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Erramilli SK, Dominik PK, Ogbu CP, Kossiakoff AA, Vecchio AJ. Structural and biophysical insights into targeting of claudin-4 by a synthetic antibody fragment. Commun Biol 2024; 7:733. [PMID: 38886509 PMCID: PMC11183071 DOI: 10.1038/s42003-024-06437-6] [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: 01/04/2024] [Accepted: 06/11/2024] [Indexed: 06/20/2024] Open
Abstract
Claudins are a 27-member family of ~25 kDa membrane proteins that integrate into tight junctions to form molecular barriers at the paracellular spaces between endothelial and epithelial cells. As the backbone of tight junction structure and function, claudins are attractive targets for modulating tissue permeability to deliver drugs or treat disease. However, structures of claudins are limited due to their small sizes and physicochemical properties-these traits also make therapy development a challenge. Here we report the development of a synthetic antibody fragment (sFab) that binds human claudin-4 and the determination of a high-resolution structure of it bound to claudin-4/enterotoxin complexes using cryogenic electron microscopy. Structural and biophysical results reveal this sFabs mechanism of select binding to human claudin-4 over other homologous claudins and establish the ability of sFabs to bind hard-to-target claudins to probe tight junction structure and function. The findings provide a framework for tight junction modulation by sFabs for tissue-selective therapies.
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Affiliation(s)
- Satchal K Erramilli
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, 60637, USA
| | - Pawel K Dominik
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, 60637, USA
- Pfizer, San Diego, CA, 92121, USA
| | - Chinemerem P Ogbu
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
- Department of Structural Biology, University at Buffalo, Buffalo, NY, 14203, USA
| | - Anthony A Kossiakoff
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, 60637, USA
| | - Alex J Vecchio
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
- Department of Structural Biology, University at Buffalo, Buffalo, NY, 14203, USA.
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2
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Ebrahim T, Ebrahim AS, Kandouz M. Diversity of Intercellular Communication Modes: A Cancer Biology Perspective. Cells 2024; 13:495. [PMID: 38534339 DOI: 10.3390/cells13060495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/27/2024] [Accepted: 03/10/2024] [Indexed: 03/28/2024] Open
Abstract
From the moment a cell is on the path to malignant transformation, its interaction with other cells from the microenvironment becomes altered. The flow of molecular information is at the heart of the cellular and systemic fate in tumors, and various processes participate in conveying key molecular information from or to certain cancer cells. For instance, the loss of tight junction molecules is part of the signal sent to cancer cells so that they are no longer bound to the primary tumors and are thus free to travel and metastasize. Upon the targeting of a single cell by a therapeutic drug, gap junctions are able to communicate death information to by-standing cells. The discovery of the importance of novel modes of cell-cell communication such as different types of extracellular vesicles or tunneling nanotubes is changing the way scientists look at these processes. However, are they all actively involved in different contexts at the same time or are they recruited to fulfill specific tasks? What does the multiplicity of modes mean for the overall progression of the disease? Here, we extend an open invitation to think about the overall significance of these questions, rather than engage in an elusive attempt at a systematic repertory of the mechanisms at play.
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Affiliation(s)
- Thanzeela Ebrahim
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI 48202, USA
| | - Abdul Shukkur Ebrahim
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48202, USA
| | - Mustapha Kandouz
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI 48202, USA
- Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48202, USA
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3
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Legere EA, Baumholtz AI, Lachance JFB, Archer M, Piontek J, Ryan AK. Claudin-3 in the non-neural ectoderm is essential for neural fold fusion in chicken embryos. Dev Biol 2024; 507:20-33. [PMID: 38154769 DOI: 10.1016/j.ydbio.2023.12.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/08/2023] [Accepted: 12/21/2023] [Indexed: 12/30/2023]
Abstract
The neural tube, the embryonic precursor to the brain and spinal cord, begins as a flat sheet of epithelial cells, divided into non-neural and neural ectoderm. Proper neural tube closure requires that the edges of the neural ectoderm, the neural folds, to elevate upwards and fuse along the dorsal midline of the embryo. We have previously shown that members of the claudin protein family are required for the early phases of chick neural tube closure. Claudins are transmembrane proteins, localized in apical tight junctions within epithelial cells where they are essential for regulation of paracellular permeability, strongly involved in apical-basal polarity, cell-cell adhesion, and bridging the tight junction to cytoplasmic proteins. Here we explored the role of Claudin-3 (Cldn3), which is specifically expressed in the non-neural ectoderm. We discovered that depletion of Cldn3 causes folic acid-insensitive primarily spinal neural tube defects due to a failure in neural fold fusion. Apical cell surface morphology of Cldn3-depleted non-neural ectodermal cells exhibited increased membrane blebbing and smaller apical surfaces. Although apical-basal polarity was retained, we observed altered Par3 and Pals1 protein localization patterns within the apical domain of the non-neural ectodermal cells in Cldn3-depleted embryos. Furthermore, F-actin signal was reduced at apical junctions. Our data presents a model of spina bifida, and the role that Cldn3 is playing in regulating essential apical cell processes in the non-neural ectoderm required for neural fold fusion.
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Affiliation(s)
- Elizabeth-Ann Legere
- Department of Human Genetics, McGill University, Canada; The Research Institute of the McGill University Health Center, Montreal, Quebec, Canada.
| | - Amanda I Baumholtz
- Department of Human Genetics, McGill University, Canada; The Research Institute of the McGill University Health Center, Montreal, Quebec, Canada.
| | | | | | - Jörg Piontek
- Clinical Physiology/Nutritional Medicine, Department of Gastroenterology, Rheumatology and Infectious Diseases, Charité-Universitätsmedizin Berlin, Berlin, Germany.
| | - Aimee K Ryan
- Department of Human Genetics, McGill University, Canada; The Research Institute of the McGill University Health Center, Montreal, Quebec, Canada.
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Szabó K, Bolla BS, Erdei L, Balogh F, Kemény L. Are the Cutaneous Microbiota a Guardian of the Skin's Physical Barrier? The Intricate Relationship between Skin Microbes and Barrier Integrity. Int J Mol Sci 2023; 24:15962. [PMID: 37958945 PMCID: PMC10647730 DOI: 10.3390/ijms242115962] [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: 08/23/2023] [Revised: 10/31/2023] [Accepted: 11/01/2023] [Indexed: 11/15/2023] Open
Abstract
The skin is a tightly regulated, balanced interface that maintains our integrity through a complex barrier comprising physical or mechanical, chemical, microbiological, and immunological components. The skin's microbiota affect various properties, one of which is the establishment and maintenance of the physical barrier. This is achieved by influencing multiple processes, including keratinocyte differentiation, stratum corneum formation, and regulation of intercellular contacts. In this review, we summarize the potential contribution of Cutibacterium acnes to these events and outline the contribution of bacterially induced barrier defects to the pathogenesis of acne vulgaris. With the combined effects of a Westernized lifestyle, microbial dysbiosis, epithelial barrier defects, and inflammation, the development of acne is very similar to that of several other multifactorial diseases of barrier organs (e.g., inflammatory bowel disease, celiac disease, asthma, atopic dermatitis, and chronic rhinosinusitis). Therefore, the management of acne requires a complex approach, which should be taken into account when designing novel treatments that address not only the inflammatory and microbial components but also the maintenance and strengthening of the cutaneous physical barrier.
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Affiliation(s)
- Kornélia Szabó
- HUN-REN-SZTE Dermatological Research Group, 6720 Szeged, Hungary
- Department of Dermatology and Allergology, Albert Szent-Györgyi Medical School, University of Szeged, 6720 Szeged, Hungary; (B.S.B.)
- HCEMM-USZ Skin Research Group, 6720 Szeged, Hungary
| | - Beáta Szilvia Bolla
- Department of Dermatology and Allergology, Albert Szent-Györgyi Medical School, University of Szeged, 6720 Szeged, Hungary; (B.S.B.)
- HCEMM-USZ Skin Research Group, 6720 Szeged, Hungary
| | - Lilla Erdei
- Department of Dermatology and Allergology, Albert Szent-Györgyi Medical School, University of Szeged, 6720 Szeged, Hungary; (B.S.B.)
- HCEMM-USZ Skin Research Group, 6720 Szeged, Hungary
| | - Fanni Balogh
- HUN-REN-SZTE Dermatological Research Group, 6720 Szeged, Hungary
- Department of Dermatology and Allergology, Albert Szent-Györgyi Medical School, University of Szeged, 6720 Szeged, Hungary; (B.S.B.)
| | - Lajos Kemény
- HUN-REN-SZTE Dermatological Research Group, 6720 Szeged, Hungary
- Department of Dermatology and Allergology, Albert Szent-Györgyi Medical School, University of Szeged, 6720 Szeged, Hungary; (B.S.B.)
- HCEMM-USZ Skin Research Group, 6720 Szeged, Hungary
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Park HY, Yu JH. X-ray radiation-induced intestinal barrier dysfunction in human epithelial Caco-2 cell monolayers. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 264:115404. [PMID: 37625335 DOI: 10.1016/j.ecoenv.2023.115404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 08/18/2023] [Accepted: 08/21/2023] [Indexed: 08/27/2023]
Abstract
Radiation therapy and unwanted radiological or nuclear exposure, such as nuclear plant accidents, terrorist attacks, and military conflicts, pose serious health issues to humans. Dysfunction of the intestinal epithelial barrier and the leakage of luminal antigens and bacteria across the barrier have been linked to various human diseases. Intestinal permeability is regulated by intercellular structures, termed tight junctions (TJs), which are disrupted after radiation exposure. In this study, we investigated radiation-induced alterations in TJ-related proteins in an intestinal epithelial cell model. Caco-2 cells were irradiated with 2, 5, and 10 Gy and harvested 1 and 24 h after X-ray exposure. The trypan blue assay revealed that cell viability was reduced in a dose-dependent manner 24 h after X-ray exposure compared to that of non-irradiated cells. However, the WST-8 assay revealed that cell proliferation was significantly reduced only 24 h after radiation exposure to 10 Gy compared to that of non-irradiated cells. In addition, a decreased growth rate and increased doubling time were observed in cells irradiated with X-rays. Intestinal permeability was significantly increased, and transepithelial electrical resistance values were remarkably reduced in Caco-2 cell monolayers irradiated with X-rays compared to non-irradiated cells. X-ray irradiation significantly decreased the mRNA and protein levels of ZO-1, occludin, claudin-3, and claudin-4, with ZO-1 and claudin-3 protein levels decreasing in a dose-dependent manner. Overall, the present study reveals that exposure to X-ray induces dysfunction of the human epithelial intestinal barrier and integrity via the downregulation of TJ-related genes, which may be a key factor contributing to intestinal barrier damage and increased intestinal permeability.
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Affiliation(s)
- Ha-Young Park
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea.
| | - Jin-Hee Yu
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea
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Erramilli SK, Dominik PK, Ogbu CP, Kossiakoff AA, Vecchio AJ. Cryo-EM structures of a synthetic antibody against 22 kDa claudin-4 reveal its complex with Clostridium perfringens enterotoxin. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.12.544689. [PMID: 37398044 PMCID: PMC10312657 DOI: 10.1101/2023.06.12.544689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Claudins are a family of ∼25 kDa membrane proteins that integrate into tight junctions to form molecular barriers at the paracellular spaces between endothelial and epithelial cells. Humans have 27 subtypes, which homo- and hetero-oligomerize to impart distinct properties and physiological functions to tissues and organs. As the structural and functional backbone of tight junctions, claudins are attractive targets for therapeutics capable of modulating tissue permeability to deliver drugs or treat disease. However, structures of claudins are limited due to their small sizes and physicochemical properties-these traits also make therapy development a challenge. We have developed a synthetic antibody fragment (sFab) that binds human claudin-4 and used it to resolve structures of its complex with Clostridium perfringens enterotoxin (CpE) using cryogenic electron microscopy (cryo-EM). The resolution of the structures reveals the architectures of 22 kDa claudin-4, the 14 kDa C-terminal domain of CpE, and the mechanism by which this sFab binds claudins. Further, we elucidate the biochemical and biophysical bases of sFab binding and demonstrate that this molecule exhibits subtype-selectivity by assaying homologous claudins. Our results provide a framework for developing sFabs against hard-to-target claudins and establishes the utility of sFabs as fiducial markers for determining cryo-EM structures of this small membrane protein family at resolutions that surpass X-ray crystallography. Taken together, this work highlights the ability of sFabs to elucidate claudin structure and function and posits their potential as therapeutics for modulating tight junctions by targeting specific claudin subtypes.
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Stoeckelhuber M, Grill FD, Wolff KD, Kesting MR, Wolff CT, Fichter AM, Loeffelbein DJ, Schmitz C, Ritschl LM. Infantile human labial glands: Distribution of aquaporins and claudins in the context of paracellular and transcellular pathways. Tissue Cell 2023; 82:102052. [PMID: 36905859 DOI: 10.1016/j.tice.2023.102052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 02/27/2023] [Accepted: 03/01/2023] [Indexed: 03/06/2023]
Abstract
Human labial glands consist of saliva-secreting cells which are formed by serous and predominantly mucous glandular cells. The following excretory duct system converts the isotonic saliva into a hypotonic fluid. Liquids are transported across the membrane of epithelial cells by paracellular or transcellular mode of action. We studied aquaporins (AQP) and tight junction proteins in the endpieces and duct system of human labial glands of 3-5-month-old infants for the first time. AQP1, AQP3, and AQP5 represent the transcellular transport; tight junction proteins like claudin-1, - 3, - 4, and - 7 regulate the permeability of the paracellular pathway. Specimens of 28 infants were included in this study and analyzed histologically. AQP1 was present in myoepithelial cells and in endothelial cells of small blood vessels. AQP3 showed basolateral plasmamembrane localization in glandular endpieces. AQP5 was localized at the apical cytomembrane in serous and mucous glandular cells and at the lateral membrane in serous cells. Ducts remained unstained with the antibody to AQP1, AQP3, and AQP5. Claudin-1, - 3, - 4, and - 7 were expressed mainly in the lateral plasmamembrane of serous glandular cells. In the ducts, claudin-1, - 4, and - 7 were detected at the basal cell layer, claudin-7 also at the lateral cytomembrane. Our findings provide new insights into the localization of epithelial barrier components necessary for regulating saliva-modification in infantile labial glands.
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Affiliation(s)
- Mechthild Stoeckelhuber
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany.
| | - Florian D Grill
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Klaus-Dietrich Wolff
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Marco R Kesting
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nuernberg, Erlangen, Germany
| | - Constantin T Wolff
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Andreas M Fichter
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Denys J Loeffelbein
- Department of Oral and Maxillofacial Surgery, Helios Hospital Munich West, Teaching Hospital of Ludwig-Maximilians-University of Munich, Munich, Germany
| | - Christoph Schmitz
- Department of Anatomy II, Faculty of Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - Lucas M Ritschl
- Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
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Kommineni N, Sainaga Jyothi VGS, Butreddy A, Raju S, Shapira T, Khan W, Angsantikul P, Domb AJ. SNAC for Enhanced Oral Bioavailability: An Updated Review. Pharm Res 2023; 40:633-650. [PMID: 36539668 DOI: 10.1007/s11095-022-03459-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022]
Abstract
The delivery of proteins and peptides via an oral route poses numerous challenges to improve the oral bioavailability and patient compliance. To overcome these challenges, as well as to improve the permeation of proteins and peptides via intestinal mucosa, several chemicals have been studied such as surfactants, fatty acids, bile salts, pH modifiers, and chelating agents, amongst these medium chain fatty acid like C10 (sodium caprate) and Sodium N-[8-(2-hydroxybenzoyl) amino] caprylate (SNAC) and its derivatives that have been well studied from a clinical perspective. This current review enumerates the challenges involved in protein and peptide delivery via the oral route, i.e., non-invasive routes of protein and peptide administration. This review also covers the chemistry behind SNAC and toxicity as well as mechanisms to enhance the oral delivery of clinically proven molecules like simaglutide and other small molecules under clinical development, as well as other permeation enhancers for efficient delivery of proteins and peptides.
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Affiliation(s)
- Nagavendra Kommineni
- Center for Biomedical Research, Population Council, New York, NY, 10065, USA.
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana, India.
| | - Vaskuri G S Sainaga Jyothi
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana, India
| | - Arun Butreddy
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, Oxford, MS, 38677, USA
| | - Saka Raju
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana, India
| | - Tovi Shapira
- School of Pharmacy and Faculty of Medicine, The Hebrew University of Jerusalem, Hadassah Medical Center, Ein Kerem Campus, 91120, Jerusalem, Israel
| | - Wahid Khan
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana, India
- Natco Research Centre, NATCO Pharma Limited, Hyderabad, 500018, India
| | - Pavimol Angsantikul
- Center for Biomedical Research, Population Council, New York, NY, 10065, USA
| | - Abraham J Domb
- School of Pharmacy and Faculty of Medicine, The Hebrew University of Jerusalem, Hadassah Medical Center, Ein Kerem Campus, 91120, Jerusalem, Israel.
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Wang DW, Zhang WH, Danil G, Yang K, Hu JK. The role and mechanism of claudins in cancer. Front Oncol 2022; 12:1051497. [PMID: 36620607 PMCID: PMC9818346 DOI: 10.3389/fonc.2022.1051497] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 11/28/2022] [Indexed: 12/24/2022] Open
Abstract
Claudins are a tetraspan membrane protein multigene family that plays a structural and functional role in constructing tight junctions. Claudins perform crucial roles in maintaining cell polarity in epithelial and endothelial cell sheets and controlling paracellular permeability. In the last two decades, increasing evidence indicates that claudin proteins play a major role in controlling paracellular permeability and signaling inside cells. Several types of claudins are dysregulated in various cancers. Depending on where the tumor originated, claudin overexpression or underexpression has been shown to regulate cell proliferation, cell growth, metabolism, metastasis and cell stemness. Epithelial-to-mesenchymal transition is one of the most important functions of claudin proteins in disease progression. However, the exact molecular mechanisms and signaling pathways that explain why claudin proteins are so important to tumorigenesis and progression have not been determined. In addition, claudins are currently being investigated as possible diagnostic and treatment targets. Here, we discuss how claudin-related signaling pathways affect tumorigenesis, tumor progression, and treatment sensitivity.
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Affiliation(s)
- De-Wen Wang
- Gastric Cancer Center and Laboratory of Gastric Cancer, Department of General Surgery, West China Hospital, Sichuan University, Chengdu, China,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Wei-Han Zhang
- Gastric Cancer Center and Laboratory of Gastric Cancer, Department of General Surgery, West China Hospital, Sichuan University, Chengdu, China,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Galiullin Danil
- Gastric Cancer Center and Laboratory of Gastric Cancer, Department of General Surgery, West China Hospital, Sichuan University, Chengdu, China,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China,Central Research Laboratory, Bashkir State Medical University, Ufa, Russia
| | - Kun Yang
- Gastric Cancer Center and Laboratory of Gastric Cancer, Department of General Surgery, West China Hospital, Sichuan University, Chengdu, China,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Jian-Kun Hu
- Gastric Cancer Center and Laboratory of Gastric Cancer, Department of General Surgery, West China Hospital, Sichuan University, Chengdu, China,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China,*Correspondence: Jian-Kun Hu,
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Abril AG, Villa TG, Sánchez-Pérez Á, Notario V, Carrera M. The Role of the Gallbladder, the Intestinal Barrier and the Gut Microbiota in the Development of Food Allergies and Other Disorders. Int J Mol Sci 2022; 23:ijms232214333. [PMID: 36430811 PMCID: PMC9696009 DOI: 10.3390/ijms232214333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 11/03/2022] [Accepted: 11/15/2022] [Indexed: 11/22/2022] Open
Abstract
The microbiota present in the gastrointestinal tract is involved in the development or prevention of food allergies and autoimmune disorders; these bacteria can enter the gallbladder and, depending on the species involved, can either be benign or cause significant diseases. Occlusion of the gallbladder, usually due to the presence of calculi blocking the bile duct, facilitates microbial infection and inflammation, which can be serious enough to require life-saving surgery. In addition, the biliary salts are secreted into the intestine and can affect the gut microbiota. The interaction between the gut microbiota, pathogenic organisms, and the human immune system can create intestinal dysbiosis, generating a variety of syndromes including the development of food allergies and autoimmune disorders. The intestinal microbiota can aggravate certain food allergies, which become severe when the integrity of the intestinal barrier is affected, allowing bacteria, or their metabolites, to cross the intestinal barrier and invade the bloodstream, affecting distal body organs. This article deals with health conditions and severe diseases that are either influenced by the gut flora or caused by gallbladder obstruction and inflammation, as well as putative treatments for those illnesses.
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Affiliation(s)
- Ana G. Abril
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, Sydney, NSW 2006, Australia
- Correspondence:
| | - Tomás G. Villa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - Ángeles Sánchez-Pérez
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, Sydney, NSW 2006, Australia
| | - Vicente Notario
- Department of Radiation Medicine, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Mónica Carrera
- Department of Food Technology, Spanish National Research Council, Marine Research Institute, 36208 Vigo, Spain
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11
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Xiao Y, Lian H, Zhong XS, Krishnachaitanya SS, Cong Y, Dashwood RH, Savidge TC, Powell DW, Liu X, Li Q. Matrix metalloproteinase 7 contributes to intestinal barrier dysfunction by degrading tight junction protein Claudin-7. Front Immunol 2022; 13:1020902. [PMID: 36275703 PMCID: PMC9581388 DOI: 10.3389/fimmu.2022.1020902] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 09/16/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundPrevious studies implicated matrix metalloproteinases (MMPs), such as MMP-7, in inflammatory bowel diseases (IBD) by showing increased activity during inflammation of the gut. However, the pathophysiological roles of MMP-7 have not been clearly elucidated.MethodsThe expression of MMP-7 was assessed in colonic biopsies of patients with ulcerative colitis (UC), in rodents with experimental colitis, and in cell-based assays with cytokines. Wild-type and MMP-7-null mice treated with dextran sulfate sodium (DSS) or trinitrobenzene sulfonic acid were used for determining the pro-inflammatory function(s) of MMP-7 in vivo.ResultsMMP-7 was highly expressed in patients with UC and in rodents with experimental colitis. IL-1β, IL-4, IL-13, TNFα, or lipopolysaccharide enhanced MMP-7 expression in human colonic epithelial cells, rat colonic smooth muscle cells, and THP-1-derived macrophages. Active MMP-7 degraded tight junction protein Claudin-7 in epithelial cells, cleaved recombinant Claudin-7 in cell-free system, and increased Caco-2 monolayer permeability. Immunostaining of colon biopsies revealed up-regulation of MMP-7 and reduction of Claudin-7 in UC patients. Compared to wild-type mice, Mmp7-/- mice had significantly less inflammation in the colon upon DSS insult. DSS-induced alterations in junction proteins were mitigated in Mmp7-/- mice, suggesting that MMP-7 disrupts the intestinal barrier. MMP-7 antibody significantly ameliorated colonic inflammation and Claudin-7 reduction in 2 different rodent models of colitis.SummaryMMP-7 impairs intestinal epithelial barrier by cleavage of Claudin-7, and thus aggravating inflammation. These studies uncovered Claudin-7 as a novel substrate of MMP-7 in the intestinal epithelium and reinforced MMP-7 as a potential therapeutic target for IBD.
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Affiliation(s)
- Ying Xiao
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, China
- Division of Gastroenterology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Haifeng Lian
- Yantai Affiliated Hospital of Binzhou Medical University, Yantai, China
| | - Xiaoying S. Zhong
- Division of Gastroenterology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Srikruthi S. Krishnachaitanya
- Division of Gastroenterology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Yingzi Cong
- Department of Microbiology and Immunology, University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Roderick H. Dashwood
- Center for Epigenetics & Disease Prevention, Texas A&M College of Medicine, Houston, TX, United States
| | - Tor C. Savidge
- Texas Children’s Microbiome Center, Baylor College of Medicine, Houston, TX, United States
| | - Don W. Powell
- Division of Gastroenterology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Xiaowei Liu
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, China
- *Correspondence: Xiaowei Liu, ; Qingjie Li,
| | - Qingjie Li
- Division of Gastroenterology, Department of Internal Medicine, University of Texas Medical Branch at Galveston, Galveston, TX, United States
- *Correspondence: Xiaowei Liu, ; Qingjie Li,
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12
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Quintanova C, Himmerkus N, Svendsen SL, von Schwerdtner O, Merkel C, Pinckert L, Mutig K, Breiderhoff T, Müller D, Günzel D, Bleich M. Unrecognized role of claudin-10b in basolateral membrane infoldings of the thick ascending limb. Ann N Y Acad Sci 2022; 1517:266-278. [PMID: 35996827 DOI: 10.1111/nyas.14882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Claudin-10b is an important component of the tight junction in the thick ascending limb (TAL) of Henle's loop and allows paracellular sodium transport. In immunofluorescence stainings, claudin-10b-positive cells exhibited extensive extra staining of basolateral, column-like structures. The precise localization and function have so far remained elusive. In isolated cortical TAL segments from C57BL/6J mice, kidney-specific claudin-10 knockout mice (cKO), and respective litter mates (WT), we investigated the localization and protein expression and function by fluorescence microscopy and electrophysiological measurements. Ultrastructural analysis of TAL in kidney sections was performed by electron microscopy. Claudin-10b colocalized with the basolateral Na+ -K+ ATPase and the Cl- channel subunit barttin, but the lack of claudin-10b did not influence the localization or abundance of these proteins. However, the accessibility of the basolateral infolded extracellular space to ouabain or fluorescein was increased by basolateral Ca2+ removal and in the absence of claudin-10b. Ultrastructural analysis by electron microscopy revealed a widening of basolateral membrane infoldings in cKO in comparison to WT. We hypothesize that claudin-10b shapes neighboring membrane invaginations by trans interaction to stabilize and facilitate high-flux salt transport in a water-tight epithelium.
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Affiliation(s)
| | - Nina Himmerkus
- Institute of Physiology, Christian-Albrechts-University, Kiel, Germany
| | - Samuel L Svendsen
- Department of Biomedicine, Physiology, Aarhus University, Aarhus, Denmark
| | | | - Cosima Merkel
- Institute of Physiology, Christian-Albrechts-University, Kiel, Germany
| | - Lennart Pinckert
- Institute of Physiology, Christian-Albrechts-University, Kiel, Germany
| | - Kerim Mutig
- Department of Anatomy, Charité-Universitätsmedizin, Berlin, Germany
| | - Tilman Breiderhoff
- Department of Pediatrics, Division of Gastroenterology, Nephrology, and Metabolic Medicine, Charité-Universitätsmedizin, Berlin, Germany
| | - Dominik Müller
- Department of Pediatrics, Division of Gastroenterology, Nephrology, and Metabolic Medicine, Charité-Universitätsmedizin, Berlin, Germany
| | - Dorothee Günzel
- Clinical Physiology/Nutritional Medicine, Charité-Universitätsmedizin, Berlin, Germany
| | - Markus Bleich
- Institute of Physiology, Christian-Albrechts-University, Kiel, Germany
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13
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Stein L, Brunner N, Amasheh S. Functional Analysis of Gastric Tight Junction Proteins in Xenopus laevis Oocytes. MEMBRANES 2022; 12:membranes12080731. [PMID: 35893449 PMCID: PMC9330571 DOI: 10.3390/membranes12080731] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/18/2022] [Accepted: 07/21/2022] [Indexed: 11/16/2022]
Abstract
The epithelial barrier is crucial for proper gastrointestinal function, preventing the unwanted passage of solutes and therefore representing a prerequisite for vectorial transport. Claudin-4 and claudin-18.2, two critical tight junction proteins of the gastric epithelium, seal neighboring cells in a physically and mechanically challenging environment. As the Xenopus laevis oocyte allows the functional and molecular analyses of claudin interaction, we have addressed the hypothesis that this interaction is not only dependent on mechanical force but also on pH. We expressed human claudin-4 and claudin-18 in Xenopus oocytes, and analyzed them in a two-cell model approach. Cells were clustered in pairs to form contact areas expressing CLDN18 + CLDN18, CLDN4/18 + CLDN4/18, and compared to controls, respectively. Contact areas in cells incubated in medium at pH 5.5 and 7.4 were quantified by employing transmitted light microscopy. After 24 h at pH 5.5, clustering of CLDN18 + CLDN18 and CLDN4/18 + CLDN4/18-expressing oocytes revealed a contact area reduced by 45% and 32%, compared with controls, respectively. A further approach, high-pressure impulse assay, revealed a stronger tight junction interaction at pH 5.5 in oocyte pairs expressing CLDN18 + CLDN18 or CLDN4/18 + CLDN4/18 indicating a protective role of claudin-18 for tight junction integrity during pH challenge. Thus, our current analysis of gastric tight junction proteins further establishes oocytes as an expression and two-cell screening model for tight junction integrity analysis of organ- and tissue-specific claudins by the characterization of homo- and heterophilic trans-interaction dependent on barrier effectors.
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Affiliation(s)
| | | | - Salah Amasheh
- Correspondence: ; Tel.: +49-30-838-62602; Fax: +49-30-838-462602
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14
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Mohammed Y, Holmes A, Kwok PCL, Kumeria T, Namjoshi S, Imran M, Matteucci L, Ali M, Tai W, Benson HA, Roberts MS. Advances and future perspectives in epithelial drug delivery. Adv Drug Deliv Rev 2022; 186:114293. [PMID: 35483435 DOI: 10.1016/j.addr.2022.114293] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 04/09/2022] [Indexed: 12/12/2022]
Abstract
Epithelial surfaces protect exposed tissues in the body against intrusion of foreign materials, including xenobiotics, pollen and microbiota. The relative permeability of the various epithelia reflects their extent of exposure to the external environment and is in the ranking: intestinal≈ nasal ≥ bronchial ≥ tracheal > vaginal ≥ rectal > blood-perilymph barrier (otic), corneal > buccal > skin. Each epithelium also varies in their morphology, biochemistry, physiology, immunology and external fluid in line with their function. Each epithelium is also used as drug delivery sites to treat local conditions and, in some cases, for systemic delivery. The associated delivery systems have had to evolve to enable the delivery of larger drugs and biologicals, such as peptides, proteins, antibodies and biologicals and now include a range of physical, chemical, electrical, light, sound and other enhancement technologies. In addition, the quality-by-design approach to product regulation and the growth of generic products have also fostered advancement in epithelial drug delivery systems.
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15
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Witika BA, Poka MS, Demana PH, Matafwali SK, Melamane S, Malungelo Khamanga SM, Makoni PA. Lipid-Based Nanocarriers for Neurological Disorders: A Review of the State-of-the-Art and Therapeutic Success to Date. Pharmaceutics 2022; 14:836. [PMID: 35456669 PMCID: PMC9031624 DOI: 10.3390/pharmaceutics14040836] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/28/2022] [Accepted: 04/04/2022] [Indexed: 02/01/2023] Open
Abstract
Neurodegenerative disorders including Alzheimer's, Parkinson's, and dementia are chronic and advanced diseases that are associated with loss of neurons and other related pathologies. Furthermore, these disorders involve structural and functional defections of the blood-brain barrier (BBB). Consequently, advances in medicines and therapeutics have led to a better appreciation of various pathways associated with the development of neurodegenerative disorders, thus focusing on drug discovery and research for targeted drug therapy to the central nervous system (CNS). Although the BBB functions as a shield to prevent toxins in the blood from reaching the brain, drug delivery to the CNS is hindered by its presence. Owing to this, various formulation approaches, including the use of lipid-based nanocarriers, have been proposed to address shortcomings related to BBB permeation in CNS-targeted therapy, thus showing the potential of these carriers for translation into clinical use. Nevertheless, to date, none of these nanocarriers has been granted market authorization following the successful completion of all stages of clinical trials. While the aforementioned benefits of using lipid-based carriers underscores the need to fast-track their translational development into clinical practice, technological advances need to be initiated to achieve appropriate capacity for scale-up and the production of affordable dosage forms.
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Affiliation(s)
- Bwalya Angel Witika
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, Pretoria 0208, South Africa; (M.S.P.); (P.H.D.)
| | - Madan Sai Poka
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, Pretoria 0208, South Africa; (M.S.P.); (P.H.D.)
| | - Patrick Hulisani Demana
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, Pretoria 0208, South Africa; (M.S.P.); (P.H.D.)
| | - Scott Kaba Matafwali
- Clinical Research Department, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London WC1E 7HT, UK;
| | - Siyabonga Melamane
- Stutterheim Hospital, No.1 Hospital Street, Stutterheim 4930, South Africa;
| | | | - Pedzisai Anotida Makoni
- Division of Pharmacology, Faculty of Pharmacy, Rhodes University, Makhanda 6140, South Africa
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16
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Disruption of Claudin-Made Tight Junction Barriers by Clostridium perfringens Enterotoxin: Insights from Structural Biology. Cells 2022; 11:cells11050903. [PMID: 35269525 PMCID: PMC8909277 DOI: 10.3390/cells11050903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 02/26/2022] [Accepted: 03/02/2022] [Indexed: 02/01/2023] Open
Abstract
Claudins are a family of integral membrane proteins that enable epithelial cell/cell interactions by localizing to and driving the formation of tight junctions. Via claudin self-assembly within the membranes of adjoining cells, their extracellular domains interact, forming barriers to the paracellular transport of small molecules and ions. The bacterium Clostridium perfringens causes prevalent gastrointestinal disorders in mammals by employing an enterotoxin (CpE) that targets claudins. CpE binds to claudins at or near tight junctions in the gut and disrupts their barrier function, potentially by disabling their assembly or via cell signaling means—the mechanism(s) remain unclear. CpE ultimately destroys claudin-expressing cells through the formation of a cytotoxic membrane-penetrating β-barrel pore. Structures obtained by X-ray crystallography of CpE, claudins, and claudins in complex with CpE fragments have provided the structural bases of claudin and CpE functions, revealing potential mechanisms for the CpE-mediated disruption of claudin-made tight junctions. This review highlights current progress in this space—what has been discovered and what remains unknown—toward efforts to elucidate the molecular mechanism of CpE disruption of tight junction barriers. It further underscores the key insights obtained through structure that are being applied to develop CpE-based therapeutics that combat claudin-overexpressing cancers or modulate tight junction barriers.
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17
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Zhuang X, Chen B, Huang S, Han J, Zhou G, Xu S, Chen M, Zeng Z, Zhang S. Hypermethylation of miR-145 promoter-mediated SOX9-CLDN8 pathway regulates intestinal mucosal barrier in Crohn's disease. EBioMedicine 2022; 76:103846. [PMID: 35124427 PMCID: PMC8829091 DOI: 10.1016/j.ebiom.2022.103846] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/12/2022] [Accepted: 01/13/2022] [Indexed: 12/20/2022] Open
Abstract
Background Intestinal barrier impairment plays an essential role in the pathogenesis of Crohn's disease (CD), and claudins (CLDNs) dysfunction contributes to intestinal mucosa injury. SOX9, an important transcription factor, is upregulated in the disease-affected colon of patients with CD; however, its precise role in CD remains largely unknown. Our aim was to explore the interaction between SOX9 and CLDNs, and further elucidate the underlying mechanisms in CD. Methods SOX9 expression in patients with CD was evaluated using quantitative polymerase chain reaction, immunoblotting, and immunohistochemistry. The regulatory relationship between SOX9 and CLDNs was analyzed via a dual-luciferase reporter assay, chromatin immunoprecipitation, overexpression, and RNA interference methods. MicroRNAs (miRNAs) involved in the SOX9-CLDN pathway were predicted with bioinformatics analysis, and the upstream molecular mechanism was interpreted using MassARRAY methylation detection. Findings Upregulated expression of SOX9 in the disease-affected intestine mucosa was identified in both patients with CD and mice challenged with trinitrobenzene sulfonic acid (TNBS). SOX9 negatively regulated the expression of CLDN8, accompanying reduced intestinal permeability. MiR-145-5p downregulation was found in patients with CD and TNBS-induced colitis mice owing to an aberrant miR-145 promoter hypermethylation, which subsequently interfered the SOX9-CLDN8 pathway. MiR-145-5p agomir treatment alleviated TNBS-induced colitis in wild-type mice by inhibiting Sox9 expression and restoring Cldn8 expression, whereas similar findings were not apparent in the Cldn8−/− mice. Interpretation SOX9 mediates the crosstalk between upstream miR-145-5p and downstream CLDN8, and further impairs intestinal mucosal barrier homeostasis in CD. Targeting the miR-145-5p/SOX9/CLDN8 pathway represents a promising therapeutic strategy for CD. Funding The National Natural Science Foundation of China (#81870374, #81670498, #81630018, #82070538, #8210031148), the Guangdong Science and Technology (#2017A030306021, #2020A1515111087), the Guangzhou Science and Technology Department (#202002030041), and the Fundamental Research Funds for the Central Universities (#19ykzd11).
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Affiliation(s)
- Xiaojun Zhuang
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Baili Chen
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Shanshan Huang
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Jing Han
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Gaoshi Zhou
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Shu Xu
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Minhu Chen
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Zhirong Zeng
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Shenghong Zhang
- Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
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18
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Ellagic Acid Alleviates Oxidative Stress by Mediating Nrf2 Signaling Pathways and Protects against Paraquat-Induced Intestinal Injury in Piglets. Antioxidants (Basel) 2022; 11:antiox11020252. [PMID: 35204135 PMCID: PMC8868335 DOI: 10.3390/antiox11020252] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 12/26/2022] Open
Abstract
The gastrointestinal tract is a key source of superoxide so as to be one of the most vulnerable to oxidative stress damage. Ellagic acid (EA), a polyphenol displays widely biological activities owing to its strong antioxidant properties. Here, we investigated the protective benefits of EA on oxidative stress and intestinal barrier injury in paraquet (PQ)-challenged piglets. A total of 40 weaned piglets were randomly divided into five groups: Control, PQ, 0.005% EA-PQ, 0.01% EA-PQ, and 0.02% EA-PQ. Piglets were intraperitoneally injected with 4 mg/kg (BW) PQ or saline on d-18, and sacrificed on d-21 of experiment. EA treatments eliminated growth-check induced by PQ and increased serum superoxide dismutase (SOD) activity but decreased serum malondialdehyde (MDA) level as compared to PQ group. EA supplementation promoted Nrf2 nuclear translocation and enhanced heme oxygenase-1 (HO-1) and quinone oxidoreductase 1 (NQO1) protein abundances of small intestinal mucosa. Additionally, EA improved PQ-induced crypt deepening, goblet cells loss, and villi morphological damage. Consistently, EA increased tight junction protein expression as was evident from the decreased serum diamine oxidase (DAO) levels. EA could ameliorate the PQ-induced oxidative stress and intestinal damage through mediating Nrf2 signaling pathway. Intake of EA-rich food might prevent oxidative stress-mediated gut diseases.
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19
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Barany A, Oliva M, Gregório SF, Martínez-Rodríguez G, Mancera JM, Fuentes J. Dysregulation of Intestinal Physiology by Aflatoxicosis in the Gilthead Seabream ( Sparus aurata). Front Physiol 2022; 12:741192. [PMID: 34987413 PMCID: PMC8722709 DOI: 10.3389/fphys.2021.741192] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 11/22/2021] [Indexed: 12/11/2022] Open
Abstract
Aflatoxin B1 (AFB1) is a mycotoxin often present in food. This study aimed to understand the physiological effects of AFB1 on the seabream (Sparus aurata) gastrointestinal system. In a first in vitro approach, we investigated ion transport using the short-circuit current (Isc) technique in Ussing chambers in the anterior intestine (AI). Application of apical/luminal AFB1 concentrations of 8 and 16 μM to healthy tissues was without effect on tissue transepithelial electrical resistance (TER), and apparent tissue permeability (Papp) was measured using fluorescein FITC (4 kD). However, it resulted in dose-related effects on Isc. In a second approach, seabream juveniles fed with different AFB1 concentrations (1 and 2 mg AFB1 kg−1 fish feed) for 85 days showed significantly reduced gill Na+/K+-ATPase (NKA) and H+-ATPase (HA) activities in the posterior intestine (PI). Moreover, dietary AFB1 modified Isc in the AI and PI, significantly affecting TER in the AI. To understand this effect on TER, we analyzed the expression of nine claudins and three occludins as markers of intestinal architecture and permeability using qPCR. Around 80% of the genes presented significantly different relative mRNA expression between AI and PI and had concomitant sensitivity to dietary AFB1. Based on the results of our in vitro, in vivo, and molecular approaches, we conclude that the effects of dietary AFB1 in the gastrointestinal system are at the base of the previously reported growth impairment caused by AFB1 in fish.
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Affiliation(s)
- Andre Barany
- Department of Biology, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEI·MAR), University of Cádiz, Cádiz, Spain
| | - Milagrosa Oliva
- Department of Biology, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEI·MAR), University of Cádiz, Cádiz, Spain
| | - Silvia Filipa Gregório
- Centre of Marine Sciences (CCMar), Universidade do Algarve, Campus de Gambelas, Faro, Portugal
| | - Gonzalo Martínez-Rodríguez
- Instituto de Ciencias Marinas de Andalucía, Consejo Superior de Investigaciones Científicas (ICMAN-CSIC), Cádiz, Spain
| | - Juan Miguel Mancera
- Department of Biology, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEI·MAR), University of Cádiz, Cádiz, Spain
| | - Juan Fuentes
- Centre of Marine Sciences (CCMar), Universidade do Algarve, Campus de Gambelas, Faro, Portugal
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20
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Zhao Y, Huang J, Li T, Zhang S, Wen C, Wang L. Berberine ameliorates aGVHD by gut microbiota remodelling, TLR4 signalling suppression and colonic barrier repairment for NLRP3 inflammasome inhibition. J Cell Mol Med 2022; 26:1060-1070. [PMID: 34984827 PMCID: PMC8831946 DOI: 10.1111/jcmm.17158] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/22/2021] [Accepted: 12/17/2021] [Indexed: 02/05/2023] Open
Abstract
Berberine (BBR), an isoquinoline alkaloid, is used to treat gastrointestinal disorders as an herbal medicine in China. The aim of this study was to investigate the anti‐inflammatory activities of BBR in a mouse model with acute graft‐versus‐host disease (aGVHD). Mice were intravenously injected with bone marrow cells from donors combined with splenocytes to develop aGVHD. The body weight, survival rate and clinical scores were monitored. Then the levels of inflammatory cytokines, histological changes (lung, liver and colon), colonic mucosal barrier and gut microbiota were analysed. Moreover, the toll‐like receptor 4 (TLR4)/myeloid differentiation primary response gene 88 (Myd88)/nuclear factor‐κB signalling pathway, NLRP3 inflammasome and its cytokines’ expressions were determined. The results showed that the gavage of BBR lessened GVHD‐induced weight loss, high mortality and clinical scores, inhibited inflammation and target organs damages and prevented GVHD‐indued colonic barrier damage. Additionally, BBR modulated gut microbiota, suppressed the activation of the TLR4 signaling pathway and inhibited NLRP3 inflammasome and its cytokine release. This study indicated that BBR might be a potential therapy for aGVHD through NLRP3 inflammasome inhibition.
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Affiliation(s)
- Yanna Zhao
- College of Basic Medical Science, Zhejiang Chinese Medical University, Hangzhou, China.,Institute of Hematology Research, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Jiefeng Huang
- Institute of Hematology Research, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Tianyi Li
- College of Basic Medical Science, Zhejiang Chinese Medical University, Hangzhou, China
| | - Shuijuan Zhang
- College of Basic Medical Science, Zhejiang Chinese Medical University, Hangzhou, China
| | - Chengping Wen
- College of Basic Medical Science, Zhejiang Chinese Medical University, Hangzhou, China
| | - Lipei Wang
- College of Basic Medical Science, Zhejiang Chinese Medical University, Hangzhou, China
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21
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Tight junction protein CLDN17 serves as a tumor suppressor to reduce the invasion and migration of oral cancer cells by inhibiting epithelial-mesenchymal transition. Arch Oral Biol 2021; 133:105301. [PMID: 34781072 DOI: 10.1016/j.archoralbio.2021.105301] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/25/2021] [Accepted: 10/27/2021] [Indexed: 12/11/2022]
Abstract
OBJECTIVE To investigate claudin-17 (CLDN17) expression in oral cancer and its effect on epithelial-mesenchymal transition (EMT), invasion and migration in oral cancer cells. METHODS The GEO2R tool was used to analyze gene expression in two microarray datasets (GSE74530 and GSE146483) derived from the Gene Expression Omnibus (GEO) database. Gene Expression Profiling Interactive Analysis (GEPIA) verified CLDN17 expression in head and neck squamous cell carcinoma (HNSC) patients. Moreover, oral cancer cells were transfected with CLDN17 overexpression plasmid or CLDN17 shRNA to evaluate cell invasion and migration. Gene and protein expression was detected by qRT-PCR, immunohistochemistry and western blotting. RESULTS CLDN17 was one of the top 200 differentially expressed genes in the GSE74530 and GSE146483 datasets and was downregulated in oral cancer. CLDN17 expression was higher in HNSC tissues, and it was related to TNM staging. In HNSC tumors, CLDN17 expression was positively correlated with CDH1 but negatively related to VIM, SNAIL1, SNAIL2, and TWIST1. Meanwhile, we found that CLDN17 expression was lower in oral cancer tissues; it declined with higher T status, N status, M status and staging, lower differentiation grade, and a worse prognosis. Upregulation of CLDN17 inhibited the invasion and migration of oral cancer cells, with elevated CDH1 and reduced VIM, SNAIL1, SNAIL2, and TWIST1, while CLDN17 downregulation had the opposite effects. CONCLUSION CLDN17 may serve as a tumor suppressor in oral cancer since it could reduce the invasion and migration of cells by inhibiting the EMT process, thus becoming a potential therapeutic target in oral cancer.
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22
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Mechanisms of the Cytotoxic Effect of Selenium Nanoparticles in Different Human Cancer Cell Lines. Int J Mol Sci 2021; 22:ijms22157798. [PMID: 34360564 PMCID: PMC8346078 DOI: 10.3390/ijms22157798] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/17/2021] [Accepted: 07/20/2021] [Indexed: 02/06/2023] Open
Abstract
In recent decades, studies on the functional features of Se nanoparticles (SeNP) have gained great popularity due to their high biocompatibility, stability, and pronounced selectivity. A large number of works prove the anticarcinogenic effect of SeNP. In this work, the molecular mechanisms regulating the cytotoxic effects of SeNP, obtained by laser ablation, were studied by the example of four human cancer cell lines: A-172 (glioblastoma), Caco-2, (colorectal adenocarcinoma), DU-145 (prostate carcinoma), MCF-7 (breast adenocarcinoma). It was found that SeNP had different concentration-dependent effects on cancer cells of the four studied human lines. SeNP at concentrations of less than 1 μg/mL had no cytotoxic effect on the studied cancer cells, with the exception of the A-172 cell line, for which 0.5 μg/mL SeNP was the minimum concentration affecting its metabolic activity. It was shown that SeNP concentration-dependently caused cancer cell apoptosis, but not necrosis. In addition, it was found that SeNP enhanced the expression of pro-apoptotic genes in almost all cancer cell lines, with the exception of Caco-2 and activated various pathways of adaptive and pro-apoptotic signaling pathways of UPR. Different effects of SeNP on the expression of ER-resident selenoproteins and selenium-containing glutathione peroxidases and thioredoxin reductases, depending on the cell line, were established. In addition, SeNP triggered Ca2+ signals in all investigated cancer cell lines. Different sensitivity of cancer cell lines to SeNP can determine the induction of the process of apoptosis in them through regulation of the Ca2+ signaling system, mechanisms of ER stress, and activation of various expression patterns of genes encoding pro-apoptotic proteins.
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23
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Wicha P, Das S, Mahakkanukrauh P. Blood-brain barrier dysfunction in ischemic stroke and diabetes: the underlying link, mechanisms and future possible therapeutic targets. Anat Cell Biol 2021; 54:165-177. [PMID: 33658432 PMCID: PMC8225477 DOI: 10.5115/acb.20.290] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/27/2020] [Accepted: 01/30/2021] [Indexed: 01/04/2023] Open
Abstract
Ischemic stroke caused by occlusion of cerebral artery is responsible for the majority of stroke that increases the morbidity and mortality worldwide. Diabetes mellitus (DM) is a crucial risk factor for ischemic stroke. Prolonged DM causes various microvascular and macrovascular changes, and blood-brain barrier (BBB) permeability that facilitates inflammatory response following stroke. In the acute phase following stroke, BBB disruption has been considered the initial step that induces neurological deficit and functional disabilities. Stroke outcomes are significantly worse among DM. In this article, we review stroke with diabetes-induce BBB damage, as well as underlying mechanism and possible therapeutic targets for stroke with diabetes.
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Affiliation(s)
- Piyawadee Wicha
- Department of Anatomy, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Srijit Das
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
| | - Pasuk Mahakkanukrauh
- Department of Anatomy, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.,Excellence in Osteology Research and Training Center (ORTC), Chiang Mai University, Chiang Mai, Thailand
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Guo Y, Dong L, Gong A, Zhang J, Jing L, Ding T, Li PAA, Zhang JZ. Damage to the blood‑brain barrier and activation of neuroinflammation by focal cerebral ischemia under hyperglycemic condition. Int J Mol Med 2021; 48:142. [PMID: 34080644 PMCID: PMC8175066 DOI: 10.3892/ijmm.2021.4975] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 04/28/2021] [Indexed: 12/15/2022] Open
Abstract
Hyperglycemia aggravates brain damage caused by cerebral ischemia/reperfusion (I/R) and increases the permeability of the blood‑brain barrier (BBB). However, there are relatively few studies on morphological changes of the BBB. The present study aimed to investigate the effect of hyperglycemia on BBB morphological changes following cerebral I/R injury. Streptozotocin‑induced hyperglycemic and citrate‑buffered saline‑injected normoglycemic rats were subjected to 30 min middle cerebral artery occlusion. Neurological deficits were evaluated. Brain infarct volume was assessed by 2,3,5‑triphenyltetrazolium chloride staining and BBB integrity was evaluated by Evans blue and IgG extravasation following 24 h reperfusion. Changes in tight junctions (TJ) and basement membrane (BM) proteins (claudin, occludin and zonula occludens‑1) were examined using immunohistochemistry and western blotting. Astrocytes, microglial cells and neutrophils were labeled with specific antibodies for immunohistochemistry after 1, 3 and 7 days of reperfusion. Hyperglycemia increased extravasations of Evan's blue and IgG and aggravated damage to TJ and BM proteins following I/R injury. Furthermore, hyperglycemia suppressed astrocyte activation and damaged astrocytic endfeet surrounding cerebral blood vessels following I/R. Hyperglycemia inhibited microglia activation and proliferation and increased neutrophil infiltration in the brain. It was concluded that hyperglycemia‑induced BBB leakage following I/R might be caused by damage to TJ and BM proteins and astrocytic endfeet. Furthermore, suppression of microglial cells and increased neutrophil infiltration to the brain may contribute to the detrimental effects of pre‑ischemic hyperglycemia on the outcome of cerebral ischemic stroke.
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Affiliation(s)
- Yongzhen Guo
- Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
| | - Lingdi Dong
- Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
| | - Ao Gong
- Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
| | - Jingwen Zhang
- Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
| | - Li Jing
- Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
| | - Tomas Ding
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technological Enterprise, College of Health and Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - Ping-An Andy Li
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technological Enterprise, College of Health and Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - Jian-Zhong Zhang
- Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
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Structural basis for Clostridium perfringens enterotoxin targeting of claudins at tight junctions in mammalian gut. Proc Natl Acad Sci U S A 2021; 118:2024651118. [PMID: 33876770 PMCID: PMC8053971 DOI: 10.1073/pnas.2024651118] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The bacterium Clostridium perfringens causes severe, sometimes lethal gastrointestinal disorders in humans, including enteritis and enterotoxemia. Type F strains produce an enterotoxin (CpE) that causes the third most common foodborne illness in the United States. CpE induces gut breakdown by disrupting barriers at cell-cell contacts called tight junctions (TJs), which are formed and maintained by claudins. Targeted binding of CpE to specific claudins, encoded by its C-terminal domain (cCpE), loosens TJ barriers to trigger molecular leaks between cells. Cytotoxicity results from claudin-bound CpE complexes forming pores in cell membranes. In mammalian tissues, ∼24 claudins govern TJ barriers-but the basis for CpE's selective targeting of claudins in the gut was undetermined. We report the structure of human claudin-4 in complex with cCpE, which reveals that enterotoxin targets a motif conserved in receptive claudins and how the motif imparts high-affinity CpE binding to these but not other subtypes. The structural basis of CpE targeting is supported by binding affinities, kinetics, and half-lives of claudin-enterotoxin complexes and by the cytotoxic effects of CpE on claudin-expressing cells. By correlating the binding residence times of claudin-CpE complexes we determined to claudin expression patterns in the gut, we uncover that the primary CpE receptors differ in mice and humans due to sequence changes in the target motif. These findings provide the molecular and structural element CpE employs for subtype-specific targeting of claudins during pathogenicity of C. perfringens in the gut and a framework for new strategies to treat CpE-based illnesses in domesticated mammals and humans.
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26
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Xiang P, Chew WS, Seow WL, Lam BWS, Ong WY, Herr DR. The S1P 2 receptor regulates blood-brain barrier integrity and leukocyte extravasation with implications for neurodegenerative disease. Neurochem Int 2021; 146:105018. [PMID: 33727061 DOI: 10.1016/j.neuint.2021.105018] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 03/04/2021] [Accepted: 03/07/2021] [Indexed: 01/08/2023]
Abstract
Sphingosine 1-phosphate (S1P) is a bioactive sphingolipid which modulates vascular integrity through its receptors, S1P1-S1P5. Notably, S1P2 has been shown to mediate the disruption of cerebrovascular integrity in vitro and in vivo. However, the mechanism underlying this process has not been fully elucidated. We evaluated the role of S1P2 in blood-brain barrier (BBB) disruption induced by lipopolysaccharide (LPS)-mediated systemic inflammation and found that BBB disruption and neutrophil infiltration were significantly attenuated in S1pr2-/- mice relative to S1pr2+/- littermates. This is concomitant with attenuation of LPS-induced transcriptional activation of IL-6 and downregulation of occludin. Furthermore, S1pr2-/- mice had significantly reduced expression of genes essential for neutrophil infiltration: Sele, Cxcl1, and Cxcl2. Conversely, pharmacological agonism of S1P2 induced transcriptional activation of E-selectin in vitro and in vivo. Although S1P2 does not appear to be required for activation of microglia, stimulation of microglial cells with the S1P2 potentiated the response of endothelial cells to LPS. These results demonstrate that S1P2 promotes LPS-induced neutrophil extravasation by inducing expression of endothelial adhesion molecule gene, Sele, and potentiating microglial inflammation of endothelial cells. It is likely that S1P2 is a mediator of cerebrovascular inflammation and represents a potential therapeutic target for neurodegenerative disease such as vascular cognitive impairment.
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Affiliation(s)
- Ping Xiang
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Wee Siong Chew
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Wei Lun Seow
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
| | - Brenda Wan Shing Lam
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Wei-Yi Ong
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Deron R Herr
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Biology, San Diego State University, San Diego, CA, 92182, USA; American University of Health Sciences, Long Beach, CA, 90755, USA.
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27
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Li F, Egea PF, Vecchio AJ, Asial I, Gupta M, Paulino J, Bajaj R, Dickinson MS, Ferguson-Miller S, Monk BC, Stroud RM. Highlighting membrane protein structure and function: A celebration of the Protein Data Bank. J Biol Chem 2021; 296:100557. [PMID: 33744283 PMCID: PMC8102919 DOI: 10.1016/j.jbc.2021.100557] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 02/10/2021] [Accepted: 03/16/2021] [Indexed: 12/13/2022] Open
Abstract
Biological membranes define the boundaries of cells and compartmentalize the chemical and physical processes required for life. Many biological processes are carried out by proteins embedded in or associated with such membranes. Determination of membrane protein (MP) structures at atomic or near-atomic resolution plays a vital role in elucidating their structural and functional impact in biology. This endeavor has determined 1198 unique MP structures as of early 2021. The value of these structures is expanded greatly by deposition of their three-dimensional (3D) coordinates into the Protein Data Bank (PDB) after the first atomic MP structure was elucidated in 1985. Since then, free access to MP structures facilitates broader and deeper understanding of MPs, which provides crucial new insights into their biological functions. Here we highlight the structural and functional biology of representative MPs and landmarks in the evolution of new technologies, with insights into key developments influenced by the PDB in magnifying their impact.
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Affiliation(s)
- Fei Li
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, USA; Department of Neurology, University of California San Francisco, San Francisco, California, USA
| | - Pascal F Egea
- Department of Biological Chemistry, School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Alex J Vecchio
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | | | - Meghna Gupta
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, USA
| | - Joana Paulino
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, USA
| | - Ruchika Bajaj
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, USA
| | - Miles Sasha Dickinson
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, USA
| | - Shelagh Ferguson-Miller
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Brian C Monk
- Sir John Walsh Research Institute and Department of Oral Sciences, University of Otago, North Dunedin, Dunedin, New Zealand
| | - Robert M Stroud
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, USA.
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28
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Adil MS, Narayanan SP, Somanath PR. Cell-cell junctions: structure and regulation in physiology and pathology. Tissue Barriers 2020; 9:1848212. [PMID: 33300427 DOI: 10.1080/21688370.2020.1848212] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Epithelial and endothelial cell-cell contacts are established and maintained by several intercellular junctional complexes. These structurally and biochemically differentiated regions on the plasma membrane primarily include tight junctions (TJs), and anchoring junctions. While the adherens junctions (AJs) provide essential adhesive and mechanical properties, TJs hold the cells together and form a near leak-proof intercellular seal by the fusion of adjacent cell membranes. AJs and TJs play essential roles in vascular permeability. Considering their involvement in several key cellular functions such as barrier formation, proliferation, migration, survival, and differentiation, further research is warranted on the composition and signaling pathways regulating cell-cell junctions to develop novel therapeutics for diseases such as organ injuries. The current review article presents our current state of knowledge on various cell-cell junctions, their molecular composition, and mechanisms regulating their expression and function in endothelial and epithelial cells.
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Affiliation(s)
- Mir S Adil
- Clinical and Experimental Therapeutics, University of Georgia and Charlie Norwood VA Medical Center , Augusta, GA, USA
| | - S Priya Narayanan
- Clinical and Experimental Therapeutics, University of Georgia and Charlie Norwood VA Medical Center , Augusta, GA, USA
| | - Payaningal R Somanath
- Clinical and Experimental Therapeutics, University of Georgia and Charlie Norwood VA Medical Center , Augusta, GA, USA
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29
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Riesenberg C, Iriarte-Valdez CA, Becker A, Dienerowitz M, Heisterkamp A, Ngezahayo A, Torres-Mapa ML. Probing Ligand-Receptor Interaction in Living Cells Using Force Measurements With Optical Tweezers. Front Bioeng Biotechnol 2020; 8:598459. [PMID: 33282853 PMCID: PMC7705203 DOI: 10.3389/fbioe.2020.598459] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/01/2020] [Indexed: 01/08/2023] Open
Abstract
This work probes the binding kinetics of COOH-terminus of Clostridium perfringens enterotoxin (c-CPE) and claudin expressing MCF-7 cells using force spectroscopy with optical tweezers. c-CPE is of high biomedical interest due to its ability to specifically bind to claudin with high affinity as well as reversibly disrupt tight junctions whilst maintaining cell viability. We observed single-step rupture events between silica particles functionalized with c-CPE and MCF-7 cells. Extensive calibration of the optical tweezers' trap stiffness and displacement of the particle from trap center extracted a probable bond rupture force of ≈ 18 pN. The probability of rupture events with c-CPE functionalized silica particles increased by 50% compared to unfunctionalized particles. Additionally, rupture events were not observed when probing cells not expressing claudin with c-CPE coated particles. Overall, this work demonstrates that optical tweezers are invaluable tools to probe ligand-receptor interactions and their potential to study dynamic molecular events in drug-binding scenarios.
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Affiliation(s)
- Carolin Riesenberg
- Institute of Quantum Optics, Leibniz University Hannover, Hannover, Germany.,Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Germany
| | - Christian Alejandro Iriarte-Valdez
- Institute of Quantum Optics, Leibniz University Hannover, Hannover, Germany.,Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Germany
| | - Annegret Becker
- Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover, Germany
| | - Maria Dienerowitz
- Single-Molecule Microscopy Group, Jena University Hospital, Jena, Germany
| | - Alexander Heisterkamp
- Institute of Quantum Optics, Leibniz University Hannover, Hannover, Germany.,Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Germany
| | - Anaclet Ngezahayo
- Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover, Germany
| | - Maria Leilani Torres-Mapa
- Institute of Quantum Optics, Leibniz University Hannover, Hannover, Germany.,Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Germany
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30
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Saba LM, Hoffman PL, Homanics GE, Mahaffey S, Daulatabad SV, Janga SC, Tabakoff B. A long non-coding RNA (Lrap) modulates brain gene expression and levels of alcohol consumption in rats. GENES BRAIN AND BEHAVIOR 2020; 20:e12698. [PMID: 32893479 PMCID: PMC7900948 DOI: 10.1111/gbb.12698] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/20/2020] [Accepted: 09/01/2020] [Indexed: 12/14/2022]
Abstract
LncRNAs are important regulators of quantitative and qualitative features of the transcriptome. We have used QTL and other statistical analyses to identify a gene coexpression module associated with alcohol consumption. The "hub gene" of this module, Lrap (Long non-coding RNA for alcohol preference), was an unannotated transcript resembling a lncRNA. We used partial correlation analyses to establish that Lrap is a major contributor to the integrity of the coexpression module. Using CRISPR/Cas9 technology, we disrupted an exon of Lrap in Wistar rats. Measures of alcohol consumption in wild type, heterozygous and knockout rats showed that disruption of Lrap produced increases in alcohol consumption/alcohol preference. The disruption of Lrap also produced changes in expression of over 700 other transcripts. Furthermore, it became apparent that Lrap may have a function in alternative splicing of the affected transcripts. The GO category of "Response to Ethanol" emerged as one of the top candidates in an enrichment analysis of the differentially expressed transcripts. We validate the role of Lrap as a mediator of alcohol consumption by rats, and also implicate Lrap as a modifier of the expression and splicing of a large number of brain transcripts. A defined subset of these transcripts significantly impacts alcohol consumption by rats (and possibly humans). Our work shows the pleiotropic nature of non-coding elements of the genome, the power of network analysis in identifying the critical elements influencing phenotypes, and the fact that not all changes produced by genetic editing are critical for the concomitant changes in phenotype.
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Affiliation(s)
- Laura M Saba
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Paula L Hoffman
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA.,Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Gregg E Homanics
- Departments of Anesthesiology, Neurobiology and Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Spencer Mahaffey
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Swapna Vidhur Daulatabad
- Department of BioHealth Informatics, Indiana University School of Informatics and Computing, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana, USA
| | - Sarath Chandra Janga
- Department of BioHealth Informatics, Indiana University School of Informatics and Computing, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana, USA.,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Boris Tabakoff
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
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31
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Fagotto F, Aslemarz A. EpCAM cellular functions in adhesion and migration, and potential impact on invasion: A critical review. Biochim Biophys Acta Rev Cancer 2020; 1874:188436. [PMID: 32976980 DOI: 10.1016/j.bbcan.2020.188436] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/19/2020] [Accepted: 09/19/2020] [Indexed: 12/14/2022]
Abstract
EpCAM has long been known as a cell surface protein highly expressed in carcinomas. It has since become one of the key cancer biomarkers. Despite its high fame, its actual role in cancer development is still controversial. Beyond a flurry of correlative studies, which point either to a positive or a negative link with tumour progression, there has been surprisingly few studies on the actual cellular mechanisms of EpCAM and on their functional consequences. Clearly, EpCAM plays multiple important roles, in cell proliferation as well as in cell adhesion and migration. The two latter functions, directly relevant for metastasis, are the focus of this review. We attempt here to bring together the available experimental data to build a global coherent view of EpCAM functions. We also include in this overview EpCAM2/Trop2, the close relative of EpCAM. At the core of EpCAM (and EpCAM2/Trop2) function stands the ability to repress contractility of the actomyosin cell cortex. This activity appears to involve direct inhibition by EpCAM of members of the novel PKC family and of a specific downstream PKD-Erk cascade. We will discuss how this activity can result in a variety of adhesive and migratory phenotypes, thus potentially explaining at least part of the apparent inconsistencies between different studies. The picture remains fragmented, and we will highlight some of the conflicting evidence and the many unsolved issues, starting with the controversy around its original description as a cell-cell adhesion molecule.
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Affiliation(s)
- François Fagotto
- CRBM, University of Montpellier and CNRS, Montpellier 34293, France.
| | - Azam Aslemarz
- CRBM, University of Montpellier and CNRS, Montpellier 34293, France; Department of Biology, McGill University, Montreal, QC H3A1B1, Canada
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32
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Lee PH, Hong J, Jang AS. N-acetylcysteine decreases airway inflammation and responsiveness in asthma by modulating claudin 18 expression. Korean J Intern Med 2020; 35:1229-1237. [PMID: 32098455 PMCID: PMC7487305 DOI: 10.3904/kjim.2019.105] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 07/15/2019] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND/AIMS N-acetylcysteine (NAC) affects signaling pathways involved in apoptosis, angiogenesis, cell growth and arrest, redox-regulated gene expression, and the inflammatory response. However, it is not known how the signal mechanism for tight junctional protein claudin (CLDN) 18 is regulated in asthma patients. METHODS To investigate the effects of NAC on CLDN18 expression in a mouse model of asthma, and to assess plasma levels of CLDN18 in asthma patients. A murine model of asthma induced by ovalbumin (OVA) was established using wild-type BALB/c female mice, and the levels of CLDNs, phosphorylated-pyruvate dehydrogenase kinase 1 (p-PDK1), and protein kinase B (Akt) pathway proteins following NAC treatment were examined by Western blotting and immunohistochemistry. In addition, the plasma levels of CLDN18 were evaluated in asthmatic patients and control subjects. RESULTS NAC diminished OVA-induced airway hyper-responsiveness and inflammation. Levels of CLDN18 protein were higher in lung tissue from OVA mice than tissue from control mice, and were increased by treatment with NAC or dexamethasone. Treatment with NAC or dexamethasone decreased the OVA-induced increase in interleukin-1α protein levels. Although treatment with NAC increased OVA-induced p-PDK1 protein levels, it decreased phosphorylated Akt (pAkt)/Akt levels. Soluble CLDN18 levels were lower in patients with asthma than in controls and were correlated with the percentage of neutrophils, forced expiratory volume in 1 second (FEV1)/forced vital capacity % (FVC%) and FEV1%. CONCLUSION CLDN18 plays a role in the pathogenesis of asthma and NAC diminishes airway inflammation and responsiveness by modulating CLDN18 expression.
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Affiliation(s)
- Pureun-Haneul Lee
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Jisu Hong
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - An-Soo Jang
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
- Correspondence to An-Soo Jang, M.D. Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, 170 Jomaru-ro, Wonmi-gu, Bucheon 14584, Korea Tel: +82-32-621-5143 Fax: +82-32-621-6950 E-mail:
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33
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Lynn KS, Peterson RJ, Koval M. Ruffles and spikes: Control of tight junction morphology and permeability by claudins. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183339. [PMID: 32389670 DOI: 10.1016/j.bbamem.2020.183339] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/24/2020] [Accepted: 05/01/2020] [Indexed: 02/06/2023]
Abstract
Epithelial barrier function is regulated by a family of transmembrane proteins known as claudins. Functional tight junctions are formed when claudins interact with other transmembrane proteins, cytosolic scaffold proteins and the actin cytoskeleton. The predominant scaffold protein, zonula occludens-1 (ZO-1), directly binds to most claudin C-terminal domains, crosslinking them to the actin cytoskeleton. When imaged by immunofluorescence microscopy, tight junctions most frequently are linear structures that form between tricellular junctions. However, tight junctions also adapt non-linear architectures exhibiting either a ruffled or spiked morphology, which both are responses to changes in claudin engagement of actin filaments. Other terms for ruffled tight junctions include wavy, tortuous, undulating, serpentine or zig-zag junctions. Ruffling is under the control of hypoxia induced factor (HIF) and integrin-mediated signaling, as well as direct mechanical stimulation. Tight junction ruffling is specifically enhanced by claudin-2, antagonized by claudin-1 and requires claudin binding to ZO-1. Tight junction spikes are sites of active vesicle budding and fusion that appear as perpendicular projections oriented towards the nucleus. Spikes share molecular features with focal adherens junctions and tubulobulbar complexes found in Sertoli cells. Lung epithelial cells under stress form spikes due to an increase in claudin-5 expression that directly disrupts claudin-18/ZO-1 interactions. Together this suggests that claudins are not simply passive cargoes controlled by scaffold proteins. We propose a model where claudins specifically influence tight junction scaffold proteins to control interactions with the cytoskeleton as a mechanism that regulates tight junction assembly and function.
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Affiliation(s)
- K Sabrina Lynn
- Division of Pulmonary, Allergy Critical Care and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Raven J Peterson
- Division of Pulmonary, Allergy Critical Care and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Michael Koval
- Division of Pulmonary, Allergy Critical Care and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA; Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA.
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34
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Li Y, Guo R, Zhang M, Chen P, Li J, Sun Y. Protective effect of emodin on intestinal epithelial tight junction barrier integrity in rats with sepsis induced by cecal ligation and puncture. Exp Ther Med 2020; 19:3521-3530. [PMID: 32346413 PMCID: PMC7185184 DOI: 10.3892/etm.2020.8625] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 01/17/2020] [Indexed: 12/14/2022] Open
Abstract
The present study investigated the protective effects of emodin on intestinal epithelial tight junction (TJ) barrier integrity in cecal ligation and puncture (CLP)-induced septic rats and its possible mechanisms of action. Healthy male Sprague-Dawley rats were randomly divided into three groups (n=20 per group): Sham group, CLP group and CLP + emodin group. Animals were sacrificed at 12 and 24 h after the model was established. Abdominal aortic blood and specimens of the ileum were harvested for analysis. The histopathological changes in intestinal mucosa and the ultrastructures of intestinal epithelial cells were investigated using light microscopy and transmission electron microscopy. The integrity of the intestinal barrier was assessed by examining plasma diamine oxidase (DAO) levels and the ratio of urine lactulose to mannitol (L/M). The levels of the intestinal TJ proteins claudin-3, zonula occludens (ZO)-1 and occludin were detected using immunohistochemistry, western blotting and reverse transcription-quantitative PCR. The results showed that the pathological damage to intestinal mucosa and the intestinal tissue injury score in the CLP + emodin group were significantly reduced compared to those of the CLP group, and the differences were more obvious at 24 h compared with 12 h. DAO activity and the L/M ratio in the emodin pre-treatment group decreased significantly at 24 h compared with the CLP groups. The protein and mRNA levels of the TJ proteins claudin-3, ZO-1 and occludin in the emodin pre-treatment groups at 12 and 24 h were increased, while occludin mRNA level was found to be decreased compared with the CLP groups. The present study suggested that emodin may significantly reduce the damage to the intestinal epithelial barrier in sepsis, inhibit intestinal barrier permeability and protect intestinal barrier integrity. Emodin may protect intestinal barrier integrity by elevating expression levels of the TJ proteins claudin-3, ZO-1 and occludin in CLP rats.
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Affiliation(s)
- Yanjun Li
- Department of Emergency, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200062, P.R. China
| | - Ruimin Guo
- Department of Emergency, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200062, P.R. China
| | - Mengying Zhang
- Department of Emergency, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200062, P.R. China
| | - Peng Chen
- Department of Emergency, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200062, P.R. China
| | - Jingxin Li
- Department of Emergency, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200062, P.R. China
| | - Yanni Sun
- Department of Emergency, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200062, P.R. China.,Department of Emergency, Shanghai Putuo Central School of Clinical Medicine, Anhui Medical University, Shanghai 200062, P.R. China
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Clément CM, Deffieu MS, Dorobantu CM, Baumert TF, Ayala‐Nunez NV, Mély Y, Ronde P, Gaudin R. Characterisation of endogenous Claudin‐1 expression, motility and susceptibility to hepatitis C virus in CRISPR knock‐in cells. Biol Cell 2020; 112:140-151. [DOI: 10.1111/boc.201900085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 01/30/2020] [Indexed: 01/06/2023]
Affiliation(s)
- Camille M.H. Clément
- CNRSIRIM Institut de Recherche en infectiologie de Montpellier Montpellier 34293 France
- Université de Montpellier Montpellier 34090 France
- Inserm U1110Institut de Recherche sur les Maladies Virales et Hépatiques (IVH) Strasbourg 67000 France
- Université de Strasbourg Strasbourg 67000 France
| | - Maika S. Deffieu
- CNRSIRIM Institut de Recherche en infectiologie de Montpellier Montpellier 34293 France
- Université de Montpellier Montpellier 34090 France
| | - Cristina M. Dorobantu
- Inserm U1110Institut de Recherche sur les Maladies Virales et Hépatiques (IVH) Strasbourg 67000 France
- Université de Strasbourg Strasbourg 67000 France
| | - Thomas F. Baumert
- Inserm U1110Institut de Recherche sur les Maladies Virales et Hépatiques (IVH) Strasbourg 67000 France
- Université de Strasbourg Strasbourg 67000 France
- Pole Hépato‐digestifHôpitaux Universitaires de StrasbourgInstitut Hospitalo‐universitaire Strasbourg 67000 France
| | - Nilda Vanesa Ayala‐Nunez
- CNRSIRIM Institut de Recherche en infectiologie de Montpellier Montpellier 34293 France
- Université de Montpellier Montpellier 34090 France
- Inserm U1110Institut de Recherche sur les Maladies Virales et Hépatiques (IVH) Strasbourg 67000 France
- Université de Strasbourg Strasbourg 67000 France
| | - Yves Mély
- Université de Strasbourg Strasbourg 67000 France
- CNRS UMR 7021Laboratoire de Bioimagerie et PathologiesFaculté de pharmacie Illkirch 67401 France
| | - Philippe Ronde
- Université de Strasbourg Strasbourg 67000 France
- CNRS UMR 7021Laboratoire de Bioimagerie et PathologiesFaculté de pharmacie Illkirch 67401 France
| | - Raphael Gaudin
- CNRSIRIM Institut de Recherche en infectiologie de Montpellier Montpellier 34293 France
- Université de Montpellier Montpellier 34090 France
- Inserm U1110Institut de Recherche sur les Maladies Virales et Hépatiques (IVH) Strasbourg 67000 France
- Université de Strasbourg Strasbourg 67000 France
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36
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Molecular organization and function of vertebrate septate-like junctions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183211. [PMID: 32032590 DOI: 10.1016/j.bbamem.2020.183211] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 01/22/2020] [Accepted: 01/26/2020] [Indexed: 12/21/2022]
Abstract
Septate-like junctions display characteristic ladder-like ultrastructure reminiscent of the invertebrate epithelial septate junctions and are present at the paranodes of myelinated axons. The paranodal junctions where the myelin loops attach to the axon at the borders of the node of Ranvier provide both a paracellular barrier to ion diffusion and a lateral fence along the axonal membrane. The septate-like junctions constrain the proper distribution of nodal Na+ channels and juxtaparanodal K+ channels, which are required for the safe propagation of the nerve influx and rapid saltatory conduction. The paranodal cell adhesion molecules have been identified as target antigens in peripheral demyelinating autoimmune diseases and the pathogenic mechanisms described. This review aims at presenting the recent knowledge on the molecular and structural organization of septate-like junctions, their formation and stabilization during development, and how they are involved in demyelinating diseases.
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Role of Claudin Proteins in Regulating Cancer Stem Cells and Chemoresistance-Potential Implication in Disease Prognosis and Therapy. Int J Mol Sci 2019; 21:ijms21010053. [PMID: 31861759 PMCID: PMC6982342 DOI: 10.3390/ijms21010053] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 12/11/2022] Open
Abstract
Claudins are cell–cell adhesion proteins, which are expressed in tight junctions (TJs), the most common apical cell-cell adhesion. Claudin proteins help to regulate defense and barrier functions, as well as differentiation and polarity in epithelial and endothelial cells. A series of studies have now reported dysregulation of claudin proteins in cancers. However, the precise mechanisms are still not well understood. Nonetheless, studies have clearly demonstrated a causal role of multiple claudins in the regulation of epithelial to mesenchymal transition (EMT), a key feature in the acquisition of a cancer stem cell phenotype in cancer cells. In addition, claudin proteins are known to modulate therapy resistance in cancer cells, a feature associated with cancer stem cells. In this review, we have focused primarily on highlighting the causal link between claudins, cancer stem cells, and therapy resistance. We have also contemplated the significance of claudins as novel targets in improving the efficacy of cancer therapy. Overall, this review provides a much-needed understanding of the emerging role of claudin proteins in cancer malignancy and therapeutic management.
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Pandit R, Chen L, Götz J. The blood-brain barrier: Physiology and strategies for drug delivery. Adv Drug Deliv Rev 2019; 165-166:1-14. [PMID: 31790711 DOI: 10.1016/j.addr.2019.11.009] [Citation(s) in RCA: 252] [Impact Index Per Article: 50.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 11/19/2019] [Accepted: 11/24/2019] [Indexed: 12/14/2022]
Abstract
The blood-brain barrier (BBB) is a dynamic structure that functions as a gatekeeper, reflecting the unique requirements of the brain. In this review, following a brief historical overview of how the concepts of the BBB and the neurovascular unit (NVU) developed, we describe its physiology and architecture, which pose a particular challenge to therapeutic intervention. We then discuss how the restrictive nature of this barrier can be overcome for the delivery of therapeutic agents. Alterations to drug formulation offer one option, in part by utilizing distinct transport modes; another is invasive or non-invasive strategies to bypass the BBB. An emerging non-invasive technology for targeted drug delivery is focused ultrasound that allows for the safe and reversible disruption of the BBB. We discuss the underlying mechanisms and provide an outlook, emphasizing the need for more research into the NVU and investment in innovative technologies to overcome the BBB for drug delivery.
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Affiliation(s)
- Rucha Pandit
- Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Liyu Chen
- Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Jürgen Götz
- Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia.
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Rajagopal N, Irudayanathan FJ, Nangia S. Computational Nanoscopy of Tight Junctions at the Blood-Brain Barrier Interface. Int J Mol Sci 2019; 20:E5583. [PMID: 31717316 PMCID: PMC6888702 DOI: 10.3390/ijms20225583] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/05/2019] [Accepted: 11/06/2019] [Indexed: 12/16/2022] Open
Abstract
The selectivity of the blood-brain barrier (BBB) is primarily maintained by tight junctions (TJs), which act as gatekeepers of the paracellular space by blocking blood-borne toxins, drugs, and pathogens from entering the brain. The BBB presents a significant challenge in designing neurotherapeutics, so a comprehensive understanding of the TJ architecture can aid in the design of novel therapeutics. Unraveling the intricacies of TJs with conventional experimental techniques alone is challenging, but recently developed computational tools can provide a valuable molecular-level understanding of TJ architecture. We employed the computational methods toolkit to investigate claudin-5, a highly expressed TJ protein at the BBB interface. Our approach started with the prediction of claudin-5 structure, evaluation of stable dimer conformations and nanoscale assemblies, followed by the impact of lipid environments, and posttranslational modifications on these claudin-5 assemblies. These led to the study of TJ pores and barriers and finally understanding of ion and small molecule transport through the TJs. Some of these in silico, molecular-level findings, will need to be corroborated by future experiments. The resulting understanding can be advantageous towards the eventual goal of drug delivery across the BBB. This review provides key insights gleaned from a series of state-of-the-art nanoscale simulations (or computational nanoscopy studies) performed on the TJ architecture.
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Affiliation(s)
| | | | - Shikha Nangia
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA
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40
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Effects of Claudin-1 on the Action of Clostridium perfringens Enterotoxin in Caco-2 Cells. Toxins (Basel) 2019; 11:toxins11100582. [PMID: 31601044 PMCID: PMC6832201 DOI: 10.3390/toxins11100582] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/01/2019] [Accepted: 10/03/2019] [Indexed: 12/11/2022] Open
Abstract
Clostridium perfringens enterotoxin (CPE) contributes to diarrhea and an often-lethal enterotoxemia. CPE action starts when it binds to claudin receptors, forming a small complex (90 kDa). Six small complexes then oligomerize to create prepores, followed by insertion of beta-hairpins from CPE to form beta-barrel pores named CH-1 or CH-2. Of the ~27 members of the human claudin protein family, only some bind CPE. However, both receptor claudins and the nonreceptor claudin-1 (CLDN-1) are associated with the small and CH-1/CH-2 CPE complexes. Therefore, this study evaluated whether claudin-1 affects CPE action by generating a CLDN-1 null mutant in Caco-2 cells using CRISPR-Cas9. Compared to wild-type Caco-2 cells, paracellular permeability of the CLDN-1 mutant was significantly enhanced, suggesting that claudin-1 may reduce CPE absorption during enterotoxemia. The CLDN-1 mutant was also markedly more sensitive than wild-type Caco-2 cells to apically-applied CPE. The mechanism behind this increased sensitivity involved higher CPE binding by the CLDN-1 mutant vs. wild-type Caco-2 cells, which led to more CH-1/CH-2 complex formation. However, the CH-1/CH-2 complexes formed by the CLDN-1 mutant were less stable or trypsin resistant than those of wild-type cells. These results indicate that, although a nonreceptor, CLDN-1 positively and negatively influences CPE action.
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41
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Fang R, Uchiyama R, Sakai S, Hara H, Tsutsui H, Suda T, Mitsuyama M, Kawamura I, Tsuchiya K. ASC and NLRP3 maintain innate immune homeostasis in the airway through an inflammasome-independent mechanism. Mucosal Immunol 2019; 12:1092-1103. [PMID: 31278375 DOI: 10.1038/s41385-019-0181-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 05/29/2019] [Accepted: 06/06/2019] [Indexed: 02/07/2023]
Abstract
It is widely accepted that inflammasomes protect the host from microbial pathogens by inducing inflammatory responses through caspase-1 activation. Here, we show that the inflammasome components ASC and NLRP3 are required for resistance to pneumococcal pneumonia, whereas caspase-1 and caspase-11 are dispensable. In the lung of S. pneumoniae-infected mice, ASC and NLRP3, but not caspase-1/11, were required for optimal expression of several mucosal innate immune proteins. Among them, TFF2 and intelectin-1 appeared to be protective against pneumococcal pneumonia. During infection, ASC and NLRP3 maintained the expression of the transcription factor SPDEF, which can facilitate the expression of the mucosal defense factor genes. Moreover, activation of STAT6, a key regulator of Spdef expression, depended on ASC and NLRP3. Overexpression of these inflammasome proteins sustained STAT6 phosphorylation induced by type 2 cytokines. Collectively, this study suggests that ASC and NLRP3 promote airway mucosal innate immunity by an inflammasome-independent mechanism involving the STAT6-SPDEF pathway.
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Affiliation(s)
- Rendong Fang
- College of Animal Science and Technology, Southwest University, Chongqing, 400715, China.,Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, 606-8501, Japan
| | - Ryosuke Uchiyama
- Department of Microbiology, Hyogo College of Medicine, Nishinomiya, 663-8501, Japan.,School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, 663-8179, Japan
| | - Shunsuke Sakai
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, 606-8501, Japan.,T Lymphocyte Biology Unit, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Hideki Hara
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, 606-8501, Japan.,Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Hiroko Tsutsui
- Department of Microbiology, Hyogo College of Medicine, Nishinomiya, 663-8501, Japan
| | - Takashi Suda
- Division of Immunology and Molecular Biology, Cancer Research Institute, Kanazawa University, Kakuma-Machi, Kanazawa, 920-1192, Japan
| | - Masao Mitsuyama
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, 606-8501, Japan.,Hakubi Center, Kyoto University, Kyoto, 606-8501, Japan
| | - Ikuo Kawamura
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, 606-8501, Japan
| | - Kohsuke Tsuchiya
- Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto, 606-8501, Japan. .,Division of Immunology and Molecular Biology, Cancer Research Institute, Kanazawa University, Kakuma-Machi, Kanazawa, 920-1192, Japan. .,Institute for Frontier Science Initiative (InFiniti), Kanazawa University, Kanazawa, 920-1192, Japan.
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42
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Claudin-9 structures reveal mechanism for toxin-induced gut barrier breakdown. Proc Natl Acad Sci U S A 2019; 116:17817-17824. [PMID: 31434788 DOI: 10.1073/pnas.1908929116] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The human pathogenic bacterium Clostridium perfringens secretes an enterotoxin (CpE) that targets claudins through its C-terminal receptor-binding domain (cCpE). Isoform-specific binding by CpE causes dissociation of claudins and tight junctions (TJs), resulting in cytotoxicity and breakdown of the gut epithelial barrier. Here, we present crystal structures of human claudin-9 (hCLDN-9) in complex with cCpE at 3.2 and 3.3 Å. We show that hCLDN-9 is a high-affinity CpE receptor and that hCLDN-9-expressing cells undergo cell death when treated with CpE but not cCpE, which lacks its cytotoxic domain. Structures reveal cCpE-induced alterations to 2 epitopes known to enable claudin self-assembly and expose high-affinity interactions between hCLDN-9 and cCpE that explain isoform-specific recognition. These findings elucidate the molecular bases for hCLDN-9 selective ion permeability and binding by CpE, and provide mechanisms for how CpE disrupts gut homeostasis by dissociating claudins and TJs to affect epithelial adhesion and intercellular transport.
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43
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Kyuno D, Bauer N, Schnölzer M, Provaznik J, Ryschich E, Hackert T, Zöller M. Distinct Origin of Claudin7 in Early Tumor Endosomes Affects Exosome Assembly. Int J Biol Sci 2019; 15:2224-2239. [PMID: 31592143 PMCID: PMC6775303 DOI: 10.7150/ijbs.35347] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 07/11/2019] [Indexed: 12/28/2022] Open
Abstract
Microvesicles are the body's most powerful intercellular communication system and cancer-initiating cell microvesicles (CIC-TEX) reprogram Non-CIC towards fortified malignancy. Claudin7, a CIC-biomarker in gastrointestinal tumors, is recovered in TEX. Recent evidence suggesting individual cells delivering distinct microvesicles became of particular interest for claudin7, which is part of tight junctions (TJ) and glycolipid-enriched membrane domains (GEM), GEM-located claudin7 is palmitoylated. This offered the unique possibility of exploring the contribution of a CIC marker and its origin from distinct membrane domains on CIC-TEX biogenesis and activities. Proteome and miRNA analysis of wild-type, claudin7-knockdown and a rescue with claudin7 harboring a mutated palmitoylation site (mP) of a rat pancreatic and a human colon cancer line uncovered significant, only partly overlapping contributions of palmitoylated and non-palmitoylated claudin7 to TEX composition. Palmitoylated claudin7 facilitates GEM-integrated plasma membrane and associated signaling molecule recruitment; non-palmitoylated claudin7 supports recruitment of trafficking components, proteins engaged in fatty acid metabolism and TJ proteins into TEX. Claudin7mP also assists TEX recovery of selected miRNA. Thus, distinctly located claudin7 affects CIC-TEX composition and TJ-derived cld7 might play a unique role in equipping CIC-TEX with transporters and lipid metabolism-regulating molecules, awareness of distinct TEX populations being crucial facing therapeutic translation.
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Affiliation(s)
- Daisuke Kyuno
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Germany.,Department of Surgery, Surgical Oncology and Science, Sapporo Medical University, Sapporo, Japan
| | - Nathalie Bauer
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Germany
| | | | | | - Eduard Ryschich
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Germany
| | - Margot Zöller
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Germany
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Abstract
Cancer-initiating cells (CIC) are the driving force in tumor progression. There is strong evidence that CIC fulfill this task via exosomes (TEX), which modulate and reprogram stroma, nontransformed cells, and non-CIC. Characterization of CIC, besides others, builds on expression of CIC markers, many of which are known as metastasis-associated molecules. We here discuss that the linkage between CIC/CIC-TEX and metastasis-associated molecules is not fortuitously, but relies on the contribution of these markers to TEX biogenesis including loading and TEX target interactions. In addition, CIC markers contribute to TEX binding- and uptake-promoted activation of signaling cascades, transcription initiation, and translational control. Our point of view will be outlined for pancreas and colon CIC highly expressing CD44v6, Tspan8, EPCAM, claudin7, and LGR5, which distinctly but coordinately contribute to tumor progression. Despite overwhelming progress in unraveling the metastatic cascade and the multiple tasks taken over by CIC-TEX, there remains a considerable gap in linking CIC biomarkers, TEX, and TEX-initiated target modulation with metastasis. We will try to outline possible bridges, which could allow depicting pathways for new and expectedly powerful therapeutic interference with tumor progression.
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Affiliation(s)
- Zhe Wang
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China.
| | - Margot Zöller
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China.
- Pancreas Section, University Hospital of Surgery, Heidelberg, Germany.
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Abstract
The term blood-bile barrier (BBlB) refers to the physical structure within a hepatic lobule that compartmentalizes and hence segregates sinusoidal blood from canalicular bile. Thus, this barrier provides physiological protection in the liver, shielding the hepatocytes from bile toxicity and restricting the mixing of blood and bile. BBlB is primarily composed of tight junctions; however, adherens junction, desmosomes, gap junctions, and hepatocyte bile transporters also contribute to the barrier function of the BBlB. Recent findings also suggest that disruption of BBlB is associated with major hepatic diseases characterized by cholestasis and aberrations in BBlB thus may be a hallmark of many chronic liver diseases. Several molecular signaling pathways have now been shown to play a role in regulating the structure and function and eventually contribute to regulation of the BBlB function within the liver. In this review, we will discuss the structure and function of the BBlB, summarize the methods to assess the integrity and function of BBlB, discuss the role of BBlB in liver pathophysiology, and finally, discuss the mechanisms of BBlB regulation. Collectively, this review will demonstrate the significance of the BBlB in both liver homeostasis and hepatic dysfunction.
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Affiliation(s)
- Tirthadipa Pradhan-Sundd
- *Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- †Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Satdarshan Pal Monga
- *Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- †Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- ‡Pittsburgh Liver Research Center, University of Pittsburgh School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, PA, USA
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46
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Zeisel MB, Dhawan P, Baumert TF. Tight junction proteins in gastrointestinal and liver disease. Gut 2019; 68:547-561. [PMID: 30297438 PMCID: PMC6453741 DOI: 10.1136/gutjnl-2018-316906] [Citation(s) in RCA: 175] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 08/16/2018] [Accepted: 08/19/2018] [Indexed: 12/11/2022]
Abstract
Over the past two decades a growing body of evidence has demonstrated an important role of tight junction (TJ) proteins in the physiology and disease biology of GI and liver disease. On one side, TJ proteins exert their functional role as integral proteins of TJs in forming barriers in the gut and the liver. Furthermore, TJ proteins can also be expressed outside TJs where they play important functional roles in signalling, trafficking and regulation of gene expression. A hallmark of TJ proteins in disease biology is their functional role in epithelial-to-mesenchymal transition. A causative role of TJ proteins has been established in the pathogenesis of colorectal cancer and gastric cancer. Among the best characterised roles of TJ proteins in liver disease biology is their function as cell entry receptors for HCV-one of the most common causes of hepatocellular carcinoma. At the same time TJ proteins are emerging as targets for novel therapeutic approaches for GI and liver disease. Here we review our current knowledge of the role of TJ proteins in the pathogenesis of GI and liver disease biology and discuss their potential as therapeutic targets.
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Affiliation(s)
- Mirjam B. Zeisel
- Inserm U1052, CNRS UMR 5286, Cancer Research Center of Lyon (CRCL), Université de Lyon (UCBL), Lyon, France
- Inserm, U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
| | - Punita Dhawan
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE
- Buffet Cancer Center, University of Nebraska Medical Center, Omaha, NE
- VA Nebraska-Western Iowa Health Care System, Omaha, NE
| | - Thomas F. Baumert
- Inserm, U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
- Institut Hospitalo-Universitaire, Pôle hépato-digestif, Nouvel Hôpital Civil, Strasbourg, France
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47
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Cherradi S, Martineau P, Gongora C, Del Rio M. Claudin gene expression profiles and clinical value in colorectal tumors classified according to their molecular subtype. Cancer Manag Res 2019; 11:1337-1348. [PMID: 30863148 PMCID: PMC6389001 DOI: 10.2147/cmar.s188192] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Purpose Colorectal cancer (CRC) is a heterogeneous disease that can be classified into distinct molecular subtypes. The aims of this study were 1) to compare claudin (CLDN) gene expression in CRC samples and normal colon mucosa, and then in the different CRC molecular subtypes, and 2) to assess their prognostic value. Patients and methods CLDN expression in CRC samples was analyzed using gene expression data for a cohort of 143 primary CRC samples, and compared in the same CRC samples classified into different molecular subtypes (C1 to C6 according to the Marisa's classification, and CMS1 to CMS4 of the consensus classification). Comparison of CLDN expression in normal and tumor colon samples was also made on a smaller number of samples. Then, the relationship between CLDN expression profiles and overall survival (OS) and progression-free survival was examined. Results Compared with normal mucosa, CLDN1 and CLDN2 were upregulated, whereas CLDN5, 7, 8, and 23 were downregulated in CRC samples. Variations in CLDN expression profiles were observed mainly in the CMS2/C1 and CMS4/C4 subtypes. Overall, expression of CLDN2 or CLDN4 alone had a strong prognostic value that increased when they were associated. In the CMS4/C4 subtypes, lower expressions of CLDN11, CLDN12, and CLDN23 were associated with longer OS. Conversely, in the CMS2 and C1 subtypes, low CLDN23 expression was associated with shorter OS and progression-free survival, suggesting a dual role for CLDN23 as a tumor suppressor/promoter in CRC. CLDN6 and CLDN11 had a prognostic value in the CMS2 and C4 subtypes, respectively. Conclusion This analysis of CLDN gene expression profiles and prognostic value in CRC samples classified according to their molecular subtype shows that CRC heterogeneity must be taken into account when assessing CLDN potential value as prognostic markers or therapeutic targets.
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Affiliation(s)
- Sara Cherradi
- Institut de Recherche en Cancérologie de Montpellier (IRCM), INSERM U1194, Université de Montpellier, Institut régional du Cancer de Montpellier, Montpellier F-34298, France,
| | - Pierre Martineau
- Institut de Recherche en Cancérologie de Montpellier (IRCM), INSERM U1194, Université de Montpellier, Institut régional du Cancer de Montpellier, Montpellier F-34298, France,
| | - Céline Gongora
- Institut de Recherche en Cancérologie de Montpellier (IRCM), INSERM U1194, Université de Montpellier, Institut régional du Cancer de Montpellier, Montpellier F-34298, France,
| | - Maguy Del Rio
- Institut de Recherche en Cancérologie de Montpellier (IRCM), INSERM U1194, Université de Montpellier, Institut régional du Cancer de Montpellier, Montpellier F-34298, France,
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48
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Duran D, Zeng X, Jin SC, Choi J, Nelson-Williams C, Yatsula B, Gaillard J, Furey CG, Lu Q, Timberlake AT, Dong W, Sorscher MA, Loring E, Klein J, Allocco A, Hunt A, Conine S, Karimy JK, Youngblood MW, Zhang J, DiLuna ML, Matouk CC, Mane S, Tikhonova IR, Castaldi C, López-Giráldez F, Knight J, Haider S, Soban M, Alper SL, Komiyama M, Ducruet AF, Zabramski JM, Dardik A, Walcott BP, Stapleton CJ, Aagaard-Kienitz B, Rodesch G, Jackson E, Smith ER, Orbach DB, Berenstein A, Bilguvar K, Vikkula M, Gunel M, Lifton RP, Kahle KT. Mutations in Chromatin Modifier and Ephrin Signaling Genes in Vein of Galen Malformation. Neuron 2019; 101:429-443.e4. [PMID: 30578106 DOI: 10.1016/j.neuron.2018.11.041] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 10/12/2018] [Accepted: 11/20/2018] [Indexed: 02/05/2023]
Abstract
Normal vascular development includes the formation and specification of arteries, veins, and intervening capillaries. Vein of Galen malformations (VOGMs) are among the most common and severe neonatal brain arterio-venous malformations, shunting arterial blood into the brain's deep venous system through aberrant direct connections. Exome sequencing of 55 VOGM probands, including 52 parent-offspring trios, revealed enrichment of rare damaging de novo mutations in chromatin modifier genes that play essential roles in brain and vascular development. Other VOGM probands harbored rare inherited damaging mutations in Ephrin signaling genes, including a genome-wide significant mutation burden in EPHB4. Inherited mutations showed incomplete penetrance and variable expressivity, with mutation carriers often exhibiting cutaneous vascular abnormalities, suggesting a two-hit mechanism. The identified mutations collectively account for ∼30% of studied VOGM cases. These findings provide insight into disease biology and may have clinical implications for risk assessment.
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Affiliation(s)
- Daniel Duran
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Xue Zeng
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Sheng Chih Jin
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA; Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA
| | - Jungmin Choi
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA; Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA
| | | | - Bogdan Yatsula
- Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Jonathan Gaillard
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | | | - Qiongshi Lu
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, Madison, WI, USA
| | | | - Weilai Dong
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Michelle A Sorscher
- Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Erin Loring
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Jennifer Klein
- Department of Neurosurgery, Boston Children's Hospital, Boston, MA, USA
| | - August Allocco
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Ava Hunt
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Sierra Conine
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Jason K Karimy
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Mark W Youngblood
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA; Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Jinwei Zhang
- Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, Hatherly Laboratory, Exeter, UK
| | - Michael L DiLuna
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Charles C Matouk
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA
| | - Shrikant Mane
- Yale Center for Genome Analysis, West Haven, CT, USA
| | | | | | | | - James Knight
- Yale Center for Genome Analysis, West Haven, CT, USA
| | - Shozeb Haider
- University College London, School of Pharmacy, London, UK
| | - Mariya Soban
- University College London, School of Pharmacy, London, UK; Department of Biochemistry, Aligarh Muslim University, Aligarh, India
| | - Seth L Alper
- Division of Nephrology and Center for Vascular Biology Research, Beth Israel Deaconess Medical Center, and Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Masaki Komiyama
- Department of Neurointervention, Osaka City General Hospital, Osaka, Japan
| | - Andrew F Ducruet
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, AZ, USA
| | - Joseph M Zabramski
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, AZ, USA
| | - Alan Dardik
- Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Brian P Walcott
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA
| | - Christopher J Stapleton
- Department of Neurological Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | | | - Georges Rodesch
- Service de Neuroradiologie Diagnostique et Thérapeutique, Hôpital Foch, Suresnes, France
| | - Eric Jackson
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Edward R Smith
- Department of Neurointerventional Radiology, Boston Children's Hospital, Boston, MA, USA
| | - Darren B Orbach
- Department of Neurosurgery, Boston Children's Hospital, Boston, MA, USA; Department of Neurointerventional Radiology, Boston Children's Hospital, Boston, MA, USA
| | - Alejandro Berenstein
- Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kaya Bilguvar
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA; Yale Center for Genome Analysis, West Haven, CT, USA
| | - Miikka Vikkula
- Human Molecular Genetics, de Duve Institute, Université Catholique de Louvain, Brussels, Belgium
| | - Murat Gunel
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA; Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Richard P Lifton
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA; Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA
| | - Kristopher T Kahle
- Department of Neurosurgery, Yale School of Medicine, New Haven, CT, USA; Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA; Department of Cellular and Molecular Physiology, Yale School of Medicine, New Haven, CT, USA.
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49
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Deng Z, Chen M, Xie H, Jian D, Xu S, Peng Q, Sha K, Liu Y, Zhang Y, Shi W, Li J. Claudin reduction may relate to an impaired skin barrier in rosacea. J Dermatol 2019; 46:314-321. [PMID: 30714633 DOI: 10.1111/1346-8138.14792] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 01/03/2019] [Indexed: 12/28/2022]
Affiliation(s)
- Zhili Deng
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province Central South University Changsha China
| | - Mengting Chen
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
| | - Hongfu Xie
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province Central South University Changsha China
| | - Dan Jian
- Department of Dermatology Xiangya Hospital Central South University Changsha China
| | - San Xu
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
| | - Qinqin Peng
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
| | - Ke Sha
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
| | - Yingzi Liu
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
| | - Yiya Zhang
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province Central South University Changsha China
| | - Wei Shi
- Department of Dermatology Xiangya Hospital Central South University Changsha China
| | - Ji Li
- Department of Dermatology Xiangya Hospital Central South University Changsha China
- Center for Molecular Medicine Xiangya Hospital Central South University Changsha China
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province Central South University Changsha China
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50
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Mu W, Wang Z, Zöller M. Ping-Pong-Tumor and Host in Pancreatic Cancer Progression. Front Oncol 2019; 9:1359. [PMID: 31921628 PMCID: PMC6927459 DOI: 10.3389/fonc.2019.01359] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 11/18/2019] [Indexed: 12/12/2022] Open
Abstract
Metastasis is the main cause of high pancreatic cancer (PaCa) mortality and trials dampening PaCa mortality rates are not satisfying. Tumor progression is driven by the crosstalk between tumor cells, predominantly cancer-initiating cells (CIC), and surrounding cells and tissues as well as distant organs, where tumor-derived extracellular vesicles (TEX) are of major importance. A strong stroma reaction, recruitment of immunosuppressive leukocytes, perineural invasion, and early spread toward the peritoneal cavity, liver, and lung are shared with several epithelial cell-derived cancer, but are most prominent in PaCa. Here, we report on the state of knowledge on the PaCIC markers Tspan8, alpha6beta4, CD44v6, CXCR4, LRP5/6, LRG5, claudin7, EpCAM, and CD133, which all, but at different steps, are engaged in the metastatic cascade, frequently via PaCIC-TEX. This includes the contribution of PaCIC markers to TEX biogenesis, targeting, and uptake. We then discuss PaCa-selective features, where feedback loops between stromal elements and tumor cells, including distorted transcription, signal transduction, and metabolic shifts, establish vicious circles. For the latter particularly pancreatic stellate cells (PSC) are responsible, furnishing PaCa to cope with poor angiogenesis-promoted hypoxia by metabolic shifts and direct nutrient transfer via vesicles. Furthermore, nerves including Schwann cells deliver a large range of tumor cell attracting factors and Schwann cells additionally support PaCa cell survival by signaling receptor binding. PSC, tumor-associated macrophages, and components of the dysplastic stroma contribute to perineural invasion with signaling pathway activation including the cholinergic system. Last, PaCa aggressiveness is strongly assisted by the immune system. Although rich in immune cells, only immunosuppressive cells and factors are recovered in proximity to tumor cells and hamper effector immune cells entering the tumor stroma. Besides a paucity of immunostimulatory factors and receptors, immunosuppressive cytokines, myeloid-derived suppressor cells, regulatory T-cells, and M2 macrophages as well as PSC actively inhibit effector cell activation. This accounts for NK cells of the non-adaptive and cytotoxic T-cells of the adaptive immune system. We anticipate further deciphering the molecular background of these recently unraveled intermingled phenomena may turn most lethal PaCa into a curatively treatable disease.
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Affiliation(s)
- Wei Mu
- School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- *Correspondence: Wei Mu
| | - Zhe Wang
- Department of Oncology, The First Affiliated Hospital of Guangdong, Pharmaceutical University, Guangzhou, China
| | - Margot Zöller
- Department of Oncology, The First Affiliated Hospital of Guangdong, Pharmaceutical University, Guangzhou, China
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