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Ng CT, Fong LY, Abdullah MNH. Interferon-gamma (IFN-γ): Reviewing its mechanisms and signaling pathways on the regulation of endothelial barrier function. Cytokine 2023; 166:156208. [PMID: 37088004 DOI: 10.1016/j.cyto.2023.156208] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/30/2023] [Accepted: 04/03/2023] [Indexed: 04/25/2023]
Abstract
Interferon-gamma (IFN-γ) is a pleiotropic cytokine that plays a critical role in mediating an array of immune responses including promotes antiviral activity, facilitates macrophage activation, controls Th1/Th2 balance, and regulates cellular apoptosis and proliferation. A few articles have previously reviewed the effects of IFN-γ in the regulation of barrier permeability, but none of these articles focuses on barrier function of endothelial cells. This review aims to discuss the regulatory mechanisms of IFN-γ on endothelial barrier function and its underlying signaling pathways. Articles were retrieved from electronic databases such as PubMed and Google Scholar using keywords "Interferon-gamma", "endothelial cells", "barrier function", and "signaling pathway". The articles published between 2000 and 2022 that are related to the aforementioned topics were selected. A few journals published beyond this period were also included due to limited information available. The results showed that IFN-γ modulates endothelial barrier function, mainly involves small GTPases, STAT1-dependent pathway, p38 MAPK and nitric oxide. In conclusion, more in depth cellular and molecular studies are needed to elucidate the pathways of IFN-γ in the regulation of endothelial barrier function.
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Affiliation(s)
- Chin Theng Ng
- Unit of Physiology, Faculty of Medicine, AIMST University, Bedong, 08100 Kedah, Malaysia.
| | - Lai Yen Fong
- Department of Pre-clinical Sciences, M. Kandiah Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Kajang, 43000 Selangor, Malaysia
| | - Muhammad Nazrul Hakim Abdullah
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, 43400 Selangor, Malaysia
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2
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The Role of Adaptive Immunity in Diabetic Retinopathy. J Clin Med 2022; 11:jcm11216499. [PMID: 36362727 PMCID: PMC9657718 DOI: 10.3390/jcm11216499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 10/29/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
Diabetic retinopathy (DR) is currently one of the common causes of vision loss in working-age adults. It is clinically diagnosed and classified according to the vascular changes in the fundus. However, the activation of immune cells occurs before these vascular changes become detectable. These, together with molecular studies and the positive clinical outcomes of anti-inflammatory treatment, highlight the pivotal involvement of the immune system. The role of innate immunity in DR pathophysiology has been studied in depth, but the contribution of adaptive immunity remains largely elusive. This review aims to summarize our current understanding of the activation mechanism of adaptive immunity in DR microenvironments and to discuss the relationship between adaptive immunity and local vascular units or innate immunity, which opens new avenues for clinical applications in DR treatment.
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Lee LYH, Oldham WM, He H, Wang R, Mulhern R, Handy DE, Loscalzo J. Interferon-γ Impairs Human Coronary Artery Endothelial Glucose Metabolism by Tryptophan Catabolism and Activates Fatty Acid Oxidation. Circulation 2021; 144:1612-1628. [PMID: 34636650 DOI: 10.1161/circulationaha.121.053960] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Endothelial cells depend on glycolysis for much of their energy production. Impaired endothelial glycolysis has been associated with various vascular pathobiologies, including impaired angiogenesis and atherogenesis. IFN-γ (interferon-γ)-producing CD4+ and CD8+ T lymphocytes have been identified as the predominant pathological cell subsets in human atherosclerotic plaques. Although the immunologic consequences of these cells have been extensively evaluated, their IFN-γ-mediated metabolic effects on endothelial cells remain unknown. The purpose of this study was to determine the metabolic consequences of the T-lymphocyte cytokine, IFN-γ, on human coronary artery endothelial cells. METHODS The metabolic effects of IFN-γ on primary human coronary artery endothelial cells were assessed by unbiased transcriptomic and metabolomic analyses combined with real-time extracellular flux analyses and molecular mechanistic studies. Cellular phenotypic correlations were made by measuring altered endothelial intracellular cGMP content, wound-healing capacity, and adhesion molecule expression. RESULTS IFN-γ exposure inhibited basal glycolysis of quiescent primary human coronary artery endothelial cells by 20% through the global transcriptional suppression of glycolytic enzymes resulting from decreased basal HIF1α (hypoxia-inducible factor 1α) nuclear availability in normoxia. The decrease in HIF1α activity was a consequence of IFN-γ-induced tryptophan catabolism resulting in ARNT (aryl hydrocarbon receptor nuclear translocator)/HIF1β sequestration by the kynurenine-activated AHR (aryl hydrocarbon receptor). In addition, IFN-γ resulted in a 23% depletion of intracellular nicotinamide adenine dinucleotide in human coronary artery endothelial cells. This altered glucose metabolism was met with concomitant activation of fatty acid oxidation, which augmented its contribution to intracellular ATP balance by >20%. These metabolic derangements were associated with adverse endothelial phenotypic changes, including decreased basal intracellular cGMP, impaired endothelial migration, and a switch to a proinflammatory state. CONCLUSIONS IFN-γ impairs endothelial glucose metabolism by altered tryptophan catabolism destabilizing HIF1, depletes nicotinamide adenine dinucleotide, and results in a metabolic shift toward increased fatty acid oxidation. This work suggests a novel mechanistic basis for pathological T lymphocyte-endothelial interactions in atherosclerosis mediated by IFN-γ, linking endothelial glucose, tryptophan, and fatty acid metabolism with the nicotinamide adenine dinucleotide balance and ATP generation and their adverse endothelial functional consequences.
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Affiliation(s)
- Laurel Yong-Hwa Lee
- Division of Cardiovascular Medicine (L.Y.-H.L., H.H., R.W., R.M., D.E.H., J.L.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - William M Oldham
- Division of Pulmonary and Critical Care (W.M.O.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Huamei He
- Division of Cardiovascular Medicine (L.Y.-H.L., H.H., R.W., R.M., D.E.H., J.L.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Ruisheng Wang
- Division of Cardiovascular Medicine (L.Y.-H.L., H.H., R.W., R.M., D.E.H., J.L.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Ryan Mulhern
- Division of Cardiovascular Medicine (L.Y.-H.L., H.H., R.W., R.M., D.E.H., J.L.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Diane E Handy
- Division of Cardiovascular Medicine (L.Y.-H.L., H.H., R.W., R.M., D.E.H., J.L.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Joseph Loscalzo
- Division of Cardiovascular Medicine (L.Y.-H.L., H.H., R.W., R.M., D.E.H., J.L.), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
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Gerardi G, Cavia-Saiz M, Rivero-Pérez MD, González-SanJosé ML, Muñiz P. The protective effects of wine pomace products on the vascular endothelial barrier function. Food Funct 2021; 11:7878-7891. [PMID: 32812564 DOI: 10.1039/d0fo01199a] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Endothelial dysfunction is associated with cardiovascular diseases and involves a chronic inflammatory process that together with oxidative stress increases the permeability of the vascular endothelium. The aim of this study was to evaluate the role of red and white wine pomace products (rWPPs and wWPPs) in the maintenance of endothelial integrity in hyperglycemia of EA.hy926 endothelial cells. EA.hy926 endothelial cells exposed to hyperglycemia were treated with the in vitro digested fractions of rWPPs and wWPPs. A Real Time Cellular Analysis (RTCA) system was used to evaluate the endothelial monolayer integrity after INF-γ stimulation of pre-treated endothelial cells with the digested fractions. The changes in cell viability, NO, ROS and NOX4 were recorded and actin cytoskeleton and E-cadherin junctions were evaluated by immunofluorescence. All digested fractions prevent the hyperglycemic actions in the cell viability and NO/ROS balance. The inflammatory mediator INF-γ and hyperglycemia caused a decrease in RTCA adhesion of the EA.hy926 endothelial cell monolayer. Pre-treatment with all digested fractions enhanced the EA.hy926 endothelial monolayer integrity and maintained actin cytoskeleton and E-cadherin junctions. These in vitro studies elucidate that the anti-hyperglycemic and anti-inflammatory actions of wine pomace products involve a decrease in ROS production and the stabilization of junction proteins via modulation of VE-cadherin and actin cytoskeleton suggesting a potential prevention of endothelial damage by these natural products.
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Affiliation(s)
- Gisela Gerardi
- Department of Biotechnology and Food Science, Faculty of Sciences, University of Burgos, Plaza Misael Bañuelos, 09001, Burgos, Spain.
| | - Mónica Cavia-Saiz
- Department of Biotechnology and Food Science, Faculty of Sciences, University of Burgos, Plaza Misael Bañuelos, 09001, Burgos, Spain.
| | - María D Rivero-Pérez
- Department of Biotechnology and Food Science, Faculty of Sciences, University of Burgos, Plaza Misael Bañuelos, 09001, Burgos, Spain.
| | - María L González-SanJosé
- Department of Biotechnology and Food Science, Faculty of Sciences, University of Burgos, Plaza Misael Bañuelos, 09001, Burgos, Spain.
| | - Pilar Muñiz
- Department of Biotechnology and Food Science, Faculty of Sciences, University of Burgos, Plaza Misael Bañuelos, 09001, Burgos, Spain.
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Langer V, Vivi E, Regensburger D, Winkler TH, Waldner MJ, Rath T, Schmid B, Skottke L, Lee S, Jeon NL, Wohlfahrt T, Kramer V, Tripal P, Schumann M, Kersting S, Handtrack C, Geppert CI, Suchowski K, Adams RH, Becker C, Ramming A, Naschberger E, Britzen-Laurent N, Stürzl M. IFN-γ drives inflammatory bowel disease pathogenesis through VE-cadherin-directed vascular barrier disruption. J Clin Invest 2020; 129:4691-4707. [PMID: 31566580 DOI: 10.1172/jci124884] [Citation(s) in RCA: 142] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 08/01/2019] [Indexed: 02/06/2023] Open
Abstract
Inflammatory bowel disease (IBD) is a chronic inflammatory disorder with rising incidence. Diseased tissues are heavily vascularized. Surprisingly, the pathogenic impact of the vasculature in IBD and the underlying regulatory mechanisms remain largely unknown. IFN-γ is a major cytokine in IBD pathogenesis, but in the context of the disease, it is almost exclusively its immune-modulatory and epithelial cell-directed functions that have been considered. Recent studies by our group demonstrated that IFN-γ also exerts potent effects on blood vessels. Based on these considerations, we analyzed the vessel-directed pathogenic functions of IFN-γ and found that it drives IBD pathogenesis through vascular barrier disruption. Specifically, we show that inhibition of the IFN-γ response in vessels by endothelial-specific knockout of IFN-γ receptor 2 ameliorates experimentally induced colitis in mice. IFN-γ acts pathogenic by causing a breakdown of the vascular barrier through disruption of the adherens junction protein VE-cadherin. Notably, intestinal vascular barrier dysfunction was also confirmed in human IBD patients, supporting the clinical relevance of our findings. Treatment with imatinib restored VE-cadherin/adherens junctions, inhibited vascular permeability, and significantly reduced colonic inflammation in experimental colitis. Our findings inaugurate the pathogenic impact of IFN-γ-mediated intestinal vessel activation in IBD and open new avenues for vascular-directed treatment of this disease.
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Affiliation(s)
- Victoria Langer
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
| | - Eugenia Vivi
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
| | - Daniela Regensburger
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
| | - Thomas H Winkler
- Division of Genetics, Nikolaus-Fiebiger-Center of Molecular Medicine
| | - Maximilian J Waldner
- Department of Medicine 1, Gastroenterology, Pneumology and Endocrinology, University Medical Center Erlangen, and
| | - Timo Rath
- Department of Medicine 1, Gastroenterology, Pneumology and Endocrinology, University Medical Center Erlangen, and
| | - Benjamin Schmid
- Optical Imaging Centre, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Lisa Skottke
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
| | - Somin Lee
- Program for Bioengineering, School of Engineering, Seoul National University, Seoul, Republic of Korea
| | - Noo Li Jeon
- Program for Bioengineering, School of Engineering, Seoul National University, Seoul, Republic of Korea
| | - Thomas Wohlfahrt
- Department of Internal Medicine 3, Rheumatology and Immunology, University Medical Center Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Viktoria Kramer
- Department of Medicine 1, Gastroenterology, Pneumology and Endocrinology, University Medical Center Erlangen, and
| | - Philipp Tripal
- Optical Imaging Centre, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Michael Schumann
- Medical Clinic I, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | | | - Carol I Geppert
- Institute of Pathology, University Medical Center Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Karina Suchowski
- Discovery Oncology, Pharmaceutical Research and Early Development (pRED), Roche Innovation Center Munich, Penzberg, Germany
| | - Ralf H Adams
- Department of Tissue Morphogenesis, Max Planck Institute for Molecular Biomedicine, Münster, Germany
| | - Christoph Becker
- Department of Medicine 1, Gastroenterology, Pneumology and Endocrinology, University Medical Center Erlangen, and
| | - Andreas Ramming
- Department of Internal Medicine 3, Rheumatology and Immunology, University Medical Center Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Elisabeth Naschberger
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
| | - Nathalie Britzen-Laurent
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
| | - Michael Stürzl
- Division of Molecular and Experimental Surgery, Translational Research Center, Department of Surgery, University Medical Center Erlangen
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Gui F, You Z, Fu S, Wu H, Zhang Y. Endothelial Dysfunction in Diabetic Retinopathy. Front Endocrinol (Lausanne) 2020; 11:591. [PMID: 33013692 PMCID: PMC7499433 DOI: 10.3389/fendo.2020.00591] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 07/20/2020] [Indexed: 12/21/2022] Open
Abstract
Diabetic retinopathy (DR) is a diabetic complication which affects retinal function and results in severe loss of vision and relevant retinal diseases. Retinal vascular dysfunction caused by multifactors, such as advanced glycosylation end products and receptors, pro-inflammatory cytokines and chemokines, proliferator-activated receptor-γ disruption, growth factors, oxidative stress, and microRNA. These factors promote retinal endothelial dysfunction, which results in the development of DR. In this review, we summarize the contributors in the pathophysiology of DR for a better understanding of the molecular and cellular mechanism in the development of DR with a special emphasis on retinal endothelial dysfunction.
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Shin Y, Choi SH, Kim E, Bylykbashi E, Kim JA, Chung S, Kim DY, Kamm RD, Tanzi RE. Blood-Brain Barrier Dysfunction in a 3D In Vitro Model of Alzheimer's Disease. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1900962. [PMID: 31637161 PMCID: PMC6794630 DOI: 10.1002/advs.201900962] [Citation(s) in RCA: 142] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/20/2019] [Indexed: 05/21/2023]
Abstract
Harmful materials in the blood are prevented from entering the healthy brain by a highly selective blood-brain barrier (BBB), and impairment of barrier function has been associated with a variety of neurological diseases. In Alzheimer's disease (AD), BBB breakdown has been shown to occur even before cognitive decline and brain pathology. To investigate the role of the cerebral vasculature in AD, a physiologically relevant 3D human neural cell culture microfluidic model is developed having a brain endothelial cell monolayer with a BBB-like phenotype. This model is shown to recapitulate several key aspects of BBB dysfunction observed in AD patients: increased BBB permeability, decreased expression of claudin-1, claudin-5, and VE-cadherin, increased expression of matrix-metalloproteinase-2 and reactive oxygen species, and deposition of β-amyloid (Aβ) peptides at the vascular endothelium. Thus, it provides a well-controlled platform for investigating BBB function as well as for screening of new drugs that need to pass the BBB to gain access to neural tissues.
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Affiliation(s)
- Yoojin Shin
- Department of Mechanical EngineeringMassachusetts Institute of Technology500 Technology Square, MIT Building, Room NE47‐321CambridgeMA02139USA
| | - Se Hoon Choi
- Genetics and Aging Research UnitMcCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA02129USA
| | - Eunhee Kim
- Genetics and Aging Research UnitMcCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA02129USA
| | - Enjana Bylykbashi
- Genetics and Aging Research UnitMcCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA02129USA
| | - Jeong Ah Kim
- Biomedical Omics GroupKorea Basic Science InstituteCheongju28119Republic of Korea
- Department of Bio‐Analytical ScienceUniversity of Science and TechnologyDaejeon34113Republic of Korea
| | - Seok Chung
- KU‐KIST Graduate School of Converging Science and TechnologyKorea UniversitySeoul02841Republic of Korea
- School of Mechanical EngineeringKorea UniversitySeoul02841Republic of Korea
| | - Doo Yeon Kim
- Genetics and Aging Research UnitMcCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA02129USA
| | - Roger D. Kamm
- Department of Mechanical EngineeringMassachusetts Institute of Technology500 Technology Square, MIT Building, Room NE47‐321CambridgeMA02139USA
- Department of Biological EngineeringMassachusetts Institute of Technology500 Technology Square, MIT Building, Room NE47‐321CambridgeMA02139USA
- Singapore‐MIT Alliance for Research & Technology (SMART)BioSystems and Micromechanics (BioSyM)Singapore138602Singapore
| | - Rudolph E. Tanzi
- Genetics and Aging Research UnitMcCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA02129USA
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Ng CT, Fong LY, Yong YK, Hakim MN, Ahmad Z. Interferon-γ induces biphasic changes in caldesmon localization as well as adherens junction organization and expression in HUVECs. Cytokine 2018; 111:541-550. [PMID: 29909980 DOI: 10.1016/j.cyto.2018.06.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 06/06/2018] [Accepted: 06/08/2018] [Indexed: 01/11/2023]
Abstract
Endothelial barrier dysfunction leads to increased endothelial permeability and is an early step in the development of vascular inflammatory diseases such as atherosclerosis. Interferon-γ (IFN-γ), a proinflammatory cytokine, is known to cause increased endothelial permeability. However, the mechanisms by which IFN-γ disrupts the endothelial barrier have not been clarified. This study aimed to investigate how IFN-γ impairs the endothelial barrier integrity by specifically examining the roles of caldesmon, adherens junctions (AJs) and p38 mitogen-activated protein (MAP) kinase in IFN-γ-induced endothelial barrier dysfunction. IFN-γ exhibited a biphasic effect on caldesmon localization and both the structural organization and protein expression of AJs. In the early phase (4-8 h), IFN-γ induced the formation of peripheral caldesmon bands and discontinuous AJs, while AJ protein expression was unchanged. Interestingly, IFN-γ also stimulated caldesmon phosphorylation, resulting in actin dissociation from caldesmon at 8 h. Conversely, changes seen in the late phase (16-24 h) included cytoplasmic caldesmon dispersal, AJ linearization and junctional area reduction, which were associated with reduced membrane, cytoskeletal and total AJ protein expression. In addition, IFN-γ enhanced myosin binding to caldesmon at 12 h and persisted up to 24 h. Furthermore, inhibition of p38 MAP kinase by SB203580 did not reverse either the early or late phase changes observed. These data suggest that IFN-γ may activate signaling molecules other than p38 MAP kinase. In conclusion, our findings enhance the current understanding of how IFN-γ disrupts endothelial barrier function and reveal potential therapeutic targets, such as caldesmon and AJs, for the treatment of IFN-γ-associated vascular inflammatory diseases.
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Affiliation(s)
- Chin Theng Ng
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia; Physiology Unit, Faculty of Medicine, AIMST University, 08100 Bedong, Kedah, Malaysia.
| | - Lai Yen Fong
- Department of Pre-clinical Sciences, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, 43000 Kajang, Selangor, Malaysia.
| | - Yoke Keong Yong
- Department of Human Anatomy, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
| | - Muhammad Nazrul Hakim
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
| | - Zuraini Ahmad
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
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Bekusova VV, Falchuk EL, Okorokova LS, Kruglova NM, Nozdrachev AD, Markov AG. Increased paracellular permeability of tumor-adjacent areas in 1,2-dimethylhydrazine-induced colon carcinogenesis in rats. Cancer Biol Med 2018; 15:251-259. [PMID: 30197792 PMCID: PMC6121046 DOI: 10.20892/j.issn.2095-3941.2018.0016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Objective: The morphology and functions of the proximal and distal large intestine are not the same. The incidence of colorectal cancer in these regions is also different, as tumors more often appear in the descending colon than in the ascending colon. Inflammatory bowel disease and colorectal cancer can increase transepithelial permeability, which is a sign of reduced intestinal barrier function. However, there is not enough evidence to establish a connection between the difference in colorectal cancer incidence in the proximal and distal colon and intestinal permeability or the effects of carcinogenesis on the barrier properties in various areas of the colon. The aim of the study was to assess the permeability of different segments of the large intestine according to a developed mapping methodology in healthy rats and rats with 1,2-dimethylhydrazine (DMH)-induced colon adenocarcinoma. Methods: The short circuit current, the transepithelial electrical resistance and the paracellular permeability to fluorescein of large intestine wall of male Wistar rats were examined in the Ussing chambers. The optical density of the solution from the serosa side to assess the concentration of the diffused fluorescein from mucosa to serosa was analyzed by spectrophotometry. The morphometric and histological studies were performed by optical microscopy. Results: Rats with DMH-induced colon adenocarcinomas showed elevated transepithelial electrical resistance in the areas of neoplasm development. In contrast, there was no change in the electrophysiological properties of tumor adjacent areas, however, the paracellular permeability of these areas to fluorescein was increased compared to the control rats and was characterized by sharply reduced barrier function. Conclusions: The barrier properties of the colon vary depending on tumor location. The tumors were less permeable than the intact intestinal wall and probably have a negative influence on tumor-adjacent tissues by disrupting their barrier function.
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Affiliation(s)
- Viktoria V Bekusova
- Department of Physiology, St. Petersburg State University, St. Petersburg 197183, Russia
| | - Evgeny L Falchuk
- Department of Physiology, St. Petersburg State University, St. Petersburg 197183, Russia
| | - Larisa S Okorokova
- Department of Physiology, St. Petersburg State University, St. Petersburg 197183, Russia
| | - Natalia M Kruglova
- Department of Physiology, St. Petersburg State University, St. Petersburg 197183, Russia
| | - Alexander D Nozdrachev
- Department of Physiology, St. Petersburg State University, St. Petersburg 197183, Russia.,I.P.Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg 199034, Russia
| | - Alexander G Markov
- Department of Physiology, St. Petersburg State University, St. Petersburg 197183, Russia
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