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Yang D, Liang H, Zhu X, Li B, Li C, Hu G, Du X, Dang G, Song Y, Ma X, Zhang P, Chen T, Liu B, Yan L, Pan CS, Sun K, Huo X, Feng Y, Wang X, Ai D, Han JY, Feng J. Farnesoid X Receptor Protects Murine Lung against IL-6-promoted Ferroptosis Induced by Polyriboinosinic-Polyribocytidylic Acid. Am J Respir Cell Mol Biol 2024; 70:364-378. [PMID: 38300138 DOI: 10.1165/rcmb.2023-0172oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Accepted: 01/31/2024] [Indexed: 02/02/2024] Open
Abstract
Various infections trigger a storm of proinflammatory cytokines in which IL-6 acts as a major contributor and leads to diffuse alveolar damage in patients. However, the metabolic regulatory mechanisms of IL-6 in lung injury remain unclear. Polyriboinosinic-polyribocytidylic acid [poly(I:C)] activates pattern recognition receptors involved in viral sensing and is widely used in alternative animal models of RNA virus-infected lung injury. In this study, intratracheal instillation of poly(I:C) with or without an IL-6-neutralizing antibody model was combined with metabonomics, transcriptomics, and so forth to explore the underlying molecular mechanisms of IL-6-exacerbated lung injury. We found that poly(I:C) increased the IL-6 concentration, and the upregulated IL-6 further induced lung ferroptosis, especially in alveolar epithelial type II cells. Meanwhile, lung regeneration was impaired. Mechanistically, metabolomic analysis showed that poly(I:C) significantly decreased glycolytic metabolites and increased bile acid intermediate metabolites that inhibited the bile acid nuclear receptor farnesoid X receptor (FXR), which could be reversed by IL-6-neutralizing antibody. In the ferroptosis microenvironment, IL-6 receptor monoclonal antibody tocilizumab increased FXR expression and subsequently increased the Yes-associated protein (YAP) concentration by enhancing PKM2 in A549 cells. FXR agonist GW4064 and liquiritin, a potential natural herbal ingredient as an FXR regulator, significantly attenuated lung tissue inflammation and ferroptosis while promoting pulmonary regeneration. Together, the findings of the present study provide the evidence that IL-6 promotes ferroptosis and impairs regeneration of alveolar epithelial type II cells during poly(I:C)-induced murine lung injury by regulating the FXR-PKM2-YAP axis. Targeting FXR represents a promising therapeutic strategy for IL-6-associated inflammatory lung injury.
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Affiliation(s)
- Dongmin Yang
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Hongbiao Liang
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Xiangrui Zhu
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Bochuan Li
- Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Chun Li
- Department of Rheumatology and Immunology, Peking University People's Hospital, Beijing, China; and
| | - Guizimeng Hu
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Xing Du
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Guohui Dang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Yuwei Song
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Xiaolong Ma
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Peng Zhang
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Tianqi Chen
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Bo Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Li Yan
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Chun-Shui Pan
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Kai Sun
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Xinmei Huo
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Yingmei Feng
- Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Xian Wang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Ding Ai
- Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China
| | - Jing-Yan Han
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
| | - Juan Feng
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, and
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Beijing, China
- Tasly Microcirculation Research Center, Peking University Health Science Center, Beijing, China
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Zhou Q, Liu Q, Wang Y, Chen J, Schmid O, Rehberg M, Yang L. Bridging Smart Nanosystems with Clinically Relevant Models and Advanced Imaging for Precision Drug Delivery. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2308659. [PMID: 38282076 PMCID: PMC11005737 DOI: 10.1002/advs.202308659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Indexed: 01/30/2024]
Abstract
Intracellular delivery of nano-drug-carriers (NDC) to specific cells, diseased regions, or solid tumors has entered the era of precision medicine that requires systematic knowledge of nano-biological interactions from multidisciplinary perspectives. To this end, this review first provides an overview of membrane-disruption methods such as electroporation, sonoporation, photoporation, microfluidic delivery, and microinjection with the merits of high-throughput and enhanced efficiency for in vitro NDC delivery. The impact of NDC characteristics including particle size, shape, charge, hydrophobicity, and elasticity on cellular uptake are elaborated and several types of NDC systems aiming for hierarchical targeting and delivery in vivo are reviewed. Emerging in vitro or ex vivo human/animal-derived pathophysiological models are further explored and highly recommended for use in NDC studies since they might mimic in vivo delivery features and fill the translational gaps from animals to humans. The exploration of modern microscopy techniques for precise nanoparticle (NP) tracking at the cellular, organ, and organismal levels informs the tailored development of NDCs for in vivo application and clinical translation. Overall, the review integrates the latest insights into smart nanosystem engineering, physiological models, imaging-based validation tools, all directed towards enhancing the precise and efficient intracellular delivery of NDCs.
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Affiliation(s)
- Qiaoxia Zhou
- Institute of Lung Health and Immunity (LHI), Helmholtz MunichComprehensive Pneumology Center (CPC‐M)Member of the German Center for Lung Research (DZL)85764MunichGermany
- Department of Forensic PathologyWest China School of Preclinical and Forensic MedicineSichuan UniversityNo. 17 Third Renmin Road NorthChengdu610041China
- Burning Rock BiotechBuilding 6, Phase 2, Standard Industrial Unit, No. 7 LuoXuan 4th Road, International Biotech IslandGuangzhou510300China
| | - Qiongliang Liu
- Institute of Lung Health and Immunity (LHI), Helmholtz MunichComprehensive Pneumology Center (CPC‐M)Member of the German Center for Lung Research (DZL)85764MunichGermany
- Department of Thoracic SurgeryShanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai200080China
| | - Yan Wang
- Qingdao Central HospitalUniversity of Health and Rehabilitation Sciences (Qingdao Central Medical Group)Qingdao266042China
| | - Jie Chen
- Department of Respiratory MedicineNational Key Clinical SpecialtyBranch of National Clinical Research Center for Respiratory DiseaseXiangya HospitalCentral South UniversityChangshaHunan410008China
- Center of Respiratory MedicineXiangya HospitalCentral South UniversityChangshaHunan410008China
- Clinical Research Center for Respiratory Diseases in Hunan ProvinceChangshaHunan410008China
- Hunan Engineering Research Center for Intelligent Diagnosis and Treatment of Respiratory DiseaseChangshaHunan410008China
- National Clinical Research Center for Geriatric DisordersXiangya HospitalChangshaHunan410008P. R. China
| | - Otmar Schmid
- Institute of Lung Health and Immunity (LHI), Helmholtz MunichComprehensive Pneumology Center (CPC‐M)Member of the German Center for Lung Research (DZL)85764MunichGermany
| | - Markus Rehberg
- Institute of Lung Health and Immunity (LHI), Helmholtz MunichComprehensive Pneumology Center (CPC‐M)Member of the German Center for Lung Research (DZL)85764MunichGermany
| | - Lin Yang
- Institute of Lung Health and Immunity (LHI), Helmholtz MunichComprehensive Pneumology Center (CPC‐M)Member of the German Center for Lung Research (DZL)85764MunichGermany
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Gu L, Wang W, Gu Y, Cao J, Wang C. Metabolomic Signatures Associated with Radiation-Induced Lung Injury by Correlating Lung Tissue to Plasma in a Rat Model. Metabolites 2023; 13:1020. [PMID: 37755300 PMCID: PMC10536118 DOI: 10.3390/metabo13091020] [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: 08/15/2023] [Revised: 09/07/2023] [Accepted: 09/14/2023] [Indexed: 09/28/2023] Open
Abstract
The lung has raised significant concerns because of its radiosensitivity. Radiation-induced lung injury (RILI) has a serious impact on the quality of patients' lives and limits the effect of radiotherapy on chest tumors. In clinical practice, effective drug intervention for RILI remains to be fully elucidated. Therefore, an in-depth understanding of the biological characteristics is essential to reveal the mechanisms underlying the complex biological processes and discover novel therapeutic targets in RILI. In this study, Wistar rats received 0, 10, 20 or 35 Gy whole-thorax irradiation (WTI). Lung and plasma samples were collected within 5 days post-irradiation. Then, these samples were processed using liquid chromatography-mass spectrometry (LC-MS). A panel of potential plasma metabolic markers was selected by correlation analysis between the lung tissue and plasma metabolic features, followed by the evaluation of radiation injury levels within 5 days following whole-thorax irradiation (WTI). In addition, the multiple metabolic dysregulations primarily involved amino acids, bile acids and lipid and fatty acid β-oxidation-related metabolites, implying disturbances in the urea cycle, intestinal flora metabolism and mitochondrial dysfunction. In particular, the accumulation of long-chain acylcarnitines (ACs) was observed as early as 2 d post-WTI by dynamic plasma metabolic data analysis. Our findings indicate that plasma metabolic markers have the potential for RILI assessment. These results reveal metabolic characteristics following WTI and provide new insights into therapeutic interventions for RILI.
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Affiliation(s)
| | | | | | - Jianping Cao
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, School for Radiological and Interdisciplinary Sciences (RAD-X), Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection, Suzhou Industrial Park Ren’ai Road 199, Suzhou 215123, China; (L.G.); (W.W.); (Y.G.)
| | - Chang Wang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, School for Radiological and Interdisciplinary Sciences (RAD-X), Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection, Suzhou Industrial Park Ren’ai Road 199, Suzhou 215123, China; (L.G.); (W.W.); (Y.G.)
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Yde J, Wu Q, Borg JF, Fenton RA, Moeller HB. A systems-level analysis of bile acids effects on rat colon epithelial cells. Am J Physiol Gastrointest Liver Physiol 2022; 322:G34-G48. [PMID: 34643455 DOI: 10.1152/ajpgi.00178.2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 10/08/2021] [Indexed: 01/31/2023]
Abstract
Bile acid diarrhea is a chronic condition caused by increased delivery of bile acids to the colon. The underlying mechanisms remain to be elucidated. To investigate genes involved in bile acid diarrhea, systems-level analyses were used on a rat bile acid diarrhea model. Twelve male Wistar Munich rats, housed in metabolic cages, were fed either control or bile acid-mixed (1% wt/wt) diets for 10 days. Food intake, water intake, urine volume, body weight, and fecal output were monitored daily. After euthanasia, colonic epithelial cells were isolated using calcium chelation and processed for systems-level analyses, that is, RNA-sequencing transcriptomics and mass spectrometry proteomics. Bile acid-fed rats suffered diarrhea, indicated by increased drinking, feces weight, and fecal water content compared with control rats. Urine output was unchanged. With bile acid feeding, RNA-sequencing revealed 204 increased and 401 decreased mRNAs; mass spectrometry revealed 183 increased and 111 decreased proteins. Among the altered genes were genes associated with electrolyte and water transport (including Slc12a7, Clca4, and Aqp3) and genes associated with bile acid transport (Slc2b1, Abcg2, Slc51a, Slc51b, and Fabps). Correlation analysis showed a significant positive correlation (Pearson's r = 0.28) between changes in mRNA expression and changes in protein expression. However, caution must be exercised in making a direct correlation between experimentally determined transcriptomes and proteomes. Genes associated with bile acid transport responded to bile acid feeding, suggesting that colonic bile acid transport also occur by regulated protein facilitated mechanisms in addition to passive diffusion. In summary, the study provides annotated rat colonic epithelial cell transcriptome and proteome with response to bile acid feeding.NEW & NOTEWORTHY Feeding rats with a bile acid caused changes in fecal output, underlining this bile acid diarrhea model's usefulness. Colonic epithelial expression of genes associated with facilitated transport of bile acids was altered during bile acid feeding. The study raises the possibility of regulated colonic transepithelial transport of bile acids in response to luminal bile acids. In addition, this study provides annotated rat colonic epithelial cell transcriptome and proteome with response to bile acid feeding.
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Affiliation(s)
- Jonathan Yde
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Qi Wu
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Johan F Borg
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Robert A Fenton
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Hanne B Moeller
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
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Fang X, Zhang S, Wang Z, Zhou J, Qi C, Song J. Cigarette smoke extract combined with LPS down-regulates the expression of MRP2 in chronic pulmonary inflammation may be related to FXR. Mol Immunol 2021; 137:174-186. [PMID: 34273652 DOI: 10.1016/j.molimm.2021.06.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/13/2021] [Accepted: 06/25/2021] [Indexed: 01/19/2023]
Abstract
The transporter multidrug resistance protein 2 (MRP2) plays an important role in chronic pulmonary inflammation by transporting cigarette smoke and other related inflammatory mediators. However, it is not completely clear whether pulmonary inflammation caused by cigarette smoke extract (CSE) and lipopolysaccharide (LPS) is related to MRP2 and its signal factors. In this study, CSE combined with LPS was used to establish an inflammation model in vivo and in vitro. We found that compared with the control group, after CSE combined with LPS treatment, the expression of MRP2 in rat lung tissue in vivo and human alveolar cell line in vitro was down-regulated, while the expression of inflammatory factors was up-regulated. Through silencing and overexpression of FXR, it was found that silent FXR could down-regulate MRP2 and up-regulate the expression of inflammatory factors. On the contrary, overexpression of FXR could up-regulate MRP2 and down-regulate the expression of inflammatory factors. Our results show that CSE combined with LPS can down-regulate the expression of MRP2 under inflammatory conditions, and the down-regulation of MRP2 expression may be achieved partly through the FXR signal pathway.
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Affiliation(s)
- Xin Fang
- Institute for Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China; Institute for the Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| | - Shuyi Zhang
- Institute for Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China; Institute for the Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| | - Zihao Wang
- Institute for Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China; Institute for the Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| | - Jian Zhou
- Institute for Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China; Institute for the Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| | - Chuanzong Qi
- Institute for Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China; Institute for the Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China
| | - Jue Song
- Institute for Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China; Institute for the Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, China.
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Systems Biology and Bile Acid Signalling in Microbiome-Host Interactions in the Cystic Fibrosis Lung. Antibiotics (Basel) 2021; 10:antibiotics10070766. [PMID: 34202495 PMCID: PMC8300688 DOI: 10.3390/antibiotics10070766] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/14/2021] [Accepted: 06/21/2021] [Indexed: 12/16/2022] Open
Abstract
The study of the respiratory microbiota has revealed that the lungs of healthy and diseased individuals harbour distinct microbial communities. Imbalances in these communities can contribute to the pathogenesis of lung disease. How these imbalances occur and establish is largely unknown. This review is focused on the genetically inherited condition of Cystic Fibrosis (CF). Understanding the microbial and host-related factors that govern the establishment of chronic CF lung inflammation and pathogen colonisation is essential. Specifically, dissecting the interplay in the inflammation–pathogen–host axis. Bile acids are important host derived and microbially modified signal molecules that have been detected in CF lungs. These bile acids are associated with inflammation and restructuring of the lung microbiota linked to chronicity. This community remodelling involves a switch in the lung microbiota from a high biodiversity/low pathogen state to a low biodiversity/pathogen-dominated state. Bile acids are particularly associated with the dominance of Proteobacterial pathogens. The ability of bile acids to impact directly on both the lung microbiota and the host response offers a unifying principle underpinning the pathogenesis of CF. The modulating role of bile acids in lung microbiota dysbiosis and inflammation could offer new potential targets for designing innovative therapeutic approaches for respiratory disease.
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Portincasa P, Di Ciaula A, Garruti G, Vacca M, De Angelis M, Wang DQH. Bile Acids and GPBAR-1: Dynamic Interaction Involving Genes, Environment and Gut Microbiome. Nutrients 2020; 12:E3709. [PMID: 33266235 PMCID: PMC7760347 DOI: 10.3390/nu12123709] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/25/2020] [Accepted: 11/26/2020] [Indexed: 02/06/2023] Open
Abstract
Bile acids (BA) are amphiphilic molecules synthesized in the liver from cholesterol. BA undergo continuous enterohepatic recycling through intestinal biotransformation by gut microbiome and reabsorption into the portal tract for uptake by hepatocytes. BA are detergent molecules aiding the digestion and absorption of dietary fat and fat-soluble vitamins, but also act as important signaling molecules via the nuclear receptor, farnesoid X receptor (FXR), and the membrane-associated G protein-coupled bile acid receptor 1 (GPBAR-1) in the distal intestine, liver and extra hepatic tissues. The hydrophilic-hydrophobic balance of the BA pool is finely regulated to prevent BA overload and liver injury. By contrast, hydrophilic BA can be hepatoprotective. The ultimate effects of BA-mediated activation of GPBAR-1 is poorly understood, but this receptor may play a role in protecting the remnant liver and in maintaining biliary homeostasis. In addition, GPBAR-1 acts on pathways involved in inflammation, biliary epithelial barrier permeability, BA pool hydrophobicity, and sinusoidal blood flow. Recent evidence suggests that environmental factors influence GPBAR-1 gene expression. Thus, targeting GPBAR-1 might improve liver protection, facilitating beneficial metabolic effects through primary prevention measures. Here, we discuss the complex pathways linked to BA effects, signaling properties of the GPBAR-1, mechanisms of liver damage, gene-environment interactions, and therapeutic aspects.
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Affiliation(s)
- Piero Portincasa
- Clinica Medica “A. Murri”, Department of Biomedical Sciences & Human Oncology, University of Bari Medical School, 70124 Bari, Italy;
| | - Agostino Di Ciaula
- Clinica Medica “A. Murri”, Department of Biomedical Sciences & Human Oncology, University of Bari Medical School, 70124 Bari, Italy;
| | - Gabriella Garruti
- Section of Endocrinology, Department of Emergency and Organ Transplantations, University of Bari “Aldo Moro” Medical School, Piazza G. Cesare 11, 70124 Bari, Italy;
| | - Mirco Vacca
- Dipartimento di Scienze del Suolo, Della Pianta e Degli Alimenti, Università degli Studi di Bari Aldo Moro, 70124 Bari, Italy; (M.V.); (M.D.A.)
| | - Maria De Angelis
- Dipartimento di Scienze del Suolo, Della Pianta e Degli Alimenti, Università degli Studi di Bari Aldo Moro, 70124 Bari, Italy; (M.V.); (M.D.A.)
| | - David Q.-H. Wang
- Department of Medicine and Genetics, Division of Gastroenterology and Liver Diseases, Marion Bessin Liver Research Center, Einstein-Mount Sinai Diabetes Research Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA;
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Role of Farnesoid X Receptor in the Pathogenesis of Respiratory Diseases. Can Respir J 2020; 2020:9137251. [PMID: 33294085 PMCID: PMC7714608 DOI: 10.1155/2020/9137251] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 11/02/2020] [Accepted: 11/13/2020] [Indexed: 12/14/2022] Open
Abstract
Farnesoid X receptor (FXR) is a bile acid receptor encoded by the Nr1h4 gene. FXR plays an important role in maintaining the stability of the internal environment and the integrity of many organs, including the liver and intestines. The expression of FXR in nondigestible tissues other than in the liver and small intestine is known as the expression of “nonclassical” bile acid target organs, such as blood vessels and lungs. In recent years, several studies have shown that FXR is widely involved in the pathogenesis of various respiratory diseases, such as chronic obstructive pulmonary disease, bronchial asthma, and idiopathic pulmonary fibrosis. Moreover, a number of works have confirmed that FXR can regulate the bile acid metabolism in the body and exert its anti-inflammatory and antifibrotic effects in the airways and lungs. In addition, FXR may be used as a potential therapeutic target for some respiratory diseases. For example, FXR can regulate the tumor microenvironment by regulating the balance of inflammatory and immune responses in the body to promote the occurrence and development of non-small-cell lung cancer (NSCLC), thereby being considered a potential target for immunotherapy of NSCLC. In this article, we provide an overview of the internal relationship between FXR and respiratory diseases to track the progress that has been achieved thus far in this direction and suggest potential therapeutic prospects of FXR in respiratory diseases.
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Bidault-Jourdainne V, Merlen G, Glénisson M, Doignon I, Garcin I, Péan N, Boisgard R, Ursic-Bedoya J, Serino M, Ullmer C, Humbert L, Abdelrafee A, Golse N, Vibert E, Duclos-Vallée JC, Rainteau D, Tordjmann T. TGR5 controls bile acid composition and gallbladder function to protect the liver from bile acid overload. JHEP Rep 2020; 3:100214. [PMID: 33604531 PMCID: PMC7872982 DOI: 10.1016/j.jhepr.2020.100214] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 10/29/2020] [Accepted: 10/30/2020] [Indexed: 12/13/2022] Open
Abstract
Background & Aims As the composition of the bile acid (BA) pool has a major impact on liver pathophysiology, we studied its regulation by the BA receptor Takeda G protein coupled receptor (TGR5), which promotes hepatoprotection against BA overload. Methods Wild-type, total and hepatocyte-specific TGR5-knockout, and TGR5-overexpressing mice were used in: partial (66%) and 89% extended hepatectomies (EHs) upon normal, ursodeoxycholic acid (UDCA)- or cholestyramine (CT)-enriched diet, bile duct ligation (BDL), cholic acid (CA)-enriched diet, and TGR5 agonist (RO) treatments. We thereby studied the impact of TGR5 on: BA composition, liver injury, regeneration and survival. We also performed analyses on the gut microbiota (GM) and gallbladder (GB). Liver BA composition was analysed in patients undergoing major hepatectomy. Results The TGR5-KO hyperhydrophobic BA composition was not directly related to altered BA synthesis, nor to TGR5-KO GM dysbiosis, as supported by hepatocyte-specific KO mice and co-housing experiments, respectively. The TGR5-dependent control of GB dilatation was crucial for BA composition, as determined by experiments including RO treatment and/or cholecystectomy. The poor TGR5-KO post-EH survival rate, related to exacerbated peribiliary necrosis and BA overload, was improved by shifting BAs toward a less toxic composition (CT treatment). After either BDL or a CA-enriched diet with or without cholecystectomy, we found that GB dilatation had strong TGR5-dependent hepatoprotective properties. In patients, a more hydrophobic liver BA composition was correlated with an unfavourable outcome after hepatectomy. Conclusions BA composition is crucial for hepatoprotection in mice and humans. We indicate TGR5 as a key regulator of BA profile and thereby as a potential hepatoprotective target under BA overload conditions. Lay summary Through multiple in vivo experimental approaches in mice, together with a patient study, this work brings some new light on the relationships between biliary homeostasis, gallbladder function, and liver protection. We showed that hepatic bile acid composition is crucial for optimal liver repair, not only in mice, but also in human patients undergoing major hepatectomy. Reducing BA hydrophobicity improves outcomes after major hepatectomy in mice. The BA receptor TGR5 controls BA pool composition, which is crucial for liver repair. TGR5 targets the gallbladder to induce a hepatoprotective effect. In patients, a more hydrophobic BA pool is associated with liver injury after hepatectomy.
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Key Words
- ALP, alkaline phosphatase
- ALT, alanine aminotransferase
- BA, bile acid
- BDL, bile duct ligation
- Bile acids
- CA, cholic acid
- CC, cholecystectomy
- CT, cholestyramine
- CYP, cytochrome P450
- EH, extended hepatectomy
- GB, gallbladder
- GM, gut microbiota
- GPBAR1
- GPBAR1, G protein-coupled bile acid receptor 1
- Gallbladder
- HI, hydrophobicity index
- Hepatoprotection
- KO, knockout
- ND, normal diet
- OA, oleanolic acid
- PH, partial hepatectomy
- TBA, total BA
- TGR5
- TGR5, Takeda G protein coupled receptor
- UDCA, ursodeoxycholic acid
- WT, wild-type
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Affiliation(s)
| | - Grégory Merlen
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
| | - Mathilde Glénisson
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
| | - Isabelle Doignon
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
| | - Isabelle Garcin
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
| | - Noémie Péan
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
| | - Raphael Boisgard
- Plateforme d'Imagerie du Petit Animal, SHFJ, 91405, Orsay, France
| | - José Ursic-Bedoya
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
| | - Matteo Serino
- IRSD, Université de Toulouse, INSERM, INRA, ENVT, UPS, U1220, CHU Purpan, CS60039, 31024, Toulouse, France
| | | | - Lydie Humbert
- Sorbonne Université, Centre de Recherche Saint Antoine, CRSA, INSERM U 1057, 75571, Paris Cedex 12, France
| | - Ahmed Abdelrafee
- Centre Hépato-Biliaire, Hôpital Paul Brousse, Université Paris-Saclay, 94800, Villejuif, France
| | - Nicolas Golse
- Centre Hépato-Biliaire, Hôpital Paul Brousse, Université Paris-Saclay, 94800, Villejuif, France
| | - Eric Vibert
- Centre Hépato-Biliaire, Hôpital Paul Brousse, Université Paris-Saclay, 94800, Villejuif, France
| | | | - Dominique Rainteau
- Sorbonne Université, Centre de Recherche Saint Antoine, CRSA, INSERM U 1057, 75571, Paris Cedex 12, France
| | - Thierry Tordjmann
- Université Paris Saclay, Faculté des Sciences d'Orsay, INSERM U.1193, bât. 443, 91405, Orsay, France
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10
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Merlen G, Bidault-Jourdainne V, Kahale N, Glenisson M, Ursic-Bedoya J, Doignon I, Garcin I, Humbert L, Rainteau D, Tordjmann T. Hepatoprotective impact of the bile acid receptor TGR5. Liver Int 2020; 40:1005-1015. [PMID: 32145703 DOI: 10.1111/liv.14427] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 02/17/2020] [Accepted: 02/24/2020] [Indexed: 02/13/2023]
Abstract
During liver repair after injury, bile secretion has to be tightly modulated in order to preserve liver parenchyma from bile acid (BA)-induced injury. The mechanisms allowing the liver to maintain biliary homeostasis during repair after injury are not completely understood. Besides their historical role in lipid digestion, bile acids (BA) and their receptors constitute a signalling network with multiple impacts on liver repair, both stimulating regeneration and protecting the liver from BA overload. BA signal through nuclear (mainly Farnesoid X Receptor, FXR) and membrane (mainly G Protein-coupled BA Receptor 1, GPBAR-1 or TGR5) receptors to elicit a wide array of biological responses. While a great number of studies have been dedicated to the hepato-protective impact of FXR signalling, TGR5 is by far less explored in this context. Because the liver has to face massive and potentially harmful BA overload after partial ablation or destruction, BA-induced protective responses crucially contribute to spare liver repair capacities. Based on the available literature, the TGR5 BA receptor protects the remnant liver and maintains biliary homeostasis, mainly through the control of inflammation, biliary epithelial barrier permeability, BA pool hydrophobicity and sinusoidal blood flow. Mouse experimental models of liver injury reveal that in the lack of TGR5, excessive inflammation, leaky biliary epithelium and hydrophobic BA overload result in parenchymal insult and compromise optimal restoration of a functional liver mass. Translational perspectives are thus opened to target TGR5 with the aim of protecting the liver in the context of injury and BA overload.
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Affiliation(s)
- Grégory Merlen
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
| | | | - Nicolas Kahale
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
| | - Mathilde Glenisson
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
| | - José Ursic-Bedoya
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
| | - Isabelle Doignon
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
| | - Isabelle Garcin
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
| | - Lydie Humbert
- Centre de Recherche Saint Antoine, CRSA, Sorbonne Université, Paris, France
| | - Dominique Rainteau
- Centre de Recherche Saint Antoine, CRSA, Sorbonne Université, Paris, France
| | - Thierry Tordjmann
- INSERM U1193, Faculté des Sciences d'Orsay, Université Paris Saclay, Orsay, France
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11
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Mroz MS, Harvey BJ. Ursodeoxycholic acid inhibits ENaC and Na/K pump activity to restore airway surface liquid height in cystic fibrosis bronchial epithelial cells. Steroids 2019; 151:108461. [PMID: 31344409 DOI: 10.1016/j.steroids.2019.108461] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Accepted: 07/15/2019] [Indexed: 01/22/2023]
Abstract
Cystic fibrosis (CF) is a disease caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) that in the airways result in reduced Cl- secretion and increased Na+ absorption, airway surface liquid (ASL) dehydration, decreased mucociliary clearance, infection and inflammation leading to lung injury. Cystic fibrosis patients often present with bile acids in the lower airways, however the effects of bile acids on ASL and ion transport in CF airways are not known. Secondary bile acids, such as ursodeoxycholic acid (UDCA), have been shown to modulate immune responses and epithelial ion transport. Here we investigated the effects of UDCA in normal and CF airway epithelial cell models. NuLi-1 (normal genotype) and CuFi-1 (CF genotype, Δ508/Δ508) primary immortalized airway epithelial cells were grown under an air-liquid interface. Electrogenic transepithelial ion transport was measured by short-circuit current (Isc) across cell monolayers mounted in Ussing chambers. We observed that UDCA (500 μM, 60 min, bilateral) decreased the basal Isc and ENaC currents in both NuLi-1 and CuFi-1 cells. UDCA inhibited the amiloride-sensitive ENaC current by 44% in NulI-1 monolayers and by 30% in CuFi-1 cells. Interestingly, UDCA also inhibited currents through the basolateral Na/K pump in both Nuli-1 and CuFi-1 monolayers without alterting the expression of ENaC or Na+/K+-ATPase proteins. The airway surface liquid height is regulated by transpeithelial Na+ absorption (ENaC) and Cl- secretion (CFTR) in normal airway but mainly by ENaC activity in CF epithelia when Cl- secretion is compromised by CFTR mutations. UDCA increased ASL height by 50% in Nuli-1 and by 40% in CUFI-1 monolayers. In conclusion, we demonstrate a previously unknown effect of UDCA to inhibit ENaC activity and increase ASL height in normal and CF human airway epithelial cells suggesting a therapeutic potential for UDCA in CF lung disease.
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Affiliation(s)
- Magdalena S Mroz
- Department of Molecular Medicine, Royal College of Surgeons in Ireland, RCSI ERC Beaumont Hospital, Dublin 9, Ireland
| | - Brian J Harvey
- Department of Molecular Medicine, Royal College of Surgeons in Ireland, RCSI ERC Beaumont Hospital, Dublin 9, Ireland; Centro di Estudios Cientificos CECs, Valdivia, Chile.
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12
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Comeglio P, Filippi S, Sarchielli E, Morelli A, Cellai I, Corno C, Adorini L, Vannelli GB, Maggi M, Vignozzi L. Therapeutic effects of the selective farnesoid X receptor agonist obeticholic acid in a monocrotaline-induced pulmonary hypertension rat model. J Endocrinol Invest 2019; 42:951-965. [PMID: 30674010 DOI: 10.1007/s40618-019-1009-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 01/11/2019] [Indexed: 12/27/2022]
Abstract
BACKGROUND Activation of the farnesoid X receptor (FXR), a member of the nuclear receptor steroid superfamily, leads to anti-inflammatory and anti-fibrotic effects in several tissues, including the lung. We have recently demonstrated a protective effect of the farnesoid X receptor (FXR) agonist obeticholic acid (OCA) in rat models of monocrotaline (MCT)-induced pulmonary arterial hypertension (PAH) and bleomycin-induced pulmonary fibrosis. The aim of the present study was to investigate whether the positive effects of OCA treatment could be exerted also in established MCT-induced PAH, i.e., starting treatment 2 weeks after MCT administration. METHODS Rats with MCT-induced PAH were treated, 2 weeks after MCT administration, with OCA or tadalafil for two additional weeks. Pulmonary functional tests were performed at week 2 (before treatment) and four (end of treatment). At the same time points, lung morphological features and expression profile of genes related to smooth muscle relaxation/contraction and tissue remodeling were also assessed. RESULTS 2 weeks after MCT-induced injury, the treadmill resistance (a functional parameter related to pulmonary hypertension) was significantly decreased. At the same time point, we observed right ventricular hypertrophy and vascular remodeling, with upregulation of genes related to inflammation. At week 4, we observed a further worsening of the functional and morphological parameters, accompanied by dysregulation of inflammatory and extracellular matrix markers mRNA expression. Administration of OCA (3 or 10 mg/kg/day), starting 2 weeks after MCT-induced injury, significantly improved pulmonary function, effectively normalizing the exercise capacity. OCA also reverted most of the lung alterations, with a significant reduction of lung vascular wall thickness, right ventricular hypertrophy, and restoration of the local balance between relaxant and contractile pathways. Markers of remodeling pathways were also normalized by OCA treatment. Notably, results with OCA treatment were similar, or even superior, to those obtained with tadalafil, a recently approved treatment for pulmonary hypertension. CONCLUSIONS The results of this study demonstrate a significant therapeutic effect of OCA in established MCT-induced PAH, improving exercise capacity associated with reduction of right ventricular hypertrophy and lung vascular remodeling. Thus, OCA dosing in a therapeutic protocol restores the balance between relaxant and contractile pathways in the lung, promoting cardiopulmonary protective actions in MCT-induced PAH.
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Affiliation(s)
- P Comeglio
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
| | - S Filippi
- Interdepartmental Laboratory of Functional and Cellular Pharmacology of Reproduction, Department of NEUROFARBA, University of Florence, Florence, Italy
| | - E Sarchielli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - A Morelli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - I Cellai
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
| | - C Corno
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
| | - L Adorini
- Intercept Pharmaceuticals, New York, NY, USA
| | - G B Vannelli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - M Maggi
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
- I.N.B.B. (Istituto Nazionale Biostrutture E Biosistemi), Rome, Italy
| | - L Vignozzi
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy.
- I.N.B.B. (Istituto Nazionale Biostrutture E Biosistemi), Rome, Italy.
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13
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Nakada EM, Bhakta NR, Korwin-Mihavics BR, Kumar A, Chamberlain N, Bruno SR, Chapman DG, Hoffman SM, Daphtary N, Aliyeva M, Irvin CG, Dixon AE, Woodruff PG, Amin S, Poynter ME, Desai DH, Anathy V. Conjugated bile acids attenuate allergen-induced airway inflammation and hyperresponsiveness by inhibiting UPR transducers. JCI Insight 2019; 4:98101. [PMID: 31045581 DOI: 10.1172/jci.insight.98101] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 04/02/2019] [Indexed: 12/14/2022] Open
Abstract
Conjugated bile acids (CBAs), such as tauroursodeoxycholic acid (TUDCA), are known to resolve the inflammatory and unfolded protein response (UPR) in inflammatory diseases, such as asthma. Whether CBAs exert their beneficial effects on allergic airway responses via 1 arm or several arms of the UPR, or alternatively through the signaling pathways for conserved bile acid receptor, remains largely unknown. We used a house dust mite-induced (HDM-induced) murine model of asthma to evaluate and compare the effects of 5 CBAs and 1 unconjugated bile acid in attenuating allergen-induced UPR and airway responses. Expression of UPR-associated transcripts was assessed in airway brushings from human patients with asthma and healthy subjects. Here we show that CBAs, such as alanyl β-muricholic acid (AβM) and TUDCA, significantly decreased inflammatory, immune, and cytokine responses; mucus metaplasia; and airway hyperresponsiveness, as compared with other CBAs in a model of allergic airway disease. CBAs predominantly bind to activating transcription factor 6α (ATF6α) compared with the other canonical transducers of the UPR, subsequently decreasing allergen-induced UPR activation and resolving allergic airway disease, without significant activation of the bile acid receptors. TUDCA and AβM also attenuated other HDM-induced ER stress markers in the lungs of allergic mice. Quantitative mRNA analysis of airway epithelial brushings from human subjects demonstrated that several ATF6α-related transcripts were significantly upregulated in patients with asthma compared with healthy subjects. Collectively, these results demonstrate that CBA-based therapy potently inhibits the allergen-induced UPR and allergic airway disease in mice via preferential binding of the canonical transducer of the UPR, ATF6α. These results potentially suggest a novel avenue to treat allergic asthma using select CBAs.
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Affiliation(s)
- Emily M Nakada
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Nirav R Bhakta
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, UCSF School of Medicine, San Francisco, California, USA
| | - Bethany R Korwin-Mihavics
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Amit Kumar
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Nicolas Chamberlain
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Sierra R Bruno
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - David G Chapman
- Department of Medicine, Division of Pulmonary Disease and Critical Care Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA.,Translational Airways Group, Discipline of Medical Science, University of Technology Sydney, Ultimo, Australia.,Woolcock Institute of Medical Research, University of Sydney, Glebe, Australia
| | - Sidra M Hoffman
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Nirav Daphtary
- Department of Medicine, Division of Pulmonary Disease and Critical Care Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Minara Aliyeva
- Department of Medicine, Division of Pulmonary Disease and Critical Care Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Charles G Irvin
- Department of Medicine, Division of Pulmonary Disease and Critical Care Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Anne E Dixon
- Department of Medicine, Division of Pulmonary Disease and Critical Care Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Prescott G Woodruff
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, UCSF School of Medicine, San Francisco, California, USA
| | - Shantu Amin
- Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA
| | - Matthew E Poynter
- Department of Medicine, Division of Pulmonary Disease and Critical Care Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
| | - Dhimant H Desai
- Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA
| | - Vikas Anathy
- Department of Pathology and Laboratory Medicine, University of Vermont, Larner College of Medicine, Burlington, Vermont, USA
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14
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Comeglio P, Filippi S, Sarchielli E, Morelli A, Cellai I, Corno C, Pini A, Adorini L, Vannelli GB, Maggi M, Vignozzi L. Therapeutic effects of obeticholic acid (OCA) treatment in a bleomycin-induced pulmonary fibrosis rat model. J Endocrinol Invest 2019; 42:283-294. [PMID: 29923060 DOI: 10.1007/s40618-018-0913-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 06/11/2018] [Indexed: 02/07/2023]
Abstract
PURPOSE We recently demonstrated a protective effect of the farnesoid X receptor agonist obeticholic acid (OCA) in rat models of bleomycin-induced pulmonary fibrosis (PF). Aim of the present study was to investigate whether the positive effects of OCA treatment are apparent also on ongoing bleomycin-induced PF, i.e., after 2 weeks of bleomycin administration. METHODS Bleomycin-induced PF rats were treated 2 weeks after bleomycin administration with OCA or pirfenidone for two additional weeks. Pulmonary function test was performed at 2 and 4 weeks in all experimental groups. At the same time points, lung morphological features and mRNA expression profile of genes related to fibrosis, inflammation and epithelial-mesenchymal transition were also assessed. RESULTS After 2 weeks, bleomycin significantly increased the pressure at the airway opening (PAO), a functional parameter related to fibrosis-induced lung stiffness, and induced diffuse lung interstitium fibrosis, with upregulation of inflammation (IL1β, MCP1) and tissue remodeling (COL1A1, COL3A1, ET1, MMP7, PDGFa, αSMA, SNAI1) markers. At week four, a further increase of lung fibrosis and PAO was observed, accompanied by upregulation of extracellular matrix-related mRNA expression. OCA administration, even after the establishment of PF, significantly improved pulmonary function, normalizing PAO, and reverted the bleomycin-induced lung alterations, with significant reduction of markers of inflammation (CD206, COX2, HIF1, IL1β, MCP1), epithelial proliferation (CTGF, PDGFa) and fibrosis (COL1A1, COL3A1, ET1, FN1, MMPs, αSMA, SNAIs, TGFβ1, TIMPs). Results with OCA were similar or superior to those obtained with pirfenidone. CONCLUSIONS In conclusion, our results demonstrate a significant therapeutic effect of OCA in already established PF.
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Affiliation(s)
- P Comeglio
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
| | - S Filippi
- Interdepartmental Laboratory of Functional and Cellular Pharmacology of Reproduction, Department of NEUROFARBA, University of Florence, Florence, Italy
| | - E Sarchielli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - A Morelli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - I Cellai
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
| | - C Corno
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
| | - A Pini
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - L Adorini
- Intercept Pharmaceuticals, New York, NY, USA
| | - G B Vannelli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - M Maggi
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy
- I.N.B.B. (Istituto Nazionale Biostrutture e Biosistemi), Rome, Italy
| | - L Vignozzi
- Sexual Medicine and Andrology Unit, Department of Biomedical, Experimental and Clinical Sciences, University of Florence, AOU Careggi, Viale Pieraccini, 6, 50139, Florence, Italy.
- I.N.B.B. (Istituto Nazionale Biostrutture e Biosistemi), Rome, Italy.
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15
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Bartoszewski R, Matalon S, Collawn JF. Ion channels of the lung and their role in disease pathogenesis. Am J Physiol Lung Cell Mol Physiol 2017; 313:L859-L872. [PMID: 29025712 PMCID: PMC5792182 DOI: 10.1152/ajplung.00285.2017] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 10/03/2017] [Accepted: 10/03/2017] [Indexed: 12/16/2022] Open
Abstract
Maintenance of normal epithelial ion and water transport in the lungs includes providing a thin layer of surface liquid that coats the conducting airways. This airway surface liquid is critical for normal lung function in a number of ways but, perhaps most importantly, is required for normal mucociliary clearance and bacterial removal. Preservation of the appropriate level of hydration, pH, and viscosity for the airway surface liquid requires the proper regulation and function of a battery of different types of ion channels and transporters. Here we discuss how alterations in ion channel/transporter function often lead to lung pathologies.
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Affiliation(s)
- Rafal Bartoszewski
- Department of Biology and Pharmaceutical Botany, Medical University of Gdansk, Gdansk, Poland
| | - Sadis Matalon
- Department of Anesthesiology and Perioperative Medicine, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
- Department of Cell, Developmental, and Integrative Biology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
- Pulmonary Injury and Repair Center, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
- Gregory Fleming James Cystic Fibrosis Center, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - James F Collawn
- Department of Cell, Developmental, and Integrative Biology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama;
- Pulmonary Injury and Repair Center, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
- Gregory Fleming James Cystic Fibrosis Center, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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16
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Comeglio P, Morelli A, Adorini L, Maggi M, Vignozzi L. Beneficial effects of bile acid receptor agonists in pulmonary disease models. Expert Opin Investig Drugs 2017; 26:1215-1228. [PMID: 28949776 DOI: 10.1080/13543784.2017.1385760] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Bile acids act as steroid hormones, controlling lipid, glucose and energy metabolism, as well as inflammation and fibrosis. Their actions are implemented through activation of nuclear (FXR, VDR, PXR) and membrane G protein-coupled (TGR5, S1PR2) receptors. Areas covered: This review discusses the potential of FXR and TGR5 as therapeutic targets in the treatment of pulmonary disorders linked to metabolism and/or inflammation. Obeticholic acid (OCA) is the most clinically advanced bile acid-derived agonist for FXR-mediated anti-inflammatory and anti-fibrotic effects. It therefore represents an attractive pharmacological approach for the treatment of lung conditions characterized by vascular and endothelial dysfunctions. Expert opinion: Inflammation, vascular remodeling and fibrotic processes characterize the progression of pulmonary arterial hypertension (PAH) and idiopathic pulmonary fibrosis (IPF). These processes are only partially targeted by the available therapeutic options and still represent a relevant medical need. The results hereby summarized demonstrate OCA efficacy in preventing experimental lung disorders, i.e. monocrotaline-induced PAH and bleomycin-induced fibrosis, by abating proinflammatory and vascular remodeling progression. TGR5 is also expressed in the lung, and targeting the TGR5 pathway, using the TGR5 agonist INT-777 or the dual FXR/TGR5 agonist INT-767, could also contribute to the treatment of pulmonary disorders mediated by inflammation and fibrosis.
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Affiliation(s)
- Paolo Comeglio
- a Department of Biomedical, Experimental and Clinical Sciences , University of Florence , Florence , Italy
| | - Annamaria Morelli
- b Department of Experimental and Clinical Medicine , University of Florence , Florence , Italy
| | | | - Mario Maggi
- a Department of Biomedical, Experimental and Clinical Sciences , University of Florence , Florence , Italy
| | - Linda Vignozzi
- a Department of Biomedical, Experimental and Clinical Sciences , University of Florence , Florence , Italy
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17
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Cystic fibrosis lung environment and Pseudomonas aeruginosa infection. BMC Pulm Med 2016; 16:174. [PMID: 27919253 PMCID: PMC5139081 DOI: 10.1186/s12890-016-0339-5] [Citation(s) in RCA: 223] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/24/2016] [Indexed: 12/20/2022] Open
Abstract
Background The airways of patients with cystic fibrosis (CF) are highly complex, subject to various environmental conditions as well as a distinct microbiota. Pseudomonas aeruginosa is recognized as one of the most important pulmonary pathogens and the predominant cause of morbidity and mortality in CF. A multifarious interplay between the host, pathogens, microbiota, and the environment shapes the course of the disease. There have been several excellent reviews detailing CF pathology, Pseudomonas and the role of environment in CF but only a few reviews connect these entities with regards to influence on the overall course of the disease. A holistic understanding of contributing factors is pertinent to inform new research and therapeutics. Discussion In this article, we discuss the deterministic alterations in lung physiology as a result of CF. We also revisit the impact of those changes on the microbiota, with special emphasis on P. aeruginosa and the influence of other non-genetic factors on CF. Substantial past and current research on various genetic and non-genetic aspects of cystic fibrosis has been reviewed to assess the effect of different factors on CF pulmonary infection. A thorough review of contributing factors in CF and the alterations in lung physiology indicate that CF lung infection is multi-factorial with no isolated cause that should be solely targeted to control disease progression. A combinatorial approach may be required to ensure better disease outcomes. Conclusion CF lung infection is a complex disease and requires a broad multidisciplinary approach to improve CF disease outcomes. A holistic understanding of the underlying mechanisms and non-genetic contributing factors in CF is central to development of new and targeted therapeutic strategies.
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18
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Chen B, You WJ, Xue S, Qin H, Zhao XJ, Zhang M, Liu XQ, Zhu SY, Jiang HD. Overexpression of farnesoid X receptor in small airways contributes to epithelial to mesenchymal transition and COX-2 expression in chronic obstructive pulmonary disease. J Thorac Dis 2016; 8:3063-3074. [PMID: 28066584 DOI: 10.21037/jtd.2016.11.08] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Epithelial-mesenchymal transition (EMT) and cyclooxygenase-2 (COX-2) contribute to airway remodelling and inflammation in chronic obstructive pulmonary disease (COPD). Recent data suggest that the farnesoid X receptor (FXR), a nuclear receptor traditionally considered as bile acid-activated receptor, is also expressed in non-classical bile acids target tissues with novel functions beyond regulating bile acid homeostasis. This study aimed to investigate the potential role of FXR in the development of COPD, as well as factors that affect FXR expression. METHODS Expression of FXR, EMT biomarkers and COX-2 was examined by immunohistochemistry in lung tissues from non-smokers, smokers, and smokers with COPD. The role of FXR in TGF-β1-induced EMT and COX-2 expression in human bronchial epithelial (HBE) cells was evaluated in vitro. Factors regulating FXR expression were assessed in cultured HBE cells and a cigarette smoke-induced rat model of COPD. RESULTS Expression of FXR, EMT markers and COX-2 was significantly elevated in small airway epithelium of COPD patients compared with controls. The staining scores of FXR in small airway epithelium were negatively related with FEV1% of predicted of smokers without and with COPD. FXR agonist GW4064 remarkably enhanced and FXR antagonist Z-Guggulsterone significantly inhibited EMT changes in TGF-β1-treated HBE cells. Both chenodeoxycholic acid (CDCA) and GW4064 increased COX-2 expression in HBE cells, whereas Z-Guggulsterone dramatically restrained CDCA-induced COX-2 expression. Finally, FXR expression is induced by IL-4 and IL-13 in HBE cells, as well as by cigarette smoke exposure in a rat model of COPD. CONCLUSIONS Overexpression of FXR in small airway may contribute to airway remodelling and inflammation in COPD by regulating EMT and COX-2 expression.
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Affiliation(s)
- Bi Chen
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Wen-Jie You
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Shan Xue
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Hui Qin
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Xu-Ji Zhao
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Miao Zhang
- Department of Respiratory Medicine, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221000, China
| | - Xue-Qing Liu
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Shu-Yang Zhu
- Department of Respiratory Medicine, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221000, China
| | - Han-Dong Jiang
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
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Chen B, Cai HR, Xue S, You WJ, Liu B, Jiang HD. Bile acids induce activation of alveolar epithelial cells and lung fibroblasts through farnesoid X receptor-dependent and independent pathways. Respirology 2016; 21:1075-80. [PMID: 27185272 DOI: 10.1111/resp.12815] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 12/28/2015] [Accepted: 01/19/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND OBJECTIVE The roles of bile acid microaspiration and bile acid-activated farnesoid X receptor (FXR) in the pathogenesis of idiopathic pulmonary fibrosis (IPF) remain unclear. We hypothesized that bile acids activate alveolar epithelial cells (AECs) and lung fibroblasts, which may be regulated by FXR activation. METHODS Human AECs and normal or IPF-derived lung fibroblast cells were incubated with the three major bile acids: lithocholic acid (LCA), deoxycholic acid (DCA) and chenodeoxycholic acid (CDCA). The AECs injury indices, epithelial-mesenchymal transition (EMT) and lung fibroblast activation were evaluated. FXR expression in IPF lungs and the roles of FXR and FXR-independent pathways in bile acid-induced profibrotic effects were also investigated. RESULTS LCA, DCA and CDCA reduced cell viability and increased intracellular reactive oxygen species (ROS) production in A549 cells. They all induced EMT, as shown by enhanced α-SMA and vimentin and decreased E-cadherin levels. LCA directly induced differentiation of lung fibroblasts to myofibroblasts. All three bile acids promoted cellular migration but not proliferation of lung fibroblasts. FXR expression was upregulated in IPF lungs, and inhibition of FXR restrained the bile acid-induced EMT and lung fibroblast activation. Differentiation and proliferation were enhanced in lung fibroblasts exposed to conditioned medium from bile acid-stimulated A549 cells, which contained increased levels of profibrotic factors. TGF-β/Smad3 signaling was also involved in the bile acid-induced EMT and lung fibroblast differentiation. CONCLUSION Bile acid microaspiration may promote the development of pulmonary fibrosis by inducing activation of AECs and lung fibroblasts via FXR-dependent and independent pathways.
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Affiliation(s)
- Bi Chen
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Hou-Rong Cai
- Department of Respiratory Medicine, the Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Shan Xue
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Wen-Jie You
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Bin Liu
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Han-Dong Jiang
- Department of Respiratory Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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Sasamoto K, Niisato N, Taruno A, Marunaka Y. Simulation of Cl(-) Secretion in Epithelial Tissues: New Methodology Estimating Activity of Electro-Neutral Cl(-) Transporter. Front Physiol 2015; 6:370. [PMID: 26779025 PMCID: PMC4688368 DOI: 10.3389/fphys.2015.00370] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 11/20/2015] [Indexed: 12/21/2022] Open
Abstract
Transcellular Cl− secretion is, in general, mediated by two steps; (1) the entry step of Cl− into the cytosolic space from the basolateral space across the basolateral membrane by Cl− transporters, such as Na+-K+-2Cl− cotransporter (NKCC1, an isoform of NKCC), and (2) the releasing step of Cl− from the cytosolic space into the luminal (air) space across the apical membrane via Cl− channels, such as cystic fibrosis transmembrane conductance regulator (CFTR) Cl− channel. Transcellular Cl− secretion has been characterized by using various experimental techniques. For example, measurements of short-circuit currents in the Ussing chamber and patch clamp techniques provide us information on transepithelial ion movements via transcellular pathway, transepithelial conductance, activity (open probability) of single channel, and whole cell currents. Although many investigators have tried to clarify roles of Cl− channels and transporters located at the apical and basolateral membranes in transcellular Cl− secretion, it is still unclear how Cl− channels/transporters contribute to transcellular Cl− secretion and are regulated by various stimuli such as Ca2+ and cAMP. In the present study, we simulate transcellular Cl− secretion using mathematical models combined with electrophysiological measurements, providing information on contribution of Cl− channels/transporters to transcellular Cl− secretion, activity of electro-neutral ion transporters and how Cl− channels/transporters are regulated.
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Affiliation(s)
- Kouhei Sasamoto
- Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine Kyoto, Japan
| | - Naomi Niisato
- Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of MedicineKyoto, Japan; Department of Health and Sports Sciences, Faculty of Health and Medical Sciences, Kyoto Gakuen UniversityKameoka, Japan; Japan Institute for Food Education and Health, St. Agnes' UniversityKyoto, Japan
| | - Akiyuki Taruno
- Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine Kyoto, Japan
| | - Yoshinori Marunaka
- Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of MedicineKyoto, Japan; Japan Institute for Food Education and Health, St. Agnes' UniversityKyoto, Japan; Department of Bio-Ionomics, Graduate School of Medical Science, Kyoto Prefectural University of MedicineKyoto, Japan
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Kowal JM, Haanes KA, Christensen NM, Novak I. Bile acid effects are mediated by ATP release and purinergic signalling in exocrine pancreatic cells. Cell Commun Signal 2015; 13:28. [PMID: 26050734 PMCID: PMC4459444 DOI: 10.1186/s12964-015-0107-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 05/26/2015] [Indexed: 02/06/2023] Open
Abstract
Background In many cells, bile acids (BAs) have a multitude of effects, some of which may be mediated by specific receptors such the TGR5 or FXR receptors. In pancreas systemic BAs, as well as intra-ductal BAs from bile reflux, can affect pancreatic secretion. Extracellular ATP and purinergic signalling are other important regulators of similar secretory mechanisms in pancreas. The aim of our study was to elucidate whether there is interplay between ATP and BA signalling. Results Here we show that CDCA (chenodeoxycholic acid) caused fast and concentration-dependent ATP release from acini (AR42J) and duct cells (Capan-1). Taurine and glycine conjugated forms of CDCA had smaller effects on ATP release in Capan-1 cells. In duct monolayers, CDCA stimulated ATP release mainly from the luminal membrane; the releasing mechanisms involved both vesicular and non-vesicular secretion pathways. Duct cells were not depleted of intracellular ATP with CDCA, but acinar cells lost some ATP, as detected by several methods including ATP sensor AT1.03YEMK. In duct cells, CDCA caused reversible increase in the intracellular Ca2+ concentration [Ca2 +]i, which could be significantly inhibited by antagonists of purinergic receptors. The TGR5 receptor, expressed on the luminal side of pancreatic ducts, was not involved in ATP release and Ca2+ signals, but could stimulate Na+/Ca2+ exchange in some conditions. Conclusions CDCA evokes significant ATP release that can stimulate purinergic receptors, which in turn increase [Ca2+]i. The TGR5 receptor is not involved in these processes but can play a protective role at high intracellular Ca2+ conditions. We propose that purinergic signalling could be taken into consideration in other cells/organs, and thereby potentially explain some of the multifaceted effects of BAs. Electronic supplementary material The online version of this article (doi:10.1186/s12964-015-0107-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Justyna M Kowal
- Department of Biology, Section for Cell Biology and Physiology, August Krogh Building, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark.
| | - Kristian A Haanes
- Department of Biology, Section for Cell Biology and Physiology, August Krogh Building, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark. .,Present address: Department of Clinical Experimental Research, Glostrup Research Institute, Copenhagen University Hospital, Glostrup, Denmark.
| | - Nynne M Christensen
- Department of Biology, Section for Cell Biology and Physiology, August Krogh Building, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark.
| | - Ivana Novak
- Department of Biology, Section for Cell Biology and Physiology, August Krogh Building, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark.
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Jourdainne V, Péan N, Doignon I, Humbert L, Rainteau D, Tordjmann T. The Bile Acid Receptor TGR5 and Liver Regeneration. Dig Dis 2015; 33:319-26. [PMID: 26045264 DOI: 10.1159/000371668] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Most of the literature on the bile acid (BA) membrane receptor TGR5 is dedicated to its potential role in the metabolic syndrome, through its regulatory impact on energy expenditure, insulin and GLP-1 secretion, and inflammatory processes. While the receptor was cloned in 2002, very little data are available on TGR5 functions in the normal and diseased liver. However, TGR5 is highly expressed in Kupffer cells and liver endothelial cells, and is particularly enriched in the biliary tract [cholangiocytes and gallbladder (GB) smooth muscle cells]. We recently demonstrated that TGR5 has a crucial protective impact on the liver in case of BA overload, including after partial hepatectomy. KEY MESSAGES TGR5-KO mice after PH exhibited periportal bile infarcts, excessive hepatic inflammation and defective adaptation of biliary composition (bicarbonate and chloride). Most importantly, TGR5-KO mice had a more hydrophobic BA pool, with more secondary BA than WT animals, suggesting that TGR5-KO bile may be harmful for the liver, mainly in situations of BA overload. As GB is both the tissue displaying the highest level of TGR5 expression and a crucial physiological site for the regulation of BA pool hydrophobicity by reducing secondary BA, we investigated whether TGR5 may control BA pool composition through an impact on GB. Preliminary data suggest that in the absence of TGR5, reduced GB filling dampens the cholecystohepatic shunt, resulting in more secondary BA, more hydrophobic BA pool and extensive liver injury in case of BA overload. CONCLUSIONS In the setting of BA overload, TGR5 is protective of the liver through the regulation of not only secretory and inflammatory processes, but also through the control of BA pool composition, at least in part by targeting the GB. Thereby, TGR5 appears to be crucial for protecting the regenerating liver from BA overload.
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