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Teng L, Dedousis N, Adeshirlarijaney A, Kanshana JS, Liu M, Hodges CA, Kohan AB. Impaired intestinal free fatty acid transport followed by chylomicron malformation, not pancreatic insufficiency, cause metabolic defects in cystic fibrosis. J Lipid Res 2024; 65:100551. [PMID: 39002195 PMCID: PMC11301217 DOI: 10.1016/j.jlr.2024.100551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 04/03/2024] [Accepted: 04/29/2024] [Indexed: 07/15/2024] Open
Abstract
Intestinal disease is one of the earliest manifestations of cystic fibrosis (CF) in children and is closely tied to deficits in growth and nutrition, both of which are directly linked to future mortality. Patients are treated aggressively with pancreatic enzyme replacement therapy and a high-fat diet to circumvent fat malabsorption, but this does not reverse growth and nutritional defects. We hypothesized that defects in chylomicron production could explain why CF body weights and nutrition are so resistant to clinical treatments. We used gold standard intestinal lipid absorption and metabolism approaches, including mouse mesenteric lymph cannulation, in vivo chylomicron secretion kinetics, transmission electron microscopy, small intestinal organoids, and chylomicron metabolism assays to test this hypothesis. In mice expressing the G542X mutation in cystic fibrosis transmembrane conductance regulator (CFTR-/- mice), we find that defective FFA trafficking across the epithelium into enterocytes drives a chylomicron formation defect. Furthermore, G542X mice secrete small, triglyceride-poor chylomicrons into the lymph and blood. These defective chylomicrons are cleared into extraintestinal tissues at ∼10-fold faster than WT chylomicrons. This defect in FFA absorption resulting in dysfunctional chylomicrons cannot be explained by steatorrhea or pancreatic insufficiency and is maintained in primary small intestinal organoids treated with micellar lipids. These studies suggest that the ultrahigh-fat diet that most people with CF are counselled to follow may instead make steatorrhea and malabsorption defects worse by overloading the absorptive capacity of the CF small intestine.
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Affiliation(s)
- Lihong Teng
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Nikolaos Dedousis
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Aneseh Adeshirlarijaney
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Jitendra S Kanshana
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Min Liu
- Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Craig A Hodges
- Department of Genetics and Genome Sciences and Department of Pediatrics, Case Western Reserve University, Cleveland, OH, USA
| | - Alison B Kohan
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA.
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2
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Lonabaugh K, Li G, List R, Huang R, James A, Barros A, Somerville L, Albon D. Real world study on elexacaftor-tezacaftor-ivacaftor impact on cholesterol levels in adults with cystic fibrosis. Pharmacotherapy 2024; 44:231-240. [PMID: 38143243 DOI: 10.1002/phar.2903] [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: 06/20/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 12/26/2023]
Abstract
INTRODUCTION The introduction of the highly effective modulator therapy elexacaftor-tezacaftor-ivacaftor (ETI) has revolutionized the care of persons with cystic fibrosis (PwCF) with major improvements seen in lung function and body mass index. The effects of ETI therapy in real-world cohorts on other parameters such as cholesterol levels are largely unknown. METHODS A single-center, retrospective chart review study was conducted to assess the change in lipid panels before and after ETI initiation. The study investigated total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), and triglyceride levels using both a univariate and multivariate mixed-effects model to evaluate the change after initiation of ETI in a cohort of PwCF. RESULTS There were 128 adult PwCF included in the analysis. Statistically significant changes were seen in both univariate and multivariate analyses for TC, LDL-C, and HDL-C. On multivariate analysis, TC increased by an average of 15.0 mg/dL after ETI initiation (p < 0.0001), LDL-C increased by an average of 9.3 mg/dL (p < 0.001), and HDL-C increased by an average of 3.8 mg/dL (p < 0.001) after ETI initiation. CONCLUSION In this real-world cohort of PwCF, cholesterol parameters increased after initiation with ETI therapy. Further consideration may need to be given for PwCF in regards to screening for cardiometabolic risk factors as PwCF age as well as the potential need for cholesterol-lowering therapies.
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Affiliation(s)
- Kevin Lonabaugh
- University of Virginia Health, Charlottesville, Virginia, USA
| | - Galvin Li
- University of Virginia Health, Charlottesville, Virginia, USA
| | - Rhonda List
- University of Virginia Health, Charlottesville, Virginia, USA
| | - Reyna Huang
- University of Virginia Health, Charlottesville, Virginia, USA
| | - Amber James
- University of Virginia Health, Charlottesville, Virginia, USA
| | - Andrew Barros
- University of Virginia Health, Charlottesville, Virginia, USA
| | | | - Dana Albon
- University of Virginia Health, Charlottesville, Virginia, USA
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3
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Lu X, Luo C, Wu J, Deng Y, Mu X, Zhang T, Yang X, Liu Q, Li Z, Tang S, Hu Y, Du Q, Xu J, Xie R. Ion channels and transporters regulate nutrient absorption in health and disease. J Cell Mol Med 2023; 27:2631-2642. [PMID: 37638698 PMCID: PMC10494301 DOI: 10.1111/jcmm.17853] [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: 04/19/2023] [Revised: 07/03/2023] [Accepted: 07/06/2023] [Indexed: 08/29/2023] Open
Abstract
Ion channels and transporters are ubiquitously expressed on cell membrane, which involve in a plethora of physiological process such as contraction, neurotransmission, secretion and so on. Ion channels and transporters is of great importance to maintaining membrane potential homeostasis, which is essential to absorption of nutrients in gastrointestinal tract. Most of nutrients are electrogenic and require ion channels and transporters to absorb. This review summarizes the latest research on the role of ion channels and transporters in regulating nutrient uptake such as K+ channels, Ca2+ channels and ion exchangers. Revealing the mechanism of ion channels and transporters associated with nutrient uptake will be helpful to provide new methods to diagnosis and find potential targets for diseases like diabetes, inflammatory bowel diseases, etc. Even though some of study still remain ambiguous and in early stage, we believe that ion channels and transporters will be novel therapeutic targets in the future.
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Affiliation(s)
- Xianmin Lu
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Chen Luo
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Jiangbo Wu
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Ya Deng
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Xingyi Mu
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Ting Zhang
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Xiaoxu Yang
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Qi Liu
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Zhuo Li
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Siqi Tang
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Yanxia Hu
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Qian Du
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Jingyu Xu
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
| | - Rui Xie
- Department of GastroenterologyDigestive Disease Hospital, Affiliated Hospital of Zunyi Medical UniversityZunyiChina
- The Collaborative InnovAffiliated Hospital of Zunyi Medical Universityation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical UniversityZunyiChina
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4
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Chen D, Li H, Wang X, Zhang L, Ji Z, Zhang J. Hypertriglyceridemia impairs urethral spontaneous tone through down-regulation of ANO1 in mouse urethral smooth muscle cells. Urology 2022; 165:157-163. [DOI: 10.1016/j.urology.2022.01.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 01/26/2022] [Accepted: 01/28/2022] [Indexed: 11/16/2022]
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5
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Ghanemi A, Yoshioka M, St-Amand J. Trefoil Factor Family Member 2: From a High-Fat-Induced Gene to a Potential Obesity Therapy Target. Metabolites 2021; 11:metabo11080536. [PMID: 34436477 PMCID: PMC8401738 DOI: 10.3390/metabo11080536] [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: 07/30/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 12/11/2022] Open
Abstract
Obesity has its epidemiological patterns continuously increasing. With controlling both diet and exercise being the main approaches to manage the energy metabolism balance, a high-fat (HF) diet is of particular importance. Indeed, lipids have a low satiety potential but a high caloric density. Thus, focusing on pharmacologically targetable pathways remains an approach with promising therapeutic potential. Within this context, trefoil factor family member 2 (Tff2) has been characterized as specifically induced by HF diet rather than low-fat diet. TFF2 has also been linked to diverse neurological mechanisms and metabolic patterns suggesting its role in energy balance. The hypothesis is that TFF2 would be a HF diet-induced signal that regulates metabolism with a focus on lipids. Within this review, we put the spotlight on key findings highlighting this line of thought. Importantly, the hypothetical mechanisms pointed highlight TFF2 as an important contributor to obesity development via increasing lipids intestinal absorption and anabolism. Therefore, an outlook for future experimental activities and evaluation of the therapeutic potential of TFF2 inhibition is given. Indeed, its knockdown or downregulation would contribute to an antiobesity phenotype. We believe this work represents an addition to our understanding of the lipidic molecular implications in obesity, which will contribute to develop therapies aiming to manage the lipidic metabolic pathways including the absorption, storage and metabolism via targeting TFF2-related pathways. We briefly discuss important relevant concepts for both basic and clinical researchers.
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Affiliation(s)
- Abdelaziz Ghanemi
- Functional Genomics Laboratory, CREMI, Québec Genome Center, CHUL-CHU de Québec Research Center, Quebec, QC G1V 4G2, Canada; (A.G.); (M.Y.)
- Department of Molecular Medicine, Faculty of Medicine, Laval University, Quebec, QC G1V 0A6, Canada
| | - Mayumi Yoshioka
- Functional Genomics Laboratory, CREMI, Québec Genome Center, CHUL-CHU de Québec Research Center, Quebec, QC G1V 4G2, Canada; (A.G.); (M.Y.)
| | - Jonny St-Amand
- Functional Genomics Laboratory, CREMI, Québec Genome Center, CHUL-CHU de Québec Research Center, Quebec, QC G1V 4G2, Canada; (A.G.); (M.Y.)
- Department of Molecular Medicine, Faculty of Medicine, Laval University, Quebec, QC G1V 0A6, Canada
- Correspondence:
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6
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Koudoufio M, Feldman F, Ahmarani L, Delvin E, Spahis S, Desjardins Y, Levy E. Intestinal protection by proanthocyanidins involves anti-oxidative and anti-inflammatory actions in association with an improvement of insulin sensitivity, lipid and glucose homeostasis. Sci Rep 2021; 11:3878. [PMID: 33594093 PMCID: PMC7886900 DOI: 10.1038/s41598-020-80587-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/16/2020] [Indexed: 12/16/2022] Open
Abstract
Recent advances have added another dimension to the complexity of cardiometabolic disorders (CMD) by directly implicating the gastrointestinal tract as a key player. In fact, multiple factors could interfere with intestinal homeostasis and elicit extra-intestinal CMD. As oxidative stress (OxS), inflammation, insulin resistance and lipid abnormalities are among the most disruptive events, the aim of the present study is to explore whether proanthocyanidins (PACs) exert protective effects against these disorders. To this end, fully differentiated intestinal Caco-2/15 cells were pre-incubated with PACs with and without the pro-oxidant and pro-inflammatory iron/ascorbate (Fe/Asc). PACs significantly reduce malondialdehyde, a biomarker of lipid peroxidation, and raise antioxidant SOD2 and GPx via the increase of NRF2/Keap1 ratio. Likewise, PACs decrease the inflammatory agents TNFα and COX2 through abrogation of NF-κB. Moreover, according to crucial biomarkers, PACs result in lipid homeostasis improvement as reflected by enhanced fatty acid β-oxidation, diminished lipogenesis, and lowered gluconeogenesis as a result of PPARα, γ and SREBP1c modulation. Since these metabolic routes are mainly regulated by insulin sensitivity, we have examined the insulin signaling pathway and found an upregulation of phosphoPI3K/Akt and downregulation of p38-MAPK expressions, indicating beneficial effects in response to PACs. Taken together, PACs display the potential to counterbalance OxS and inflammation in Fe/Asc-exposed intestinal cells, in association with an improvement of insulin sensitivity, which ameliorates lipid and glucose homeostasis.
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Affiliation(s)
- Mireille Koudoufio
- Research Centre, CHU Sainte-Justine, Université de Montréal, 3175 Ste Catherine Road, Montreal, QC, H3T 1C5, Canada.,Department of Nutrition, Université de Montréal, Montreal, QC, H3T 1A8, Canada.,Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC, G1V 0A6, Canada
| | - Francis Feldman
- Research Centre, CHU Sainte-Justine, Université de Montréal, 3175 Ste Catherine Road, Montreal, QC, H3T 1C5, Canada.,Department of Nutrition, Université de Montréal, Montreal, QC, H3T 1A8, Canada.,Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC, G1V 0A6, Canada
| | - Lena Ahmarani
- Research Centre, CHU Sainte-Justine, Université de Montréal, 3175 Ste Catherine Road, Montreal, QC, H3T 1C5, Canada.,Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC, G1V 0A6, Canada
| | - Edgard Delvin
- Research Centre, CHU Sainte-Justine, Université de Montréal, 3175 Ste Catherine Road, Montreal, QC, H3T 1C5, Canada.,Department of Biochemistry, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Schohraya Spahis
- Research Centre, CHU Sainte-Justine, Université de Montréal, 3175 Ste Catherine Road, Montreal, QC, H3T 1C5, Canada.,Department of Nutrition, Université de Montréal, Montreal, QC, H3T 1A8, Canada.,Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC, G1V 0A6, Canada
| | - Yves Desjardins
- Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC, G1V 0A6, Canada
| | - Emile Levy
- Research Centre, CHU Sainte-Justine, Université de Montréal, 3175 Ste Catherine Road, Montreal, QC, H3T 1C5, Canada. .,Department of Nutrition, Université de Montréal, Montreal, QC, H3T 1A8, Canada. .,Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC, G1V 0A6, Canada.
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7
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Mingione A, Ottaviano E, Barcella M, Merelli I, Rosso L, Armeni T, Cirilli N, Ghidoni R, Borghi E, Signorelli P. Cystic Fibrosis Defective Response to Infection Involves Autophagy and Lipid Metabolism. Cells 2020; 9:cells9081845. [PMID: 32781626 PMCID: PMC7463682 DOI: 10.3390/cells9081845] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/31/2020] [Accepted: 08/04/2020] [Indexed: 12/14/2022] Open
Abstract
Cystic fibrosis (CF) is a hereditary disease, with 70% of patients developing a proteinopathy related to the deletion of phenylalanine 508. CF is associated with multiple organ dysfunction, chronic inflammation, and recurrent lung infections. CF is characterized by defective autophagy, lipid metabolism, and immune response. Intracellular lipid accumulation favors microbial infection, and autophagy deficiency impairs internalized pathogen clearance. Myriocin, an inhibitor of sphingolipid synthesis, significantly reduces inflammation, promotes microbial clearance in the lungs, and induces autophagy and lipid oxidation. RNA-seq was performed in Aspergillusfumigatus-infected and myriocin-treated CF patients’ derived monocytes and in a CF bronchial epithelial cell line. Fungal clearance was also evaluated in CF monocytes. Myriocin enhanced CF patients’ monocytes killing of A. fumigatus. CF patients’ monocytes and cell line responded to infection with a profound transcriptional change; myriocin regulates genes that are involved in inflammation, autophagy, lipid storage, and metabolism, including histones and heat shock proteins whose activity is related to the response to infection. We conclude that the regulation of sphingolipid synthesis induces a metabolism drift by promoting autophagy and lipid consumption. This process is driven by a transcriptional program that corrects part of the differences between CF and control samples, therefore ameliorating the infection response and pathogen clearance in the CF cell line and in CF peripheral blood monocytes.
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Affiliation(s)
- Alessandra Mingione
- Biochemistry and Molecular Biology Laboratory, Health Science Department, University of Milan, San Paolo Hospital, 20142 Milan, Italy; (A.M.); (R.G.)
| | - Emerenziana Ottaviano
- Laboratory of Clinical Microbiology, Health Science Department, University of Milan, San Paolo Hospital, 20142 Milan, Italy; (E.O.); (M.B.); (E.B.)
| | - Matteo Barcella
- Laboratory of Clinical Microbiology, Health Science Department, University of Milan, San Paolo Hospital, 20142 Milan, Italy; (E.O.); (M.B.); (E.B.)
| | - Ivan Merelli
- National Research Council of Italy, Institute for Biomedical Technologies, Via Fratelli Cervi 93, 20090 Milan, Italy;
| | - Lorenzo Rosso
- Health Sciences Department, University of Milan, Thoracic surgery and transplantation Unit, Fondazione IRCCS Ca Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy;
| | - Tatiana Armeni
- Department of Clinical Sciences, Section of Biochemistry, Biology and Physics, Polytechnic University of Marche, 60131 Ancona, Italy;
| | - Natalia Cirilli
- Cystic Fibrosis Referral Care Center, Mother-Child Department, United Hospitals Le Torrette, 60126 Ancona, Italy;
| | - Riccardo Ghidoni
- Biochemistry and Molecular Biology Laboratory, Health Science Department, University of Milan, San Paolo Hospital, 20142 Milan, Italy; (A.M.); (R.G.)
- “Aldo Ravelli” Center for Neurotechnology and Experimental Brain Therapeutics, via Antonio di Rudinì 8, 20142 Milan, Italy
| | - Elisa Borghi
- Laboratory of Clinical Microbiology, Health Science Department, University of Milan, San Paolo Hospital, 20142 Milan, Italy; (E.O.); (M.B.); (E.B.)
| | - Paola Signorelli
- Biochemistry and Molecular Biology Laboratory, Health Science Department, University of Milan, San Paolo Hospital, 20142 Milan, Italy; (A.M.); (R.G.)
- Correspondence:
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8
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Yefimova M, Bourmeyster N, Becq F, Burel A, Lavault MT, Jouve G, Veau S, Pimentel C, Jégou B, Ravel C. Update on the cellular and molecular aspects of cystic fibrosis transmembrane conductance regulator (CFTR) and male fertility. Morphologie 2018; 103:4-10. [PMID: 30528305 DOI: 10.1016/j.morpho.2018.11.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 10/09/2018] [Accepted: 11/06/2018] [Indexed: 12/15/2022]
Abstract
CFTR protein regulates electrolyte and fluid transport in almost all tissues with exocrine function, including male reproductive tract. Mutation of CFTR gene causes cystic fibrosis (CF), which affects the function of several organs, and impairs male fertility. The role of CFTR protein in different compartments of male reproductive tract (testis, epididymis, sperm) as well as an impact of CFTR mutation(s) on male fertility phenotype is discussed in relation with the choice of optimal technique for Assisted Reproductive Techniques (ART) management.
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Affiliation(s)
- M Yefimova
- Sechenov institute of evolutionary physiology and biochemistry, Russian academy of sciences, 44M. Thorez pr, 194223 St-Petersburg, Russia; Laboratoire STIM, université de Poitiers, 1, rue Georges-Bonnet, 86022 Poitiers cedex, France; Département de gynécologie obstétrique et reproduction humaine - CECOS, CHU de Rennes, 16, boulevard de Bulgarie, 35000 Rennes, France.
| | - N Bourmeyster
- Laboratoire STIM, université de Poitiers, 1, rue Georges-Bonnet, 86022 Poitiers cedex, France.
| | - F Becq
- Laboratoire STIM, université de Poitiers, 1, rue Georges-Bonnet, 86022 Poitiers cedex, France.
| | - A Burel
- Plateforme de MRIC TEM cellulaire, BIOSIT, Université Rennes 1, 2, avenue du Pr Léon-Bernard, 35000 Rennes, France.
| | - M-T Lavault
- Plateforme de MRIC TEM cellulaire, BIOSIT, Université Rennes 1, 2, avenue du Pr Léon-Bernard, 35000 Rennes, France.
| | - G Jouve
- Département de gynécologie obstétrique et reproduction humaine - CECOS, CHU de Rennes, 16, boulevard de Bulgarie, 35000 Rennes, France.
| | - S Veau
- Département de gynécologie obstétrique et reproduction humaine - CECOS, CHU de Rennes, 16, boulevard de Bulgarie, 35000 Rennes, France.
| | - C Pimentel
- Département de gynécologie obstétrique et reproduction humaine - CECOS, CHU de Rennes, 16, boulevard de Bulgarie, 35000 Rennes, France.
| | - B Jégou
- Inserm, université Rennes, EHESP, Irset (Instiut de recherche en santé,environnement et travail)-UMR_S1085, 35000 Rennes, France; Université de Rennes 1, 2, avenue du Pr Léon-Bernard, 35000 Rennes, France.
| | - C Ravel
- Département de gynécologie obstétrique et reproduction humaine - CECOS, CHU de Rennes, 16, boulevard de Bulgarie, 35000 Rennes, France; Inserm, université Rennes, EHESP, Irset (Instiut de recherche en santé,environnement et travail)-UMR_S1085, 35000 Rennes, France; Université de Rennes 1, 2, avenue du Pr Léon-Bernard, 35000 Rennes, France.
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9
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Matos AM, Gomes-Duarte A, Faria M, Barros P, Jordan P, Amaral MD, Matos P. Prolonged co-treatment with HGF sustains epithelial integrity and improves pharmacological rescue of Phe508del-CFTR. Sci Rep 2018; 8:13026. [PMID: 30158635 PMCID: PMC6115363 DOI: 10.1038/s41598-018-31514-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 08/20/2018] [Indexed: 02/06/2023] Open
Abstract
Cystic fibrosis (CF), the most common inherited disease in Caucasians, is caused by mutations in the CFTR chloride channel, the most frequent of which is Phe508del. Phe508del causes not only intracellular retention and premature degradation of the mutant CFTR protein, but also defective channel gating and decreased half-life when experimentally rescued to the plasma membrane (PM). Despite recent successes in the functional rescue of several CFTR mutations with small-molecule drugs, the folding-corrector/gating-potentiator drug combinations approved for Phe508del-CFTR homozygous patients have shown only modest benefit. Several factors have been shown to contribute to this outcome, including an unexpected intensification of corrector-rescued Phe508del-CFTR PM instability after persistent co-treatment with potentiator drugs. We have previously shown that acute co-treatment with hepatocyte growth factor (HGF) can significantly enhance the chemical correction of Phe508del-CFTR. HGF coaxes the anchoring of rescued channels to the actin cytoskeleton via induction of RAC1 GTPase signalling. Here, we demonstrate that a prolonged, 15-day HGF treatment also significantly improves the functional rescue of Phe508del-CFTR by the VX-809 corrector/VX-770 potentiator combination, in polarized bronchial epithelial monolayers. Importantly, we found that HGF treatment also prevented VX-770-mediated destabilization of rescued Phe508del-CFTR and enabled further potentiation of the rescued channels. Most strikingly, prolonged HGF treatment prevented previously unrecognized epithelial dedifferentiation effects of sustained exposure to VX-809. This was observed in epithelium-like monolayers from both lung and intestinal origin, representing the two systems most affected by adverse symptoms in patients treated with VX-809 or the VX-809/VX-770 combination. Taken together, our findings strongly suggest that co-administration of HGF with corrector/potentiator drugs could be beneficial for CF patients.
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Affiliation(s)
- Ana M Matos
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Av. Padre Cruz, 1649-016, Lisboa, Portugal.,University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal
| | - Andreia Gomes-Duarte
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Av. Padre Cruz, 1649-016, Lisboa, Portugal.,University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal
| | - Márcia Faria
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Av. Padre Cruz, 1649-016, Lisboa, Portugal.,University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal.,Serviço de Endocrinologia, Diabetes e Metabolismo, do CHLN - Hospital Santa Maria, Lisboa, Portugal
| | - Patrícia Barros
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Av. Padre Cruz, 1649-016, Lisboa, Portugal.,University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal
| | - Peter Jordan
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Av. Padre Cruz, 1649-016, Lisboa, Portugal.,University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal
| | - Margarida D Amaral
- University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal
| | - Paulo Matos
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Av. Padre Cruz, 1649-016, Lisboa, Portugal. .,University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande - C8, 1749-016, Lisboa, Portugal.
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10
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CFTR Deletion Confers Mitochondrial Dysfunction and Disrupts Lipid Homeostasis in Intestinal Epithelial Cells. Nutrients 2018; 10:nu10070836. [PMID: 29954133 PMCID: PMC6073936 DOI: 10.3390/nu10070836] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 06/23/2018] [Accepted: 06/25/2018] [Indexed: 02/07/2023] Open
Abstract
Background: Cystic Fibrosis (CF) is a genetic disease in which the intestine exhibits oxidative and inflammatory markers. As mitochondria are the central source and the main target of reactive oxygen species, we hypothesized that cystic fibrosis transmembrane conductance regulator (CFTR) defect leads to the disruption of cellular lipid homeostasis, which contributes to mitochondrial dysfunction. Methods. Mitochondrial functions and lipid metabolism were investigated in Caco-2/15 cells with CFTR knockout (CFTR-/-) engineered by the zinc finger nuclease technique. Experiments were performed under basal conditions and after the addition of the pro-oxidant iron-ascorbate (Fe/Asc) complex. Results. Mitochondria of intestinal cells with CFTR-/-, spontaneously showed an altered redox homeostasis characterised by a significant decrease in the expression of PPARα and nuclear factor like 2. Consistent with these observations, 8-oxoguanine-DNA glycosylase, responsible for repair of ROS-induced DNA lesion, was weakly expressed in CFTR-/- cells. Moreover, disturbed fatty acid β-oxidation process was evidenced by the reduced expression of CPT1 and acyl-CoA dehydrogenase long-chain in CFTR-/- cells. The decline of mitochondrial cytochrome c and B-cell lymphoma 2 expression pointing to magnified apoptosis. Mitochondrial respiration was also affected as demonstrated by the low expression of respiratory oxidative phosphorylation (OXPHOS) complexes and a high adenosine diphosphate/adenosine triphosphate ratio. In contrast, the FAS and ACC enzymes were markedly increased, thereby indicating lipogenesis stimulation. This was associated with an augmented secretion of lipids, lipoproteins and apolipoproteins in CFTR-/- cells. The addition of Fe/Asc worsened while butylated hydroxy toluene partially improved these processes. Conclusions: CFTR silencing results in lipid homeostasis disruption and mitochondrial dysfunction in intestinal epithelial cells. Further investigation is needed to elucidate the mechanisms underlying the marked abnormalities in response to CFTR deletion.
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11
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Massip-Copiz MM, Clauzure M, Valdivieso ÁG, Santa-Coloma TA. CFTR impairment upregulates c-Src activity through IL-1β autocrine signaling. Arch Biochem Biophys 2017; 616:1-12. [PMID: 28088327 DOI: 10.1016/j.abb.2017.01.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 01/06/2017] [Accepted: 01/09/2017] [Indexed: 12/24/2022]
Abstract
Cystic Fibrosis (CF) is a disease caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. Previously, we found several genes showing a differential expression in CFDE cells (epithelial cells derived from a CF patient). One corresponded to c-Src; its expression and activity was found increased in CFDE cells, acting as a signaling molecule between the CFTR activity and MUC1 overexpression. Here we report that bronchial IB3-1 cells (CF cells) also showed increased c-Src activity compared to 'CFTR-corrected' S9 cells. In addition, three different Caco-2 cell lines, each stably transfected with a different CFTR-specific shRNAs, displayed increased c-Src activity. The IL-1β receptor antagonist IL1RN reduced the c-Src activity of Caco-2/pRS26 cells (expressing a CFTR-specific shRNA). In addition, increased mitochondrial and cellular ROS levels were detected in Caco-2/pRS26 cells. ROS levels were partially reduced by incubation with PP2 (c-Src inhibitor) or IL1RN, and further reduced by using the NOX1/4 inhibitor GKT137831. Thus, IL-1β→c-Src and IL-1β→NOX signaling pathways appear to be responsible for the production of cellular and mitochondrial ROS in CFTR-KD cells. In conclusion, IL-1β constitutes a new step in the CFTR signaling pathway, located upstream of c-Src, which is stimulated in cells with impaired CFTR activity.
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Affiliation(s)
- María Macarena Massip-Copiz
- Laboratory of Cellular and Molecular Biology, Institute for Biomedical Research (BIOMED), School of Medical Sciences, Pontifical Catholic University of Argentina (UCA), National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina
| | - Mariángeles Clauzure
- Laboratory of Cellular and Molecular Biology, Institute for Biomedical Research (BIOMED), School of Medical Sciences, Pontifical Catholic University of Argentina (UCA), National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina
| | - Ángel Gabriel Valdivieso
- Laboratory of Cellular and Molecular Biology, Institute for Biomedical Research (BIOMED), School of Medical Sciences, Pontifical Catholic University of Argentina (UCA), National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina
| | - Tomás Antonio Santa-Coloma
- Laboratory of Cellular and Molecular Biology, Institute for Biomedical Research (BIOMED), School of Medical Sciences, Pontifical Catholic University of Argentina (UCA), National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina.
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12
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Yefimova MG, Béré E, Cantereau-Becq A, Harnois T, Meunier AC, Messaddeq N, Becq F, Trottier Y, Bourmeyster N. Myelinosomes act as natural secretory organelles in Sertoli cells to prevent accumulation of aggregate-prone mutant Huntingtin and CFTR. Hum Mol Genet 2016; 25:4170-4185. [DOI: 10.1093/hmg/ddw251] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/16/2016] [Accepted: 07/18/2016] [Indexed: 01/06/2023] Open
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13
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Morin G, Orlando V, St-Martin Crites K, Patey N, Mailhot G. Vitamin D attenuates inflammation in CFTR knockdown intestinal epithelial cells but has no effect in cells with intact CFTR. Am J Physiol Gastrointest Liver Physiol 2016; 310:G539-49. [PMID: 26893158 DOI: 10.1152/ajpgi.00060.2015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 01/31/2016] [Indexed: 01/31/2023]
Abstract
The cystic fibrosis (CF) intestine is characterized by chronic inflammation. CF patients are instructed to ingest supplemental vitamin D on a daily basis thereby exposing their intestinal tract to pharmacological amounts of this vitamin. It has been shown that vitamin D exerts intestinal anti-inflammatory properties. We therefore postulate that vitamin D may be beneficial in the management of CF intestinal inflammation by attenuating cellular inflammatory responses. In this study, we investigated the anti-inflammatory effects of the oral form of vitamin D3 (cholecalciferol) and its metabolites, 25-hydroxyvitamin D3 and 1,25-dihydroxyvitamin D3, on cytokine-induced inflammatory responses in intestinal epithelial Caco-2/15 cells with intact expression of CF transmembrane conductance regulator (CFTR) and knockdown for CFTR. We show that 25-hydroxyvitamin D3 and 1,25-dihydroxyvitamin D3 inhibited p38MAPK phosphorylation and that these effects were not mediated by changes in the expression of MAPK phosphatase-1 (MKP-1). However, 1,25-dihydroxyvitamin D3 exhibited superior anti-inflammatory effects as it furthermore reduced cytokine-induced NF-κB nuclear translocation and interleukin-8 mRNA stability and secretion. Intriguingly, the anti-inflammatory effects of vitamin D metabolites were only observed in CFTR knockdown cells, which may be explained by alterations in its catabolism associated with changes in CYP24A1 expression. These observations were supported in vivo whereby Cftr(-/-) mice fed large amounts of vitamin D3 for 2 mo led to a reduction in the number of eosinophils and apoptotic cells in the duodenal mucosa of females but not males. Altogether, these findings suggest that vitamin D exerts intestinal anti-inflammatory actions under specific circumstances and may thus prove beneficial in CF.
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Affiliation(s)
- Geneviève Morin
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Valérie Orlando
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | | | - Natacha Patey
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Geneviève Mailhot
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and Department of Nutrition, Université de Montréal, Montréal, Quebec, Canada
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14
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Kleme ML, Sané AT, Garofalo C, Levy E. Targeted CFTR gene disruption with zinc-finger nucleases in human intestinal epithelial cells induces oxidative stress and inflammation. Int J Biochem Cell Biol 2016; 74:84-94. [PMID: 26923293 DOI: 10.1016/j.biocel.2016.02.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 02/14/2016] [Accepted: 02/23/2016] [Indexed: 12/18/2022]
Abstract
UNLABELLED Cystic fibrosis (CF) is a multisystemic pathology caused by mutations of the CF transmembrane conductance regulator (CFTR) gene. OBJECTIVES As the intestine harbors the greatest number of CFTR transcripts after birth and since CFTR plays a role in glutathione transport, we hypothesized that CFTR deletion might produce oxidative stress (OxS) and inflammation in CF intestinal epithelial cell. METHODS CFTR gene was abrogated in Caco-2/15 enterocytes through the zinc-finger nuclease system. Their oxidative and inflammatory characteristics were appreciated under basal conditions and after the treatment with the pro-oxidant iron-ascorbate (Fe/Asc) complex and pro-inflammatory lipopolysaccharide (LPS). RESULTS Intestinal epithelial cells with CFTR knockout spontaneously exhibited an increased lipid peroxidation level, reflected by malondialdehyde overproduction and reduced antioxidant defense characterized by low enzymatic activities of glutathione peroxidase and catalase. CFTR silencing also resulted in elevated protein expression of pro-inflammatory tumor necrosis Factor-α, interleukin-6, cyclooxygenase-2, and the transcription factor nuclear factor-κB. Moreover, exaggerated OxS and inflammation processes occurred in CFTR(-/-) cells in response to the addition of Fe/Asc and LPS, respectively. CONCLUSIONS Intestinal Caco-2/15 cells with CFTR deletion, display innate oxidative and inflammatory features while being more sensitive to pro-oxidant and pro-inflammatory stimuli. These two pathophysiological processes could be implicated in CF-related intestinal disorders.
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Affiliation(s)
- Marie-Laure Kleme
- Research Centre, CHU Sainte-Justine, 3175 Sainte-Catherine Road, Montreal, Quebec H3T 1C4, Canada; Department of Nutrition, Université de Montréal, Montreal, Quebec H3T 1C5, Canada
| | - Alain Théophile Sané
- Research Centre, CHU Sainte-Justine, 3175 Sainte-Catherine Road, Montreal, Quebec H3T 1C4, Canada
| | - Carole Garofalo
- Research Centre, CHU Sainte-Justine, 3175 Sainte-Catherine Road, Montreal, Quebec H3T 1C4, Canada
| | - Emile Levy
- Research Centre, CHU Sainte-Justine, 3175 Sainte-Catherine Road, Montreal, Quebec H3T 1C4, Canada; Department of Nutrition, Université de Montréal, Montreal, Quebec H3T 1C5, Canada.
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15
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Ntimbane T, Mailhot G, Spahis S, Rabasa-Lhoret R, Kleme ML, Melloul D, Brochiero E, Berthiaume Y, Levy E. CFTR silencing in pancreatic β-cells reveals a functional impact on glucose-stimulated insulin secretion and oxidative stress response. Am J Physiol Endocrinol Metab 2016; 310:E200-12. [PMID: 26625901 DOI: 10.1152/ajpendo.00333.2015] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 11/21/2015] [Indexed: 02/05/2023]
Abstract
Cystic fibrosis (CF)-related diabetes (CFRD) has become a critical complication that seriously affects the clinical outcomes of CF patients. Although CFRD has emerged as the most common nonpulmonary complication of CF, little is known about its etiopathogenesis. Additionally, whether oxidative stress (OxS), a common feature of CF and diabetes, influences CFRD pathophysiology requires clarification. The main objective of this study was to shed light on the role of the cystic fibrosis transmembrane conductance regulator (CFTR) in combination with OxS in insulin secretion from pancreatic β-cells. CFTR silencing was accomplished in MIN6 cells by stable expression of small hairpin RNAs (shRNA), and glucose-induced insulin secretion was evaluated in the presence and absence of the valuable prooxidant system iron/ascorbate (Fe/Asc; 0.075/0.75 mM) along with or without the antioxidant Trolox (1 mM). Insulin output from CFTR-silenced MIN6 cells was significantly reduced (∼ 70%) at basal and at different glucose concentrations compared with control Mock cells. Furthermore, CFTR silencing rendered MIN6 cells more sensitive to OxS as evidenced by both increased lipid peroxides and weakened antioxidant defense, especially following incubation with Fe/Asc. The decreased insulin secretion in CFTR-silenced MIN6 cells was associated with high levels of NF-κB (the major participant in inflammatory responses), raised apoptosis, and diminished ATP production in response to the Fe/Asc challenge. However, these defects were alleviated by the addition of Trolox, thereby pointing out the role of OxS in aggravating the effects of CFTR deficiency. Our findings indicate that CFTR deficiency in combination with OxS may contribute to endocrine cell dysfunction and insulin secretion, which at least in part may explain the development of CFRD.
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Affiliation(s)
- Thierry Ntimbane
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada
| | - Geneviève Mailhot
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Schohraya Spahis
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Remi Rabasa-Lhoret
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada; Institut de Recherches Cliniques de Montréal, Université de Montréal, Montréal, Quebec, Canada
| | - Marie-Laure Kleme
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Danielle Melloul
- Department of Endocrinology, Hadassah University Hospital, Jerusalem, Israel; and
| | | | - Yves Berthiaume
- Institut de Recherches Cliniques de Montréal, Université de Montréal, Montréal, Quebec, Canada; Department of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - Emile Levy
- Research Centre, Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada;
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16
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Fader KA, Nault R, Ammendolia DA, Harkema JR, Williams KJ, Crawford RB, Kaminski NE, Potter D, Sharratt B, Zacharewski TR. 2,3,7,8-Tetrachlorodibenzo-p-Dioxin Alters Lipid Metabolism and Depletes Immune Cell Populations in the Jejunum of C57BL/6 Mice. Toxicol Sci 2015; 148:567-80. [PMID: 26377647 PMCID: PMC5009443 DOI: 10.1093/toxsci/kfv206] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a potent aryl hydrocarbon receptor agonist that elicits dose-dependent hepatic fat accumulation and inflammation that can progress to steatohepatitis. To investigate intestine-liver interactions that contribute to TCDD-elicited steatohepatitis, we examined the dose-dependent effects of TCDD (0.01, 0.03, 0.1, 0.3, 1, 3, 10, or 30 µg/kg) on jejunal epithelial gene expression in C57BL/6 mice orally gavaged every 4 days for 28 days. Agilent 4x44K whole-genome microarray analysis of the jejunal epithelium identified 439 differentially expressed genes (|fold change| ≥ 1.5, P1(t) ≥ 0.999) across 1 or more doses, many related to lipid metabolism and immune system processes. TCDD-elicited differentially expressed genes were associated with lipolysis, fatty acid/cholesterol absorption and transport, the Kennedy pathway, and retinol metabolism, consistent with increased hepatic fat accumulation. Moreover, several major histocompatibility complex (MHC) class II genes (H2-Aa, H2-Ab1, H2-DMb1, Cd74) were repressed, coincident with decreased macrophage and dendritic cell levels in the lamina propria, suggesting migration of antigen-presenting cells out of the intestine. In contrast, hepatic RNA-Seq analysis identified increased expression of MHC class II genes, as well as chemokines and chemokine receptors involved in macrophage recruitment (Ccr1, Ccr5, Ccl5, Cx3cr1), consistent with hepatic F4/80 labeling and macrophage infiltration into the liver. Collectively, these results suggest TCDD elicits changes that support hepatic lipid accumulation, macrophage migration, and the progression of hepatic steatosis to steatohepatitis.
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Affiliation(s)
- Kelly A Fader
- *Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824; Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824
| | - Rance Nault
- *Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824; Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824
| | - Dustin A Ammendolia
- *Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824
| | - Jack R Harkema
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824; Department of Pathobiology and Diagnostic Investigation, Michigan State University, East Lansing, Michigan 48824
| | - Kurt J Williams
- Department of Pathobiology and Diagnostic Investigation, Michigan State University, East Lansing, Michigan 48824
| | - Robert B Crawford
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824; Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan 48824; and
| | - Norbert E Kaminski
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824; Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan 48824; and
| | - Dave Potter
- Wellington Laboratories Inc., Guelph, Ontario N1G 3M5, Canada
| | - Bonnie Sharratt
- Wellington Laboratories Inc., Guelph, Ontario N1G 3M5, Canada
| | - Timothy R Zacharewski
- *Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824; *Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824;
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17
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Crites KSM, Morin G, Orlando V, Patey N, Cantin C, Martel J, Brochiero E, Mailhot G. CFTR Knockdown induces proinflammatory changes in intestinal epithelial cells. JOURNAL OF INFLAMMATION-LONDON 2015; 12:62. [PMID: 26549988 PMCID: PMC4636765 DOI: 10.1186/s12950-015-0107-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 11/05/2015] [Indexed: 12/20/2022]
Abstract
Background Hyperinflammation is a hallmark feature of cystic fibrosis (CF) airways. However, inflammation has also been documented systemically and, more recently, in extrapulmonary CF-affected tissues such as the pancreas and intestine. The pathogenesis of CF-related inflammation and more specifically the role of the cystic fibrosis transmembrane conductance regulator (CFTR) in that respect are not entirely understood. We have tested the hypothesis that genetic depletion of CFTR will affect the inflammatory status of human intestinal epithelial cell lines. Methods CFTR expression was genetically depleted from Caco-2/15 and HT-29 cells using short hairpin RNA interference (shRNAi). Inflammatory conditions were induced by the addition of human recombinant tumor necrosis factor (TNF) or Interleukin-1β (IL-1β) for various periods of time. Gene expression, mRNA stability and secreted levels of interleukin (IL)-6, −8 and 10 were assessed. Analysis of pro- and anti-inflammatory signaling pathways including mitogen-activated protein kinases (p38, ERK 1/2 and JNK), nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor alpha (IκBα), and nuclear factor-kappa B (NF-κB) was also performed. Eosinophils were counted in the jejunal mucosa of Cftr−/− and Cftr+/+ mice. Results CFTR gene and protein knockdown caused a significant increase in basal secretion of IL-8 as well as in IL-1β-induced secretion of IL-6 and −8. Release of the anti-inflammatory cytokine, IL-10, remained unaffected by CFTR depletion. The enhanced secretion of IL-8 stems in part from increased IL8 mRNA levels and greater activation of ERK1/2 MAPK, IκBα and NF-κB in the CFTR knockdown cells. By contrast, phosphorylation levels of p38 and JNK MAPK did not differ between control and knockdown cells. We also found a higher number of infiltrating eosinophils in the jejunal mucosa of Cftr −/− females, but not males, compared to Cftr +/+ mice, thus providing in vivo support to our in vitro findings. Conclusion Collectively, these data underscore the role played by CFTR in regulating the intestinal inflammatory responses. Such findings lend support to the theory that CFTR exerts functions that may go beyond its role as a chloride channel whereby its disruption may prevent cells to optimally respond to exogenous or endogenous challenges. These observations are of particular interest to CF patients who were found to display alterations in their intestinal microbiota, thus predisposing them to pathogens that may elicit exaggerated inflammatory responses. Electronic supplementary material The online version of this article (doi:10.1186/s12950-015-0107-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Geneviève Morin
- Research Centre, CHU Sainte-Justine, 3175 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1C5 Canada
| | - Valérie Orlando
- Research Centre, CHU Sainte-Justine, 3175 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1C5 Canada
| | - Natacha Patey
- Research Centre, CHU Sainte-Justine, 3175 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1C5 Canada
| | - Catherine Cantin
- Research Centre, CHU Sainte-Justine, 3175 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1C5 Canada
| | - Judith Martel
- Research Centre, CHU Sainte-Justine, 3175 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1C5 Canada
| | - Emmanuelle Brochiero
- Research Center, CHUM, 900 Saint-Denis Street, Montreal, Quebec H2X 0A9 Canada ; Department of Medicine, Université de Montreal, 2900, Édouard-Montpetit Blvd, Montreal, Quebec H3T 1J4 Canada
| | - Geneviève Mailhot
- Research Centre, CHU Sainte-Justine, 3175 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1C5 Canada ; Department of Nutrition, Université de Montreal, 2405 Cote Sainte-Catherine Rd, Montreal, Quebec H3T 1A8 Canada
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18
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Prevention of oxidative stress, inflammation and mitochondrial dysfunction in the intestine by different cranberry phenolic fractions. Clin Sci (Lond) 2014; 128:197-212. [PMID: 25069567 DOI: 10.1042/cs20140210] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cranberry fruit has been reported to have high antioxidant effectiveness that is potentially linked to its richness in diversified polyphenolic content. The aim of the present study was to determine the role of cranberry polyphenolic fractions in oxidative stress (OxS), inflammation and mitochondrial functions using intestinal Caco-2/15 cells. The combination of HPLC and UltraPerformance LC®-tandem quadrupole (UPLC-TQD) techniques allowed us to characterize the profile of low, medium and high molecular mass polyphenolic compounds in cranberry extracts. The medium molecular mass fraction was enriched with flavonoids and procyanidin dimers whereas procyanidin oligomers (DP > 4) were the dominant class of polyphenols in the high molecular mass fraction. Pre-incubation of Caco-2/15 cells with these cranberry extracts prevented iron/ascorbate-mediated lipid peroxidation and counteracted lipopolysaccharide-mediated inflammation as evidenced by the decrease in pro-inflammatory cytokines (TNF-α and interleukin-6), cyclo-oxygenase-2 and prostaglandin E2. Cranberry polyphenols (CP) fractions limited both nuclear factor κB activation and Nrf2 down-regulation. Consistently, cranberry procyanidins alleviated OxS-dependent mitochondrial dysfunctions as shown by the rise in ATP production and the up-regulation of Bcl-2, as well as the decline of protein expression of cytochrome c and apoptotic-inducing factor. These mitochondrial effects were associated with a significant stimulation of peroxisome-proliferator-activated receptor γ co-activator-1-α, a central inducing factor of mitochondrial biogenesis and transcriptional co-activator of numerous downstream mediators. Finally, cranberry procyanidins forestalled the effect of iron/ascorbate on the protein expression of mitochondrial transcription factors (mtTFA, mtTFB1, mtTFB2). Our findings provide evidence for the capacity of CP to reduce intestinal OxS and inflammation while improving mitochondrial dysfunction.
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Grenier E, Mailhot G, Dion D, Ravid Z, Spahis S, Bendayan M, Levy E. Role of the apical and basolateral domains of the enterocyte in the regulation of cholesterol transport by a high glucose concentration. Biochem Cell Biol 2013; 91:476-86. [PMID: 24219290 DOI: 10.1139/bcb-2013-0053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
We have recently shown that a high glucose (HG) concentration raised intestinal cholesterol (CHOL) transport and metabolism in intestinal epithelial cells. The objective of the present work is to determine whether the stimulus for increased CHOL absorption by glucose originates from the apical site (corresponding to the intestinal lumen) or from the basolateral site (related to blood circulation). We tackled this issue by using differentiated Caco-2/15 cells. Only basolateral medium, supplemented with 25 mmol/L glucose, stimulated [(14)C]-CHOL uptake via the up-regulation of the critical CHOL transporter NPC1L1 protein, as confirmed by its specific ezetimibe inhibitor that abolished the rise in glucose-mediated CHOL capture. No significant changes were noted in SR-BI and CD36. Elevated CHOL uptake was associated with an increase in the transcription factors SREBP-2, LXR-β, and ChREBP, along with a fall in RXR-α. Interestingly, although the HG concentration in the apical medium caused modest changes in CHOL processing, its impact was synergetic with that of the basolateral medium. Our results suggest that HG concentration influences positively intestinal CHOL uptake when present in the basolateral medium. In addition, excessive consumption of diets containing high levels of carbohydrates may strengthen intestinal CHOL uptake in metabolic syndrome, thereby contributing to elevated levels of circulating CHOL and, consequently, the risk of developing type 2 diabetes and cardiovascular disease.
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Affiliation(s)
- Emilie Grenier
- a Research Centre, CHU Ste-Justine, 3175 Ste-Catherine Road, Montreal, QC H3T 1C5, Canada
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Précourt LP, Marcil V, Ntimbane T, Taha R, Lavoie JC, Delvin E, Seidman EG, Beaulieu JF, Levy E. Antioxidative properties of paraoxonase 2 in intestinal epithelial cells. Am J Physiol Gastrointest Liver Physiol 2012; 303:G623-34. [PMID: 22744335 PMCID: PMC3468556 DOI: 10.1152/ajpgi.00039.2012] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Paraoxonase (PON) family members seem central to a wide variety of human illnesses, but appreciation of their antioxidative function in the gastrointestinal tract is in its infancy. The major objective of the present work is to highlight the role of the ubiquitously expressed PON2 in the small intestine. With use of pLKO lentiviral vector containing short hairpin RNA (shRNA) lentivirus, PON2 expression was knocked down in intestinal Caco-2/15 cells, where antioxidative status, lipid peroxidation, and degree of inflammation were evaluated. As a consequence of PON2 inactivation in the epithelial cells, we observed 1) imbalanced primary and secondary antioxidative responses, characterized by increased superoxide dismutases and decreased catalase, 2) high concentrations of H(2)O(2) and malondialdehyde, along with low glutathione-to-glutathione disulfide ratio, 3) upregulation of TNF-α, IL-6, and monocyte chemoattractant protein-1 gene expression after induction of oxidative stress, and 4) raised level of the activation of transcription factor NF-κB, which was likely implicated in exacerbation of the inflammatory activation. These results suggest that PON2 is involved in the antioxidative and anti-inflammatory response in intestinal epithelial cells.
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Affiliation(s)
- Louis-Philippe Précourt
- 1Department of Nutrition, Research Centre, CHU-Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada;
| | - Valérie Marcil
- 2Research Institute, McGill University, Montreal, Quebec, Canada;
| | - Thierry Ntimbane
- 1Department of Nutrition, Research Centre, CHU-Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada;
| | - Rame Taha
- 1Department of Nutrition, Research Centre, CHU-Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada;
| | | | - Edgard Delvin
- 3Department of Pediatrics, Research Centre, CHU-Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; ,4Department of Biochemistry, Research Centre, CHU-Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; and
| | - Ernest G. Seidman
- 2Research Institute, McGill University, Montreal, Quebec, Canada; ,5Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Jean-François Beaulieu
- 5Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Emile Levy
- 1Department of Nutrition, Research Centre, CHU-Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada; ,5Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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Grenier E, Garofalo C, Delvin E, Levy E. Modulatory role of PYY in transport and metabolism of cholesterol in intestinal epithelial cells. PLoS One 2012; 7:e40992. [PMID: 22844422 PMCID: PMC3402548 DOI: 10.1371/journal.pone.0040992] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Accepted: 06/19/2012] [Indexed: 12/17/2022] Open
Abstract
Background Gastrointestinal peptides are involved in modulating appetite. Other biological functions attributed to them include the regulation of lipid homeostasis. However, data concerning PYY remain fragmentary. The objectives of the study were: (i) To determine the effect of PYY on intestinal transport and synthesis of cholesterol, the biogenesis of apolipoproteins (apos) and assembly of lipoproteins and (ii) To analyze whether the effects of PYY are similar according to whether cells are exposed to PYY on apical or basolateral surface. Methodology/Principal Findings Caco-2/15 cells were incubated with PYY (1–36) administered either to the apical or basolateral medium, at concentrations of 50 or 200 nM for 24 hours. De novo synthesis of cholesterol, cholesterol uptake, and assembly of lipoproteins were evaluated through the incorporation of [14C]-acetate, [14C]-cholesterol, and [14C]-oleate, respectively. Biogenesis of apos (A-I, A-IV, E, B-48 and B-100) was examined by the incorporation of [35S]-methionine. The influence of PYY on protein and mRNA levels of many key mediators of lipid metabolism was analyzed by Western blot and PCR, respectively. Our results show that PYY influenced cholesterol metabolism in Caco-2/15 cells depending on the site of PYY delivery. Apical addition of PYY significantly lowered the incorporation of [14C]-cholesterol likely via the reduction of NPC1L1, stimulated intracellular cholesterol synthesis probably through an increase in SREBP-2 expression, whereas it concomitantly increased apo A-I synthesis and decreased LDL secretion. In contrast, basolateral PYY reduced the production of chylomicrons (CM) as well as the biogenesis of apos B-48 and B-100, while lowering the expression of the transcription factors RXRα and PPAR(α,β). Conclusions/Significance PYY is capable of influencing cholesterol homeostasis in intestinal Caco-2/15 cells depending on the site delivery. Apical PYY was able to decrease cholesterol uptake via NPC1L1 downregulation, whereas basolateral PYY diminished CM output through the biogenesis decline of apos B-48 and B-100.
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Affiliation(s)
- Emilie Grenier
- Research Centre, Centre Hospitalier Universitaire (CHU) Ste-Justine, Montreal, Quebec, Canada
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Carole Garofalo
- Research Centre, Centre Hospitalier Universitaire (CHU) Ste-Justine, Montreal, Quebec, Canada
| | - Edgard Delvin
- Research Centre, Centre Hospitalier Universitaire (CHU) Ste-Justine, Montreal, Quebec, Canada
- Department of Biochemistry, Université de Montréal, Montreal, Quebec, Canada
| | - Emile Levy
- Research Centre, Centre Hospitalier Universitaire (CHU) Ste-Justine, Montreal, Quebec, Canada
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- * E-mail:
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22
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Thomson ABR, Chopra A, Clandinin MT, Freeman H. Recent advances in small bowel diseases: Part II. World J Gastroenterol 2012; 18:3353-74. [PMID: 22807605 PMCID: PMC3396188 DOI: 10.3748/wjg.v18.i26.3353] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 04/05/2012] [Accepted: 04/13/2012] [Indexed: 02/06/2023] Open
Abstract
As is the case in all areas of gastroenterology and hepatology, in 2009 and 2010 there were many advances in our knowledge and understanding of small intestinal diseases. Over 1000 publications were reviewed, and the important advances in basic science as well as clinical applications were considered. In Part II we review six topics: absorption, short bowel syndrome, smooth muscle function and intestinal motility, tumors, diagnostic imaging, and cystic fibrosis.
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Abstract
Despite the inclusion of extra vitamin D in their regimen of fat-soluble vitamin supplementation, cystic fibrosis patients remain chronically depleted of vitamin D. The persistence of suboptimal vitamin D status is often blamed on the maldigestion and malabsorption of fat. However, the mitigated success of recent clinical trials with high-dose vitamin D supplementation suggests that vitamin D bioavailability might be impaired in these patients. Given the growing understanding of the importance of this vitamin in the regulation of multiple biological functions beyond skeletal health, the present review analyzes the current literature by addressing each step of vitamin D metabolism and action in the context of this life-limiting pathology. In addition, it highlights the importance of vitamin D in relation to organs and or conditions affected by cystic fibrosis.
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Affiliation(s)
- Geneviève Mailhot
- Research Centre, CHU Sainte-Justine, Department of Nutrition, Université de Montréal, Montréal, Canada.
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24
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Time-series analysis of gene expression profiles induced by nitrosamides and nitrosamines elucidates modes of action underlying their genotoxicity in human colon cells. Toxicol Lett 2011; 207:232-41. [DOI: 10.1016/j.toxlet.2011.09.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 09/13/2011] [Accepted: 09/14/2011] [Indexed: 01/21/2023]
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Kotb AM, Hierholzer A, Kemler R. Replacement of E-cadherin by N-cadherin in the mammary gland leads to fibrocystic changes and tumor formation. Breast Cancer Res 2011; 13:R104. [PMID: 22030022 PMCID: PMC3262217 DOI: 10.1186/bcr3046] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 09/21/2011] [Accepted: 10/26/2011] [Indexed: 12/15/2022] Open
Abstract
Introduction E-cadherin (E-cad; cadherin 1) and N-cadherin (N-cad; cadherin 2) are the most prominent members of the cadherin family of cell adhesion molecules. Although they share many structural and functional features, they are expressed in an almost mutually exclusive manner in vivo. Methods To explore functional differences between the two cadherins in vivo, we recently generated a knock-in line in which N-cad is expressed from the E-cad locus. In combination with a conditional gene inactivation approach, we expressed N-cad in the absence of E-cad (referred to as Ncadk.i.) in alveolar epithelial cells of the mammary gland starting in late pregnancy. Results We found that the sole presence of N-cad induces constitutively active fibroblast growth factor (Fgf) signaling and a precocious involution resulting in massive apoptosis of alveolar cells. To block apoptosis, we conditionally deleted one allele of p53 in Ncadk.i. mice and observed a temporal rescue of alveolar morphology and function. However, an accumulation of fibrotic tissue and cysts with increasing age and lactation cycles was observed. This phenotype closely resembled fibrocystic mastopathy (FM), a common disorder in humans, which is thought to precede breast cancer. Concordantly, 55% of Ncadk.i. mice harboring a heterozygous p53 deletion developed malignant and invasive tumors. Conclusions Our results demonstrate a possible role for N-cad in the formation of fibrosis and cysts in the mammary gland. Moreover, we show that these lesions precede the development of malignant tumors. Thus, we provide a new mouse model to investigate the molecular mechanisms of fibrocystic mastopathy and the transition from benign to malignant tumors.
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Affiliation(s)
- Ahmed M Kotb
- Department of Molecular Embryology, Max Planck Institute of Immunobiology and Epigenetics, Stuebeweg 51, D-79108 Freiburg, Germany
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Persistent fat malabsorption in cystic fibrosis; lessons from patients and mice. J Cyst Fibros 2011; 10:150-8. [PMID: 21459688 DOI: 10.1016/j.jcf.2011.03.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Revised: 02/07/2011] [Accepted: 03/08/2011] [Indexed: 12/13/2022]
Abstract
Fat malabsorption in pancreatic insufficient cystic fibrosis (CF) patients is classically treated with pancreatic enzyme replacement therapy (PERT). Despite PERT, intestinal fat absorption remains insufficient in most CF patients. Several factors have been suggested to contribute to the persistent fat malabsorption in CF (CFPFM). We reviewed the current insights concerning the proposed causes of CFPFM and the corresponding intervention studies. Most data are obtained from studies in CF patients and CF mice. Based on the reviewed literature, we conclude that alterations in intestinal pH and intestinal mucosal abnormalities are most likely to contribute to CFPFM. The presently available data indicate that acid suppressive drugs and broad spectrum antibiotics could be helpful in individual CF patients for optimizing fat absorption and/or nutritional status.
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Taha R, Seidman E, Mailhot G, Boudreau F, Gendron FP, Beaulieu JF, Ménard D, Delvin E, Amre D, Levy E. Oxidative stress and mitochondrial functions in the intestinal Caco-2/15 cell line. PLoS One 2010; 5:e11817. [PMID: 20676402 PMCID: PMC2910735 DOI: 10.1371/journal.pone.0011817] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Accepted: 07/02/2010] [Indexed: 12/15/2022] Open
Abstract
Background Although mitochondrial dysfunction and oxidative stress are central mechanisms in various pathological conditions, they have not been extensively studied in the gastrointestinal tract, which is known to be constantly exposed to luminal oxidants from ingested foods. Key among these is the simultaneous consumption of iron salts and ascorbic acid, which can cause oxidative damage to biomolecules. Methodology/Principal Findings The objective of the present work was to evaluate how iron-ascorbate (FE/ASC)-mediated lipid peroxidation affects mitochondrion functioning in Caco-2/15 cells. Our results show that treatment of Caco-2/15 cells with FE/ASC (0.2 mM/2 mM) (1) increased malondialdehyde levels assessed by HPLC; (2) reduced ATP production noted by luminescence assay; (3) provoked dysregulation of mitochondrial calcium homeostasis as evidenced by confocal fluorescence microscopy; (4) upregulated the protein expression of cytochrome C and apoptotic inducing factor, indicating exaggerated apoptosis; (5) affected mitochondrial respiratory chain complexes I, II, III and IV; (6) elicited mtDNA lesions as illustrated by the raised levels of 8-OHdG; (7) lowered DNA glycosylase, one of the first lines of defense against 8-OHdG mutagenicity; and (8) altered the gene expression and protein mass of mitochondrial transcription factors (mtTFA, mtTFB1, mtTFB2) without any effects on RNA Polymerase. The presence of the powerful antioxidant BHT (50 µM) prevented the occurrence of oxidative stress and most of the mitochondrial abnormalities. Conclusions/Significance Collectively, our findings indicate that acute exposure of Caco-2/15 cells to FE/ASC-catalyzed peroxidation produces harmful effects on mitochondrial functions and DNA integrity, which are abrogated by the powerful exogenous BHT antioxidant. Functional derangements of mitochondria may have implications in oxidative stress-related disorders such as inflammatory bowel diseases.
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Affiliation(s)
- Rame Taha
- Department of Nutrition, Research Center, CHU-Sainte-Justine, Université de Montréal, Montreal, Canada
| | - Ernest Seidman
- Research Institute, McGill University, Montreal, Canada
- Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Genevieve Mailhot
- Department of Nutrition, Research Center, CHU-Sainte-Justine, Université de Montréal, Montreal, Canada
| | - François Boudreau
- Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Fernand-Pierre Gendron
- Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Jean-François Beaulieu
- Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Daniel Ménard
- Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Edgard Delvin
- Department of Biochemistry, Research Center, CHU-Sainte-Justine, Université de Montréal, Montreal, Canada
| | - Devendra Amre
- Department of Pediatrics, Research Center, CHU-Sainte-Justine, Université de Montréal, Montreal, Canada
| | - Emile Levy
- Department of Nutrition, Research Center, CHU-Sainte-Justine, Université de Montréal, Montreal, Canada
- Canadian Institutes for Health Research Team on the Digestive Epithelium, Department of Anatomy and Cellular Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
- * E-mail:
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Xu Y, Krause A, Hamai H, Harvey BG, Worgall TS, Worgall S. Proinflammatory phenotype and increased caveolin-1 in alveolar macrophages with silenced CFTR mRNA. PLoS One 2010; 5:e11004. [PMID: 20543983 PMCID: PMC2882373 DOI: 10.1371/journal.pone.0011004] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 05/15/2010] [Indexed: 11/18/2022] Open
Abstract
The inflammatory milieu in the respiratory tract in cystic fibrosis (CF) has been linked to the defective expression of the cystic transmembrane regulator (CFTR) in epithelial cells. Alveolar macrophages (AM), important contibutors to inflammatory responses in the lung, also express CFTR. The present study analyzes the phenotype of human AM with silenced CFTR. Expression of CFTR mRNA and the immature form of the CFTR protein decreased 100-fold and 5.2-fold, respectively, in AM transfected with a CFTR specific siRNA (CFTR-siRNA) compared to controls. Reduction of CFTR expression in AM resulted in increased secretion of IL-8, increased phosphorylation of NF-κB, a positive regulator of IL-8 expression, and decreased expression of IκB-α, the inhibitory protein of NF-κB activation. AM with silenced CFTR expression also showed increased apoptosis. We hypothesized that caveolin-1 (Cav1), a membrane protein that is co-localized with CFTR in lipid rafts and that is related to inflammation and apoptosis in macrophages, may be affected by decreased CFTR expression. Messenger RNA and protein levels of Cav1 were increased in AM with silenced CFTR. Expression and transcriptional activity of sterol regulatory element binding protein (SREBP), a negative transcriptional regulator of Cav1, was decreased in AM with silenced CFTR, but total and free cholesterol mass did not change. These findings indicate that silencing of CFTR in human AM results in an inflammatory phenotype and apoptosis, which is associated to SREBP-mediated regulation of Cav1.
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Affiliation(s)
- Yaqin Xu
- Department of Pediatrics, Weill Cornell Medical College, New York, New York, United States of America
| | - Anja Krause
- Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, United States of America
| | - Hiroko Hamai
- Department of Pathology, Columbia University, New York, New York, United States of America
| | - Ben-Gary Harvey
- Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, United States of America
| | - Tilla S. Worgall
- Department of Pathology, Columbia University, New York, New York, United States of America
| | - Stefan Worgall
- Department of Pediatrics, Weill Cornell Medical College, New York, New York, United States of America
- Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, United States of America
- * E-mail:
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Worgall TS. Lipoprotein patterns in adult cystic fibrosis: A cause for concern or marker for survival? Respirology 2010; 15:731-2. [DOI: 10.1111/j.1440-1843.2010.01788.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Mailhot G, Rabasa-Lhoret R, Moreau A, Berthiaume Y, Levy E. CFTR depletion results in changes in fatty acid composition and promotes lipogenesis in intestinal Caco 2/15 cells. PLoS One 2010; 5:e10446. [PMID: 20463919 PMCID: PMC2864762 DOI: 10.1371/journal.pone.0010446] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2010] [Accepted: 04/11/2010] [Indexed: 12/24/2022] Open
Abstract
Background Abnormal fatty acid composition (FA) in plasma and tissue lipids frequently occurs in homozygous and even in heterozygous carriers of cystic fibrosis transmembrane conductance regulator (CFTR) mutations. The mechanism(s) underlying these abnormalities remained, however, poorly understood despite the potentially CFTR contributing role. Methodology/Principal Findings The aim of the present study was to investigate the impact of CFTR depletion on FA uptake, composition and metabolism using the intestinal Caco-2/15 cell line. shRNA-mediated cftr gene silencing induced qualitative and quantitative modifications in FA composition in differentiated enterocytes as determined by gas-liquid chromatography. With the cftr gene disruption, there was a 1,5 fold increase in the total FA amount, largely attributable to monounsaturated and saturated FA compared to controls. The activity of delta-7 desaturase, estimated by the 16:1(n-7)/16:0, was significantly higher in knockdown cells and consistent with the striking elevation of the n-7 FA family. When incubated with [14C]-oleic acid, CFTR-depleted cells were capable of quick incorporation and export to the medium concomitantly with the high protein expression of L-FABP known to promote intracellular FA trafficking. Accordingly, lipoprotein vehicles (CM, VLDL, LDL and HDL), isolated from CFTR knockdown cells, exhibited higher levels of radiolabeled FA. Moreover, in the presence of [14C]-acetate, knockdown cells exhibited enhanced secretion of newly synthesized phospholipids, triglycerides, cholesteryl esters and free FA, thereby suggesting a stimulation of the lipogenic pathway. Conformably, gene expression of SREBP-1c, a key lipogenic transcription factor, was increased while protein expression of the phosphorylated and inactive form of acetylCoA carboxylase was reduced, confirming lipogenesis induction. Finally, CFTR-depleted cells exhibited lower gene expression of transcription factors (PPARα, LXRα, LXRβ and RXRα). Conclusions/Significance Collectively, our results indicate that CFTR depletion may disrupt FA homeostasis in intestinal cells through alterations in FA uptake and transport combined with stimulation of lipogenesis that occurs by an LXR/RXR-independent mechanism. These findings exclude a contributing role of CFTR in CF-associated fat malabsorption.
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Affiliation(s)
- Geneviève Mailhot
- Research Centre, CHU Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Rémi Rabasa-Lhoret
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- Diabetes and Metabolic Diseases Research Group, Institut de Recherches Cliniques and Centre Hospitalier de l'Université de Montréal (CHUM)-Hôtel-Dieu, Université de Montréal, Montreal, Quebec, Canada
| | - Alain Moreau
- Research Centre, CHU Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada
- Department of Pediatrics, Université de Montréal, Montreal, Quebec, Canada
| | - Yves Berthiaume
- Cystic Fibrosis Clinic, Centre Hospitalier de l'Université de Montréal (CHUM)-Hôtel-Dieu, Montreal, Quebec, Canada
| | - Emile Levy
- Research Centre, CHU Sainte-Justine, Université de Montréal, Montreal, Quebec, Canada
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- * E-mail:
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