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Kowatsch MM, Winter T, Oyugi J, Kimani J, Lajoie J, Aukema HM, Fowke KR. Acetylsalicylic acid inhibition of the lipoxygenase pathway: Implications for HIV prevention. Prostaglandins Other Lipid Mediat 2024; 174:106878. [PMID: 39084323 DOI: 10.1016/j.prostaglandins.2024.106878] [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: 12/11/2023] [Revised: 07/09/2024] [Accepted: 07/26/2024] [Indexed: 08/02/2024]
Abstract
BACKGROUND 1.5 million new HIV infections occurred in 2021, suggesting new prevention methods are needed. Inflammation increases the risk for HIV acquisition by attracting HIV target cells to the female genital tract (FGT). In a pilot study, acetylsalicylic acid (ASA/Aspirin) decreased the proportion of FGT HIV target cells by 35 %. However, the mechanism remains unknown. METHODS Women from Nairobi, Kenya took low-dose ASA (81 mg) daily for 6-weeks. Free oxylipins in the plasma were quantified by high-performance liquid chromatography-tandem mass spectroscopy. RESULTS Oxylipins from 9 fatty acid substrates were detected, with more than one analyte from 4 substrates reduced post-ASA. Summary analysis found ASA downregulated cyclooxygenase and lipoxygenase but not cytochrome P450 activity with a lower n-6/n-3 oxylipin profile, reflecting reduced inflammation post-ASA. CONCLUSIONS Inflammation is associated with increased lipoxygenase activity and HIV risk. Our data suggests ASA reduces inflammation through downregulation of oxylipins. Understanding how ASA reduces inflammation may lead to novel HIV prevention approaches.
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Affiliation(s)
- Monika M Kowatsch
- Laboratory of Viral Immunology, Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada
| | - Tanja Winter
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada; Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB, Canada
| | - Julius Oyugi
- Laboratory of Viral Immunology, Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada; Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Joshua Kimani
- Laboratory of Viral Immunology, Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada; Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya; Partners for Health and Development in Africa, Nairobi, Kenya; University of Nairobi Institute for Tropical and Infectious Diseases, University of Nairobi. Nairobi, Kenya
| | - Julie Lajoie
- Laboratory of Viral Immunology, Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada; Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Harold M Aukema
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada; Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB, Canada
| | - Keith R Fowke
- Laboratory of Viral Immunology, Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada; Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya; Partners for Health and Development in Africa, Nairobi, Kenya; Department of Community Health Science, University of Manitoba, Winnipeg, MB, Canada.
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2
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Harju N, Hytti M, Kolari O, Nisula H, Loukovaara S, Kauppinen A. Anti-inflammatory potential of simvastatin and amfenac in ARPE-19 cells; insights in preventing re-detachment and proliferative vitreoretinopathy after rhegmatogenous retinal detachment surgery. Int Ophthalmol 2024; 44:158. [PMID: 38530532 DOI: 10.1007/s10792-024-03067-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 02/16/2024] [Indexed: 03/28/2024]
Abstract
PURPOSE Rhegmatogenous retinal detachment is a severe vision-threatening complication that can result into proliferative vitreoretinopathy (PVR) and re-detachment of the retina if recovery from surgery fails. Inflammation and changes in retinal pigment epithelial (RPE) cells are important contributors to the disease. Here, we studied the effects of simvastatin and amfenac on ARPE-19 cells under inflammatory conditions. METHODS ARPE-19 cells were pre-treated with simvastatin and/or amfenac for 24 h after which interleukin (IL)-1α or IL-1β was added for another 24 h. After treatments, lactate dehydrogenase release, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) processing, nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) activity, prostaglandin E2 (PGE2) level, and extracellular levels of IL-6, IL-8, monocytic chemoattractant protein (MCP-1), vascular endothelial growth factor (VEGF), and pigment epithelium-derived factor, as well as the production of reactive oxygen species (ROS) were determined. RESULTS Pre-treatment of human ARPE-19 cells with simvastatin reduced the production of IL-6, IL-8, and MCP-1 cytokines, PGE2 levels, as well as NF-κB activity upon inflammation, whereas amfenac reduced IL-8 and MCP-1 release but increased ROS production. Together, simvastatin and amfenac reduced the release of IL-6, IL-8, and MCP-1 cytokines as well as NF-κB activity but increased the VEGF release upon inflammation in ARPE-19 cells. CONCLUSION Our present study supports the anti-inflammatory capacity of simvastatin as pre-treatment against inflammation in human RPE cells, and the addition of amfenac complements the effect. The early modulation of local conditions in the retina can prevent inflammation induced PVR formation and subsequent retinal re-detachment.
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Affiliation(s)
- Niina Harju
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland.
- Head and Neck Center, Ophthalmology Research Unit, Helsinki University Central Hospital, Helsinki, Finland.
| | - Maria Hytti
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
- Department of Ophthalmology, School of Medicine, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Onni Kolari
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Hilkka Nisula
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Sirpa Loukovaara
- Department of Ophthalmology, Unit of Vitreoretinal Surgery, and Individualized Drug Therapy Research Program, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Anu Kauppinen
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland.
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Fessler SN, Chang Y, Liu L, Johnston CS. Curcumin Confers Anti-Inflammatory Effects in Adults Who Recovered from COVID-19 and Were Subsequently Vaccinated: A Randomized Controlled Trial. Nutrients 2023; 15:nu15071548. [PMID: 37049389 PMCID: PMC10096702 DOI: 10.3390/nu15071548] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/16/2023] [Accepted: 03/16/2023] [Indexed: 04/14/2023] Open
Abstract
COVID-19 infection and vaccination offer disparate levels of defense against reinfection and breakthrough infection. This study was designed to examine the effects of curcumin supplementation, specifically HydroCurc (CURC), versus placebo (CON) on circulating inflammatory biomarkers in adults who had previously been diagnosed with COVID-19 and subsequently received a primary series of monovalent vaccine doses. This study was conducted between June 2021 and May 2022. Participants were randomized to receive CURC (500 mg) or CON capsules twice daily for four weeks. Blood sampling was completed at baseline and week-4 and analyzed for biomarkers. Linear regression was utilized to examine the between-group differences in post-trial inflammatory biomarker levels, adjusting for baseline and covariates including age, sex, race/ethnicity, and interval between COVID-19 diagnosis and trial enrollment. The sample (n = 31) was 71% female (Age 27.6 ± 10.4 y). The CURC group exhibited significantly lower post-trial concentrations of proinflammatory IL-6 (β = -0.52, 95%CI: -1.03, -0.014, p = 0.046) and MCP-1 (β = -0.12, 95%CI: -0.23, -0.015, p = 0.027) compared to CON, adjusting for baseline and covariates. Curcumin intake confers anti-inflammatory activity and may be a promising prophylactic nutraceutical strategy for COVID-19. These results suggest that 4 weeks of curcumin supplementation resulted in significantly lower concentrations of proinflammatory cytokines in adults who recovered from COVID-19 infection and were subsequently vaccinated.
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Affiliation(s)
- Samantha N Fessler
- College of Health Solutions, Arizona State University, Phoenix, AZ 85004, USA
| | - Yung Chang
- Biodesign Institute, Arizona State University, Tempe, AZ 85281, USA
- School of Life Sciences, Arizona State University, Tempe, AZ 85281, USA
| | - Li Liu
- College of Health Solutions, Arizona State University, Phoenix, AZ 85004, USA
- Biodesign Institute, Arizona State University, Tempe, AZ 85281, USA
| | - Carol S Johnston
- College of Health Solutions, Arizona State University, Phoenix, AZ 85004, USA
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Adams R, Osborn G, Mukhia B, Laddach R, Willsmore Z, Chenoweth A, Geh JLC, MacKenzie Ross AD, Healy C, Barber L, Tsoka S, Sanz-Moreno V, Lacy KE, Karagiannis SN. Influencing tumor-associated macrophages in malignant melanoma with monoclonal antibodies. Oncoimmunology 2022; 11:2127284. [PMID: 36211808 PMCID: PMC9543025 DOI: 10.1080/2162402x.2022.2127284] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The application of monoclonal antibodies (mAbs) for the treatment of melanoma has significantly improved the clinical management of this malignancy over the last decade. Currently approved mAbs for melanoma enhance T cell effector immune responses by blocking immune checkpoint molecules PD-L1/PD-1 and CTLA-4. However, more than half of patients do not benefit from treatment. Targeting the prominent myeloid compartment within the tumor microenvironment, and in particular the ever-abundant tumor-associated macrophages (TAMs), may be a promising strategy to complement existing therapies and enhance treatment success. TAMs are a highly diverse and plastic subset of cells whose pro-tumor properties can support melanoma growth, angiogenesis and invasion. Understanding of their diversity, plasticity and multifaceted roles in cancer forms the basis for new promising TAM-centered treatment strategies. There are multiple mechanisms by which macrophages can be targeted with antibodies in a therapeutic setting, including by depletion, inhibition of specific pro-tumor properties, differential polarization to pro-inflammatory states and enhancement of antitumor immune functions. Here, we discuss TAMs in melanoma, their interactions with checkpoint inhibitor antibodies and emerging mAbs targeting different aspects of TAM biology and their potential to be translated to the clinic.
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Affiliation(s)
- Rebecca Adams
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK
| | - Gabriel Osborn
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK
| | - Bipashna Mukhia
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK
| | - Roman Laddach
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK,Department of Informatics, Faculty of Natural, Mathematical & Engineering Sciences, King’s College London, Bush House, London, UK
| | - Zena Willsmore
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK
| | - Alicia Chenoweth
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK,Breast Cancer Now Research Unit, School of Cancer & Pharmaceutical Sciences, King’s College London, Innovation Hub, Guy’s Hospital, London, UK
| | - Jenny L C Geh
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK,Department of Plastic Surgery at Guy’s, King’s, and St. Thomas’ Hospitals, London, UK
| | | | - Ciaran Healy
- Department of Plastic Surgery at Guy’s, King’s, and St. Thomas’ Hospitals, London, UK
| | - Linda Barber
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London, UK
| | - Sophia Tsoka
- Department of Informatics, Faculty of Natural, Mathematical & Engineering Sciences, King’s College London, Bush House, London, UK
| | | | - Katie E Lacy
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK
| | - Sophia N Karagiannis
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, London, UK,Breast Cancer Now Research Unit, School of Cancer & Pharmaceutical Sciences, King’s College London, Innovation Hub, Guy’s Hospital, London, UK,CONTACT Sophia N Karagiannis St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Guy’s Hospital, Tower Wing, 9th Floor, London, SE1 9RT, UK
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Pasichnyk O, Konoplitskyi V, Korobko Y, Nazarchuk O, Dmyrtriiev D, Babina Y. Determination of CCL2 / MCP-1 levels in the serum of children with melanocytic nevus in the postoperative period after using different methods of surgical treatment. ACTA BIO-MEDICA : ATENEI PARMENSIS 2022; 93:e2021464. [PMID: 35546011 PMCID: PMC9171853 DOI: 10.23750/abm.v93i2.12226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 09/14/2021] [Indexed: 11/18/2022]
Abstract
To date, there are many methods and ways to remove pigmented skin tumors, which have their own indications and contraindications for use, early or late complications.The aim of the study was to determine the level of CCL2 / MCP-1 in the serum of patients with melanocyte skin nevi in the postoperative period with different methods of their removal.Materials and methods of research. The study involved 60 children with melanocyte skin nevi of different localization, who were hospitalized in the pediatric surgery clinic in the period from 2018 to 2020. All patients were divided into 3 groups : I group - the excision of the formation took place with a scalpel, group II - excision of the formation was performed using a high-intensity surgical laser, group III - excision of the formation using a high-frequency electrosurgical device "BOWA-ARC 350.Results and discussion. The results of studies showed an increase in the level of CCL2 / MCP-1 in the plasma of patients of group I in 2,6 times 12 hours after surgery and 3,15 times in 24 hours after surgery. A similar dynamics of increase in the level of CCL2 / MCP-1 in plasma was observed in patients of group II, but was more pronounced. The largest increase in CCL2 / MCP-1 levels was in comparison group III.Conclusions. High levels of CCL2 / MCP-1 in the plasma of patients of groups II and III 12 and 24 hours after surgery convincingly indicate the presence of a pronounced inflammatory reaction under the influence of thermal damaging factor on skin tissues.
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Affiliation(s)
- Oleh Pasichnyk
- Department of children surgery , National Pirogov Memorial Medical University (Vinnytsya, Ukraine)
| | - Viktor Konoplitskyi
- Department of children surgery , National Pirogov Memorial Medical University (Vinnytsya, Ukraine)
| | - Yurii Korobko
- Department of children surgery , National Pirogov Memorial Medical University (Vinnytsya, Ukraine)
| | - Oleksandr Nazarchuk
- Department of Microbiology, National Pirogov Memorial Medical Universit ( Vinnytsya, Ukraine)
| | - Dmytro Dmyrtriiev
- Department of Anesthesiology, Intensive care and Emergency Medicine, National Pirogov Memorial Medical University ( Vinnytsya, Ukraine)
| | - Yuliana Babina
- Department of Anesthesiology, Intensive care and Emergency Medicine, National Pirogov Memorial Medical University ( Vinnytsya, Ukraine)
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Sun S, Wang K, Sun L, Cheng B, Qiao S, Dai H, Shi W, Ma J, Liu H. Therapeutic manipulation of gut microbiota by polysaccharides of Wolfiporia cocos reveals the contribution of the gut fungi-induced PGE 2 to alcoholic hepatic steatosis. Gut Microbes 2020; 12:1830693. [PMID: 33106075 PMCID: PMC7592601 DOI: 10.1080/19490976.2020.1830693] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Alcohol abuse and alcoholic liver diseases (ALD) have been worldwide spread. Chronic alcoholism-induced overgrowth of intestinal bacteria and fungi together with the enteric dysbiosis are important pathogenic mechanisms in ALD. We demonstrated that the water-insoluble polysaccharides (WIP) from Wolfporia cocos effectively ameliorated the hepatic inflammatory injury and fat accumulation through modulating gut microbiota in mice with alcoholic hepatic steatosis (AHS). Oral administration of WIP significantly enhanced the ratio of Firmictues to Proteobacteria, increased the abundance of Lachnospiraceae including Ruminoclostridum and unidentified_clostridials, and inhibited the ethanol-induced fungal overgrowth. Treatment with WIP activated the PPAR-γ signaling and reduced the inflammation in the colonic epithelia cell, facilitating a hypoxic state that suppresses the overgrowth of fungi and Proteobacteria in the gut. In addition, we found an overwhelming increase of the commensal fungus Meyerozyma guilliermondii in the feces of mice with AHS by culturing and ITS sequencing. Inoculation of M. guilliermondii into fungi-free mice aggravated the features of AHS. M. guilliermondii was found to generate PGE2 by biotransformation of arachidonic acid. Furthermore, the gut fungi (M. guilliermondii)-induced PGE2 production in the liver was confirmed as one of the mechanisms in the chronic AHS. The current study supports the manipulation of the gut microbiota (bacteria and fungi) as an effective and alternative strategy for alleviating ALD.
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Affiliation(s)
- Shanshan Sun
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China,School of Life Sciences, University of Science and Technology of China, Hefei, P. R. China
| | - Kai Wang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Li Sun
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, P. R. China
| | - Baosong Cheng
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, P. R. China
| | - Shanshan Qiao
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, P. R. China
| | - Huanqin Dai
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Wenyu Shi
- Microbial Resource and Big Data Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Juncai Ma
- Microbial Resource and Big Data Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Hongwei Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China,School of Life Sciences, University of Science and Technology of China, Hefei, P. R. China,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, P. R. China,CONTACT Hongwei Liu State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, NO.1 Beichen West Road, Chaoyang District, Beijing 100101, P. R. China
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Inazumi T, Yamada K, Shirata N, Sato H, Taketomi Y, Morita K, Hohjoh H, Tsuchiya S, Oniki K, Watanabe T, Sasaki Y, Oike Y, Ogata Y, Saruwatari J, Murakami M, Sugimoto Y. Prostaglandin E2-EP4 Axis Promotes Lipolysis and Fibrosis in Adipose Tissue Leading to Ectopic Fat Deposition and Insulin Resistance. Cell Rep 2020; 33:108265. [DOI: 10.1016/j.celrep.2020.108265] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 09/10/2020] [Accepted: 09/22/2020] [Indexed: 12/24/2022] Open
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Karimian MS, Pirro M, Majeed M, Sahebkar A. Curcumin as a natural regulator of monocyte chemoattractant protein-1. Cytokine Growth Factor Rev 2017; 33:55-63. [DOI: 10.1016/j.cytogfr.2016.10.001] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 10/06/2016] [Indexed: 12/26/2022]
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Curcumin inhibits monocyte chemoattractant protein-1 expression and enhances cholesterol efflux by suppressing the c-Jun N-terminal kinase pathway in macrophage. Inflamm Res 2014; 63:841-50. [DOI: 10.1007/s00011-014-0758-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Revised: 06/09/2014] [Accepted: 07/09/2014] [Indexed: 12/29/2022] Open
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10
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Casali CI, Weber K, Faggionato D, Gómez EM, Tome MCF. Coordinate regulation between the nuclear receptor peroxisome proliferator-activated receptor-γ and cyclooxygenase-2 in renal epithelial cells. Biochem Pharmacol 2014; 90:432-9. [PMID: 24915420 DOI: 10.1016/j.bcp.2014.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 06/02/2014] [Accepted: 06/02/2014] [Indexed: 01/24/2023]
Abstract
The peroxisome proliferator-activated receptors (PPARs) are ligand-dependent transcription factors involved in lipid metabolism and glucose utilization, in cell growth, differentiation and apoptosis, and in the regulation of pro-inflammatory genes expression such as cyclooxygenase-2 (COX-2). PPARγ is the main isoform in the renal inner medulla where it is believed to possess nephroprotective actions. In this kidney zone, COX-2 acts as an osmoprotective gene and its expression is modulated by changes in interstitial osmolarity. In the present work we evaluated whether hyperosmolar-induced COX-2 expression is modulated by PPARγ in renal epithelial cells MDCK subjected to high NaCl medium. The results presented herein show that ligand-activated PPARγ repressed COX-2 expression. But more important, the present findings show that hyperosmolar medium decreased PPARγ protein and increases the PPARγ phosphorylated form, which is inactive. ERK1/2 and p38 activation precedes PPARγ disappearance and induced-COX-2 expression. Therefore, the decrease in PPARγ expression is required for hyperosmotic induction of COX-2. We also found that PGE2, the main product of COX-2 in MDCK cells, induced these changes in PPARγ protein. Our results may alert on the long term use of thiazolidinediones (TZD) since they could affect renal medullary function that depends on COX-2 for cellular protection against osmotic stress.
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Affiliation(s)
- Cecilia I Casali
- Department of Biological Sciences, School of Pharmacy and Biochemistry, University of Buenos Aires Ciudad Autónoma de Buenos Aires C1113AAD, Argentina; IQUIFIB-CONICET, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Karen Weber
- Department of Biological Sciences, School of Pharmacy and Biochemistry, University of Buenos Aires Ciudad Autónoma de Buenos Aires C1113AAD, Argentina; IQUIFIB-CONICET, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Daniela Faggionato
- Department of Biological Sciences, School of Pharmacy and Biochemistry, University of Buenos Aires Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Emanuel Morel Gómez
- Department of Biological Sciences, School of Pharmacy and Biochemistry, University of Buenos Aires Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - María C Fernández Tome
- Department of Biological Sciences, School of Pharmacy and Biochemistry, University of Buenos Aires Ciudad Autónoma de Buenos Aires C1113AAD, Argentina; IQUIFIB-CONICET, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina.
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LIN XUEFENG, WU MIN, LIU BO, WANG JUNKUI, GUAN GONGCHANG, MA AIQUN, ZHANG YONG. Candesartan ameliorates acute myocardial infarction in rats through inducible nitric oxide synthase, nuclear factor-κB, monocyte chemoattractant protein-1, activator protein-1 and restoration of heat shock protein 72. Mol Med Rep 2012; 12:8193-200. [DOI: 10.3892/mmr.2015.4432] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 09/01/2015] [Indexed: 11/06/2022] Open
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