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Harsch BA, Borkowski K, Walker RE, Pedersen TL, Newman JW, Shearer GC. ABCA1 and apoA-I dependent 12-hydroxyeicosatetraenoic acid efflux regulates macrophage inflammatory signaling. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.11.603001. [PMID: 39026807 PMCID: PMC11257534 DOI: 10.1101/2024.07.11.603001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Aberrant high-density lipoprotein (HDL) function is implicated in inflammation-associated pathologies. While HDL ABCA1-mediated reverse cholesterol and phospholipid transport are well described, the movement of pro-/anti-inflammatory lipids has not been explored. HDL phospholipids are the largest reservoir of circulating arachidonic acid-derived oxylipins. Endotoxin-stimulation activates inflammatory cells leading to hydroxyeicosatetraenoic acid (HETE) production, oxylipins which are involved in inflammatory response coordination. Active signaling in the non-esterified (NE) pool is terminated by sequestration of HETEs as esterified (Es) forms and degradation. We speculate that an ABCA1-apoA-I-dependent efflux of HETEs from stimulated cells could regulate intracellular HETE availability. Here we test this hypothesis both in vitro and in vivo. In endotoxin-stimulated RAW-264.7 macrophages preloaded with d8-arachidonic acid we use compartmental tracer modeling to characterize the formation of HETEs, and their efflux into HDL. We found that in response to endotoxin: I) Cellular NE 12-HETE is positively associated with MCP-1 secretion (p<0.001); II) HETE transfer from NE to Es pools is ABCA1-depedent (p<0.001); III) Cellular Es HETEs are transported into media when both apoA-I and ABCA1 are present (p<0.001); IV) The stimulated efflux of HETEs >> arachidonate (p<0.001). Finally, in endotoxin challenged humans (n=17), we demonstrate that intravenous lipopolysaccharide (0.6 ng/kg body weight) resulted in accumulation of 12-HETE in HDL over a 168-hour follow-up. Therefore, HDL can suppress inflammatory responses in macrophages by regulating intracellular HETE content in an apoA-I/ABCA1 dependent manner. The described mechanism may apply to other oxylipins and explain anti-inflammatory properties of HDL. This newly defined HDL property opens new doors for the study of lipoprotein interactions in metabolic diseases.
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2
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Helal SA, Gerges SH, El-Kadi AOS. Enantioselectivity in some physiological and pathophysiological roles of hydroxyeicosatetraenoic acids. Drug Metab Rev 2024; 56:31-45. [PMID: 38358327 DOI: 10.1080/03602532.2023.2284110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 11/12/2023] [Indexed: 02/16/2024]
Abstract
The phenomenon of chirality has been shown to greatly impact drug activities and effects. Different enantiomers may exhibit different effects in a certain biological condition or disease state. Cytochrome P450 (CYP) enzymes metabolize arachidonic acid (AA) into a large variety of metabolites with a wide range of activities. Hydroxylation of AA by CYP hydroxylases produces hydroxyeicosatetraenoic acids (HETEs), which are classified into mid-chain (5, 8, 9, 11, 12, and 15-HETE), subterminal (16-, 17-, 18- and 19-HETE) and terminal (20-HETE) HETEs. Except for 20-HETE, these metabolites exist as a racemic mixture of R and S enantiomers in the physiological system. The two enantiomers could have different degrees of activity or sometimes opposing effects. In this review article, we aimed to discuss the role of mid-chain and subterminal HETEs in different organs, importantly the heart and the kidneys. Moreover, we summarized their effects in some conditions such as neutrophil migration, inflammation, angiogenesis, and tumorigenesis, with a focus on the reported enantiospecific effects. We also reported some studies using genetically modified models to investigate the roles of HETEs in different conditions.
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Affiliation(s)
- Sara A Helal
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
| | - Samar H Gerges
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
| | - Ayman O S El-Kadi
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
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3
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Ludovico ID, Sarkar S, Elliott E, Virtanen SM, Erlund I, Ramanadham S, Mirmira RG, Metz TO, Nakayasu ES. Fatty acid-mediated signaling as a target for developing type 1 diabetes therapies. Expert Opin Ther Targets 2023; 27:793-806. [PMID: 37706269 PMCID: PMC10591803 DOI: 10.1080/14728222.2023.2259099] [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: 05/22/2023] [Accepted: 09/11/2023] [Indexed: 09/15/2023]
Abstract
INTRODUCTION Type 1 diabetes (T1D) is an autoimmune disease in which pro-inflammatory and cytotoxic signaling drive the death of the insulin-producing β cells. This complex signaling is regulated in part by fatty acids and their bioproducts, making them excellent therapeutic targets. AREAS COVERED We provide an overview of the fatty acid actions on β cells by discussing how they can cause lipotoxicity or regulate inflammatory response during insulitis. We also discuss how diet can affect the availability of fatty acids and disease development. Finally, we discuss development avenues that need further exploration. EXPERT OPINION Fatty acids, such as hydroxyl fatty acids, ω-3 fatty acids, and their downstream products, are druggable candidates that promote protective signaling. Inhibitors and antagonists of enzymes and receptors of arachidonic acid and free fatty acids, along with their derived metabolites, which cause pro-inflammatory and cytotoxic responses, have the potential to be developed as therapeutic targets also. Further, because diet is the main source of fatty acid intake in humans, balancing protective and pro-inflammatory/cytotoxic fatty acid levels through dietary therapy may have beneficial effects, delaying T1D progression. Therefore, therapeutic interventions targeting fatty acid signaling hold potential as avenues to treat T1D.
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Affiliation(s)
- Ivo Díaz Ludovico
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Soumyadeep Sarkar
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Emily Elliott
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Suvi M. Virtanen
- Health and Well-Being Promotion Unit, Finnish Institute for Health and Welfare, Helsinki, Finland
- Faculty of Social Sciences, Unit of Health Sciences, Tampere University, Tampere, Finland
- Tampere University Hospital, Research, Development and Innovation Center, Tampere, Finland
- Center for Child Health Research, Tampere University and Tampere University Hospital, Tampere, Finland
| | - Iris Erlund
- Department of Governmental Services, Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Sasanka Ramanadham
- Department of Cell, Developmental, and Integrative Biology, and Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Raghavendra G. Mirmira
- Kovler Diabetes Center, Department of Medicine, The University of Chicago, Chicago, IL, USA
| | - Thomas O. Metz
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Ernesto S. Nakayasu
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
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4
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Wu S, Wang C, Yao M, Han D, Li Q. Photothermal lipolysis accelerates ECM production via macrophage-derived ALOX15-mediated p38 MAPK activation in fibroblasts. JOURNAL OF BIOPHOTONICS 2023; 16:e202200321. [PMID: 36529997 DOI: 10.1002/jbio.202200321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 12/05/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Skin and subcutaneous tissue tightening is usually treated by noninvasive photothermal treatment for medical esthetics purpose, while the underlying mechanism remains to be elucidated. Here, we hypothesized that adipocyte injury, as a stimulator, may regulate extracellular matrix (ECM) production by increasing ALOX15 in macrophages, which could lead to fibroblast activation. In this study, we show that lipolysis was induced by laser heating (45°C for 15 min) in patients and rats, and adipocyte thermal injury stimulates the ECM production in fibroblasts by ALOX15 that was increased in cocultured macrophages. These phenomena were evidenced by the ALOX15 knockdown. In addition, ALOX15 metabolite 12(S)-HETE activated p38 MAPK signaling pathway that mediated the production of ECM in fibroblast. In summary, the results of this study demonstrate that the mechanisms of adipose photothermal injury-induced skin and/or subcutaneous tissue tightening may have clinical relevance for noninvasive or minimally invasive photothermal therapeutics.
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Affiliation(s)
- Shan Wu
- Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Caixia Wang
- Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Min Yao
- Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Institute of Traumatic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dong Han
- Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Qingfeng Li
- Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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5
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Kadoguchi T, Shimada K, Fukui N, Tanaka N, Tsuno H, Shiozawa T, Fukao K, Nishitani-Yokoyama M, Isoda K, Matsushita S, Yokoyama N, Daida H. Accumulation of polyunsaturated fatty acid-derived metabolites in the sarcopenic muscle of aging mice. Geriatr Gerontol Int 2023; 23:297-303. [PMID: 36811314 DOI: 10.1111/ggi.14561] [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: 04/06/2022] [Revised: 12/26/2022] [Accepted: 01/27/2023] [Indexed: 02/24/2023]
Abstract
AIM Although it is known that advanced age alters skeletal muscle lipid metabolism, the role(s) of polyunsaturated fatty acid-derived metabolites (mostly eicosanoids and docosanoids) in sarcopenia are not clear. We therefore examined the changes in the metabolites of arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid in the sarcopenic muscle of aged mice. METHODS We used 6- and 24-month-old male C57BL/6J mice as healthy and sarcopenic muscle models, respectively. Skeletal muscles were removed from the lower limb and subjected to a liquid chromatography-tandem mass spectrometry analysis. RESULTS The liquid chromatography-tandem mass spectrometry analysis detected distinct changes of metabolites in the muscles of the aged mice. Of the 63 metabolites identified, nine were significantly higher in the sarcopenic muscle of aged mice compared with the healthy muscle of young mice. In particular, prostaglandin E2 , prostaglandin F2a , thromboxane B2 , 5-hydroxyeicosatetraenoic acid, and 15-oxo-eicosatetraenoic acid (arachidonic acid-derived metabolites), 12-hydroxy-eicosapentaenoic acid and 14,15-epoxy-eicosatetraenoic acid (eicosapentaenoic acid-derived metabolites) and 10-hydroxydocosa-hexaenoic acid and 14-hydroxyoctadeca-pentaenoic acid (docosahexaenoic acid-derived metabolites) were significantly higher in aged tissue compared with young tissue (all P < 0.05). CONCLUSIONS We observed the accumulation of metabolites in the sarcopenic muscle of aged mice. Our results may provide new insights into the pathogenesis and progression of aging- or disease-related sarcopenia. Geriatr Gerontol Int ••; ••: ••-•• Geriatr Gerontol Int 2023; ••: ••-••.
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Affiliation(s)
- Tomoyasu Kadoguchi
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kazunori Shimada
- Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Naoshi Fukui
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.,Clinical Research Center, National Hospital Organization Sagamihara Hospital, Sagamihara, Japan
| | - Nobuho Tanaka
- Clinical Research Center, National Hospital Organization Sagamihara Hospital, Sagamihara, Japan
| | - Hirotaka Tsuno
- Clinical Research Center, National Hospital Organization Sagamihara Hospital, Sagamihara, Japan
| | - Tomoyuki Shiozawa
- Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Cardiovascular Medicine, Juntendo University Shizuoka Hospital, Izunokuni, Japan
| | - Kosuke Fukao
- Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Graduate School of Health and Sports Science, Juntendo University, Chiba, Japan
| | - Miho Nishitani-Yokoyama
- Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kikuo Isoda
- Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Satoshi Matsushita
- Department of Cardiovascular Surgery, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Norihiko Yokoyama
- Department of Cardiovascular Surgery, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hiroyuki Daida
- Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Faculty of Health Science, Juntendo University, Tokyo, Japan
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6
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Lin Y, Lu X, Qiu X, Yin F, Faull KF, Tseng CH, Zhang JJ, Fiehn O, Zhu T, Araujo JA, Zhu Y. Arachidonic acid metabolism and inflammatory biomarkers associated with exposure to polycyclic aromatic hydrocarbons. ENVIRONMENTAL RESEARCH 2022; 212:113498. [PMID: 35613629 DOI: 10.1016/j.envres.2022.113498] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 05/11/2022] [Accepted: 05/15/2022] [Indexed: 06/15/2023]
Abstract
Exposure to polycyclic aromatic hydrocarbons (PAHs) has been associated with systemic inflammation, yet what mechanisms regulate PAHs' inflammatory effects are less understood. This study evaluated the change of arachidonic acid (ARA) metabolites and inflammatory biomarkers in response to increased exposure to PAHs among 26 non-smoking healthy travelers from Los Angeles to Beijing. Traveling from Los Angeles to Beijing significantly increased urinary metabolites of dibenzofuran (800%), fluorene (568%), phenanthrene (277%), and pyrene (176%), accompanied with increased C-reactive protein, fibrinogen, IL-8, and IL-10, and decreased MCP-1, sCD40L, and sCD62P levels in the blood. Meanwhile, the travel increased the levels of ARA lipoxygenase metabolites that were positively associated with a panel of pro-inflammatory biomarkers. Concentrations of cytochrome P450 metabolite were also increased in Beijing and were negatively associated with sCD62P levels. In contrast, concentrations of ARA cyclooxygenase metabolites were decreased in Beijing and were negatively associated with anti-inflammatory IL-10 levels. Changes in both inflammatory biomarkers and ARA metabolites were reversed 4-7 weeks after participants returned to Los Angeles and were associated with urinary PAH metabolites, but not with other exposures such as secondhand smoke, stress, or diet. These results suggested possible roles of ARA metabolic alteration in PAHs-associated inflammatory effects.
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Affiliation(s)
- Yan Lin
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Xinchen Lu
- State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, And Center for Environment and Health, Peking University, Beijing 100871, PR China
| | - Xinghua Qiu
- State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, And Center for Environment and Health, Peking University, Beijing 100871, PR China.
| | - Fen Yin
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Kym F Faull
- Pasarow Mass Spectrometry Laboratory, Jane and Terry Semel Institute for Neuroscience and Human Behavior and Department of Psychiatry & Behavioral Sciences, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Chi-Hong Tseng
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Junfeng Jim Zhang
- Global Health Institute, Nicholas School of the Environment, Duke University, Durham, NC 27705, USA
| | - Oliver Fiehn
- NIH-West Coast Metabolomics Center, University of California, Davis, 451 Health Sciences Drive, Davis, CA 95616, USA
| | - Tong Zhu
- State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, And Center for Environment and Health, Peking University, Beijing 100871, PR China
| | - Jesus A Araujo
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90095, USA; Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA 90095, USA; Molecular Biology Institute, University of California Los Angeles, Los Angeles, CA 90095, USA.
| | - Yifang Zhu
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90095, USA.
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7
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Zhan Z, Zhang T, Dai F, Wen X, Chen Y, Jiang H, Gu T, Cheng Y, Tang L. Effect of oridonin on oxylipins in the livers of mice with acute liver injury induced by D-galactosamine and lipopolysaccharide. Int Immunopharmacol 2022; 102:108387. [PMID: 34838489 DOI: 10.1016/j.intimp.2021.108387] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 11/15/2021] [Accepted: 11/18/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND PURPOSE Oridonin (Ori) has been shown to protect against acute liver injury (ALI) induced by D-galactosamine (D-GalN) and lipopolysaccharide (LPS). Oxylipins are oxidation products of polyunsaturated fatty acids (PUFAs) and are key proinflammatory mediators. This study aimed to investigate the changes in oxylipins in the livers of mice with D-GalN/LPS-induced ALI and the effects of Ori on these changes. RESULTS 54 oxylipins in liver tissues were identified and qualitatively and quantitatively analyzed by ultra-performance liquid chromatography-electrospray ionization triple quadrupole mass spectrometry (UPLC-QTRAP/MS/MS). The levels of 12-HETE, 12-HEPE, 14(S)-HDHA, PGE2, dihomo-γ-linolenic acid and 13-HOTrE in the liver were significantly increased in the D-GalN/LPS-induced ALI group compared with the control group, and the levels of EPA and 7-HDHA were significantly decreased. However, pretreatment with Ori dramatically decreased the levels of 12-HETE, 12-HEPE, 14(S)-HDHA, PGE2 and 13-HOTrE compared with those of the ALI group and induced 7-HDHA and 15-oxoETE. Moreover, Ori reduced the protein levels of COX-1, COX-2, ALOX5, ALOX12 and ALOX15 induced by D-GalN/LPS, indicating that Ori altered oxylipins through the COX and LOX pathways. CONCLUSIONS These results suggest that the protective effect of Ori on ALI is partly mediated by affecting the oxylipin pathway.
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Affiliation(s)
- Zhikun Zhan
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Tao Zhang
- Department of Pharmaceutical, Guangzhou Women and Children's Medical Center, Guangzhou, Guangdong 5101201 China
| | - Fahong Dai
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Xin Wen
- Department of Clinical Research Centre, ZhuJiang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China
| | - Yulian Chen
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Huanguo Jiang
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Tanwei Gu
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Yuan Cheng
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China; Department of Hepatobiliary Surgery II, ZhuJiang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China.
| | - Lan Tang
- NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China.
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8
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Reeves AR, Sansbury BE, Pan M, Han X, Spite M, Greenberg AS. Myeloid-Specific Deficiency of Long-Chain Acyl CoA Synthetase 4 Reduces Inflammation by Remodeling Phospholipids and Reducing Production of Arachidonic Acid-Derived Proinflammatory Lipid Mediators. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2021; 207:2744-2753. [PMID: 34725110 PMCID: PMC8802997 DOI: 10.4049/jimmunol.2100393] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 09/14/2021] [Indexed: 12/19/2022]
Abstract
In response to infection or tissue damage, resident peritoneal macrophages (rpMACs) produce inflammatory lipid mediators from the polyunsaturated fatty acid (PUFA), arachidonic acid (AA). Long-chain acyl-CoA synthetase 4 (ACSL4) catalyzes the covalent addition of a CoA moiety to fatty acids, with a strong preference for AA and other PUFAs containing three or more double bonds. PUFA-CoA can be incorporated into phospholipids, which is the source of PUFA for lipid mediator synthesis. In this study, we demonstrated that deficiency of Acsl4 in mouse rpMACs resulted in a significant reduction of AA incorporated into all phospholipid classes and a reciprocal increase in incorporation of oleic acid and linoleic acid. After stimulation with opsonized zymosan (opZym), a diverse array of AA-derived lipid mediators, including leukotrienes, PGs, hydroxyeicosatetraenoic acids, and lipoxins, were produced and were significantly reduced in Acsl4-deficient rpMACs. The Acsl4-deficient rpMACs stimulated with opZym also demonstrated an acute reduction in mRNA expression of the inflammatory cytokines, Il6, Ccl2, Nos2, and Ccl5 When Acsl4-deficient rpMACs were incubated in vitro with the TLR4 agonist, LPS, the levels of leukotriene B4 and PGE2 were also significantly decreased. In LPS-induced peritonitis, mice with myeloid-specific Acsl4 deficiency had a significant reduction in leukotriene B4 and PGE2 levels in peritoneal exudates, which was coupled with reduced infiltration of neutrophils in the peritoneal cavity as compared with wild-type mice. Our data demonstrate that chronic deficiency of Acsl4 in rpMACs reduces the incorporation of AA into phospholipids, which reduces lipid mediator synthesis and inflammation.
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Affiliation(s)
- Andrew R Reeves
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
| | - Brian E Sansbury
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA; and
| | - Meixia Pan
- Barshop Institute for Longevity and Aging Research, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Xianlin Han
- Barshop Institute for Longevity and Aging Research, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Matthew Spite
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA; and
| | - Andrew S Greenberg
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA;
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9
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Man J, Wu L, Han P, Hao Y, Li J, Gao Z, Wang J, Yang W, Tian Y. Revealing the metabolic mechanism of dandelion extract against A549 cells using UPLC-QTOF MS. Biomed Chromatogr 2021; 36:e5272. [PMID: 34727378 DOI: 10.1002/bmc.5272] [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: 05/26/2021] [Revised: 10/19/2021] [Accepted: 10/23/2021] [Indexed: 11/08/2022]
Abstract
Dandelion extract shows potential anticancer activity and is expected to be a new type of natural anti-cancer drug. However, the effect mechanism of dandelion extract to lung cancer cells is still unclear. Here, untargeted metabolomics approach based on liquid chromatography-mass spectrograph (LC-MS) was used to characterize the metabolic responses of A549 cell to dandelion extract exposure, to provide new clues for the anti-tumor mechanism of dandelion extract from the perspective of metabolomics. A total of 16 differentially expressed and time-related metabolites were identified between dandelion extract exposure and control groups. The perturbed metabolic pathways of A549 cells after dandelion extract exposure mainly include the glycerophospholipid metabolism and purine metabolism. These results concluded that dandelion extract may exert anticancer activity by affecting the malignant proliferation, disturbing the stability of cell membrane structure, reducing the adhesion of tumor cells to extracellular matrix and fibronectin and finally inducing tumor cell death.
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Affiliation(s)
- Jin Man
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | | | - Pei Han
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Yun Hao
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Jiaying Li
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Zibo Gao
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Jia Wang
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Wenjie Yang
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Yongmei Tian
- College of Public Health, Zhengzhou University, Zhengzhou, Henan, P.R. China
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10
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Zhu K, Browne RW, Blair RH, Bonner MR, Tian M, Niu Z, Deng F, Farhat Z, Mu L. Changes in arachidonic acid (AA)- and linoleic acid (LA)-derived hydroxy metabolites and their interplay with inflammatory biomarkers in response to drastic changes in air pollution exposure. ENVIRONMENTAL RESEARCH 2021; 200:111401. [PMID: 34089746 DOI: 10.1016/j.envres.2021.111401] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/20/2021] [Accepted: 05/23/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Untargeted metabolomics analyses have indicated that fatty acids and their hydroxy derivatives may be important metabolites in the mechanism through which air pollution potentiates diseases. This study aimed to use targeted analysis to investigate how metabolites in arachidonic acid (AA) and linoleic acid (LA) pathways respond to short-term changes in air pollution exposure. We further explored how they might interact with markers of antioxidant enzymes and systemic inflammation. METHODS This study included a subset of participants (n = 53) from the Beijing Olympics Air Pollution (BoaP) study in which blood samples were collected before, during, and after the Beijing Olympics. Hydroxy fatty acids were measured by liquid chromatography/mass spectrometry (LC/MS). Native total fatty acids were measured as fatty acid methyl esters (FAMEs) using gas chromatography. A set of chemokines were measured by ELISA-based chemiluminescent assay and antioxidant enzyme activities were analyzed by kinetic enzyme assays. Changes in levels of metabolites over the three time points were examined using linear mixed-effects models, adjusting for age, sex, body mass index (BMI), and smoking status. Pearson correlation and repeated measures correlation coefficients were calculated to explore the relationships of metabolites with levels of serum chemokines and antioxidant enzymes. RESULTS 12-hydroxyeicosatetraenoic acid (12-HETE) decreased by 50.5% (95% CI: -66.5, -34.5; p < 0.0001) when air pollution dropped during the Olympics and increased by 119.4% (95% CI: 36.4, 202.3; p < 0.0001) when air pollution returned to high levels after the Olympics. In contrast, 13-hydroxyoctadecadienoic acid (13-HODE) elevated significantly (p = 0.023) during the Olympics and decreased nonsignificantly after the games (p = 0.104). Interleukin 8 (IL-8) correlated with 12-HETE (r = 0.399, BH-adjusted p = 0.004) and 13-HODE (r = 0.342, BH-adjusted p = 0.014) over the three points; it presented a positive and moderate correlation with 12-HETE during the Olympics (r = 0.583, BH-adjusted p = 0.002) and with 13-HODE before the Olympics (r = 0.543, BH-adjusted p = 0.008). CONCLUSION AA- and LA-derived hydroxy metabolites are associated with air pollution and might interact with systemic inflammation in response to air pollution exposure.
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Affiliation(s)
- Kexin Zhu
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Richard W Browne
- Department of Biotechnical and Clinical Laboratory Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Rachael Hageman Blair
- Department of Biostatistics, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Matthew R Bonner
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Mingmei Tian
- Department of Biostatistics, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Zhongzheng Niu
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Furong Deng
- Department of Occupational and Environmental Health, School of Public Health, Peking University, Beijing, China
| | - Zeinab Farhat
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - Lina Mu
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, The State University of New York, Buffalo, NY, USA.
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11
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The Impact of the Ca 2+-Independent Phospholipase A 2β (iPLA 2β) on Immune Cells. Biomolecules 2021; 11:biom11040577. [PMID: 33920898 PMCID: PMC8071342 DOI: 10.3390/biom11040577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/06/2021] [Accepted: 04/12/2021] [Indexed: 12/31/2022] Open
Abstract
The Ca2+-independent phospholipase A2β (iPLA2β) is a member of the PLA2 family that has been proposed to have roles in multiple biological processes including membrane remodeling, cell proliferation, bone formation, male fertility, cell death, and signaling. Such involvement has led to the identification of iPLA2β activation in several diseases such as cancer, cardiovascular abnormalities, glaucoma, periodontitis, neurological disorders, diabetes, and other metabolic disorders. More recently, there has been heightened interest in the role that iPLA2β plays in promoting inflammation. Recognizing the potential contribution of iPLA2β in the development of autoimmune diseases, we review this issue in the context of an iPLA2β link with macrophages and T-cells.
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12
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So J, Wu D, Lichtenstein AH, Tai AK, Matthan NR, Maddipati KR, Lamon-Fava S. EPA and DHA differentially modulate monocyte inflammatory response in subjects with chronic inflammation in part via plasma specialized pro-resolving lipid mediators: A randomized, double-blind, crossover study. Atherosclerosis 2020; 316:90-98. [PMID: 33303222 DOI: 10.1016/j.atherosclerosis.2020.11.018] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 10/23/2020] [Accepted: 11/18/2020] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND AIMS The independent effects of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on chronic inflammation through their downstream lipid mediators, including the specialized pro-resolving lipid mediators (SPM), remain unstudied. Therefore, we compared the effects of EPA and DHA supplementation on monocyte inflammatory response and plasma polyunsaturated fatty acids (PUFA) SPM lipidome. METHODS After a 4-week lead-in phase (baseline), 9 men and 12 postmenopausal women (50-75 years) with chronic inflammation received two phases of 10-week supplementation with 3 g/day EPA and DHA in a random order, separated by a 10-week washout. RESULTS Compared with baseline, EPA and DHA supplementation differently modulated LPS-stimulated monocyte cytokine expression. EPA lowered TNFA (p < 0.001) whereas DHA reduced TNFA (p < 0.001), IL6 (p < 0.02), MCP1 (p < 0.03), and IL10 (p < 0.01). DHA lowered IL10 expression relative to EPA (p = 0.03). Relative to baseline, EPA, but not DHA, decreased the ratios of TNFA/IL10 and MCP1/IL10 (both p < 0.01). EPA and DHA also significantly changed plasma PUFA SPM lipidome by replacing n-6 AA derivatives with their respective derivatives including 18-hydroxy-EPA (+5 fold by EPA) and 17- and 14-hydroxy-DHA (+3 folds by DHA). However, DHA showed a wider effect than EPA by also significantly increasing EPA derivatives and DPA-derived SPM at a greater expense of AA derivatives. Different groups of PUFA derivatives mediated the differential effects of EPA and DHA on monocyte cytokine expression. CONCLUSIONS EPA and DHA had distinct effects on monocyte inflammatory response with a broader effect of DHA in attenuating pro-inflammatory cytokines. These differential effects were potentially mediated by different groups of PUFA derivatives, suggesting immunomodulatory activities of SPM and their intermediates.
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Affiliation(s)
- Jisun So
- Cardiovascular Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA
| | - Dayong Wu
- Nutritional Immunology Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA
| | - Alice H Lichtenstein
- Cardiovascular Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA
| | - Albert K Tai
- Department of Immunology, Tufts University School of Medicine, Boston, MA, USA
| | - Nirupa R Matthan
- Cardiovascular Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA
| | - Krishna Rao Maddipati
- Department of Pathology, Lipidomics Core Facility, Wayne State University, Detroit, MI, USA
| | - Stefania Lamon-Fava
- Cardiovascular Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA.
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13
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Yang L, Cheng Q, Huang Q, Liang H, Luo Y. Assessment of plasma 12(S)-Hydroxyeicosatetraenoic acid as a biomarker to predict mortality in adults with severe trauma. BURNS & TRAUMA 2020; 8:tkaa034. [PMID: 32904748 PMCID: PMC7459147 DOI: 10.1093/burnst/tkaa034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/10/2020] [Accepted: 07/10/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Liping Yang
- Department of Laboratory Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qian Cheng
- Department of Laboratory Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qi Huang
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Wound Infection and Drug, Army Medical Center (Daping Hospital), Army Medical University, Chongqing, 400042, China
| | - Huaping Liang
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Wound Infection and Drug, Army Medical Center (Daping Hospital), Army Medical University, Chongqing, 400042, China
| | - Yan Luo
- Department of Laboratory Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Alpha-linolenic acid enhances the phagocytic and secretory functions of alternatively activated macrophages in part via changes to the oxylipin profile. Int J Biochem Cell Biol 2020; 119:105662. [DOI: 10.1016/j.biocel.2019.105662] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Revised: 11/30/2019] [Accepted: 12/03/2019] [Indexed: 12/21/2022]
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15
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Moreira V, Gutiérrez JM, Lomonte B, Vinolo MAR, Curi R, Lambeau G, Teixeira C. 12-HETE is a regulator of PGE 2 production via COX-2 expression induced by a snake venom group IIA phospholipase A 2 in isolated peritoneal macrophages. Chem Biol Interact 2019; 317:108903. [PMID: 31811862 DOI: 10.1016/j.cbi.2019.108903] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 11/03/2019] [Accepted: 11/17/2019] [Indexed: 02/07/2023]
Abstract
The snake venom miotoxin (MT)-III is a group IIA secreted phospholipase A2 (sPLA2) with pro-inflammatory activities. Previous studies have demonstrated that MT-III has the ability to stimulate macrophages to release inflammatory lipid mediators derived from arachidonic acid metabolism. Among them, we highlight prostaglandin (PG)E2 produced by the cyclooxygenase (COX)-2 pathway, through activation of nuclear factor (NF)-κB. However, the mechanisms coordinating this process are not fully understood. This study investigates the regulatory mechanisms exerted by other groups of bioactive eicosanoids derived from 12-lipoxygenase (12-LO), in particular 12-hydroxyeicosatetraenoic (12-HETE), on group IIA sPLA2-induced (i) PGE2 release, (ii) COX-2 expression, and (iii) activation of signaling pathways p38 mitogen-activated protein kinases(p38MAPK), protein C kinase (PKC), extracellular signal-regulated kinase 1/2 (ERK1/2), and NF-κB. Stimulation of macrophages with group IIA sPLA2 resulted in release of 12-HETE without modification of 12-LO protein levels. Pre-treatment of these cells with baicalein, a 12-LO inhibitor, decreased the sPLA2-induced PGE2 production, significantly reduced COX-2 expression, and inhibited sPLA2-induced ERK; however, it did not affect p38MAPK or PKC phosphorylation. In turn, sPLA2-induced PGE2 release and COX-2 expression, but not NF-κB activation, was attenuated by pre-treating macrophages with PD98059 an inhibitor of ERK1/2. These results suggest that, in macrophages, group IIA sPLA2-induced PGE2 release and COX-2 protein expression are distinctly mediated through 12-HETE followed by ERK1/2 pathway activation, independently of NF-κB activation. These findings highlight an as yet undescribed mechanism by which 12-HETE regulates one of the distinct signaling pathways for snake venom group IIA sPLA2-induced PGE2 release and COX-2 expression in macrophages.
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Affiliation(s)
- Vanessa Moreira
- Departamento de Farmacologia, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
| | - José María Gutiérrez
- Instituto Clodomiro Picado, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica
| | - Bruno Lomonte
- Instituto Clodomiro Picado, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica
| | - Marco Aurélio Ramirez Vinolo
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade de Campinas, Campinas, SP, Brazil
| | - Rui Curi
- Departamento de Fisiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Gérard Lambeau
- Université Côte d'Azur, CNRS, IPMC, Valbonne Sophia Antipolis, France
| | - Catarina Teixeira
- Laboratório de Farmacologia, Instituto Butantan, São Paulo, SP, Brazil
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Darwesh AM, Sosnowski DK, Lee TYT, Keshavarz-Bahaghighat H, Seubert JM. Insights into the cardioprotective properties of n-3 PUFAs against ischemic heart disease via modulation of the innate immune system. Chem Biol Interact 2019; 308:20-44. [DOI: 10.1016/j.cbi.2019.04.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 04/17/2019] [Accepted: 04/30/2019] [Indexed: 12/19/2022]
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17
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Manega CM, Fiorelli S, Porro B, Turnu L, Cavalca V, Bonomi A, Cosentino N, Di Minno A, Marenzi G, Tremoli E, Eligini S. 12(S)-Hydroxyeicosatetraenoic acid downregulates monocyte-derived macrophage efferocytosis: New insights in atherosclerosis. Pharmacol Res 2019; 144:336-342. [PMID: 31028904 DOI: 10.1016/j.phrs.2019.03.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 03/11/2019] [Accepted: 03/11/2019] [Indexed: 11/24/2022]
Abstract
The involvement of 12(S)-hydroxyeicosatetraenoic acid (12(S)-HETE), a 12-lipooxygenase product of arachidonic acid, has been suggested in atherosclerosis. However, its effect on macrophage functions is not completely understood, so far. The uptake of apoptotic cells (efferocytosis) by macrophages is an anti-inflammatory process, impaired in advanced atherosclerotic lesions. This process induces the release of the anti-inflammatory cytokine interleukin-10 (IL-10), and it is regulated by Rho-GTPases, whose activation involves the isoprenylation, a modification inhibited by statins. We assessed 12-HETE levels in serum of coronary artery disease (CAD) patients, and explored 12(S)-HETE in vitro effect on monocyte-derived macrophage (MDM) efferocytosis. Sixty-four CAD patients and 24 healthy subjects (HS) were enrolled. Serum 12-HETE levels were measured using a tandem mass spectrometry method. MDMs, obtained from a spontaneous differentiation of adherent monocytes, were treated with 12(S)-HETE (10-50 ng/mL). Efferocytosis and RhoA activation were evaluated by flow cytometry. IL-10 was measured by ELISA. CAD patients showed increased 12-HETE serum levels compared to HS (665.2 [438.1-896.2] ng/mL and 525.1 [380.1-750.1] ng/mL, respectively, p < 0.05) and reduced levels of IL-10. MDMs expressed the 12(S)-HETE cognate receptor GPR31. CAD-derived MDMs displayed defective efferocytosis vs HS-MDMs (9.4 [7.7-11.3]% and 11.1 [9.6-14.1]% of MDMs that have engulfed apoptotic cells, respectively, p < 0.01). This reduction is marked in MDMs obtained from patients not treated with statin (9.3 [7.4-10.6]% statin-free CAD vs HS, p = 0.01; and 9.9 [8.6-11.6]% statin-treated CAD vs HS, p = 0.07). The in vitro treatment of MDMs with 12(S)-HETE (20 ng/mL) induced 20% decrease of efferocytosis (p < 0.01) and 71% increase of RhoA activated form (p < 0.05). Atorvastatin (0.1 μM) counteracted these 12(S)-HETE-mediated effects.These results show a 12(S)-HETE pro-inflammatory effect and suggest a new potential contribution of this mediator in the development of atherosclerosis.
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Affiliation(s)
| | | | | | - Linda Turnu
- Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
| | | | - Alice Bonomi
- Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
| | | | | | | | - Elena Tremoli
- Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
| | - Sonia Eligini
- Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
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Reduced Number of Adipose Lineage and Endothelial Cells in Epididymal fat in Response to Omega-3 PUFA in Mice Fed High-Fat Diet. Mar Drugs 2018; 16:md16120515. [PMID: 30567329 PMCID: PMC6316446 DOI: 10.3390/md16120515] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 12/12/2018] [Accepted: 12/14/2018] [Indexed: 02/06/2023] Open
Abstract
We found previously that white adipose tissue (WAT) hyperplasia in obese mice was limited by dietary omega-3 polyunsaturated fatty acids (omega-3 PUFA). Here we aimed to characterize the underlying mechanism. C57BL/6N mice were fed a high-fat diet supplemented or not with omega-3 PUFA for one week or eight weeks; mice fed a standard chow diet were also used. In epididymal WAT (eWAT), DNA content was quantified, immunohistochemical analysis was used to reveal the size of adipocytes and macrophage content, and lipidomic analysis and a gene expression screen were performed to assess inflammatory status. The stromal-vascular fraction of eWAT, which contained most of the eWAT cells, except for adipocytes, was characterized using flow cytometry. Omega-3 PUFA supplementation limited the high-fat diet-induced increase in eWAT weight, cell number (DNA content), inflammation, and adipocyte growth. eWAT hyperplasia was compromised due to the limited increase in the number of preadipocytes and a decrease in the number of endothelial cells. The number of leukocytes and macrophages was unaffected, but a shift in macrophage polarization towards a less inflammatory phenotype was observed. Our results document that the counteraction of eWAT hyperplasia by omega-3 PUFA in dietary-obese mice reflects an effect on the number of adipose lineage and endothelial cells.
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Role of Nutrition in Alcoholic Liver Disease: Summary of the Symposium at the ESBRA 2017 Congress. Biomolecules 2018; 8:biom8020016. [PMID: 29587455 PMCID: PMC6022870 DOI: 10.3390/biom8020016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 03/20/2018] [Accepted: 03/20/2018] [Indexed: 02/06/2023] Open
Abstract
The symposium, “Role of Nutrition in Alcoholic Liver Disease”, was held at the European Society for Biomedical Research on Alcoholism Congress on 9 October 2017 in Crete, Greece. The goal of the symposium was to highlight recent advances and developments in the field of alcohol and nutrition. The symposium was focused on experimental and clinical aspects in relation to the role of different types of dietary nutrients and malnutrition in the pathogenesis of alcoholic liver disease (ALD). The following is a summary of key research presented at this session. The speakers discussed the role of dietary fats and carbohydrates in the development and progression of alcohol-induced multi-organ pathology in animal models of ALD, analyzed novel nutrition-related therapeutics (specifically, betaine and zinc) in the treatment of ALD, and addressed clinical relevance of malnutrition and nutrition support in ALD. This summary of the symposium will benefit junior and senior faculty currently investigating alcohol-induced organ pathology as well as undergraduate, graduate, and post-graduate students and fellows.
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Kain V, Ingle KA, Kabarowski J, Barnes S, Limdi NA, Prabhu SD, Halade GV. Genetic deletion of 12/15 lipoxygenase promotes effective resolution of inflammation following myocardial infarction. J Mol Cell Cardiol 2018. [PMID: 29526491 DOI: 10.1016/j.yjmcc.2018.03.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
12/15 lipoxygenase (LOX) directs inflammation and lipid remodeling. However, the role of 12/15LOX in post-myocardial infarction (MI) left ventricular remodeling is unclear. To determine the role of 12/15LOX, 8-12 week-old C57BL/6 J wild-type (WT; n = 93) and 12/15LOX-/- (n = 97) mice were subjected to permanent coronary artery ligation and monitored at day (d)1 and d5 post-operatively. Post-MI d28 survival was measured in male and female mice. No-MI surgery mice were maintained as d0 naïve controls. 12/15LOX-/- mice exhibited higher survival rates with lower cardiac rupture and improved LV function as compared with WT post-MI. Compared to WT, neutrophils and macrophages in 12/15LOX-/- mice were polarized towards N2 and M2 phenotypes, respectively, with increased of expression mrc-1, ym-1, and arg-1 post-MI. 12/15LOX-/- mice exhibited lower levels of pro-inflammatory 12-(S)-hydroperoxyeicosatetraenoic acid (12(S)-HETE) and higher CYP2J-derived epoxyeicosatrienoic acids (EETs) levels. CYP2J-derived 5,6-, 8,9-, 11,12-, and 14,15-EETs activated macrophage-specific hemeoxygenase (HO)-1 marked with increases in F4/80+/Ly6Clow and F4/80+/CD206high cells at d5 post-MI in 12/15LOX-/- mice. In contrast, inhibition of HO-1 led to total mortality in 12/15LOX-/- mice by post-MI d5. 12/15LOX-/- mice exhibited reduced collagen density and lower α-smooth muscle actin (SMA) expression at d5 post-MI, indicating delayed or limited fibroblast-to-myofibroblast differentiation. In conclusion, genetic deletion of 12/15LOX reduces 12(S)-HETE and activates CYP2J-derived EETs to promote effective resolution of inflammation post-MI leading to reduced cardiac rupture, improved LV function, and better survival.
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Affiliation(s)
- Vasundhara Kain
- Division of Cardiovascular Disease, Department of Medicine, The University of Alabama at Birmingham, AL, USA
| | - Kevin A Ingle
- Division of Cardiovascular Disease, Department of Medicine, The University of Alabama at Birmingham, AL, USA
| | - Janusz Kabarowski
- Department of Microbiology, The University of Alabama at Birmingham, AL, USA
| | - Stephen Barnes
- Targeted Metabolomics and Proteomics Laboratory, Department of Pharmacology and Toxicology, The University of Alabama at Birmingham, AL, USA
| | - Nita A Limdi
- Department of Neurology, The University of Alabama at Birmingham, AL, USA
| | - Sumanth D Prabhu
- Division of Cardiovascular Disease, Department of Medicine, The University of Alabama at Birmingham, AL, USA
| | - Ganesh V Halade
- Division of Cardiovascular Disease, Department of Medicine, The University of Alabama at Birmingham, AL, USA.
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Warner DR, Liu H, Miller ME, Ramsden CE, Gao B, Feldstein AE, Schuster S, McClain CJ, Kirpich IA. Dietary Linoleic Acid and Its Oxidized Metabolites Exacerbate Liver Injury Caused by Ethanol via Induction of Hepatic Proinflammatory Response in Mice. THE AMERICAN JOURNAL OF PATHOLOGY 2017; 187:2232-2245. [PMID: 28923202 DOI: 10.1016/j.ajpath.2017.06.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 06/18/2017] [Accepted: 06/22/2017] [Indexed: 01/22/2023]
Abstract
Alcoholic liver disease is a major human health problem leading to significant morbidity and mortality in the United States and worldwide. Dietary fat plays an important role in alcoholic liver disease pathogenesis. Herein, we tested the hypothesis that a combination of ethanol and a diet rich in linoleic acid (LA) leads to the increased production of oxidized LA metabolites (OXLAMs), specifically 9- and 13-hydroxyoctadecadienoic acids (HODEs), which contribute to a hepatic proinflammatory response exacerbating liver injury. Mice were fed unsaturated (with a high LA content) or saturated fat diets (USF and SF, respectively) with or without ethanol for 10 days, followed by a single binge of ethanol. Compared to SF+ethanol, mice fed USF+ethanol had elevated plasma alanine transaminase levels, enhanced hepatic steatosis, oxidative stress, and inflammation. Plasma and liver levels of 9- and 13-HODEs were increased in response to USF+ethanol feeding. We demonstrated that primarily 9-HODE, but not 13-HODE, induced the expression of several proinflammatory cytokines in vitro in RAW264.7 macrophages. Finally, deficiency of arachidonate 15-lipoxygenase, a major enzyme involved in LA oxidation and OXLAM production, attenuated liver injury and inflammation caused by USF+ethanol feeding but had no effect on hepatic steatosis. This study demonstrates that OXLAM-mediated induction of a proinflammatory response in macrophages is one of the potential mechanisms underlying the progression from alcohol-induced steatosis to alcoholic steatohepatitis.
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Affiliation(s)
- Dennis R Warner
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville School of Medicine, Louisville, Kentucky
| | - Huilin Liu
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville School of Medicine, Louisville, Kentucky; College of Life Science, Jilin University, Changchun, China
| | - Matthew E Miller
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville School of Medicine, Louisville, Kentucky
| | - Christopher E Ramsden
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, Maryland; National Institute on Aging, Baltimore, Maryland
| | - Bin Gao
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, Maryland
| | - Ariel E Feldstein
- Division of Gastroenterology, Department of Pediatrics, University of California San Diego, San Diego, California
| | - Susanne Schuster
- Division of Gastroenterology, Department of Pediatrics, University of California San Diego, San Diego, California
| | - Craig J McClain
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville School of Medicine, Louisville, Kentucky; Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, Kentucky; Robley Rex Veterans Medical Center, Louisville, Kentucky; Hepatobiology and Toxicology Program, University of Louisville School of Medicine, Louisville, Kentucky; University of Louisville Alcohol Research Center, University of Louisville School of Medicine, Louisville, Kentucky
| | - Irina A Kirpich
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville School of Medicine, Louisville, Kentucky; Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, Kentucky; Hepatobiology and Toxicology Program, University of Louisville School of Medicine, Louisville, Kentucky; University of Louisville Alcohol Research Center, University of Louisville School of Medicine, Louisville, Kentucky.
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Salimi V, Ramezani A, Mirzaei H, Tahamtan A, Faghihloo E, Rezaei F, Naseri M, Bont L, Mokhtari-Azad T, Tavakoli-Yaraki M. Evaluation of the expression level of 12/15 lipoxygenase and the related inflammatory factors (CCL5, CCL3) in respiratory syncytial virus infection in mice model. Microb Pathog 2017; 109:209-213. [DOI: 10.1016/j.micpath.2017.05.045] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 05/24/2017] [Accepted: 05/30/2017] [Indexed: 10/19/2022]
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Abstract
Experimental Lyme arthritis provides a mouse model for exploring the development of pathology following infection of C3H mice with Borrelia burgdorferi. Infected mice develop a reliable inflammatory arthritis of the ankle joint with severity that typically peaks around two to three weeks post-infection and then undergoes spontaneous resolution. This makes experimental Lyme arthritis an excellent model for investigating the mechanisms that drive both the development and resolution phases of inflammatory disease. Eicosanoids are powerful lipid mediators of inflammation and are known to regulate multiple aspects of inflammatory processes. While much is known about the role of eicosanoids in regulating immune responses during autoimmune disease and cancer, relatively little is known about their role during bacterial infection. In this review, we discuss the role of eicosanoid biosynthetic pathways in mediating inflammatory responses during bacterial infection using experimental Lyme arthritis as a model system. We point out the critical role eicosanoids play in disease development and highlight surprising differences between sterile autoimmune responses and those occurring in response to bacterial infection. These differences should be kept in mind when designing therapies and treatments for inflammatory diseases.
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Affiliation(s)
- Charles R Brown
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA.
| | - Edward A Dennis
- Departments of Chemistry/Biochemistry and Pharmacology, University of California, San Diego, La Jolla, CA 92093, USA.
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Nguyen CH, Stadler S, Brenner S, Huttary N, Krieger S, Jäger W, Dolznig H, Krupitza G. Cancer cell-derived 12(S)-HETE signals via 12-HETE receptor, RHO, ROCK and MLC2 to induce lymph endothelial barrier breaching. Br J Cancer 2016; 115:364-70. [PMID: 27362730 PMCID: PMC4973159 DOI: 10.1038/bjc.2016.201] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 05/30/2016] [Accepted: 06/02/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The arachidonic acid metabolite 12(S)-HETE is suspected to enhance metastatic spread by inducing cancer cell- and lymph endothelial cell (LEC) motility. However, the molecular mechanisms leading to 12(S)-HETE-triggered cell migration are still elusive. METHODS To delineate the signalling pathways involved in 12(S)-HETE-mediated migration, inhibitors against RHO and ROCK, and specific siRNAs downregulating 12(S)-HETE receptor (12-HETER) and myosin light chain 2 (MLC2) were used. The breaching of the endothelial barrier was investigated by an assay measuring tumour spheroid-triggered 'circular chemorepellent-induced defects' (CCIDs), and respective signal transduction was elucidated by western blotting. RESULTS We provide evidence that 12(S)-HETE phosphorylated (and activated) MLC2, which regulates actin/myosin-based contraction. MLC2 activation was found to be essential for LEC retraction and CCID formation. Furthermore, we show that 12(S)-HETE activated a 12-HETER-RHO-ROCK-MYPT signalling cascade to induce MLC2 function. CONCLUSIONS Signalling via this pathway is described for this metabolite for the first time. This may provide potential targets for the intervention of metastatic colonisation.
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Affiliation(s)
- Chi Huu Nguyen
- Department for Clinical Pharmacy and Diagnostics, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Serena Stadler
- Clinical Institute of Pathology, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
| | - Stefan Brenner
- Department for Clinical Pharmacy and Diagnostics, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Nicole Huttary
- Clinical Institute of Pathology, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
| | - Sigurd Krieger
- Clinical Institute of Pathology, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
| | - Walter Jäger
- Department for Clinical Pharmacy and Diagnostics, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Helmut Dolznig
- Institute of Medical Genetics, Medical University of Vienna, Waehringer Strasse 10, A-1090 Vienna, Austria
| | - Georg Krupitza
- Clinical Institute of Pathology, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
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Kayama Y, Raaz U, Jagger A, Adam M, Schellinger IN, Sakamoto M, Suzuki H, Toyama K, Spin JM, Tsao PS. Diabetic Cardiovascular Disease Induced by Oxidative Stress. Int J Mol Sci 2015; 16:25234-63. [PMID: 26512646 PMCID: PMC4632800 DOI: 10.3390/ijms161025234] [Citation(s) in RCA: 264] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 09/30/2015] [Accepted: 09/30/2015] [Indexed: 01/10/2023] Open
Abstract
Cardiovascular disease (CVD) is the leading cause of morbidity and mortality among patients with diabetes mellitus (DM). DM can lead to multiple cardiovascular complications, including coronary artery disease (CAD), cardiac hypertrophy, and heart failure (HF). HF represents one of the most common causes of death in patients with DM and results from DM-induced CAD and diabetic cardiomyopathy. Oxidative stress is closely associated with the pathogenesis of DM and results from overproduction of reactive oxygen species (ROS). ROS overproduction is associated with hyperglycemia and metabolic disorders, such as impaired antioxidant function in conjunction with impaired antioxidant activity. Long-term exposure to oxidative stress in DM induces chronic inflammation and fibrosis in a range of tissues, leading to formation and progression of disease states in these tissues. Indeed, markers for oxidative stress are overexpressed in patients with DM, suggesting that increased ROS may be primarily responsible for the development of diabetic complications. Therefore, an understanding of the pathophysiological mechanisms mediated by oxidative stress is crucial to the prevention and treatment of diabetes-induced CVD. The current review focuses on the relationship between diabetes-induced CVD and oxidative stress, while highlighting the latest insights into this relationship from findings on diabetic heart and vascular disease.
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Affiliation(s)
- Yosuke Kayama
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Uwe Raaz
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Ann Jagger
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Matti Adam
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Isabel N Schellinger
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Masaya Sakamoto
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-Shinbashi, Minatoku, Tokyo 105-0003, Japan.
| | - Hirofumi Suzuki
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-Shinbashi, Minatoku, Tokyo 105-0003, Japan.
| | - Kensuke Toyama
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Joshua M Spin
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
| | - Philip S Tsao
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.
- VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
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Regulation of the development of asthmatic inflammation by in situ CD4(+)Foxp3 (+) T cells in a mouse model of late allergic asthma. Inflammation 2015; 37:1642-53. [PMID: 24854160 DOI: 10.1007/s10753-014-9892-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
CD4(+)Foxp3(+)T cells (Tregs) mediate homeostatic peripheral tolerance by suppressing helper T2 cells in allergy. However, the regulation of asthmatic inflammation by local (in situ) Tregs in asthma remains unclear. BALB/c mice sensitized and challenged with ovalbumin (OVA) (asthma group) developed asthmatic inflammation with eosinophils and lymphocytes, but not mast cells. The number of Tregs in the circulation, pulmonary lymph nodes (pLNs), and thymi significantly decreased in the asthma group compared to the control group without OVA sensitization and challenge in the effector phase. The development of asthmatic inflammation is inversely related to decreased Tregs with reduced mRNA expression such as interleukin (IL)-4, transforming growth factor-β1, and IL-10, but not interferon-γ, in pLNs. Moreover, M2 macrophages increased in the local site. The present study suggests that Tregs, at least in part, may regulate the development of asthmatic inflammation by cell-cell contact and regional cytokine productions.
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Wang AW, Song L, Miao J, Wang HX, Tian C, Jiang X, Han QY, Yu L, Liu Y, Du J, Xia YL, Li HH. Baicalein attenuates angiotensin II-induced cardiac remodeling via inhibition of AKT/mTOR, ERK1/2, NF-κB, and calcineurin signaling pathways in mice. Am J Hypertens 2015; 28:518-26. [PMID: 25362112 DOI: 10.1093/ajh/hpu194] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Baicalein, a specific lipoxygenase (LOX) inhibitor, has anti-inflammatory and antioxidant effects. However, the functional role of baicalein in angiotensin II (Ang II)-induced hypertension and cardiac remodeling remains unclear. Here we investigated the effect of baicalein on cardiac hypertrophy and fibrosis and the underlying mechanism. METHODS Wild-type (WT) mice were injected with Ang II (1,200ng/kg/min) alone or together with 12/15-LOX inhibitor baicalein (25mg/kg) for 14 days. Histological examinations were performed on heart sections with hematoxylin and eosin, Masson's trichrome, wheat germ agglutinin staining, and immunohistochemistry. The messenger RNA (mRNA) expression of cytokines and protein levels were detected by real-time polymerase chain reaction (PCR) and western blot analysis respectively. RESULTS Ang II infusion significantly increased blood pressure but decreased cardiac contractile function reflected by fractional shortening% and ejection fraction% compared with saline-treated mice. Moreover, Ang II infusion resulted in marked cardiac hypertrophy and fibrosis, promoted accumulation of macrophages and T cells, the expression of proinflammatory cytokines and malondialdehyde (MDA) production. However, these actions were markedly reversed by administration of baicalein in mice. Mechanistically, the protective effects of baicalein were associated with the inhibition of inflammation, oxidative stress, and multiple signaling pathways (AKT/mTOR, ERK1/2, nuclear factor-κB (NF-κB), and calcineurin) in the Ang II-treated mice. CONCLUSIONS This study demonstrates that baicalein can significantly ameliorate Ang II-induced hypertension and cardiac remodeling, and may be a novel therapeutic drug for prevention of hypertensive heart diseases.
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Affiliation(s)
- Ai-Wu Wang
- Department of Pharmacy, Provincial Hospital Affiliated to Shandong University, Ji-nan, China; #These authors contributed equally to this work
| | - Lina Song
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Beijing, China; #These authors contributed equally to this work
| | - Jie Miao
- Department of Pharmacy, School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Changqing University Science & Technology Park, Ji-nan, China
| | - Hong-Xia Wang
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Cui Tian
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xue Jiang
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Qiu-Yue Han
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Liqing Yu
- Department of Animal and Avian Sciences, University of Maryland, College Park, Maryland, USA
| | - Ying Liu
- Department of Cardiology, Institute of Cardiovascular Diseases, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Jie Du
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Yun-Long Xia
- Department of Cardiology, Institute of Cardiovascular Diseases, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Hui-Hua Li
- Department of Cardiology, Institute of Cardiovascular Diseases, First Affiliated Hospital of Dalian Medical University, Dalian, China; Center for Prevention and Control of Non-communicable Chronic Diseases, School of Public Health, Dalian Medical University, Dalian, China.
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Lipid mediators are critical in resolving inflammation: a review of the emerging roles of eicosanoids in diabetes mellitus. BIOMED RESEARCH INTERNATIONAL 2015; 2015:568408. [PMID: 25866794 PMCID: PMC4383369 DOI: 10.1155/2015/568408] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Revised: 10/27/2014] [Accepted: 10/27/2014] [Indexed: 12/25/2022]
Abstract
The biosynthesis pathway of eicosanoids derived from arachidonic acid, such as prostaglandins and leukotrienes, relates to the pathophysiology of diabetes mellitus (DM). A better understanding of how lipid mediators modulate the inflammatory process may help recognize key factors underlying the progression of diabetes complications. Our review presents recent knowledge about eicosanoid synthesis and signaling in DM-related complications, and discusses eicosanoid-related target therapeutics.
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29
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Song L, Yang H, Wang HX, Tian C, Liu Y, Zeng XJ, Gao E, Kang YM, Du J, Li HH. Inhibition of 12/15 lipoxygenase by baicalein reduces myocardial ischemia/reperfusion injury via modulation of multiple signaling pathways. Apoptosis 2015; 19:567-80. [PMID: 24248985 DOI: 10.1007/s10495-013-0946-z] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
12/15-Lipoxygenase (LOX) is a member of the LOX family that catalyzes the step from arachidonic acid to hydroxy-eicosatetraenoic acids (HETEs). Previous studies demonstrated that 12/15-LOX plays a critical role in the development of atherosclerosis, hypertension, heart failure, and other diseases; however, its role in myocardial ischemic injury was contraversal. Here, we investigated the inhibition of 12/15-LOX by baicalein on acute cardiac injury and dissected its molecular mechanism. In a mouse model of acute ischemia/reperfusion (I/R) injury, 12/15-LOX was significantly upregulated in the peri-infarct area surrounding the primary infarction. In cultured cardiac myocytes, baicalein suppressed apoptosis and caspase 3 activity in response to simulated ischemia/reperfusion (I/R). Moreover, administration of 12/15-LOX inhibitor, baicalein, significantly attenuated myocardial infarct size induced by I/R injury. Moreover, baicalein treatment significantly inhibited cardiomyocyte apoptosis, inflammatory responses and oxidative stress in the heart after I/R injury. The mechanisms underlying these effects were associated with the activation of ERK1/2 and AKT pathways and inhibition of activation of p38 MAPK, JNK1/2, and NF-kB/p65 pathways in the I/R-treated hearts and neonatal cardiomyoctes. Our data indicated that 12/15-LOX inhibitor baicalein can prevent myocardial I/R injury by modulation of multiple mechanisms, and suggest that baicalein could represent a novel therapeutic drug for acute myocardial infarction.
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Affiliation(s)
- Lina Song
- Department of Pathology, Physiology and Pathophysiology, Beijing AnZhen Hospital the Key Laboratory of Remodeling-Related Cardiovascular Diseases, School of Basic Medical Sciences, Capital Medical University, Ministry of Education, No. 10 Xitoutiao You An Men, Beijing, 100069, China
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30
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Abstract
ALOX12 is a gene encoding arachidonate 12-lipoxygenase (12-LOX), a member of a nonheme lipoxygenase family of dioxygenases. ALOX12 catalyzes the addition of oxygen to arachidonic acid, producing 12-hydroperoxyeicosatetraenoic acid (12-HPETE), which can be reduced to the eicosanoid 12-HETE (12-hydroxyeicosatetraenoic acid). 12-HETE acts in diverse cellular processes, including catecholamine synthesis, vasoconstriction, neuronal function, and inflammation. Consistent with effects on these fundamental mechanisms, allelic variants of ALOX12 are associated with diseases including schizophrenia, atherosclerosis, and cancers, but the mechanisms have not been defined. Toxoplasma gondii is an apicomplexan parasite that causes morbidity and mortality and stimulates an innate and adaptive immune inflammatory reaction. Recently, it has been shown that a gene region known as Toxo1 is critical for susceptibility or resistance to T. gondii infection in rats. An orthologous gene region with ALOX12 centromeric is also present in humans. Here we report that the human ALOX12 gene has susceptibility alleles for human congenital toxoplasmosis (rs6502997 [P, <0.000309], rs312462 [P, <0.028499], rs6502998 [P, <0.029794], and rs434473 [P, <0.038516]). A human monocytic cell line was genetically engineered using lentivirus RNA interference to knock down ALOX12. In ALOX12 knockdown cells, ALOX12 RNA expression decreased and levels of the ALOX12 substrate, arachidonic acid, increased. ALOX12 knockdown attenuated the progression of T. gondii infection and resulted in greater parasite burdens but decreased consequent late cell death of the human monocytic cell line. These findings suggest that ALOX12 influences host responses to T. gondii infection in human cells. ALOX12 has been shown in other studies to be important in numerous diseases. Here we demonstrate the critical role ALOX12 plays in T. gondii infection in humans.
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31
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Bhattacharya A, Hamilton R, Jernigan A, Zhang Y, Sabia M, Rahman MM, Li Y, Wei R, Chaudhuri A, Van Remmen H. Genetic ablation of 12/15-lipoxygenase but not 5-lipoxygenase protects against denervation-induced muscle atrophy. Free Radic Biol Med 2014; 67:30-40. [PMID: 24121057 DOI: 10.1016/j.freeradbiomed.2013.10.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 08/30/2013] [Accepted: 10/01/2013] [Indexed: 12/15/2022]
Abstract
Skeletal muscle atrophy is a debilitating outcome of a number of chronic diseases and conditions associated with loss of muscle innervation by motor neurons, such as aging and neurodegenerative diseases. We previously reported that denervation-induced loss of muscle mass is associated with activation of cytosolic phospholipase A2 (cPLA2), the rate-limiting step for the release of arachidonic acid from membrane phospholipids, which then acts as a substrate for metabolic pathways that generate bioactive lipid mediators. In this study, we asked whether 5- and 12/15-lipoxygenase (LO) lipid metabolic pathways downstream of cPLA2 mediate denervation-induced muscle atrophy in mice. Both 5- and 12/15-LO were activated in response to surgical denervation; however, 12/15-LO activity was increased ~2.5-fold versus an ~1.5-fold increase in activity of 5-LO. Genetic and pharmacological inhibition of 12/15-LO (but not 5-LO) significantly protected against denervation-induced muscle atrophy, suggesting a selective role for the 12/15-LO pathway in neurogenic muscle atrophy. The activation of the 12/15-LO pathway (but not 5-LO) during muscle atrophy increased NADPH oxidase activity, protein ubiquitination, and ubiquitin-proteasome-mediated proteolytic degradation. In conclusion, this study reveals a novel pathway for neurogenic muscle atrophy and suggests that 12/15-LO may be a potential therapeutic target in diseases associated with loss of innervation and muscle atrophy.
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Affiliation(s)
- Arunabh Bhattacharya
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA.
| | - Ryan Hamilton
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA
| | - Amanda Jernigan
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA
| | - Yiqiang Zhang
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA; Department of Physiology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Marian Sabia
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA
| | - Md M Rahman
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA; Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Yan Li
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA
| | - Rochelle Wei
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA
| | - Asish Chaudhuri
- Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA; Department of Biochemistry, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; Geriatric Research Education and Clinical Center, South Texas Veterans Health Care System, San Antonio, TX 78229, USA
| | - Holly Van Remmen
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; Sam and Ann Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA; Department of Physiology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; Geriatric Research Education and Clinical Center, South Texas Veterans Health Care System, San Antonio, TX 78229, USA
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Koenig O, Walker T, Perle N, Zech A, Neumann B, Schlensak C, Wendel HP, Nolte A. New aspects of gene-silencing for the treatment of cardiovascular diseases. Pharmaceuticals (Basel) 2013; 6:881-914. [PMID: 24276320 PMCID: PMC3816708 DOI: 10.3390/ph6070881] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 06/15/2013] [Accepted: 07/11/2013] [Indexed: 01/17/2023] Open
Abstract
Coronary heart disease (CHD), mainly caused by atherosclerosis, represents the single leading cause of death in industrialized countries. Besides the classical interventional therapies new applications for treatment of vascular wall pathologies are appearing on the horizon. RNA interference (RNAi) represents a novel therapeutic strategy due to sequence-specific gene-silencing through the use of small interfering RNA (siRNA). The modulation of gene expression by short RNAs provides a powerful tool to theoretically silence any disease-related or disease-promoting gene of interest. In this review we outline the RNAi mechanisms, the currently used delivery systems and their possible applications to the cardiovascular system. Especially, the optimization of the targeting and transfection procedures could enhance the efficiency of siRNA delivery drastically and might open the way to clinical applicability. The new findings of the last years may show the techniques to new innovative therapies and could probably play an important role in treating CHD in the future.
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Affiliation(s)
- Olivia Koenig
- Clinical Research Laboratory, Dept. of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Calwerstr. 7/1, 72076 Tuebingen, Germany.
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Polimeni M, Valente E, Aldieri E, Khadjavi A, Giribaldi G, Prato M. Role of 15-hydroxyeicosatetraenoic acid in hemozoin-induced lysozyme release from human adherent monocytes. Biofactors 2013; 39:304-14. [PMID: 23355332 DOI: 10.1002/biof.1071] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 11/02/2012] [Indexed: 11/09/2022]
Abstract
Natural hemozoin (nHZ), a lipid-bound ferriprotoporphyrin IX crystal produced by Plasmodium parasites after hemoglobin catabolism, seriously compromises the functions of human monocytes, and 15-hydroxyeicosatetraenoic acid (15-HETE) and 4-hydroxynonenal (4-HNE), two nHZ lipoperoxidation products, have been related to such a functional impairment. nHZ was recently shown to promote inflammation-mediated lysozyme release from human monocytes through p38 mitogen-activated protein kinase- (MAPK)- and nuclear factor (NF)-κB-dependent mechanisms. This study aimed at identifying the molecule of nHZ lipid moiety that was responsible for these effects. Results showed that 15-HETE mimicked nHZ effects on lysozyme release, whereas 4-HNE did not. 15-HETE-enhanced lysozyme release was abrogated by anti-TNF-α and anti-IL-1β-blocking antibodies and mimicked by recombinant cytokines; on the contrary, MIP-1α/CCL3 was not involved as a soluble mediator of 15-HETE effects. Moreover, 15-HETE early activated p38 MAPK and NF-κB pathways by inducing p38 MAPK phosphorylation; cytosolic I-κBα phosphorylation and degradation; NF-κB nuclear translocation and DNA-binding. Inhibition of both routes through chemical inhibitors (SB203580, quercetin, artemisinin, and parthenolide) prevented 15-HETE-dependent lysozyme release. Collectively, these data suggest that 15-HETE plays a major role in nHZ-enhanced monocyte degranulation.
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Affiliation(s)
- Manuela Polimeni
- Dipartimento di Genetica, Biologia e Biochimica, Facoltà di Medicina e Chirurgia, Università degli studi di Torino, Torino, Italy
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Green-Mitchell SM, Tersey SA, Cole BK, Ma K, Kuhn NS, Cunningham TD, Maybee NA, Chakrabarti SK, McDuffie M, Taylor-Fishwick DA, Mirmira RG, Nadler JL, Morris MA. Deletion of 12/15-lipoxygenase alters macrophage and islet function in NOD-Alox15(null) mice, leading to protection against type 1 diabetes development. PLoS One 2013; 8:e56763. [PMID: 23437231 PMCID: PMC3578926 DOI: 10.1371/journal.pone.0056763] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 01/16/2013] [Indexed: 11/19/2022] Open
Abstract
AIMS Type 1 diabetes (T1D) is characterized by autoimmune depletion of insulin-producing pancreatic beta cells. We showed previously that deletion of the 12/15-lipoxygenase enzyme (12/15-LO, Alox15 gene) in NOD mice leads to nearly 100 percent protection from T1D. In this study, we test the hypothesis that cytokines involved in the IL-12/12/15-LO axis affect both macrophage and islet function, which contributes to the development of T1D. METHODS 12/15-LO expression was clarified in immune cells by qRT-PCR, and timing of expression was tested in islets using qRT-PCR and Western blotting. Expression of key proinflammatory cytokines and pancreatic transcription factors was studied in NOD and NOD-Alox15(null) macrophages and islets using qRT-PCR. The two mouse strains were also assessed for the ability of splenocytes to transfer diabetes in an adoptive transfer model, and beta cell mass. RESULTS 12/15-LO is expressed in macrophages, but not B and T cells of NOD mice. In macrophages, 12/15-LO deletion leads to decreased proinflammatory cytokine mRNA and protein levels. Furthermore, splenocytes from NOD-Alox15(null) mice are unable to transfer diabetes in an adoptive transfer model. In islets, expression of 12/15-LO in NOD mice peaks at a crucial time during insulitis development. The absence of 12/15-LO results in maintenance of islet health with respect to measurements of islet-specific transcription factors, markers of islet health, proinflammatory cytokines, and beta cell mass. CONCLUSIONS These results suggest that 12/15-LO affects islet and macrophage function, causing inflammation, and leading to autoimmunity and reduced beta cell mass.
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Affiliation(s)
- Shamina M. Green-Mitchell
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Sarah A. Tersey
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Banumathi K. Cole
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Kaiwen Ma
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Norine S. Kuhn
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Tina Duong Cunningham
- Graduate Program in Public Health, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Nelly A. Maybee
- Department of Medicine, University of Virginia, Charlottesville, Virginia, United States of America
| | - Swarup K. Chakrabarti
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Marcia McDuffie
- Department of Microbiology, University of Virginia, Charlottesville, Virginia, United States of America
- Department of Medicine, University of Virginia, Charlottesville, Virginia, United States of America
| | - David A. Taylor-Fishwick
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Raghavendra G. Mirmira
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Jerry L. Nadler
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
- Department of Medicine, University of Virginia, Charlottesville, Virginia, United States of America
| | - Margaret A. Morris
- Department of Internal Medicine, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
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Othman A, Ahmad S, Megyerdi S, Mussell R, Choksi K, Maddipati KR, Elmarakby A, Rizk N, Al-Shabrawey M. 12/15-Lipoxygenase-derived lipid metabolites induce retinal endothelial cell barrier dysfunction: contribution of NADPH oxidase. PLoS One 2013; 8:e57254. [PMID: 23437353 PMCID: PMC3577708 DOI: 10.1371/journal.pone.0057254] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 01/18/2013] [Indexed: 01/08/2023] Open
Abstract
The purpose of the current study was to evaluate the effect of 12/15- lipoxygenase (12/15-LOX) metabolites on retinal endothelial cell (REC) barrier function. FITC-dextran flux across the REC monolayers and electrical cell-substrate impedance sensing (ECIS) were used to evaluate the effect of 12- and 15-hydroxyeicosatetreanoic acids (HETE) on REC permeability and transcellular electrical resistance (TER). Effect of 12- or 15-HETE on the levels of zonula occludens protein 1 (ZO-1), reactive oxygen species (ROS), NOX2, pVEGF-R2 and pSHP1 was examined in the presence or absence of inhibitors of NADPH oxidase. In vivo studies were performed using Ins2Akita mice treated with or without the 12/15-LOX inhibitor baicalein. Levels of HETE and inflammatory mediators were examined by LC/MS and Multiplex Immunoassay respectively. ROS generation and NOX2 expression were also measured in mice retinas. 12- and 15- HETE significantly increased permeability and reduced TER and ZO-1expression in REC. VEGF-R2 inhibitor reduced the permeability effect of 12-HETE. Treatment of REC with HETE also increased ROS generation and expression of NOX2 and pVEGF-R2 and decreased pSHP1 expression. Treatment of diabetic mice with baicalein significantly decreased retinal HETE, ICAM-1, VCAM-1, IL-6, ROS generation, and NOX2 expression. Baicalein also reduced pVEGF-R2 while restored pSHP1 levels in diabetic retina. Our findings suggest that 12/15-LOX contributes to vascular hyperpermeability during DR via NADPH oxidase dependent mechanism which involves suppression of protein tyrosine phosphatase and activation of VEGF-R2 signal pathway.
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Affiliation(s)
- Amira Othman
- Department of Oral Biology/Anatomy, College of Dental Medicine, Georgia Regents University (GRU), Augusta, Georgia, United States of America
- Department of Anatomy, Mansoura University, Mansoura, Egypt
| | - Saif Ahmad
- Department of Ophthalmology and Vision Discovery Institute, Medical College of Georgia, Georgia Regents University (GRU), Augusta, Georgia, United States of America
| | - Sylvia Megyerdi
- Department of Oral Biology/Anatomy, College of Dental Medicine, Georgia Regents University (GRU), Augusta, Georgia, United States of America
| | - Rene Mussell
- Department of Oral Biology/Anatomy, College of Dental Medicine, Georgia Regents University (GRU), Augusta, Georgia, United States of America
| | - Karishma Choksi
- Department of Oral Biology/Anatomy, College of Dental Medicine, Georgia Regents University (GRU), Augusta, Georgia, United States of America
| | - Krishna Rao Maddipati
- Department of Pathology, Wayne States University, Detroit, Michigan, United States of America
| | - Ahmed Elmarakby
- Department of Oral Biology/Anatomy, College of Dental Medicine, Georgia Regents University (GRU), Augusta, Georgia, United States of America
- Vascular Biology Center, Medical College of Georgia, Georgia Regents University (GRU), Augusta, Georgia, United States of America
| | - Nasser Rizk
- Department of Health Sciences, College of Science, Qatar University, Doha, Qatar
| | - Mohamed Al-Shabrawey
- Department of Oral Biology/Anatomy, College of Dental Medicine, Georgia Regents University (GRU), Augusta, Georgia, United States of America
- Department of Anatomy, Mansoura University, Mansoura, Egypt
- Department of Ophthalmology and Vision Discovery Institute, Medical College of Georgia, Georgia Regents University (GRU), Augusta, Georgia, United States of America
- Vascular Biology Center, Medical College of Georgia, Georgia Regents University (GRU), Augusta, Georgia, United States of America
- * E-mail:
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The effects of polyphenols on oxidative stress and the arachidonic acid cascade. Implications for the prevention/treatment of high prevalence diseases. Biochem Pharmacol 2012; 84:1113-22. [DOI: 10.1016/j.bcp.2012.07.017] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 07/17/2012] [Accepted: 07/17/2012] [Indexed: 11/22/2022]
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Zasłona Z, Peters-Golden M. A lipid mediator controls neutrophil recruitment in acute lung injury--should we really be surprised? CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2012; 16:161. [PMID: 23102473 PMCID: PMC3682262 DOI: 10.1186/cc11519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
New therapeutic approaches are sorely needed for acute lung injury. Neutrophil recruitment is a pathological hallmark of this syndrome, and is mainly regulated by CXC chemokine receptor 2 and its ligand CXC ligand 1. Rossaint and colleagues have described a new mechanism for regulation of this axis by 12/15-lipoxygenase products. This work opens the door for new therapeutic approaches and highlights the crucial interplay between lipid mediators and chemokines, a time-honored but often-ignored concept.
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Hayashi T, Shimoyama N, Mizuno T. Destruction of salivary and lacrimal glands by Th1-polarized reaction in a model of secondary Sjögren's syndrome in lupus-prone female NZB × NZWF(1) mice. Inflammation 2012; 35:638-46. [PMID: 21786007 DOI: 10.1007/s10753-011-9356-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
T helper (Th)1/Th2 balance determines the direction of some kinds of autoimmune diseases. The involvement of acini areas by CD4(+) helper T(Th) cell subset in submandibular and lacrimal glands are largely unknown in secondary Sjögren's syndrome (sSjS) with systemic lupus erythematosus (SLE). Submandibular and lacrimal glands were examined immunopathologically in lupus-prone female NZB × NZW(B/W)F(1) mice, model for human sSjS with SLE. Dacryoadenitis and sialoadenitis with renal failure developed with age. Infiltration of lymphoid cells (lymphocytes and plasma cells) expanded from the periductal areas in striated ducts to the acini, and the isolated foci in the acini were observed in those organs. The destruction of duct and acini epithelium, including the myoepithelium, was induced by interferon (IFN)-γ(+) and IgG2a(+) lymphoid cells, but not by interleukin(IL)-4(+), IL-5(+), IL-13(+), and IgG1(+) lymphoid cells. Compared with IL-5 and IL-13, high values of IFN-γ were produced systemically at various ages. Also local expression of IFN-γ mRNA was higher than that of IL-4 mRNA. The result suggests that the acini destruction in submandibular and lacrimal glands may be induced by systemic and local Th1 cell dominant reactions in lupus-prone B/WF(1) mice with sSjS.
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Affiliation(s)
- Toshiharu Hayashi
- Laboratory of Veterinary Pathology, Faculty of Agriculture, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan.
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Sanders WG, Morisseau C, Hammock BD, Cheung AK, Terry CM. Soluble epoxide hydrolase expression in a porcine model of arteriovenous graft stenosis and anti-inflammatory effects of a soluble epoxide hydrolase inhibitor. Am J Physiol Cell Physiol 2012; 303:C278-90. [PMID: 22621785 PMCID: PMC3423029 DOI: 10.1152/ajpcell.00386.2011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 05/21/2012] [Indexed: 01/09/2023]
Abstract
Synthetic arteriovenous (AV) grafts, placed between an artery and vein, are used for hemodialysis but often fail due to stenosis, typically at the vein-graft anastomosis. This study recorded T lymphocyte and macrophage accumulation at the vein-graft anastomosis, suggesting a role for inflammation in stenosis development. Epoxyeicosatrienoic acids (EETs), products of cytochrome P-450 epoxidation of arachidonic acid, have vasculoprotective and anti-inflammatory effects including inhibition of platelet activation, cell migration, and adhesion. EETs are hydrolyzed by soluble epoxide hydrolase (sEH) to less active diols. The effects of a specific inhibitor of sEH (sEHI) on cytokine release from human monocytes and mouse bone marrow-derived macrophages (BMMΦ) from wild-type (WT) and sEH knockout (KO) animals were investigated. Expression of sEH protein increased over time at the anastomosis as evaluated by immunohistochemistry. Pre-exposure of adherent human monocytes to sEHI (5 μM) significantly inhibited lipopolysaccharide-induced release of monocyte chemotactic protein-1 (MCP-1) and tumor necrosis factor-α and enhanced the EET-to-diol ratio. Release of MCP-1 from WT BMMΦ was significantly inhibited but release from sEH KO BMMΦ was not attenuated indicating the specificity of the sEHI. In contrast, sEHI did not inhibit the release of macrophage inflammatory protein-1 or interleukin-6. Nuclear translocation of NF-κB, as assessed by immunocytochemical staining, was not decreased with sEHI in monocytes, but the phosphorylation of JNK was completely abrogated, suggesting this pathway is the target of sEHI effects in monocytes. These results suggest that sEHI may be useful for inhibition of inflammation and subsequently stenosis in AV grafts.
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Affiliation(s)
- William G Sanders
- Department of Pharmaceutics, University of Utah, Salt Lake City, Utah 84112, USA
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Weaver JR, Holman TR, Imai Y, Jadhav A, Kenyon V, Maloney DJ, Nadler JL, Rai G, Simeonov A, Taylor-Fishwick DA. Integration of pro-inflammatory cytokines, 12-lipoxygenase and NOX-1 in pancreatic islet beta cell dysfunction. Mol Cell Endocrinol 2012; 358:88-95. [PMID: 22502743 DOI: 10.1016/j.mce.2012.03.004] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2012] [Accepted: 03/08/2012] [Indexed: 01/28/2023]
Abstract
Elevated cellular reactive species, which can be produced by diabetic serum conditions such as elevated inflammatory cytokines, lipotoxicity or glucotoxicity contribute to islet beta cell dysfunction and cell death. Cellular pathways that result in beta cell oxidative stress are poorly resolved. In this study, stimulation of human donor islets, primary mouse islets or homogeneous beta cell lines with a cocktail of inflammatory cytokines (TNFα, IL-1β, and INFγ) significantly induced NADPH oxidase-1 (NOX-1) gene expression (p<0.05). This pro-inflammatory cytokine cocktail concomitantly induced loss of islet glucose stimulated insulin response (p<0.05), elevated expression of MCP-1 (p<0.01), increased cellular reactive oxygen species (ROS) and induced cell death. Inhibitors of NADPH oxidase, apocynin and diphenyleneiodonium, and a dual selective NOX1/4 inhibitor, blocked ROS generation (p<0.01) and induction of MCP-1 (p<0.05) by pro-inflammatory cytokines in beta cells. It has previously been reported that pro-inflammatory cytokine stimulation induces 12-lipoxygenase (12-LO) expression in human islets. 12-Hydroxyeicosatetraenoic acid (12-HETE), a product of 12-LO activity, stimulated NOX-1 expression in human islets (p<0.05). A novel selective inhibitor of 12-LO blocked induction of NOX-1, production of ROS and pro-caspase 3 cleavage by pro-inflammatory cytokines in INS-1 beta cells (p<0.01). Inhibition was not seen with a structurally related but inactive analog. Importantly, islets from human type 2 diabetic donors have an elevated expression of NOX-1 (p<0.05). This study describes an integrated pathway in beta cells that links beta cell dysfunction induced by pro-inflammatory cytokines with 12-lipoxygenase and NADPH oxidase (NOX-1) activation. Inhibitors of this pathway may provide a new therapeutic strategy to preserve beta cell mass in diabetes.
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Affiliation(s)
- Jessica R Weaver
- Strelitz Diabetes Center, Eastern Virginia Medical School, Norfolk, VA 23501, United States
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Ma K, Jin X, Liang X, Zhao Q, Zhang X. Inflammatory mediators involved in the progression of the metabolic syndrome. Diabetes Metab Res Rev 2012; 28:388-94. [PMID: 22389088 DOI: 10.1002/dmrr.2291] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The metabolic syndrome is often associated with type 2 diabetes mellitus, dyslipidemia, atherosclerosis, hypertension, steatosis of the liver and other organs, as well as hypertension, type 2 diabetes mellitus, and atherosclerosis. Recent studies have implicated a number of inflammatory mediators including cytokines, adipokines and eicosanoids in the inflammatory responses that accompany the metabolic syndrome. Measurements of the circulating levels of the inflammatory molecules that accompany this syndrome might provide leads to therapeutic approaches to modulate the inflammatory responses and thereby alter disease progression. In this review, we summarize recent studies on classical and newer inflammatory mediators in the pathogenesis of the metabolic syndrome in humans and experimental models.
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Affiliation(s)
- Kuifen Ma
- The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.
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Capra V, Bäck M, Barbieri SS, Camera M, Tremoli E, Rovati GE. Eicosanoids and Their Drugs in Cardiovascular Diseases: Focus on Atherosclerosis and Stroke. Med Res Rev 2012; 33:364-438. [DOI: 10.1002/med.21251] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Valérie Capra
- Department of Pharmacological Sciences; University of Milan; Via Balzaretti 9 20133 Milan Italy
| | - Magnus Bäck
- Department of Cardiology and Center for Molecular Medicine; Karolinska University Hospital; Stockholm Sweden
| | | | - Marina Camera
- Department of Pharmacological Sciences; University of Milan; Via Balzaretti 9 20133 Milan Italy
- Centro Cardiologico Monzino; I.R.C.C.S Milan Italy
| | - Elena Tremoli
- Department of Pharmacological Sciences; University of Milan; Via Balzaretti 9 20133 Milan Italy
- Centro Cardiologico Monzino; I.R.C.C.S Milan Italy
| | - G. Enrico Rovati
- Department of Pharmacological Sciences; University of Milan; Via Balzaretti 9 20133 Milan Italy
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Contribution of cytochrome P450 1B1 to hypertension and associated pathophysiology: a novel target for antihypertensive agents. Prostaglandins Other Lipid Mediat 2011; 98:69-74. [PMID: 22210049 DOI: 10.1016/j.prostaglandins.2011.12.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 11/18/2011] [Accepted: 12/12/2011] [Indexed: 12/24/2022]
Abstract
The aim of this review is to discuss the contribution of cytochrome P450 (CYP) 1B1 in vascular smooth muscle cell growth, hypertension, and associated pathophysiology. CYP1B1 is expressed in cardiovascular and renal tissues, and mediates angiotensin II (Ang II)-induced activation of NADPH oxidase and generation of reactive oxygen species (ROS), and vascular smooth muscle cell migration, proliferation, and hypertrophy. Moreover, CYP1B1 contributes to the development and/or maintenance of hypertension produced by Ang II-, deoxycorticosterone (DOCA)-salt-, and N(ω)-nitro-L-arginine methyl ester-induced hypertension and in spontaneously hypertensive rats. The pathophysiological changes, including cardiovascular hypertrophy, increased vascular reactivity, endothelial and renal dysfunction, injury and inflammation associated with Ang II- and/or DOCA-salt induced hypertension in rats, and Ang II-induced hypertension in mice are minimized by inhibition of CYP1B1 activity with 2,4,3',5'-tetramethoxystilbene or by Cyp1b1 gene disruption in mice. These pathophysiological changes appear to be mediated by increased production of ROS via CYP1B1-dependent NADPH oxidase activity and extracellular signal-regulated kinase 1/2, p38 mitogen-activated protein kinase, and c-Src.
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Jennings BL, Anderson LJ, Estes AM, Yaghini FA, Fang XR, Porter J, Gonzalez FJ, Campbell WB, Malik KU. Cytochrome P450 1B1 contributes to renal dysfunction and damage caused by angiotensin II in mice. Hypertension 2011; 59:348-54. [PMID: 22184325 DOI: 10.1161/hypertensionaha.111.183301] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cytochrome P450 1B1 contributes to the development of angiotensin II-induced hypertension and associated cardiovascular pathophysiology. In view of the critical role of angiotensin II in the kidney, as well as in salt and water homeostasis, and blood pressure regulation, we determined the contribution of cytochrome P450 1B1 to renal dysfunction and injury associated with angiotensin II-induced hypertension in male Cyp1b1(+/+) and Cyp1b1(-/-) mice. Angiotensin II infusion (700 ng/kg per minute) given by miniosmotic pumps for 13 and 28 days increased systolic blood pressure in Cyp1b1(+/+) mice; this increase was significantly reduced in Cyp1b1(-/-) mice. Angiotensin II increased renal Cyp1b1 activity, vascular resistance, and reactivity to vasoconstrictor agents and caused endothelial dysfunction in Cyp1b1(+/+) but not Cyp1b1(-/-) mice. Angiotensin II increased water consumption and urine output, decreased urine osmolality, increased urinary Na(+) and K(+) excretion, and caused proteinuria and albuminuria in Cyp1b1(+/+) mice that was diminished in Cyp1b1(-/-) mice. Infusion of angiotensin II for 28 but not 13 days caused renal fibrosis, tubular damage, and inflammation in Cyp1b1(+/+) mice, which was minimized in Cyp1b1(-/-) mice. Angiotensin II increased levels of 12- and 20-hydroxyeicosatetraenoic acids; reactive oxygen species; and activity of NADPH oxidase, extracellular signal-regulated kinase 1/2, p38 mitogen-activated protein kinase, and c-Src in the kidneys of Cyp1b1(+/+) but not Cyp1b1(-/-) mice. These data suggest that increased thirst, renal dysfunction, and injury and inflammation associated with angiotensin II-induced hypertension in mice depend on cytochrome P450 1B1 activity, thus indicating that cytochrome P450 1B1 could serve as a novel target for treating renal disease and hypertension.
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Affiliation(s)
- Brett L Jennings
- Department of Pharmacology, College of Medicine, 874 Union Ave, University of Tennessee Health Science Center, Memphis, TN 38163, USA
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Luo P, Wang MH. Eicosanoids, β-cell function, and diabetes. Prostaglandins Other Lipid Mediat 2011; 95:1-10. [PMID: 21757024 DOI: 10.1016/j.prostaglandins.2011.06.001] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 06/01/2011] [Indexed: 10/18/2022]
Abstract
Arachidonic acid (AA) is metabolized by cyclooxygenase (COX), lipoxygenase (LOX), and cytochrome P450 (CYP) enzymes into eicosanoids, which are involved in diverse diseases, including type 1 and type 2 diabetes. During the last 30 years, evidence has been accumulated that suggests important functions for eicosanoids in the control of pancreatic β-cell function and destruction. AA metabolites of the COX pathway, especially prostaglandin E(2) (PGE(2)), appear to be significant factors to β-cell dysfunction and destruction, participating in the pathogenesis of diabetes and its complications. Several elegant studies have contributed to the sorting out of the importance of 12-LOX eicosanoids in cytokine-mediated inflammation in pancreatic β cells. The role of CYP eicosanoids in diabetes is yet to be explored. A recent publication has demonstrated that stabilizing the levels of epoxyeicosatrienoic acids (EETs), CYP eicosanoids, by inhibiting or deleting soluble epoxide hydrolase (sEH) improves β-cell function and reduces β-cell apoptosis in diabetes. In this review we summarize recent findings implicating these eicosanoid pathways in diabetes and its complications. We also discuss the development of animal models with targeted gene deletion and specific enzymatic inhibitors in each pathway to identify potential targets for the treatment of diabetes and its complications.
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Affiliation(s)
- Pengcheng Luo
- Department of Nephrology, Renmin Hospital of Wuhan University, China
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Cohen G, Riahi Y, Sasson S. Lipid peroxidation of poly-unsaturated fatty acids in normal and obese adipose tissues. Arch Physiol Biochem 2011; 117:131-9. [PMID: 21395403 DOI: 10.3109/13813455.2011.557387] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Adipose tissues function as the primary storage compartment of fatty acids and as an endocrine organ that affects peripheral tissues. Many of adipose tissue-derived factors, often termed adipokines, have been discovered in recent years. The synthesis and secretion of these factors vary in different depots of adipose tissues. Excessive lipid accumulation in adipocytes induces inflammatory processes by up-regulating the expression and release of pro-inflammatory cytokines. In addition, activated macrophages in the obese adipose tissue release inflammatory cytokines. Adipose tissue inflammation has also been linked to an enhanced metabolism of polyunsaturated fatty acids (PUFAs). The non-enzymatic peroxidation of PUFAs and of their 12/15-lipoxygenase-derived hydroperoxy metabolites leads to the generation of the reactive aldehyde species 4-hydroxyalkenals. This review shows that 4-hydroxyalkenals, in particular 4-hydroxynonenal, play a key role in lipid storage homeostasis in normal adipocytes. Nonetheless, in the obese adipose tissue an increased production of 4-hydroxyalkenals contributes to the inflamed phenotype.
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Affiliation(s)
- G Cohen
- Institute for Drug Research, Department of Pharmacology, School of Pharmacy, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
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Al-Shabrawey M, Mussell R, Kahook K, Tawfik A, Eladl M, Sarthy V, Nussbaum J, El-Marakby A, Park SY, Gurel Z, Sheibani N, Maddipati KR. Increased expression and activity of 12-lipoxygenase in oxygen-induced ischemic retinopathy and proliferative diabetic retinopathy: implications in retinal neovascularization. Diabetes 2011; 60:614-24. [PMID: 21228311 PMCID: PMC3028363 DOI: 10.2337/db10-0008] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE Arachidonic acid is metabolized by 12-lipoxygenase (12-LOX) to 12-hydroxyeicosatetraenoic acid (12-HETE) and has an important role in the regulation of angiogenesis and endothelial cell proliferation and migration. The goal of this study was to investigate whether 12-LOX plays a role in retinal neovascularization (NV). RESEARCH DESIGN AND METHODS Experiments were performed using retinas from a murine model of oxygen-induced ischemic retinopathy (OIR) that was treated with and without the LOX pathway inhibitor, baicalein, or lacking 12-LOX. We also analyzed vitreous samples from patients with and without proliferative diabetic retinopathy (PDR). Western blotting and RT-PCR were used to assess the expression of 12-LOX, vascular endothelial growth factor (VEGF), and pigment epithelium-derived factor (PEDF). Liquid chromatography-mass spectrometry was used to assess the amounts of HETEs in the murine retina and human vitreous samples. The effects of 12-HETE on VEGF and PEDF expression were evaluated in Müller cells (rMCs), primary mouse retinal pigment epithelial cells, and astrocytes. RESULTS Retinal NV during OIR was associated with increased 12-LOX expression and 12-, 15-, and 5-HETE production. The amounts of HETEs also were significantly higher in the vitreous of diabetic patients with PDR. Retinal NV was markedly abrogated in mice treated with baicalein or mice lacking 12-LOX. This was associated with decreased VEGF expression and restoration of PEDF levels. PEDF expression was reduced in 12-HETE-treated rMCs, astrocytes, and the retinal pigment epithelium. Only rMCs and astrocytes showed increased VEGF expression by 12-HETE. CONCLUSIONS 12-LOX and its product HETE are important regulators of retinal NV through modulation of VEGF and PEDF expression and could provide a new therapeutic target to prevent and treat ischemic retinopathy.
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Affiliation(s)
- Mohamed Al-Shabrawey
- Department of Oral Biology and Anatomy, Medical College of Georgia, Augusta, Georgia, USA.
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Dobrian AD, Lieb DC, Ma Q, Lindsay JW, Cole BK, Ma K, Chakrabarti SK, Kuhn NS, Wohlgemuth SD, Fontana M, Nadler JL. Differential expression and localization of 12/15 lipoxygenases in adipose tissue in human obese subjects. Biochem Biophys Res Commun 2010; 403:485-90. [PMID: 21094135 DOI: 10.1016/j.bbrc.2010.11.065] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 11/15/2010] [Indexed: 01/04/2023]
Abstract
Adipose tissue inflammation in obesity is a major factor leading to cardiovascular disease and type 2 diabetes.12/15 lipoxygenases (ALOX) play an important role in the generation of inflammatory mediators, insulin resistance and downstream immune activation in animal models of obesity. However, the expression and roles of 12/15ALOX isoforms, and their cellular sources in human subcutaneous (sc) and omental (om) fat in obesity is unknown. The objective of this study was to examine the gene expression and localization of ALOX isoforms and relevant downstream cytokines in subcutaneous (sc) and omental (om) adipose tissue in obese humans. Paired biopsies of sc and om fat were obtained during bariatric surgeries from 24 morbidly obese patients. Gene and protein expression for ALOX15a, ALOX15b and ALOX 12 were measured by real-time PCR and western blotting in adipocytes and stromal vascular fractions (SVF) from om and sc adipose tissue along with the mRNA expression of the downstream cytokines IL-12a, IL-12b, IL-6, IFNγ and the chemokine CXCL10. In a paired analysis, all ALOX isoforms, IL-6, IL-12a and CXCL10 were significantly higher in om vs. sc fat. ALOX15a mRNA and protein expression was found exclusively in om fat. All of the ALOX isoforms were expressed solely in the SVF. Further fractionation of the SVF in CD34+ and CD34- cells indicated that ALOX15a is predominantly expressed in the CD34+ fraction including vascular and progenitor cells, while ALOX15B is mostly expressed in the CD34- cells containing various leucocytes and myeloid cells. This result was confirmed by immunohistochemistry showing exclusive localization of ALOX15a in the om fat and predominantly in the vasculature and non-adipocyte cells. Our finding is identifying selective expression of ALOX15a in human om but not sc fat. This is a study showing a major inflammatory gene exclusively expressed in visceral fat in humans.
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Affiliation(s)
- Anca D Dobrian
- Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507, USA.
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Jiang S, Chen H, Wang Z, Riethoven JJ, Xia Y, Miner J, Fromm M. Activated AMPK and prostaglandins are involved in the response to conjugated linoleic acid and are sufficient to cause lipid reductions in adipocytes. J Nutr Biochem 2010; 22:656-64. [PMID: 20965713 DOI: 10.1016/j.jnutbio.2010.05.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 12/18/2009] [Accepted: 05/20/2010] [Indexed: 11/20/2022]
Abstract
trans-10, cis-12 Conjugated linoleic acid (t10c12 CLA) reduces triglyceride levels in adipocytes. AMP-activated protein kinase (AMPK) and inflammation were recently demonstrated to be involved in the emerging pathways regulating this response. This study further investigated the role of AMPK and inflammation by testing the following hypotheses: (1) a moderate activation of AMPK and an inflammatory response are sufficient to reduce triglycerides, and (2) strong activation of AMPK is also sufficient. Experiments were performed by adding compounds that affect these pathways and by measuring their effects in 3T3-L1 adipocytes. A comparison of four AMPK activators (metformin, phenformin, TNF-α and t10c12 CLA) found a correlation between AMPK activity and triglyceride reduction. This correlation appeared to be modulated by the level of cyclo-oxygenase (COX)-2 mRNA produced. Inhibitors of the prostaglandin (PG) biosynthetic pathway interfered with t10c12 CLA's ability to reduce triglycerides. A combination of metformin and PGH2, or phenformin alone, efficiently reduced triglyceride levels in adipocytes. Microarray analysis indicated that the transcriptional responses to phenformin or t10c12 CLA were very similar, suggesting similar pathways were activated. 3T3-L1 fibroblasts were found to weakly induce the integrated stress response (ISR) in response to phenformin or t10c12 CLA and to respond robustly as they differentiated into adipocytes. This indicated that both chemicals required adipocytes at the same stage of differentiation to be competent for this response. These results support the above hypotheses and suggest compounds that moderately activate AMPK and increase PG levels or robustly activate AMPK in adipocytes may be beneficial for reducing adiposity.
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Affiliation(s)
- Shan Jiang
- Department of Animal Science, University of Nebraska, Lincoln, NE 68588-0665, USA
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Imaizumi S, Grijalva V, Priceman S, Wu L, Su F, Farias-Eisner R, Hama S, Navab M, Fogelman AM, Reddy ST. Mitogen-activated protein kinase phosphatase-1 deficiency decreases atherosclerosis in apolipoprotein E null mice by reducing monocyte chemoattractant protein-1 levels. Mol Genet Metab 2010; 101:66-75. [PMID: 20619710 PMCID: PMC3037189 DOI: 10.1016/j.ymgme.2010.05.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Accepted: 05/20/2010] [Indexed: 12/22/2022]
Abstract
RATIONALE We previously reported that mitogen-activated protein kinase phosphatase-1 (MKP-1) expression is necessary for oxidized phospholipids to induce monocyte chemoattractant protein-1 (MCP-1) secretion by human aortic endothelial cells. We also reported that inhibition of tyrosine phosphatases including MKP-1 ameliorated atherosclerotic lesions in mouse models of atherosclerosis. OBJECTIVE This study was conducted to further investigate the specific role of MKP-1 in atherogenesis. METHODS AND RESULTS We generated MKP-1(-/-)/apoE(-/-) double-knockout mice. At 24weeks of age, the size, macrophage and dendritic cell content of atherosclerotic lesions of the aortic root were significantly lower ( approximately -41% for lesions and macrophages, and approximately -78% for dendritic cells) in MKP-1(-/-)/apoE(-/-) mice when compared with apoE(-/-) mice. Total cholesterol (-18.4%, p=0.045) and very low-density lipoprotein (VLDL)/low-density lipoprotein (LDL) cholesterol (-20.0%, p=0.052) levels were decreased in MKP-1(-/-)/apoE(-/-) mice. Serum from MKP-1(-/-)/apoE(-/-) mice contained significantly lower levels of MCP-1 and possessed significantly reduced capability to induce monocyte migration in vitro. Moreover, peritoneal macrophages isolated from MKP-1(-/-)/apoE(-/-) mice produced significantly lower levels of MCP-1 when compared to peritoneal macrophages from apoE(-/-) mice. Furthermore, MKP-1(-/-)/apoE(-/-) mice had significantly reduced serum hydroxyeicosatetraenoic acids (HETEs) levels, which have been reported to induce MCP-1 levels. CONCLUSIONS Our results demonstrate that MKP-1 deficiency significantly decreases atherosclerotic lesion development in mice, in part, by affecting MCP-1 levels in the circulation and MCP-1 production by macrophages. MKP-1 may serve as a potential therapeutic target for the treatment of atherosclerotic disease.
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Affiliation(s)
- Satoshi Imaizumi
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Victor Grijalva
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Saul Priceman
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Lily Wu
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Feng Su
- Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Robin Farias-Eisner
- Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Susan Hama
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Mohamad Navab
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Alan M. Fogelman
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
| | - Srinivasa T. Reddy
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
- Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California Los Angeles, CA 90095-1679, USA
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