model of arthritis. Int Immunopharmacol 2023; 120:110320. [PMID: 37230034 PMCID: PMC10631565 DOI: 10.1016/j.intimp.2023.110320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/30/2023] [Accepted: 05/08/2023] [Indexed: 05/27/2023]
Abstract
Rheumatoid arthritis (RA) is a chronic condition characterized by pain and infiltration of immune cells into the joint. Immune cells can be activated, producing inflammatory cytokines, leading to continuously degenerative and inflammatory reactions and the temporomandibular joint (TMJ) can be affected by RA. In this scenario, novel targets are needed to increase treatment efficacy with minimized side effects. The epoxy-eicosatrienoic acids (EETs), are endogenous signaling molecules, playing important roles in diminishing inflammation and pain but are promptly metabolized by soluble epoxide hydrolase (sEH), generating less-bioactive acids.Therefore, sEH inhibitors is an interest therapeutic target to enhance the beneficial effect of natural EETs. TPPU is a potent sEH inhibitor that is capable of dampening EETs hydrolysis. Thus, we aimed to assess the impact of pharmacological sEH inhibition on a persistent model of albumin-induced arthritis in the TMJ, in two scenarios: first, as post-treatment, in an installed arthritic condition, and second, the protective role, in preventing the development of an arthritic condition. In addition, we investigate the influence of sEH inhibition on microglia cell activation in the trigeminal subnucleus caudalis (TSC) and in vitro experiments. Finally, we examined the astrocyte phenotype. Oral administration of TPPU, acts in multiple pathways, in a protective and reparative post-treatment, ameliorating the preservation of the TMJ morphology, reducing the hypernociception, with an immunosuppressive action reducing neutrophil and lymphocytes and pro-inflammatory cytokines in the TMJ of rats. In TSC, TPPU reduces the cytokine storm and attenuates the microglia activated P2X7/Cathepsin S/Fractalkine pathway and reduces the astrocyte activation and glutamate levels. Collectively, our findings revealed that sEH inhibition mitigates hypersensitive nociception through the regulation of microglia activation and astrocyte modulation, demonstrating the potential use of sEH inhibitors as immunoresolvents in the treatment of autoimmune disorders.
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Affiliation(s)
- Rosanna Tarkany Basting
- São Leopoldo Mandic Institute and Research Center, Laboratory of Neuroimmune Interface of Pain Research, United States
| | - Marcelo Henrique Napimoga
- São Leopoldo Mandic Institute and Research Center, Laboratory of Neuroimmune Interface of Pain Research, United States
| | - Carlos Antônio Trindade Silva
- São Leopoldo Mandic Institute and Research Center, Laboratory of Neuroimmune Interface of Pain Research, United States
| | - Henrique Ballassini Abdalla
- São Leopoldo Mandic Institute and Research Center, Laboratory of Neuroimmune Interface of Pain Research, United States
| | - Braz Campos Durso
- São Leopoldo Mandic Institute and Research Center, Laboratory of Neuroimmune Interface of Pain Research, United States
| | | | - Herbert de Abreu Cavalcanti
- São Leopoldo Mandic Institute and Research Center, Laboratory of Neuroimmune Interface of Pain Research, United States
| | - Bruce D Hammock
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, United States of America; EicOsis LLC, Davis, CA, United States of America
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Abdalla HB, Alvarez C, Wu YC, Rojas P, Hammock BD, Maddipati KR, Trindade-da-Silva CA, Soares MQS, Clemente-Napimoga JT, Kantarci A, Napimoga MH, Van Dyke TE. Soluble epoxide hydrolase inhibition enhances production of specialized pro-resolving lipid mediator and promotes macrophage plasticity. Br J Pharmacol 2023; 180:1597-1615. [PMID: 36508312 PMCID: PMC10175184 DOI: 10.1111/bph.16009] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 08/25/2022] [Accepted: 10/10/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND PURPOSE Epoxyeicosatrienoic acids (EETs) and other epoxy fatty acids (EpFA) are lipid mediators that are rapidly inactivated by soluble epoxide hydrolase (sEH). Uncontrolled and chronic inflammatory disorders fail to sufficiently activate endogenous regulatory pathways, including the production of specialized pro-resolving mediators (SPMs). Here, we addressed the relationship between SPMs and the EET/sEH axis and explored the effects of sEH inhibition on resolving macrophage phenotype. EXPERIMENTAL APPROACH Mice were treated with a sEH inhibitor, EETs, or sEH inhibitor + EETs (combination) before ligature placement to induce experimental periodontitis. Using RT-qPCR, gingival samples were used to examine SPM receptors and osteolytic and inflammatory biomarkers. Maxillary alveolar bone loss was quantified by micro-CT and methylene blue staining. SPM levels were analysed by salivary metabolo-lipidomics. Gingival macrophage phenotype plasticity was determined by RT-qPCR and flow cytometry. Effects of sEH inhibition on macrophage polarization and SPM production were assessed with bone marrow-derived macrophages (BMDMs). KEY RESULTS Pharmacological inhibition of sEH suppressed bone resorption and the inflammatory cytokine storm in experimental periodontitis. Lipidomic analysis revealed that sEH inhibition augmented levels of LXA4, RvE1, RvE2, and 4-HDoHE, concomitant with up-regulation of LTB4R1, CMKLR1/ChemR23, and ALX/FPR2 SPM receptors. Notably, there is an impact on gingival macrophage plasticity was affected suggesting an inflammation resolving phenotype with sEH inhibition. In BMDMs, sEH inhibition reduced inflammatory macrophage activation, and resolving macrophages were triggered to produce SPMs. CONCLUSION AND IMPLICATIONS Pharmacological sEH inhibition increased SPM synthesis associated with resolving macrophages, suggesting a potential target to control osteolytic inflammatory disorders.
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Affiliation(s)
- Henrique B Abdalla
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, Massachusetts, USA
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, Brazil
| | - Carla Alvarez
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, Massachusetts, USA
| | - Yu-Chiao Wu
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, Massachusetts, USA
- Harvard School of Dental Medicine, Boston, Massachusetts, USA
| | - Paola Rojas
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, Massachusetts, USA
| | - Bruce D Hammock
- Department of Entomology and UCD Comprehensive Cancer Center, University of California, Davis, California, USA
| | | | - Carlos Antonio Trindade-da-Silva
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, Brazil
| | - Mariana Q S Soares
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, Brazil
| | - Juliana T Clemente-Napimoga
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, Brazil
| | - Alpdogan Kantarci
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, Massachusetts, USA
| | - Marcelo H Napimoga
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisa São Leopoldo Mandic, Campinas, Brazil
| | - Thomas E Van Dyke
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, Massachusetts, USA
- Department of Oral Medicine, Infection, and Immunity, Faculty of Medicine, Harvard University, Boston, Massachusetts, USA
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Wang W, Wagner KM, Wang Y, Singh N, Yang J, He Q, Morisseau C, Hammock BD. Soluble Epoxide Hydrolase Contributes to Cell Senescence and ER Stress in Aging Mice Colon. Int J Mol Sci 2023; 24:4570. [PMID: 36901999 PMCID: PMC10003560 DOI: 10.3390/ijms24054570] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/23/2023] [Accepted: 02/24/2023] [Indexed: 03/03/2023] Open
Abstract
Aging, which is characterized by enhanced cell senescence and functional decline of tissues, is a major risk factor for many chronic diseases. Accumulating evidence shows that age-related dysfunction in the colon leads to disorders in multiple organs and systemic inflammation. However, the detailed pathological mechanisms and endogenous regulators underlying colon aging are still largely unknown. Here, we report that the expression and activity of the soluble epoxide hydrolase (sEH) enzyme are increased in the colon of aged mice. Importantly, genetic knockout of sEH attenuated the age-related upregulation of senescent markers p21, p16, Tp53, and β-galactosidase in the colon. Moreover, sEH deficiency alleviated aging-associated endoplasmic reticulum (ER) stress in the colon by reducing both the upstream regulators Perk and Ire1 as well as the downstream pro-apoptotic effectors Chop and Gadd34. Furthermore, treatment with sEH-derived linoleic acid metabolites, dihydroxy-octadecenoic acids (DiHOMEs), decreased cell viability and increased ER stress in human colon CCD-18Co cells in vitro. Together, these results support that the sEH is a key regulator of the aging colon, which highlights its potential application as a therapeutic target for reducing or treating age-related diseases in the colon.
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Affiliation(s)
- Weicang Wang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Karen M. Wagner
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Yuxin Wang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Nalin Singh
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Jun Yang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Qiyi He
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Christophe Morisseau
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Bruce D. Hammock
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, One Shields Avenue, Davis, CA 95616, USA
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7
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Abdalla HB, Van Dyke TE. The impact of the soluble epoxide hydrolase cascade on periodontal tissues. FRONTIERS IN DENTAL MEDICINE 2023. [DOI: 10.3389/fdmed.2023.1129371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Periodontitis is a chronic inflammatory disease with complex pathogenesis. Uncontrolled inflammation is driven by the immune system in response to accumulation of oral biofilm that leads to alveolar bone loss, bleeding, increased periodontal probing depth with loss of attachment of the connective tissues to the tooth, and ultimately, tooth loss. Soluble epoxide hydrolase (sEH) is an enzyme that converts epoxy fatty acids (EpFAs) produced by cytochrome P450 (CYP450) to an inactive diol. It has been shown that EpFAs display important features to counteract an exaggerated inflammatory process. Based upon this observation, inhibitors of sEH have been developed and are being proposed as a strategy to regulate proinflammatory inflammatory lipid mediator production and the chronicity of inflammation. This mini review focuses on the impact of sEH inhibition on periodontal tissues focusing on the mechanisms involved. The interaction between Specialized Pro-Resolving Mediators and sEH inhibition emerges as a significant mechanism of action of sEH inhibitors that was not formerly appreciated and provides new insight into the role SPMs may play in prevention and treatment of periodontitis.
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Wang W, Wang Y, Yang J, Wagner KM, Hwang SH, Cheng J, Singh N, Edwards P, Morisseau C, Zhang G, Panigrahy D, Hammock BD. Aflatoxin B 1 exposure disrupts the intestinal immune function via a soluble epoxide hydrolase-mediated manner. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 249:114417. [PMID: 36525946 PMCID: PMC9879385 DOI: 10.1016/j.ecoenv.2022.114417] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 11/22/2022] [Accepted: 12/09/2022] [Indexed: 05/05/2023]
Abstract
Aflatoxin B1 (AFB1) contamination in food and feed leads to severe global health problems. Acting as the frontier immunological barrier, the intestinal mucosa is constantly challenged by exposure to foodborne toxins such as AFB1 via contaminated diets, but the detailed toxic mechanism and endogenous regulators of AFB1 toxicity are still unclear. Here, we showed that AFB1 disrupted intestinal immune function by suppressing macrophages, especially M2 macrophages, and antimicrobial peptide-secreting Paneth cells. Using an oxylipinomics approach, we identified that AFB1 immunotoxicity is associated with decreased epoxy fatty acids, notably epoxyeicosatrienoic acids, and increased soluble epoxide hydrolase (sEH) levels in the intestine. Furthermore, sEH deficiency or inhibition rescued the AFB1-compromised intestinal immunity by restoring M2 macrophages as well as Paneth cells and their-derived lysozyme and α-defensin-3 in mice. Altogether, our study demonstrates that AFB1 exposure impairs intestinal immunity, at least in part, in a sEH-mediated way. Moreover, the present study supports the potential application of pharmacological intervention by inhibiting the sEH enzyme in alleviating intestinal immunotoxicity and associated complications caused by AFB1 global contamination.
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Affiliation(s)
- Weicang Wang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Yuxin Wang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Jun Yang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Karen M Wagner
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Sung Hee Hwang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Jeff Cheng
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Nalin Singh
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Patricia Edwards
- Center for Health and the Environment, University of California Davis, Davis, CA, USA
| | - Christophe Morisseau
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Guodong Zhang
- Department of Food Science and Technology, National University of Singapore, Singapore
| | - Dipak Panigrahy
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Center for Vascular Biology Research, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Bruce D Hammock
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA.
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9
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Jiang M, Li Z, Zhu G. The role of endoplasmic reticulum stress in the pathophysiology of periodontal disease. J Periodontal Res 2022; 57:915-932. [PMID: 35818935 DOI: 10.1111/jre.13031] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 05/22/2022] [Accepted: 06/23/2022] [Indexed: 12/14/2022]
Abstract
The endoplasmic reticulum (ER) is a principal organelle for folding, post-translational modifications and transport of secretory, luminal, and membrane proteins. ER stress is a condition induced by the accumulation of unfolded or misfolded proteins owing to a variety of physiological and pathological phenomena. To overcome the deleterious effects of ER stress, unfolded protein response (UPR) is initiated to translocate and remove the misfolded and accumulated proteins. Plenty of evidence shows the correlation between ER stress/UPR and the pathology of inflammatory disease. Periodontal disease is a chronic inflammatory disease characterized by the irreversible destruction of periodontal tissues, which associates with the onset and progress of several systemic diseases. Periodontopathic bacterium and pro-inflammatory mediators play a pivotal role in the progress of periodontal disease. Besides, cigarette smoke has long been associated with periodontal disease. As an inflammatory disorder of the periodontium, periodontal disease is highly related to ER stress. In this review, we provide an overview of the pathophysiological effect of ER stress on periodontal disease through five aspects as follow: ER stress and periodontal tissue remodeling, including both soft tissue and hard tissue; ER stress and the inflammation; ER stress and systematic effect during the periodontal disease; last but not least, ER stress and the autophagic apoptosis in cells.
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Affiliation(s)
- Ming Jiang
- Department of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zhuoneng Li
- Centers for Disease Control and Prevention of Wuhan, Wuhan, Hubei, China
| | - Guangxun Zhu
- Department of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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10
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Trindade da Silva CA, Clemente-Napimoga JT, Abdalla HB, Basting RT, Napimoga MH. Peroxisome proliferator-activated receptor-gamma (PPARγ) and its immunomodulation function: current understanding and future therapeutic implications. Expert Rev Clin Pharmacol 2022; 15:295-303. [PMID: 35481412 DOI: 10.1080/17512433.2022.2071697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION : Pain is a multidimensional experience involving the biological, psychological, and social dimensions of each individual. Particularly, the biological aspects of pain conditions are a response of the neuroimmunology system and the control of painful conditions is a worldwide challenge for researchers. Although years of investigation on pain experience and treatment exist, the high prevalence of chronic pain is still a fact. AREAS COVERED : Peroxisome proliferator-activated receptor-gamma (PPARγ) is a ligand-activated transcription factor belonging to the nuclear hormone receptor superfamily. It regulates several metabolic pathways, including lipid biosynthesis and glucose metabolism, when activated. However, PPARγ activation also has a critical immunomodulatory and neuroprotective effect. EXPERT OPINION : This review summarizes the evidence of synthetic or natural PPARγ ligands such as 15d-PGJ2, epoxyeicosatrienoic acids, thiazolidinediones, and specialized pro-resolving mediators, representing an interesting therapeutic tool for pain control.
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Affiliation(s)
- Carlos Antonio Trindade da Silva
- Laboratoy of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic Campinas, SP, Brazil
| | - Juliana Trindade Clemente-Napimoga
- Laboratoy of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic Campinas, SP, Brazil
| | - Henrique Ballassini Abdalla
- Laboratoy of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic Campinas, SP, Brazil
| | - Rosanna Tarkany Basting
- Laboratoy of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic Campinas, SP, Brazil
| | - Marcelo Henrique Napimoga
- Laboratoy of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic Campinas, SP, Brazil
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11
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Tucker L, Trumble TN, Groschen D, Dobbs E, Baldo CF, Wendt-Hornickle E, Guedes AGP. Targeting Soluble Epoxide Hydrolase and Cyclooxygenases Enhance Joint Pain Control, Stimulate Collagen Synthesis, and Protect Chondrocytes From Cytokine-Induced Apoptosis. Front Vet Sci 2021; 8:685824. [PMID: 34422942 PMCID: PMC8375305 DOI: 10.3389/fvets.2021.685824] [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: 03/25/2021] [Accepted: 07/08/2021] [Indexed: 01/06/2023] Open
Abstract
Objective: To determine the symptomatic and disease-modifying capabilities of sEH and COX inhibitors during joint inflammation. Methods: Using a blinded, randomized, crossover experimental design, 6 adult healthy horses were injected with lipopolysaccharide (LPS; 3 μg) from E. coli in a radiocarpal joint and concurrently received the non-selective cyclooxygenase (COX) inhibitor phenylbutazone (2 mg/kg), the sEH inhibitor t-TUCB (1 mg/kg) or both (2 mg/kg phenylbutazone and 0.1, 0.3, and 1 mg/kg t-TUCB) intravenously. There were at least 30 days washout between treatments. Joint pain (assessed via inertial sensors and peak vertical forces), synovial fluid concentrations of prostanoids (PGE2, TxB2), cytokines (IL-1β, IL-6, TNF-α) and biomarkers of collagen synthesis (CPII) and degradation (C2C) were measured at pre-determined intervals over a 48-h period. The anti-apoptotic effect of COX and sEH inhibitors was determined via ELISA technique in primary equine chondrocytes incubated with TNF-α (10 ng/ml) for 24 h. Apoptosis was also determined in chondrocytes incubated with sEH-generated metabolites. Results: Combined COX and sEH inhibition produced significantly better control of joint pain, prostanoid responses, and collagen synthesis-degradation balance compared to each compound separately. When administered separately, pain control was superior with COX vs. sEH inhibition. Cytokine responses were not different during COX and/or sEH inhibition. In cultured chondrocytes, sEH inhibition alone or combined with COX inhibition, but not COX inhibition alone had significant anti-apoptotic effects. However, sEH-generated metabolites caused concentration-dependent apoptosis. Conclusions: Combined COX and sEH inhibition optimize pain control, attenuate loss of articular cartilage matrix during joint inflammation and cytokine-induced chondrocyte apoptosis.
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Affiliation(s)
- Laura Tucker
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Troy N Trumble
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Donna Groschen
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Erica Dobbs
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Caroline F Baldo
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Erin Wendt-Hornickle
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Alonso G P Guedes
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
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12
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Nelson AJ, Stephenson DJ, Bone RN, Cardona CL, Park MA, Tusing YG, Lei X, Kokotos G, Graves CL, Mathews CE, Kramer J, Hessner MJ, Chalfant CE, Ramanadham S. Lipid mediators and biomarkers associated with type 1 diabetes development. JCI Insight 2020; 5:138034. [PMID: 32814707 PMCID: PMC7455134 DOI: 10.1172/jci.insight.138034] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 07/09/2020] [Indexed: 01/13/2023] Open
Abstract
Type 1 diabetes (T1D) is a consequence of autoimmune β cell destruction, but the role of lipids in this process is unknown. We previously reported that activation of Ca2+-independent phospholipase A2β (iPLA2β) modulates polarization of macrophages (MΦ). Hydrolysis of the sn-2 substituent of glycerophospholipids by iPLA2β can lead to the generation of oxidized lipids (eicosanoids), pro- and antiinflammatory, which can initiate and amplify immune responses triggering β cell death. As MΦ are early triggers of immune responses in islets, we examined the impact of iPLA2β-derived lipids (iDLs) in spontaneous-T1D prone nonobese diabetic mice (NOD), in the context of MΦ production and plasma abundances of eicosanoids and sphingolipids. We find that (a) MΦNOD exhibit a proinflammatory lipid landscape during the prediabetic phase; (b) early inhibition or genetic reduction of iPLA2β reduces production of select proinflammatory lipids, promotes antiinflammatory MΦ phenotype, and reduces T1D incidence; (c) such lipid changes are reflected in NOD plasma during the prediabetic phase and at T1D onset; and (d) importantly, similar lipid signatures are evidenced in plasma of human subjects at high risk for developing T1D. These findings suggest that iDLs contribute to T1D onset and identify select lipids that could be targeted for therapeutics and, in conjunction with autoantibodies, serve as early biomarkers of pre-T1D.
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Affiliation(s)
- Alexander J Nelson
- Department of Cell, Developmental, and Integrative Biology, and.,Comprehensive Diabetes Center, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - Daniel J Stephenson
- Department of Cell Biology, Microbiology and Molecular Biology (CMMB), University of South Florida, Tampa, Florida, USA
| | - Robert N Bone
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Christopher L Cardona
- Department of Cell Biology, Microbiology and Molecular Biology (CMMB), University of South Florida, Tampa, Florida, USA
| | - Margaret A Park
- Department of Cell Biology, Microbiology and Molecular Biology (CMMB), University of South Florida, Tampa, Florida, USA
| | - Ying G Tusing
- Department of Cell, Developmental, and Integrative Biology, and.,Comprehensive Diabetes Center, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - Xiaoyong Lei
- Department of Cell, Developmental, and Integrative Biology, and.,Comprehensive Diabetes Center, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - George Kokotos
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens, Greece
| | - Christina L Graves
- Department of Biology, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Clayton E Mathews
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida Health Science Center, Gainesville, Florida, USA
| | - Joanna Kramer
- Max McGee Research Center for Juvenile Diabetes, Department of Pediatrics at Medical College of Wisconsin and Children's Research Institute of Children's Hospital of Wisconsin, Milwaukee, Wisconsin, USA
| | - Martin J Hessner
- Max McGee Research Center for Juvenile Diabetes, Department of Pediatrics at Medical College of Wisconsin and Children's Research Institute of Children's Hospital of Wisconsin, Milwaukee, Wisconsin, USA
| | - Charles E Chalfant
- Department of Cell Biology, Microbiology and Molecular Biology (CMMB), University of South Florida, Tampa, Florida, USA.,Research Service, James A. Haley Veterans Hospital, Tampa, Florida, USA
| | - Sasanka Ramanadham
- Department of Cell, Developmental, and Integrative Biology, and.,Comprehensive Diabetes Center, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
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13
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Abdalla HB, Clemente-Napimoga JT, Trindade-da-Silva CA, Alves LJ, Prats RDS, Youssef A, Vieira Dos Santos PC, Buarque E Silva WA, Andrade E Silva F, Napimoga MH. Occlusion Heightened by Metal Crown Cementation is Aggressive for Periodontal Tissues. J Prosthodont 2020; 30:142-149. [PMID: 32783328 DOI: 10.1111/jopr.13235] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/07/2020] [Indexed: 12/29/2022] Open
Abstract
PURPOSE To investigate the effect of experimental traumatic occlusion (ETO) induced by metal crowns on alveolar bone loss. MATERIALS AND METHODS Metal crowns were custom-made for the lower first molars with occlusal discrepancy of 0.4 and 0.7 mm from the maximum intercuspation. Thirty-six animals were randomly divided into three groups (n = 12 animals per group): 0.4-mm hyperocclusion group, 0.7-mm hyperocclusion group and the sham group (no metal crown). Twenty-eight days after crown cementation, the animals were euthanized and gingival tissue was collected to assess cytokine levels of IL-17, IL-6, and TNF-α using enzyme-linked immunosorbent assay (ELISA). Mandibles were stained with 1% methylene blue and alveolar bone levels were quantified. Western blotting was used to quantify the expression of receptor activator of nuclear factor κ B (RANK), and its ligand (RANKL), secreted osteoclastogenic factor of activated T cells (SOFAT) and TNF-α-converting enzyme (TACE). Also, mandibles were histologically processed and stained with hematoxylin and eosin, from which the presence of osteoclast-like cells, multinucleated cells containing ≥3 nuclei was counted at 100× magnification. The data were analyzed using one-way ANOVA and Tukey tests. RESULTS Experimental occlusal trauma for 28 consecutive days significantly increased alveolar bone loss and multinucleated cell counts (p < 0.05). RANK, RANKL, SOFAT, TACE, IL-6, and TNF-α were significantly higher in gingival tissues of ETO groups (p < 0.05). IL-17 titers were unchanged among the groups (p > 0.05). CONCLUSION Experimental traumatic occlusion activates and sustains bone resorption pathways in the periodontium inducing alveolar bone resorption. As the intensity of occlusal trauma increased, alternative osteoclastic pathways were activated, such as TACE and SOFAT.
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Affiliation(s)
- Henrique Ballassini Abdalla
- Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Laboratoy of Neuroimmune Interface of Pain Research, Campinas, SP, Brazil
| | - Juliana Trindade Clemente-Napimoga
- Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Laboratoy of Neuroimmune Interface of Pain Research, Campinas, SP, Brazil
| | - Carlos Antônio Trindade-da-Silva
- Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Laboratoy of Neuroimmune Interface of Pain Research, Campinas, SP, Brazil
| | - Luciane Jorge Alves
- Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Immunology, Campinas, SP, Brazil
| | - Roberta da Silva Prats
- Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Immunology, Campinas, SP, Brazil
| | - Alexandre Youssef
- Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Immunology, Campinas, SP, Brazil
| | - Paulo César Vieira Dos Santos
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas - UNICAMP, Piracicaba, São Paulo, Brazil
| | - Wilkens Aurélio Buarque E Silva
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas - UNICAMP, Piracicaba, São Paulo, Brazil
| | - Frederico Andrade E Silva
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas - UNICAMP, Piracicaba, São Paulo, Brazil
| | - Marcelo Henrique Napimoga
- Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Laboratoy of Neuroimmune Interface of Pain Research, Campinas, SP, Brazil.,Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Immunology, Campinas, SP, Brazil
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14
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Peripheral soluble epoxide hydrolase inhibition reduces hypernociception and inflammation in albumin-induced arthritis in temporomandibular joint of rats. Int Immunopharmacol 2020; 87:106841. [PMID: 32736189 DOI: 10.1016/j.intimp.2020.106841] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/26/2020] [Accepted: 07/23/2020] [Indexed: 12/18/2022]
Abstract
Rheumatoid arthritis (RA) is characterized by chronic inflammation of the synovial tissue, joint dysfunction, and damage. Epoxyeicosatrienoic acids (EETs) are endogenous anti-inflammatory compounds, which are quickly converted by the soluble epoxide hydrolase (sEH) enzyme into a less active form with decreased biological effects. The inhibition of the sEH enzyme has been used as a strategy to lower nociception and inflammation. The goal of this study was to investigate whether the peripheral treatment with the sEH enzyme inhibitor 1- trifluoromethoxyphenyl-3-(1-propionylpiperidin-4-yl) urea (TPPU) could prevent the hypernociception and inflammation in the albumin-induced arthritis model in rats' temporomandibular joint (TMJ). After the induction of experimental arthritis, animals were assessed for nociceptive behavior test, leukocyte infiltration counts and histologic analysis, ELISA to quantify several cytokines and Western blotting. The peripheral pretreatment with TPPU inhibited the arthritis-induced TMJ hypernociception and leukocyte migration. Moreover, the local concentrations of proinflammatory cytokines were diminished by TPPU, while the anti-inflammatory cytokine interleukin-10 was up-regulated in the TMJ tissue. Finally, TPPU significantly decreased protein expression of iNOS, while did not alter the expression of MRC1. This study provides evidence that the peripheral administration of TPPU reduces hypernociception and inflammation in TMJ experimental arthritis.
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15
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Wagner KM, Gomes A, McReynolds CB, Hammock BD. Soluble Epoxide Hydrolase Regulation of Lipid Mediators Limits Pain. Neurotherapeutics 2020; 17:900-916. [PMID: 32875445 PMCID: PMC7609775 DOI: 10.1007/s13311-020-00916-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The role of lipids in pain signaling is well established and built on decades of knowledge about the pain and inflammation produced by prostaglandin and leukotriene metabolites of cyclooxygenase and lipoxygenase metabolism, respectively. The analgesic properties of other lipid metabolites are more recently coming to light. Lipid metabolites have been observed to act directly at ion channels and G protein-coupled receptors on nociceptive neurons as well as act indirectly at cellular membranes. Cytochrome P450 metabolism of specifically long-chain fatty acids forms epoxide metabolites, the epoxy-fatty acids (EpFA). The biological role of these metabolites has been found to mediate analgesia in several types of pain pathology. EpFA act through a variety of direct and indirect mechanisms to limit pain and inflammation including nuclear receptor agonism, limiting endoplasmic reticulum stress and blocking mitochondrial dysfunction. Small molecule inhibitors of the soluble epoxide hydrolase can stabilize the EpFA in vivo, and this approach has demonstrated relief in preclinical modeled pain pathology. Moreover, the ability to block neuroinflammation extends the potential benefit of targeting soluble epoxide hydrolase to maintain EpFA for neuroprotection in neurodegenerative disease.
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Affiliation(s)
- Karen M Wagner
- Department of Entomology and Nematology and University of California Davis Comprehensive Cancer Center, University of California Davis, One Shields Avenue, Davis, California, 95616, USA
| | - Aldrin Gomes
- Department of Neurobiology, Physiology, and Behavior, University of California, Davis, California, USA
| | - Cindy B McReynolds
- Department of Entomology and Nematology and University of California Davis Comprehensive Cancer Center, University of California Davis, One Shields Avenue, Davis, California, 95616, USA
| | - Bruce D Hammock
- Department of Entomology and Nematology and University of California Davis Comprehensive Cancer Center, University of California Davis, One Shields Avenue, Davis, California, 95616, USA.
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16
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Trindade-da-Silva CA, Clemente-Napimoga JT, Abdalla HB, Rosa SM, Ueira-Vieira C, Morisseau C, Verri WA, Montalli VAM, Hammock BD, Napimoga MH. Soluble epoxide hydrolase inhibitor, TPPU, increases regulatory T cells pathway in an arthritis model. FASEB J 2020; 34:9074-9086. [PMID: 32400048 PMCID: PMC7383812 DOI: 10.1096/fj.202000415r] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/11/2020] [Accepted: 04/16/2020] [Indexed: 12/18/2022]
Abstract
Epoxyeicosatrienoic acids (EET) and related epoxy fatty acids (EpFA) are endogenous anti‐inflammatory compounds, which are converted by the soluble epoxide hydrolase (sEH) to dihydroxylethersatrienoic acids (DHETs) with lessened biological effects. Inhibition of sEH is used as a strategy to increase EET levels leading to lower inflammation. Rheumatoid arthritis is a chronic autoimmune disease that leads to destruction of joint tissues. This pathogenesis involves a complex interplay between the immune system, and environmental factors. Here, we investigate the effects of inhibiting sEH with 1‐trifluoromethoxyphenyl‐3‐(1‐propionylpiperidin‐4‐yl) urea (TPPU) on a collagen‐induced arthritis model. The treatment with TPPU ameliorates hyperalgesia, edema, and decreases the expression of important pro‐inflammatory cytokines of Th1 and Th17 profiles, while increasing Treg cells. Considering the challenges to control RA, this study provides robust data supporting that inhibition of the sEH is a promising target to treat arthritis.
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Affiliation(s)
- Carlos A Trindade-da-Silva
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Juliana T Clemente-Napimoga
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Henrique B Abdalla
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Sergio Marcolino Rosa
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Carlos Ueira-Vieira
- Laboratory of Genetics, Institute of Biotechnology, Federal University of Uberlandia, Uberlandia, Brazil
| | - Christophe Morisseau
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - Waldiceu A Verri
- Department of Pathological Sciences, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil
| | - Victor Angelo Martins Montalli
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
| | - Bruce D Hammock
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA.,EicOsis LLC, Davis, CA, USA
| | - Marcelo H Napimoga
- Laboratory of Neuroimmune Interface of Pain Research, Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, Brazil
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17
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Rand AA, Rajamani A, Kodani SD, Harris TR, Schlatt L, Barnych B, Passerini AG, Hammock BD. Epoxyeicosatrienoic acid (EET)-stimulated angiogenesis is mediated by epoxy hydroxyeicosatrienoic acids (EHETs) formed from COX-2. J Lipid Res 2019; 60:1996-2005. [PMID: 31641036 DOI: 10.1194/jlr.m094219] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 09/27/2019] [Indexed: 12/19/2022] Open
Abstract
Epoxyeicosatrienoic acids (EETs) are formed from the metabolism of arachidonic acid by cytochrome P450s. EETs promote angiogenesis linked to tumor growth in various cancer models that is attenuated in vivo by cyclooxygenase 2 (COX-2) inhibitors. This study further defines a role for COX-2 in mediating endothelial EET metabolism promoting angiogenesis. Using human aortic endothelial cells (HAECs), we quantified 8,9-EET-induced tube formation and cell migration as indicators of angiogenic potential in the presence and absence of a COX-2 inducer [phorbol 12,13-dibutyrate (PDBu)]. The angiogenic response to 8,9-EET in the presence of PDBu was 3-fold that elicited by 8,9-EET stabilized with a soluble epoxide hydrolase inhibitor (t-TUCB). Contributing to this response was the COX-2 metabolite of 8,9-EET, the 11-hydroxy-8,9-EET (8,9,11-EHET), which exogenously enhanced angiogenic responses in HAECs at levels comparable to those elicited by vascular endothelial growth factor (VEGF). In contrast, the 15-hydroxy-8,9-EET isomer was also formed but inactive. The 8,9,11-EHET also promoted expression of the VEGF family of tyrosine kinase receptors. These results indicate that 8,9-EET-stimulated angiogenesis is enhanced by COX-2 metabolism in the endothelium through the formation of 8,9,11-EHET. This alternative pathway for the metabolism of 8,9-EET may be particularly important in regulating angiogenesis under circumstances in which COX-2 is induced, such as in cancer tumor growth and inflammation.
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Affiliation(s)
- Amy A Rand
- Department of Chemistry, Carleton University, Ottawa, ON, Canada.,Department of Entomology and Nematology, University of California, Davis, Davis, CA.,UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA
| | - Anita Rajamani
- Department of Biomedical Engineering, University of California, Davis, Davis, CA
| | - Sean D Kodani
- Department of Entomology and Nematology, University of California, Davis, Davis, CA.,UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA
| | - Todd R Harris
- Department of Chemistry, Carleton University, Ottawa, ON, Canada.,Department of Entomology and Nematology, University of California, Davis, Davis, CA.,UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA
| | - Lukas Schlatt
- Department of Entomology and Nematology, University of California, Davis, Davis, CA.,UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA
| | - Bodgan Barnych
- Department of Entomology and Nematology, University of California, Davis, Davis, CA.,UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA
| | - Anthony G Passerini
- Department of Biomedical Engineering, University of California, Davis, Davis, CA
| | - Bruce D Hammock
- Department of Entomology and Nematology, University of California, Davis, Davis, CA .,UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA
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18
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Zhang HY, Liu Q, Liu JQ, Wang J, Yang HX, Xu XJ, Xie MJ, Liu XD, Yu SB, Zhang M, Lu L, Zhang J, Wang MQ. Molecular changes in peripheral blood involving osteoarthritic joint remodelling. J Oral Rehabil 2019; 46:820-827. [PMID: 31046158 PMCID: PMC6851883 DOI: 10.1111/joor.12810] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 03/20/2019] [Accepted: 04/25/2019] [Indexed: 11/27/2022]
Abstract
Biomarkers of temporomandibular joint (TMJ) osteoarthritis (OA) remain unknown. The objective was to detect whether molecular biomarkers from peripheral blood leucocytes (PBLs) engage in TMJ OA lesions. Thirty‐four six‐week‐old Sprague Dawley rats were used. The top upregulated gene ontology categories and gene‐fold changes in PBLs were detected by a microarray analysis comparing rats that received 20‐week unilateral anterior crossbite (UAC) treatment with age‐matched controls (n = 4). Twenty weeks of UAC treatment had been reported to induce TMJ OA‐like lesions. The other twenty‐four rats were randomly placed in the UAC and control groups at 12‐ and 20‐week time points (n = 6). The mRNA expression levels of the selected biomarkers derived from the microarray analysis and their protein expression in the alveolar bone and TMJ were detected. The microarray analysis indicated that the three most highly involved genes in PBLs were Egr1, Ephx1 and Il10, which were confirmed by real‐time PCR detection. The increased protein expression levels of the three detected molecules were demonstrated in cartilage and subchondral bone (P < 0.05), and increased levels of EPHX1 were reported in discs (P < 0.05); however, increased levels were not present in the alveolar bone. Immunohistochemistry revealed the increased distribution of EGR1‐positive, EXPH1‐positive and IL10‐positive cells predominantly in the osteochondral interface, with EXPH1 also present in TMJ discs. In conclusion, the increased mRNA expression of Egr1, Ephx1 and Il10 in PBLs may serve as potential biomarkers for developed osteoarthritic lesions relating to osteochondral interface hardness changes induced by dental biomechanical stimulation.
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Affiliation(s)
- Hong-Yun Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Qian Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Jin-Qiang Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China.,School of Stomatology, The Jiamusi University, Jiamusi, China
| | - Jing Wang
- Department of Burns and Cutaneous Surgery, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
| | - Hong-Xu Yang
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Xiao-Jie Xu
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China.,The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Mian-Jiao Xie
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Xiao-Dong Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Shi-Bin Yu
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Mian Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Lei Lu
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Jing Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Mei-Qing Wang
- State Key Laboratory of Military Stomatology, National Clinical Research Centre for Oral Disease & Shaanxi International Joint Research Centre for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
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Napimoga MH, Rocha EP, Trindade-da-Silva CA, Demasi APD, Martinez EF, Macedo CG, Abdalla HB, Bettaieb A, Haj FG, Clemente-Napimoga JT, Inceoglu B, Hammock BD. Soluble epoxide hydrolase inhibitor promotes immunomodulation to inhibit bone resorption. J Periodontal Res 2018; 53:743-749. [PMID: 29851077 DOI: 10.1111/jre.12559] [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] [Accepted: 03/05/2018] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE Soluble epoxide hydrolase (sEH) is an enzyme in the arachidonate cascade which converts epoxy fatty acids (EpFAs), such as epoxyeicosatrienoic acids (EETs) produced by cytochrome P450 enzymes, to dihydroxy-eicosatrienoic acids. In the last 20 years with the development of inhibitors to sEH it has been possible to increase the levels of EETs and other EpFAs in in vivo models. Recently, studies have shown that EETs play a key role in blocking inflammation in a bone resorption process, but the mechanism is not clear. In the current study we used the sEH inhibitor (1-trifluoromethoxyphenyl-3-(1-propionylpiperidin-4-yl) urea [TPPU]) to investigate the immunomodulatory effects in a mouse periodontitis model. MATERIAL AND METHODS Mice were infected on days 0, 2, and 4 with Aggregatibacter actinomycetemcomitans and divided into groups (n = 6) that were treated orally, daily for 15 days, with 1 mg/kg of TPPU. Then, the mice were killed and their jaws were analyzed for bone resorption using morphometry. Immunoinflammatory markers in the gingival tissue were analyzed by microarray PCR or western blotting. RESULTS Infected mice treated with TPPU showed lower bone resorption than infected mice without treatment. Interestingly, infected mice showed increased expression of sEH; however, mice treated with TPPU had a reduction in expression of sEH. Besides, several proinflammatory cytokines and molecular markers were downregulated in the gingival tissue in the group treated with 1 mg/kg of TPPU. CONCLUSION The sEH inhibitor, TPPU, showed immunomodulatory effects, decreasing bone resorption and inflammatory responses in a bone resorption mouse model.
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Affiliation(s)
- M H Napimoga
- São Leopoldo Mandic Institute and Research Center, Campinas, Brazil
| | - E P Rocha
- São Leopoldo Mandic Institute and Research Center, Campinas, Brazil
| | - C A Trindade-da-Silva
- Department of Entomology and Nematology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - A P D Demasi
- São Leopoldo Mandic Institute and Research Center, Campinas, Brazil
| | - E F Martinez
- São Leopoldo Mandic Institute and Research Center, Campinas, Brazil
| | - C G Macedo
- São Leopoldo Mandic Institute and Research Center, Campinas, Brazil
| | - H B Abdalla
- Laboratory of Orofacial Pain, Department of Physiology, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - A Bettaieb
- Department of Nutrition, University of Tennessee-Knoxville, Knoxville, TN, USA
| | - F G Haj
- Nutrition Department, University of California, Davis, CA, USA
| | | | - B Inceoglu
- Department of Entomology and Nematology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
| | - B D Hammock
- Department of Entomology and Nematology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA, USA
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Souza Filho MD, Medeiros JV, Vasconcelos DF, Silva DA, Leódido AC, Fernandes HF, Silva FR, França LF, Lenardo D, Pinto GR. Orabase formulation with cashew gum polysaccharide decreases inflammatory and bone loss hallmarks in experimental periodontitis. Int J Biol Macromol 2018; 107:1093-1101. [DOI: 10.1016/j.ijbiomac.2017.09.087] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 09/16/2017] [Accepted: 09/21/2017] [Indexed: 01/14/2023]
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21
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Wagner KM, McReynolds CB, Schmidt WK, Hammock BD. Soluble epoxide hydrolase as a therapeutic target for pain, inflammatory and neurodegenerative diseases. Pharmacol Ther 2017; 180:62-76. [PMID: 28642117 PMCID: PMC5677555 DOI: 10.1016/j.pharmthera.2017.06.006] [Citation(s) in RCA: 168] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Eicosanoids are biologically active lipid signaling molecules derived from polyunsaturated fatty acids. Many of the actions of eicosanoid metabolites formed by cyclooxygenase and lipoxygenase enzymes have been characterized, however, the epoxy-fatty acids (EpFAs) formed by cytochrome P450 enzymes are newly described by comparison. The EpFA metabolites modulate a diverse set of physiologic functions that include inflammation and nociception among others. Regulation of EpFAs occurs primarily via release, biosynthesis and enzymatic transformation by the soluble epoxide hydrolase (sEH). Targeting sEH with small molecule inhibitors has enabled observation of the biological activity of the EpFAs in vivo in animal models, greatly contributing to the overall understanding of their role in the inflammatory response. Their role in modulating inflammation has been demonstrated in disease models including cardiovascular pathology and inflammatory pain, but extends to neuroinflammation and neuroinflammatory disease. Moreover, while EpFAs demonstrate activity against inflammatory pain, interestingly, this action extends to blocking chronic neuropathic pain as well. This review outlines the role of modulating sEH and the biological action of EpFAs in models of pain and inflammatory diseases.
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Affiliation(s)
- Karen M Wagner
- Department of Entomology and Nematology and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, United States
| | - Cindy B McReynolds
- Department of Entomology and Nematology and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, United States
| | | | - Bruce D Hammock
- Department of Entomology and Nematology and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, United States.
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Inceoglu B, Bettaieb A, Haj FG, Gomes AV, Hammock BD. Modulation of mitochondrial dysfunction and endoplasmic reticulum stress are key mechanisms for the wide-ranging actions of epoxy fatty acids and soluble epoxide hydrolase inhibitors. Prostaglandins Other Lipid Mediat 2017; 133:68-78. [PMID: 28847566 DOI: 10.1016/j.prostaglandins.2017.08.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Revised: 08/01/2017] [Accepted: 08/07/2017] [Indexed: 12/29/2022]
Abstract
The arachidonic acid cascade is arguably the most widely known biologic regulatory pathway. Decades after the seminal discoveries involving its cyclooxygenase and lipoxygenase branches, studies of this cascade remain an active area of research. The third and less widely known branch, the cytochrome P450 pathway leads to highly active oxygenated lipid mediators, epoxy fatty acids (EpFAs) and hydroxyeicosatetraenoic acids (HETEs), which are of similar potency to prostanoids and leukotrienes. Unlike the COX and LOX branches, no pharmaceuticals currently are marketed targeting the P450 branch. However, data support therapeutic benefits from modulating these regulatory lipid mediators. This is being approached by stabilizing or mimicking the EpFAs or even by altering the diet. These approaches lead to predominantly beneficial effects on a wide range of apparently unrelated states resulting in an enigma of how this small group of natural chemical mediators can have such diverse effects. EpFAs are degraded by soluble epoxide hydrolase (sEH) and stabilized by inhibiting this enzyme. In this review, we focus on interconnected aspects of reported mechanisms of action of EpFAs and inhibitors of soluble epoxide hydrolase (sEHI). The sEHI and EpFAs are commonly reported to maintain homeostasis under pathological conditions while remaining neutral under normal physiological conditions. Here we provide a conceptual framework for the unique and broad range of biological activities ascribed to epoxy fatty acids. We argue that their mechanism of action pivots on their ability to prevent mitochondrial dysfunction, to reduce subsequent ROS formation and to block resulting cellular signaling cascades, primarily the endoplasmic reticulum stress. By stabilizing the mitochondrial - ROS - ER stress axis, the range of activity of EpFAs and sEHI display an overlap with the disease conditions including diabetes, fibrosis, chronic pain, cardiovascular and neurodegenerative diseases, for which the above outlined mechanisms play key roles.
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Affiliation(s)
- Bora Inceoglu
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, United States.
| | - Ahmed Bettaieb
- Department of Nutrition, The University of Tennessee, Knoxville, TN 37996-0840, United States; Graduate School of Genome Science and Technology, The University of Tennessee, Knoxville, TN 37996-0840, United States.
| | - Fawaz G Haj
- Department of Nutrition, University of California Davis, CA 95616, United States; Division of Endocrinology, Diabetes and Metabolism, Department of Internal Medicine, University of California Davis, Sacramento, CA 95817, United States
| | - Aldrin V Gomes
- Department of Neurobiology, Physiology, and Behavior, University of California Davis, Davis, CA 95616, United States; Department of Physiology and Membrane Biology, University of California Davis, Davis, CA 95616, United States
| | - Bruce D Hammock
- Department of Entomology and Nematology, UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, United States
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