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      Tissular growth factors profile after teduglutide administration on an animal model of intestinal anastomosis Translated title: Perfil tisular de factores de crecimiento postadministración de teduglutida en un modelo animal de anastomosis intestinal

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          Abstract

          Abstract Background: Teduglutide is an enterotrophic analogue of glucagon-like peptide-2, with an indirect and poorly understood mechanism of action, approved for the rehabilitation of short-bowel syndrome. This study aims to analyze the response of tissue growth factors to surgical injury and teduglutide administration on an animal model of intestinal anastomosis. Methods: Wistar rats (n = 59) were distributed into four groups: "ileal resection" or "laparotomy", each one subdivided into "postoperative teduglutide administration" or "no treatment"; and sacrificed at the third or the seventh day, with ileal sample harvesting. Gene expression of insulin-like growth factor 1 (Igf1), vascular endothelial growth factor a (Vegfa), transforming growth factor β1 (Tgfβ1), connective tissue growth factor (Ctgf), fibroblast growth factor 2 (Fgf2), fibroblast growth factor 7 (Fgf7), epidermal growth factor (Egf), heparin-binding epidermal-like growth factor (Hbegf), platelet-derived growth factor b (Pdgfb) and glucagon-like peptide 2 receptor (Glp2r) was studied by real-time polymerase chain reaction. Results: Upregulation of Fgf7, Fgf2, Egf, Vegfa and Glp2r at the third day and of Pdgf at the seventh day was verified in the perianastomotic segment. Teduglutide administration was associated with higher fold-change of relative gene expression of Vegfa (3.6 ± 1.3 vs. 1.9 ± 2.0, p = 0.0001), Hbegf (2.2 ± 2.3 vs. 1.1 ± 0.9, p = 0.001), Igf1 (1.6 ± 7.6 vs. 0.9 ± 0.7, p = 0.002) and Ctgf (1.1 ± 2.1 vs. 0.6 ± 2.0, Conclusions: Those results underscore the recognized role of Igf1 and Hbegf as molecular mediators of the effects of teduglutide and suggest that other humoral factors, like Vegf and Ctgf, may also be relevant in the perioperative context. Induction of Vegfa, Igf1 and Ctgf gene expressions might indicate a favorable influence of teduglutide on the intestinal anastomotic healing.

          Translated abstract

          Resumen Introducción: teduglutida es un análogo intestinotrófico do péptido-2 similar al glucagón, con un mecanismo de acción indirecto y poco conocido, aprobado para la rehabilitación del síndrome de intestino corto. Este estudio propone analizar la respuesta de los factores de crecimiento tisulares a la agresión quirúrgica y a la administración de teduglutida en un modelo animal de anastomosis intestinal. Métodos: ratones Wistar (n = 59) fueron distribuidos en cuatro grupos: "resección ileal" o "laparotomía", cada uno subdividido en "administración post-operatoria de teduglutida" o "sin tratamiento"; y sacrificados en el tercero o el séptimo día, con recogida de muestras ileales. La expresión génica de Igf1, Vegfa, Tgfβ1, Ctgf, Fgf2, Fgf7, Egf, Hbegf, Pdgfb y Glp2r fue analizada por qRT-PCR. Resultados: en el segmento perianastomótico se verificó una sobrerregulación de Fgf7, Fgf2, Egf, Vegfa y Glp2r al tercer día y de Pdg al séptimo día. La administración de teduglutida se asoció con mayor cambio de la expresión génica relativa de Vegfa (3.6 ± 1.3 vs. 1.9 ± 2.0, p = 0.0001), Hbegf (2.2 ± 2.3 vs. 1.1 ± 0.9, p = 0.001), Igf1 (1.6 ± 7.6 vs. 0.9 ± 0.7, p = 0.002) y Ctgf (1.1 ± 2.1 vs. 0.6 ± 2.0, p = 0.013); y menor cambio de Tgfβ1, Fgf7 y Glp2r. Conclusiones: estos resultados refuerzan el reconocido papel de Igf1 y Hbegf como mediadores moleculares de los efectos de la teduglutida y sugieren que otros factores humorales, como Vegf y Ctgf, también pueden ser relevantes en el contexto perioperatorio. La inducción de las expresiones de los genes Vegfa, Igf1 y Ctgf podría indicar una influencia favorable de teduglutida en la cicatrización anastomótica intestinal.

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          Current understanding of molecular and cellular mechanisms in fibroplasia and angiogenesis during acute wound healing.

          Cutaneous wound healing ultimately functions to facilitate barrier restoration following injury-induced loss of skin integrity. It is an evolutionarily conserved, multi-cellular, multi-molecular process involving co-ordinated inter-play between complex signalling networks. Cellular proliferation is recognised as the third stage of this sequence. Within this phase, fibroplasia and angiogenesis are co-dependent processes which must be successfully completed in order to form an evolving extracellular matrix and granulation tissue. The resultant structures guide cellular infiltration, differentiation and secretory profile within the wound environment and consequently have major influence on the success or failure of wound healing. This review integrates in vitro, animal and human in vivo studies, to provide up to date descriptions of molecular and cellular interactions involved in fibroplasia and angiogenesis. Significant molecular networks include adhesion molecules, proteinases, cytokines and chemokines as well as a plethora of growth factors. These signals are produced by, and affect behaviour of, cells including fibroblasts, fibrocytes, keratinocytes, endothelial cells and inflammatory cells resulting in significant cellular phenotypic and functional plasticity, as well as controlling composition and remodelling of structural proteins including collagen and fibronectin. The interdependent relationship between angiogenesis and fibroplasia relies on dynamic reciprocity between cellular components, matrix proteins and bioactive molecules. Unbalanced regulation of any one component can have significant consequences resulting in delayed healing, chronic wounds or abnormal scar formation. Greater understanding of angiogenic and fibroplastic mechanisms underlying chronic wound pathogenesis has identified novel therapeutic targets and enabled development of improved treatment strategies including topical growth factors and skin substitutes. Copyright © 2013 Japanese Society for Investigative Dermatology. Published by Elsevier Ireland Ltd. All rights reserved.
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            Physiology and pharmacology of the enteroendocrine hormone glucagon-like peptide-2.

            Glucagon-like peptide-2 (GLP-2) is a 33-amino-acid proglucagon-derived peptide secreted from enteroendocrine L cells. GLP-2 circulates at low basal levels in the fasting period, and plasma levels rise rapidly after food ingestion. Renal clearance and enzymatic inactivation control the elimination of bioactive GLP-2. GLP-2 increases mesenteric blood flow and activates proabsorptive pathways in the gut, facilitating nutrient absorption. GLP-2 also enhances gut barrier function and induces proliferative and cytoprotective pathways in the small bowel. The actions of GLP-2 are transduced via a single G protein-coupled receptor (GLP-2R), expressed predominantly within the gastrointestinal tract. Disruption of GLP-2R signaling increases susceptibility to gut injury and impairs the adaptive mucosal response to refeeding. Sustained augmentation of GLP-2R signaling reduces the requirement for parenteral nutrition in human subjects with short-bowel syndrome. Hence GLP-2 integrates nutrient-derived signals to optimize mucosal integrity and energy absorption.
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              Cellular and molecular mechanisms of intestinal fibrosis.

              Fibrosis is a chronic and progressive process characterized by an excessive accumulation of extracellular matrix (ECM) leading to stiffening and/or scarring of the involved tissue. Intestinal fibrosis may develop in several different enteropathies, including inflammatory bowel disease. It develops through complex cell, extracellular matrix, cytokine and growth factor interactions. Distinct cell types are involved in intestinal fibrosis, such as resident mesenchymal cells (fibroblasts, myofibroblasts and smooth muscle cells) but also ECM-producing cells derived from epithelial and endothelial cells (through a process termed epithelial- and endothelial-mesenchymal transition), stellate cells, pericytes, local or bone marrow-derived stem cells. The most important soluble factors that regulate the activation of these cells include cytokines, chemokines, growth factors, components of the renin-angiotensin system, angiogenic factors, peroxisome proliferator-activated receptors, mammalian target of rapamycin, and products of oxidative stress. It soon becomes clear that although inflammation is responsible for triggering the onset of the fibrotic process, it only plays a minor role in the progression of this condition, as fibrosis may advance in a self-perpetuating fashion. Definition of the cellular and molecular mechanisms involved in intestinal fibrosis may provide the key to developing new therapeutic approaches.
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                Author and article information

                Journal
                nh
                Nutrición Hospitalaria
                Nutr. Hosp.
                Grupo Arán (Madrid, Madrid, Spain )
                0212-1611
                1699-5198
                February 2018
                : 35
                : 1
                : 185-193
                Affiliations
                [4] Coimbra orgnameUniversity of Medicine orgdiv1Faculty of Medicine orgdiv2Center for Neuroscience and Cell Biology (CNC) and Institute for Biomedical Imaging and Life Sciences (IBILI) Portugal
                [1] Coimbra orgnameCentro Hospitalar e Universitário de Coimbra, EPE orgdiv1Coimbra University Hospital orgdiv2Department of Surgery A Portugal
                [8] Coimbra orgnameCentro Hospitalar e Universitário de Coimbra, EPE orgdiv1Coimbra University Hospital orgdiv2Department of Clinical Hematology Portugal
                [7] Coimbra orgnameUniversity of Coimbra orgdiv1Faculty of Medicine orgdiv2Institute of Physiology Portugal
                [2] Coimbra orgnameUniversity of Coimbra orgdiv1Faculty of Medicine orgdiv2University Clinic of Surgery Portugal
                [3] Coimbra orgnameUniversity of Coimbra orgdiv1Faculty of Medicine orgdiv2Laboratory of Oncobiology and Hematology. University Clinic of Hematology and Applied Molecular Biology Unit Portugal
                [5] Coimbra orgnameUniversity of Coimbra orgdiv1Faculty of Medicine orgdiv2Center of Investigation in Environment, Genetics and Oncobiology (CIMAGO) Portugal
                [6] Coimbra orgnameUniversity of Coimbra orgdiv1Faculty of Medicine orgdiv2Institute of Biophysics Portugal
                Article
                S0212-16112018000100185 S0212-1611(18)03500100185
                10.20960/nh.1326
                60bff0b4-3338-46bb-8f31-32d35f462e98

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 21 July 2017
                : 03 June 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 27, Pages: 9
                Product

                SciELO Spain

                Categories
                Original Papers

                Factor de crecimiento vascular endotelial,Factor de crecimiento del tejido conectivo,Growth factors,Connective tissue growth factor,Teduglutide,Intestinal anastomosis,Vascular endothelial growth factor,Teduglutida,Factores de crecimiento,Anastomosis intestinal

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