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Málaga-Figueroa L, Alarcón MA, Pannuti CM, Horna P, López-Pacheco A, Gómez M, Jiménez P, Romito GA, Lozano E, Duque A, Montealegre M, Vega MVM, Galindo R, Umanzor V, Zerón A, Barrios C, Shedden M, Castillo R, Collins J, Bueno L, Giménez X, Sanz M, Herrera D. Ibero-Panamerican Federation of Periodontology Delphi study on the trends of periodontology and periodontics by the year 2030. A Latin American consensus. J Periodontal Res 2024; 59:237-248. [PMID: 38135675 DOI: 10.1111/jre.13221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 11/22/2023] [Indexed: 12/24/2023]
Abstract
BACKGROUND AND OBJECTIVE As elsewhere in the world, the prevalence of periodontitis in stages I-II is high in the Latin American population, this scenario emphasizes the need for identification of urgent needs for allocating adequate resources to provide diagnosis, prevention, and treatment of these diseases. The aim of this Delphi study was to predict the trends in periodontology/periodontics in the Latin American region by the year 2030. METHODS A steering committee and an advisory group of experts in periodontology/periodontics were selected from 16 countries. An open questionnaire of 60 questions was validated and used following the Delphi methodology. RESULTS Two hundred and twenty-five experts from Latin America answered the two rounds of the questionnaire. Moderate to strong consensus was reached on 45 questions (75%). The prediction was that the prevalence of gingivitis and periodontitis in stages I and II will be maintained, the importance of the link with systemic diseases will increase, and the impact of prevention and periodontal treatment will also increase, mainly in the private sector. There was a strong consensus that plastic and regenerative surgical procedures will increase, as well as the demand for training in the specialty of periodontology. CONCLUSIONS The present study has provided relevant and useful information on predictions in periodontology/periodontics in Latin America, with important level of consensus among experts. It has been predicted that periodontitis will still be a highly prevalent disease, and its links with other medical conditions should demand more attention by health authorities to develop adequate prevention and management policies and strategies.
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Affiliation(s)
- Lilian Málaga-Figueroa
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Peru
| | - Marco Antonio Alarcón
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Peru
| | - Claudio Mendes Pannuti
- Department of Periodontology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Patricia Horna
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Peru
| | - Andrea López-Pacheco
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Peru
| | - Mariel Gómez
- Faculty of Health Sciences, Department of Periodontics, Maimonides University, Buenos Aires, Argentina
| | | | | | - Elizabeth Lozano
- Private Practice, Chilean Society of Periodontology, Santiago de Chile, Chile
| | - Andrés Duque
- Department of Periodontology, School of Dentistry, Universidad CES, Medellín, Colombia
| | - Mauricio Montealegre
- Private Practice, Perio Costa Rica Institute, Costa Rican Society of Periodontology, San José, Costa Rica
| | | | - Roberto Galindo
- Postgraduate Periodontology and Oral Implantology, Universidad Francisco Marroquín, Ciudad de Guatemala, Guatemala
| | - Vilma Umanzor
- Private Practice, Periodontics and Implant Dentistry, Department of Social/Prevention, School of Dentistry, Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras
| | - Agustín Zerón
- Editor of the Journal of the Mexican Dental Association, Mexico City, Mexico
| | - Carlos Barrios
- Private Practice, Institute of Advance dentistry, Asunción, Paraguay
| | | | - Ruth Castillo
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Peru
| | - James Collins
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra (PUCMM), Santo Domingo, Dominican Republic
| | - Luis Bueno
- Periodontics Department, School of Dentistry, Universidad de la República, Montevideo, Uruguay
| | - Xiomara Giménez
- PerioImplant Research Group UCV, University Central of Venezuelan, Caracas, Venezuela
| | - Mariano Sanz
- ETEP (Etiology and Therapy of Periodontal and Peri-Implant Diseases) Research Group, University Complutense of Madrid, Madrid, Spain
| | - David Herrera
- ETEP (Etiology and Therapy of Periodontal and Peri-Implant Diseases) Research Group, University Complutense of Madrid, Madrid, Spain
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Alkhunaizi M, Patel B, Bueno L, Bhan N, Ahmed T, Arain MH, Saliba R, Rondon G, Dickey BF, Bashoura L, Ost DE, Li L, Wang S, Shpall E, Champlin RE, Mehta R, Popat UR, Hosing C, Alousi AM, Sheshadri A. Risk Factors for Bronchiolitis Obliterans Syndrome after Initial Detection of Pulmonary Impairment after Hematopoietic Cell Transplantation. Transplant Cell Ther 2023; 29:204.e1-204.e7. [PMID: 36503180 PMCID: PMC9992123 DOI: 10.1016/j.jtct.2022.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/30/2022] [Accepted: 12/02/2022] [Indexed: 12/13/2022]
Abstract
Pulmonary chronic graft-versus-host-disease (cGVHD), or bronchiolitis obliterans syndrome (BOS), is a highly morbid complication of hematopoietic cell transplantation (HCT). The clinical significance of a single instance of pulmonary decline not meeting the criteria for BOS is unclear. We conducted a retrospective analysis in a cohort of patients who had an initial post-HCT decline in the absolute value of forced expiratory volume in 1 second (FEV1) of ≥10% or mid-expiratory flow rate of ≥25% but not meeting the criteria for BOS (pre-BOS). We examined the impact of clinical variables in patients with pre-BOS on the risk for subsequent BOS. Pre-BOS developed in 1325 of 3170 patients (42%), of whom 72 (5%) later developed BOS. Eighty-four patients developed BOS without detection of pre-BOS by routine screening. Among patients with pre-BOS, after adjusting for other significant variables, airflow obstruction (hazard ratio [HR], 2.0; 95% confidence interval [CI], 1.1 to 3.7; P = .02), percent-predicted FEV1 on decline (HR, .98; 95% CI, .97 to 1.0; P = .02), active cGVHD (HR, 7.7; 95% CI, 3.1 to 19.3; P < .001), peripheral blood stem cell source (HR, 3.8; 95% CI, 1.7 to 8.6; P = .001), and myeloablative conditioning (HR, 2.0; 95% CI, 1.1 to 3.5; P = .02) were associated with subsequent BOS. The absence of airflow obstruction and cGVHD had a negative predictive value of 100% at 6 months for subsequent BOS, but the positive predictive value of both factors was low (cGVHD, 3%; any obstruction, 4%; combined, 6%). Several clinical factors at the time of pre-BOS, particularly active cGVHD and airflow obstruction, increase the risk for subsequent BOS. These factors merit consideration to be included in screening practices to improve the detection of BOS, with the caveat that the predictive utility of these factors is limited by the overall low incidence of BOS among patients with pre-BOS.
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Affiliation(s)
| | - Badar Patel
- Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Luis Bueno
- Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Monterrey, Mexico
| | - Neel Bhan
- Department of Medicine, Baylor College of Medicine, Houston, Texas
| | - Tahreem Ahmed
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Muhammad H Arain
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Rima Saliba
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Gabriela Rondon
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Burton F Dickey
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lara Bashoura
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David E Ost
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Liang Li
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Shikun Wang
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Elizabeth Shpall
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Richard E Champlin
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Rohtesh Mehta
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Uday R Popat
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Chitra Hosing
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Amin M Alousi
- Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Ajay Sheshadri
- Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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Ascasíbar E, Lapayese F, Soleto A, Jiménez-Denche A, Cappa Á, Pons-Villalonga P, Portas AB, Martín G, Barcala JM, García-Gómez R, Chamorro M, Cebrián L, Antón R, Bueno L, Reynoso C, Guisse V, López-Fraguas A. Measurements of magnetic field fluctuations in TJ-II plasmas with new in-vessel helical arrays of magnetic coils. Rev Sci Instrum 2022; 93:093508. [PMID: 36182487 DOI: 10.1063/5.0102037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 07/29/2022] [Indexed: 06/16/2023]
Abstract
This paper describes two new helical arrays of magnetic coils recently installed inside the TJ-II vacuum vessel. Their main objective is the precise measurement of the spatial periodicity of the magnetohydrodynamic perturbations usually found in the TJ-II plasmas. Given the high probability of coil failures due to the harsh plasma environment and in view of the extremely difficult access to the TJ-II vessel interior for maintenance, the coil system has been divided in two quasi-identical helical arrays. Both arrays consist of 32 triaxial sensors measuring orthogonal components of the local magnetic field along an ideal helical path whose trajectory runs close to the plasma edge. A description of the main characteristics of coils and arrays as well as their nominal positioning along an ideal helical path, inside the vessel, is given. A precise experimental determination of the real spatial orientation of the coils is performed by comparing the signals measured in current ramp-up and ramp-down experiments with calculations based on a filamentary model for the TJ-II magnetic coils. After this fine calibration procedure, it is possible to analyze the dependence of the amplitude of the measured magnetic field and its fluctuations as a function of the coil distance to the last closed flux surface. The study of the phase evolution of the parallel and perpendicular oscillatory components is also enabled. Finally, two examples of mode number determination are shown. One corresponds to a low frequency mode appearing in pure electron cyclotron resonance heating plasma, and the other one shows several modes observed during combined injection of both co and counter neutral beams and identified as shear Alfvén waves.
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Affiliation(s)
- E Ascasíbar
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - F Lapayese
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - A Soleto
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | | | - Á Cappa
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | | | - A B Portas
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - G Martín
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - J M Barcala
- Departamento de Tecnología, CIEMAT, 28040 Madrid, Spain
| | - R García-Gómez
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - M Chamorro
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - L Cebrián
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - R Antón
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - L Bueno
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - C Reynoso
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
| | - V Guisse
- Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain
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Alarcón MA, Sanz-Sánchez I, López-Pacheco A, Tavelli L, Galarraga-Vinueza ME, Schwarz F, Romanelli H, Peredo L, Pannuti CM, Javer E, Vieira AF, Montealegre M, Galindo R, Umanzor V, Treviño A, Fretes-Wood P, Cisneros M, Collins JR, Bueno L, Gimenéz X, Málaga-Figueroa L, Sanz M. Ibero-Panamerican Federation of Periodontics Delphi study on the trends in diagnosis and treatment of peri-implant diseases and conditions: A Latin American consensus. J Periodontol 2021; 92:1697-1718. [PMID: 33851728 DOI: 10.1002/jper.21-0086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/26/2021] [Accepted: 04/05/2021] [Indexed: 01/07/2023]
Abstract
BACKGROUND The social diversity, heterogeneous culture, and inherent economic inequality factors in Latin America (LA) justify conducting a comprehensive analysis on the current status and future trends of peri-implant diseases and conditions. Thus, the aim of this Delphi study was to predict the future trends in the diagnosis and treatment of peri-implant diseases and conditions in LA countries for the year 2030. METHODS A Latin American steering committee and group of experts in implant dentistry validated a questionnaire including 64 questions divided into eight sections. The questionnaire was run twice with an interval of 45 days, with the results from the first round made available to all the participants in the second round. The results were expressed in percentages and data was analyzed describing the consensus level reached in each question. RESULTS A total of 221 experts were invited to participate in the study and a total 214 (96.8%) completed the two rounds. Moderate (65%-85%) to high consensus (≥ 85%) was reached in 51 questions (79.69%), except in the questions dealing with "prevalence", where no consensus was reached. High and moderate consensus was attained for all the questions in three fields (risk factors and indicators, diagnosis and treatment of peri-implant conditions and deficiencies, and prevention and maintenance). CONCLUSIONS The present study has provided relevant and useful information on the predictions in the diagnosis and treatment of peri-implant diseases with a high level of consensus among experts. Nevertheless, there is still a lack of agreement in certain domains.
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Affiliation(s)
- Marco Antonio Alarcón
- Academic Department of Clinical Stomatology, PerioImplant Research Group UPCH, Cayetano Heredia Peruvian University, Lima, Perú
| | - Ignacio Sanz-Sánchez
- ETEP (Etiology and Therapy of Periodontal and Peri-Implant Diseases) Research Group, University Complutense, Madrid, Spain
| | - Andrea López-Pacheco
- Academic Department of Clinical Stomatology, PerioImplant Research Group UPCH, Cayetano Heredia Peruvian University, Lima, Perú
| | - Lorenzo Tavelli
- Department of Periodontics & Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | | | - Frank Schwarz
- Department of Oral Surgery and Implantology, Carolinum, Johann Wolfgang Goethe-University Frankfurt, Frankfurt am Main, Germany
| | - Hugo Romanelli
- Department of Periodontics, Faculty of Health Sciences, Maimónides University, Buenos Aires, Argentina
| | | | - Claudio Mendes Pannuti
- Department of Periodontology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
| | - Enrique Javer
- Conservative Dentistry Department, Chair of Periodontology, Faculty of Dentistry, University of Chile, Santiago, Chile
| | - Andrés Felipe Vieira
- Assistant Professor of Periodontology Posgraduate Program, Pontificia Universidad Javeriana, Bogota, Colombia
| | | | - Roberto Galindo
- Posgraduate Periodontology and Oral Implantology, Universidad Francisco Marroquín, Ciudad de Guatemala, Guatemala
| | - Vilma Umanzor
- Private Practice, Periodontics and Implant Dentistry, Department of Social/Prevention, School of Dentistry, Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras
| | - Alejandro Treviño
- Postgraduate Studies and Research Division, Faculty of Dentistry, National Autonomous University of Mexico, UNAM, Mexico City, Mexico
| | | | - Marissa Cisneros
- Department of Periodontology, School of Dentistry, Universidad Interamericana de Panama, Panama City, Panama
| | - James R Collins
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra (PUCMM), Santo Domingo, Dominican Republic
| | - Luis Bueno
- Periodontics Department, School of Dentistry, Universidad de la República, Montevideo, Uruguay
| | - Xiomara Gimenéz
- PerioImplant Research Group UCV, University Central of Venezuelan, Caracas, Venezuela
| | - Lilian Málaga-Figueroa
- Academic Department of Clinical Stomatology, PerioImplant Research Group UPCH, Cayetano Heredia Peruvian University, Lima, Perú
| | - Mariano Sanz
- ETEP (Etiology and Therapy of Periodontal and Peri-Implant Diseases) Research Group, University Complutense, Madrid, Spain
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Meleti M, Cassi D, Bueno L, Bologna‐Molina R. COVID-19 diffusion and its impact on dental practice in distant countries with similar ethnic background. Oral Dis 2021; 27 Suppl 3:720-722. [PMID: 32452587 PMCID: PMC7283863 DOI: 10.1111/odi.13438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 05/13/2020] [Accepted: 05/14/2020] [Indexed: 02/05/2023]
Affiliation(s)
- Marco Meleti
- Department of Medicine and SurgeryCentro Universitario di OdontoiatriaUniversity of ParmaParmaItaly
| | - Diana Cassi
- Dentistry and Oral and Maxillofacial SurgeryDepartment of Surgical, Medical, Dental and Morphological Science with interest in Transplant Oncological and Regenerative MedicineUniversity of Modena and Reggio EmiliaModenaItaly
| | - Luis Bueno
- Periodontics DepartmentSchool of DentistryUniversidad de la RepúblicaMontevideoUruguay
| | - Ronell Bologna‐Molina
- Molecular Pathology AreaSchool of DentistryUniversidad de la RepúblicaMontevideoUruguay
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Alarcón MA, Sanz-Sánchez I, Shibli JA, Treviño Santos A, Caram S, Lanis A, Jiménez P, Dueñas R, Torres R, Alvarado J, Avendaño A, Galindo R, Umanzor V, Shedden M, Invernizzi C, Yibrin C, Collins J, León R, Contreras L, Bueno L, López-Pacheco A, Málaga-Figueroa L, Sanz M. Delphi Project on the trends in Implant Dentistry in the COVID-19 era: Perspectives from Latin America. Clin Oral Implants Res 2021; 32:521-537. [PMID: 33595844 PMCID: PMC8014337 DOI: 10.1111/clr.13723] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 01/13/2021] [Accepted: 02/08/2021] [Indexed: 02/07/2023]
Abstract
AIM To establish trends in Implant Dentistry in Latin America in the COVID-19 pandemic. MATERIAL AND METHODS A steering committee and an advisory group of experts in Implant Dentistry were selected among eighteen countries. An open-ended questionnaire by Delphi methodology was validated including 64 questions, divided in 7 topics, concerning the various trends in dental implantology. The survey was conducted in two rounds, which provided the participants in the second round with the results of the first. The questionnaires were completed on August 2020, and the online meeting conference was held on September 2020. The final prediction was developed through consensus by a selected group of experts. RESULTS A total of 197 experts from Latin America answered the first and second questionnaire. In the first round, the established threshold for consensus (65%) was achieved in 30 questions (46.87%). In the second round, performed on average 45 days later, this level was achieved in 47 questions (73.43%). Consensus was completely reached on the item "Diagnostic" (100%), the field with the lowest consensus was "Demand for treatment with dental implants" (37.5%). CONCLUSIONS The present study in Latin America has provided relevant and useful information on the predictions in the education and practice of Implant Dentistry in the COVID-19 era. The consensus points toward a great confidence of clinicians in the biosecurity protocols used to minimize the risk of SARS-CoV-2 transmission. It is foreseen as an important change in education, with introduction of virtual reality and other simulation technologies in implant training.
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Affiliation(s)
- Marco Antonio Alarcón
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Perú
| | - Ignacio Sanz-Sánchez
- ETEP (Etiology and Therapy of Periodontal and Peri-Implant Diseases) Research Group, University Complutense, Madrid, Spain
| | - Jamil Awad Shibli
- Department of Periodontology and Oral Implantology, Dental Research Division, Guaruhos University, Guarulhos, SP, Brazil
| | - Alejandro Treviño Santos
- Postgraduate Studies and Research Division, Faculty of Dentistry, National Autonomous University of Mexico, UNAM, Mexico City, Mexico
| | | | - Alejandro Lanis
- Private Practice, Santiago, Chile.,Department of Prosthodontics, Indiana University School of Dentistry, Indianapolis, IN, USA
| | | | - Ricardo Dueñas
- Centro de Investigaciones Odontológicas, School of Dentistry, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Ronald Torres
- Department of Diagnostic and Surgical Sciences, Faculty of Dentistry, University of Costa Rica, San José, Costa Rica
| | - Jacinto Alvarado
- Research Group GIRO, Department of Periodontology, University of Cuenca, Cuenca, Ecuador
| | | | - Roberto Galindo
- Posgraduate Periodontology and Oral Implantology, Universidad Francisco Marroquín, Ciudad de Guatemala, Guatemala
| | - Vilma Umanzor
- Periodontics and Implant Dentistry, Department of Social/Prevention, School of Dentistry, Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras
| | | | - Carlos Invernizzi
- Department of Research in Dentistry, Autonomous University of Asunción, Asunción, Paraguay
| | - Caroll Yibrin
- Universidad Central de Venezuela, Caracas, Venezuela
| | - James Collins
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra, Santo Domingo, Dominican Republic
| | - Roberto León
- Public Health and Dentistry Services Management Research Unit, Cayetano Heredia Peruvian University, Lima, Perú
| | | | - Luis Bueno
- Periodontics Department, School of Dentistry, Universidad de la República, Montevideo, Uruguay
| | - Andrea López-Pacheco
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Section of Oral Implantology, Cayetano Heredia Peruvian University, Lima, Perú
| | - Lilian Málaga-Figueroa
- PerioImplant Research Group UPCH, Academic Department of Clinical Stomatology, Cayetano Heredia Peruvian University, Lima, Perú
| | - Mariano Sanz
- ETEP (Etiology and Therapy of Periodontal and Peri-Implant Diseases) Research Group, University Complutense, Madrid, Spain
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Bueno L, Laso C, Amador C, Bakalis S. Modelling the kinetics of stain removal from knitted cotton fabrics in a commercial Front Loader Washing Machine (FLWM). Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.02.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Badanian A, Bueno L, Papone V. Análisis bacteriano comparativo de cuadros de Periodontitis Crónica y Agresiva en una población muestra de Uruguay. Odontoestomatología 2019. [DOI: 10.22592/ode2019n33a2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Badanian A, Ponce de León E, Rodríguez L, Bascuas T, Capó C, Batlle A, Bueno L, Papone V. Detección de patógenos periodontales de una población con Periodontitis Agresiva en Uruguay mediante metodología convencional y molecular. Odontoestomatología 2018. [DOI: 10.22592/ode2018n32a9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Andrade E, Lorenzo S, Álvarez L, Fabruccini A, García MV, Mayol M, Drescher A, Asquino N, Bueno L, Rösing CK. Epidemiología de las Enfermedades Periodontales en el Uruguay. Pasado y presente. Odontoestomatología 2017. [DOI: 10.22592/ode2017n30a3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Morales A, Carvajal P, Romanelli H, Gómez M, Loha C, Esper ME, Musso G, Ardila CM, Duque A, Medina M, Bueno L, Andrade E, Mendoza C, Gamonal J. Prevalence and predictors for clinical attachment loss in adolescents in Latin America: cross-sectional study. J Clin Periodontol 2015; 42:900-7. [DOI: 10.1111/jcpe.12452] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/01/2015] [Indexed: 12/15/2022]
Affiliation(s)
- Alicia Morales
- Laboratory of Periodontal Biology; Department of Conservative Dentistry; Faculty of Dentistry; Universidad de Chile; Santiago Chile
| | - Paola Carvajal
- Laboratory of Periodontal Biology; Department of Conservative Dentistry; Faculty of Dentistry; Universidad de Chile; Santiago Chile
| | - Hugo Romanelli
- School of Dentistry; Universidad de Maimónides; Buenos Aires Argentina
| | - Mariel Gómez
- School of Dentistry; Universidad de Maimónides; Buenos Aires Argentina
| | - Cristina Loha
- Faculty of Dentistry; Universidad Nacional de Cuyo; Mendoza Argentina
| | - María E. Esper
- Faculty of Dentistry; Universidad Nacional de Córdoba; Córdoba Argentina
| | - Graciela Musso
- Faculty of Dentistry; Universidad Nacional de Córdoba; Córdoba Argentina
| | - Carlos M. Ardila
- Department of Periodontology; School of Dentistry; Universidad de Antioquia; Medellín Colombia
| | - Andrés Duque
- Department of Periodontology; School of Dentistry; Universidad CES; Medellín Colombia
| | - Marco Medina
- Faculty of Dentistry; Universidad Central del Ecuador; Quito Ecuador
| | - Luis Bueno
- Department of Periodontology; Universidad de la República; Montevideo Uruguay
| | - Ernesto Andrade
- Department of Periodontology; Universidad de la República; Montevideo Uruguay
| | - Carolina Mendoza
- Oral Health Department, DIPRECE; Ministerio de Salud Santiago Chile
| | - Jorge Gamonal
- Laboratory of Periodontal Biology; Department of Conservative Dentistry; Faculty of Dentistry; Universidad de Chile; Santiago Chile
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Lourenço M, Bueno L, Baccaro V, Batista B, Kanashiro M, Anjos C, Braga D. Electromyographic analysis of tibialis anterior and soleus muscles in hemiparetic patients on aquatic environment in comparison to land environment. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Gilet M, Eutamene H, Han H, Kim HW, Bueno L. Influence of a new 5-HT4 receptor partial agonist, YKP10811, on visceral hypersensitivity in rats triggered by stress and inflammation. Neurogastroenterol Motil 2014; 26:1761-70. [PMID: 25316608 DOI: 10.1111/nmo.12458] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 09/18/2014] [Indexed: 02/08/2023]
Abstract
BACKGROUND Adverse effects of previously developed 5-HT4 receptor agonists to treat functional constipation (FC) and constipation IBS (IBS-C) patients have limited their use but have given rise to new and more selective 5-HT4 receptor agonists. This work was aimed to evaluate the influence of YKP10811, a new potent 5-HT4 receptor partial agonist, on rat models of colorectal hypersensitivity to distension. METHODS Male and female rats were submitted to colorectal distension (CRD) before and after trinitrobenzene sulfonic acid (TNBS) infusion, acute (PRS) or chronic (water avoidance -10 days - WAS) stress. Electromyographic (EMG) response of abdominal muscles to CRD (15-60 mmHg) was used to measure pain. Changes of colonic tone were also evaluated. The influence of YKP10811 was compared to that of tegaserod with or without exposure of rats to a 5-HT4 receptor antagonist in TNBS treated rats and to both tegaserod and CP-154,526, a corticotropine releasing factor-R1 antagonist in WAS. We tested a possible pharmacological tachyphylaxis of YKP10811 in TNBS-induced hypersensitivity. KEY RESULTS YKP10811 (30 mg/kg) had no effect on basal sensitivity and tone in male and female rats but suppressed TNBS-induced hypersensitivity, an effect blocked by the 5-HT4 receptor antagonist GR113808 (10 mg/kg, SC). YKP10811 attenuated acute PRS-induced but not chronic WAS-induced colonic hypersensitivity. In addition, YKP10811 but not tegaserod reduced TNBS-induced colorectal hypersensitivity after 7 days of treatment. CONCLUSIONS & INFERENCES YKP10811exhibits antinociceptive activity in inflammation and acute stress-induced colonic hypersensitivity through 5-HT4 receptors but unlike tegaserod, YKP10811 maintains its activity after repeated administrations and may represent a new candidate to treat IBS-C patients.
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Affiliation(s)
- M Gilet
- Neurogastroenterology Unit INRA-Toxalim, Toulouse, France
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Bueno L. Protection of epithelial tight junction: a new therapeutic approach in the treatment of infectious diarrhea. Acta Gastroenterol Belg 2014; 77:366-367. [PMID: 25509214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Cantisán S, Lara R, Montejo M, Redel J, Rodríguez-Benot A, Gutiérrez-Aroca J, González-Padilla M, Bueno L, Rivero A, Solana R, Torre-Cisneros J. Pretransplant interferon-γ secretion by CMV-specific CD8+ T cells informs the risk of CMV replication after transplantation. Am J Transplant 2013; 13:738-45. [PMID: 23311355 DOI: 10.1111/ajt.12049] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 10/30/2012] [Accepted: 11/02/2012] [Indexed: 01/25/2023]
Abstract
In this prospective study we analyzed pretransplant interferon-γ secretion by cytomegalovirus (CMV)-specific CD8+ T cells to assess its possible utility in determining the risk of CMV replication after solid organ transplantation. A total of 113 lung and kidney transplant patients were enrolled in the study but only 55 were evaluable. All CMV-seronegative recipients were pretransplant "nonreactive" (IFNγ <0.2 IU/mL) (11/11), whereas 30/44 (68.2%) CMV-seropositive (R+) recipients were "reactive" (IFNγ ≥0.2 IU/mL) and 14/44 (31.8%) were "nonreactive". In the R(+) "nonreactive" group, 7/14 (50%) developed posttransplant CMV replication, whereas the virus replicated only in 4/30 (13.3%) of the R(+) "reactive" patients (p = 0.021). According to the best multivariate model, pretransplant "nonreactive" recipients receiving an organ from a CMV-seropositive donor had a 10-fold increased risk of CMV replication compared to pretransplant "reactive" recipients (adjusted OR 10.49, 95% CI 1.88-58.46). This model displayed good discrimination ability (AUC 0.80) and calibration (Hosmer-Lemeshow test, p = 0.92). Negative and positive predictive values were 83.7% and 75%, respectively. The accuracy of the model was 82%. Therefore, assessment of interferon-γ secretion by cytomegalovirus (CMV)-specific CD8+ T cells prior to transplantation is useful in informing the risk of posttransplant CMV replication in solid organ transplant patients.
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Affiliation(s)
- S Cantisán
- Instituto Maimónides de Investigación Biomédica de Córdoba-Reina Sofia University Hospital-University of Cordoba, Cordoba, Spain.
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Monetta P, Bueno L, Cornejo V, González-Aubone F, Babelis G. Short-term dynamics of soil chemical parameters after application ofalperujoin high-density drip-irrigated olive groves in Argentina. ACTA ACUST UNITED AC 2012. [DOI: 10.1080/00207233.2012.693290] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Annaházi A, Dabek M, Gecse K, Salvador-Cartier C, Polizzi A, Rosztóczy A, Róka R, Theodorou V, Wittmann T, Bueno L, Eutamene H. Proteinase-activated receptor-4 evoked colorectal analgesia in mice: an endogenously activated feed-back loop in visceral inflammatory pain. Neurogastroenterol Motil 2012; 24:76-85, e13. [PMID: 22044612 DOI: 10.1111/j.1365-2982.2011.01805.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Activation of proteinase-activated receptor-4 (PAR-4) from the colonic lumen has an antinociceptive effect to colorectal distension (CRD) in mice in basal conditions. We aimed to determine the functional localization of the responsible receptors and to test their role in two different hyperalgesia models. METHODS Mice received PAR-4 activating peptide (PAR-4-AP, AYPGKF-NH(2)) or vehicle intraperitoneally (IP), and abdominal EMG response to CRD was measured. The next group received PAR-4-AP intracolonically (IC) with or without 2,4,6-triaminopyrimidine, a chemical tight junction blocker, before CRD. The SCID mice were used to test the role of lymphocytes in the antihyperalgesic effect. The effects of PAR-4-AP and PAR-4-antagonist (P4pal-10) were evaluated in water avoidance stress (WAS) model and low grade 2,4,6-trinitrobenzene sulfonic acid (TNBS) colitis. Spinal Fos protein expression was visualized by immunohistochemistry. KEY RESULTS The antinociceptive effect of PAR-4-AP disappeared when was administrered IP, or with the blockade of colonic epithelial tight junctions, suggesting that PAR-4-AP needs to reach directly the nerve terminals in the colon. The CRD-induced spinal Fos overexpression was reduced by 43% by PAR-4-AP. The PAR-4-AP was antihyperalgesic in both hyperalgesia models and in mice with impaired lymphocytes. The PAR-4-antagonist significantly increased the TNBS, but not the WAS-induced colonic hyperalgesia. CONCLUSIONS & INFERENCES The antinociceptive effect of PAR-4-AP depends on its penetration to the colonic mucosa. The PAR-4 activation is endogenously involved as a feedback loop to attenuate inflammatory colonic hyperalgesia to CRD.
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Affiliation(s)
- A Annaházi
- Toxalim UMR 1331 INRA/INP/UPS Neuro-Gastroenterology & Nutrition Unit, Toulouse, France
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Wittmann T, Paradovsky L, Ducrotte P, Bueno L, Andro-Delestrain MCT. [Efficacy of alverina citrate and simethicone combination in abdominal pain and discomfort of irritable bowel syndrome]. Eksp Klin Gastroenterol 2011:60-67. [PMID: 21698811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
UNLABELLED The alverina citrate and simethicone combination (ACS-Meteospazmil) is used for irritable bowel syndrome (IBS) for almost 20 years, but the supporting scientific evidence for efficacy is limited. OBJECTIVE to evaluate the effectiveness of ACS in patients with abdominal pain and discomfort at IBS. METHODS In a double-blind, randomized, placebo-controlled study enrolled 412 patients with IBS conform to Rome criteria III. Selection criterion in the study was to evaluate the intensity of abdominal pain or discomfort during the 2-week run-in period without medication, which according to analog scale (VAS) was to be 60-100 mm. With the help of an interactive voice communication system (IVCS), patients were randomized to treatment with either alverin citrate 60 mg with Simethicone 300 mg three times daily or corresponding placebo for 4 weeks. RESULTS For analyze of the results of the study were selected 409 patients. After 4 weeks, patients treated with ACS, was observed lower scores in the VAS assessment of abdominal pain or discomfort compared to placebo (mean--40 and 50 mm, p = 0.047) and a higher level of response to treatment (46.8% and 34.3%, respectively). Recorded side effects were similar in both groups. CONCLUSION The combination of ACS was significantly more effective in patients with IBS compared to placebo in reducing abdominal pain or discomfort.
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Wittmann T, Paradowski L, Ducrotté P, Bueno L, Andro Delestrain MC. Clinical trial: the efficacy of alverine citrate/simeticone combination on abdominal pain/discomfort in irritable bowel syndrome--a randomized, double-blind, placebo-controlled study. Aliment Pharmacol Ther 2010; 31:615-24. [PMID: 20003095 DOI: 10.1111/j.1365-2036.2009.04216.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Alverine citrate and simeticone combination has been used for almost 20 years in irritable bowel syndrome (IBS), but supportive scientific evidence of efficacy was limited. AIM To evaluate the efficacy of alverine citrate and simeticone combination in patients with IBS-related abdominal pain/discomfort. METHODS A total of 412 IBS patients meeting ROME III criteria were included in this double-blind randomized placebo-controlled study if their abdominal pain/discomfort intensity was at least 60 mm on a 0-100 mm visual analogue scale (VAS) during a 2-week run-in treatment-free period. Patients were randomly assigned through the use of Interactive Voice Response System to receive either alverine citrate 60 mg with simeticone 300 mg three times daily or matching placebo for 4 weeks. RESULTS The full analysis set included 409 patients (71.4% female: mean age: 46.2 +/- 13.9 years). At week 4, alverine citrate and simeticone group had lower VAS scores of abdominal pain/discomfort (median: 40 mm vs. 50 mm, P = 0.047) and higher responder rate (46.8% vs. 34.3%, OR = 1.3; P = 0.01) as compared with placebo group. Patient receiving alverine citrate and simeticone reported greater global symptom improvement compared with those receiving placebo (P = 0.0001). Reported adverse events were similar in both groups. CONCLUSION Alverine citrate/simeticone combination was significantly more effective than placebo in relieving abdominal pain/discomfort in patients with IBS.
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Affiliation(s)
- T Wittmann
- First Department of Medicine, University of Szeged, Szeged, Hungary.
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Eutamene H, Bradesi S, Larauche M, Theodorou V, Beaufrand C, Ohning G, Fioramonti J, Cohen M, Bryant AP, Kurtz C, Currie MG, Mayer EA, Bueno L. Guanylate cyclase C-mediated antinociceptive effects of linaclotide in rodent models of visceral pain. Neurogastroenterol Motil 2010; 22:312-e84. [PMID: 19706070 DOI: 10.1111/j.1365-2982.2009.01385.x] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Linaclotide is a novel, orally administered investigational drug currently in clinical development for the treatment of constipation-predominant irritable bowel syndrome (IBS-C) and chronic idiopathic constipation. Visceral hyperalgesia is a major pathophysiological mechanism in IBS-C. Therefore, we investigated the anti-nociceptive properties of linaclotide in rodent models of inflammatory and non-inflammatory visceral pain and determined whether these pharmacological effects are linked to the activation of guanylate cyclase C (GC-C). METHODS Orally administered linaclotide was evaluated in non-inflammatory acute partial restraint stress (PRS) and acute water avoidance stress (WAS) models in Wistar rats, and in a trinitrobenzene sulfonic acid (TNBS)-induced inflammatory model in Wistar rats and GC-C null mice. KEY RESULTS In TNBS-induced colonic allodynia, linaclotide significantly decreased the number of abdominal contractions in response to colorectal distension without affecting the colonic wall elasticity change in response to distending pressures after TNBS. However, linaclotide had no effect on visceral sensitivity under basal conditions. In addition, linaclotide significantly decreased colonic hypersensitivity in the PRS and WAS models. In wild type (wt) and GC-C null mice, the instillation of TNBS induced similar hyperalgesia and allodynia. However, in post-inflammatory conditions linaclotide significantly reduced hypersensitivity only in wt mice, but not in GC-C null mice. CONCLUSIONS & INFERENCES These findings indicate that linaclotide has potent anti-nociceptive effects in several mechanistically different rodent models of visceral hypersensitivity and that these pharmacological properties of linaclotide are exerted through the activation of the GC-C receptor. Therefore, linaclotide may be capable of decreasing abdominal pain in patients suffering from IBS-C.
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Affiliation(s)
- H Eutamene
- UMR INRA-Purpan Neuro-Gastroenterology and Nutrition Unit, Toulouse, France
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Bueno L. [Therapeutic targets]. ACTA ACUST UNITED AC 2009; 33 Suppl 1:S59-67. [PMID: 19303540 DOI: 10.1016/s0399-8320(09)71526-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Based on better recent knowledge of the factors involved in triggering visceral hyperalgesia, the therapeutic approach to irritable bowel syndrome (IBS) treatment is changing. The classical approach targeting first bowel movement alterations or motility disorders using spasmolytic agents has to be replaced by visceral antinociceptive drugs. Several mediators and receptors involved in gut hyperalgesia have already been identified. Serotonin (5-HT), tachykinins, CCK, NGF, and other mediators are involved in experimental models of gut hyperalgesia, and related receptor antagonists have already been introduced in clinical trials. However, IBS is associated with mucosal immune stimulation, considered a microinflammatory state associated with increased density of immunocytes and mast cells, offering new targets. Altered mucosal barrier permeability with increased entry of toxins and bacteria is considered to be responsible for the mucosal microinflammation. Endogenous but predominantly luminal factors have been identified as factors responsible for such altered permeability. These clinical data have opened the door to promising future drugs able to prevent or blunt such permeability alteration, which therefore may constitute a pathophysiological treatment for IBS.
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Affiliation(s)
- L Bueno
- Unité de Neurogastroenterologie et Nutrition, 180 Chemin de Tournefeuille-BP3, 31931 Toulouse, France.
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Ait-Belgnaoui A, Eutamene H, Houdeau E, Bueno L, Fioramonti J, Theodorou V. Lactobacillus farciminis treatment attenuates stress-induced overexpression of Fos protein in spinal and supraspinal sites after colorectal distension in rats. Neurogastroenterol Motil 2009; 21:567-73, e18-9. [PMID: 19309441 DOI: 10.1111/j.1365-2982.2009.01280.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Abstract Irritable bowel syndrome (IBS), frequently associated with psychological distress, is characterized by hypersensitivity to gut wall distension. Some probiotics are able to alleviate IBS symptoms and reduce visceromotor response to mechanical stimuli in animals. Moreover, we have previously shown that Lactobacillus farciminis treatment abolished the hyperalgesia to colorectal distension (CRD) induced by acute stress. The aims of the present study were to determine whether (i) stress-induced visceral hyperalgesia modifies the expression of Fos, a marker of general neuronal activation, induced by CRD, (ii) this activation can be modulated by L. farciminis treatment. Female rats were treated by L. farciminis and CRD was performed after partial restraint stress (PRS) or sham-PRS. The expression of Fos protein was measured by immunohistochemistry. After CRD or PRS, Fos expression was increased in spinal cord section (S1), nucleus tractus solitarius (NTS), paraventricular nucleus (PVN) of the hypothalamus, and in the medial nucleus of the amygdala (MeA). The combination of both stimuli, PRS and CRD, markedly increased this Fos overexpression in the sacral spinal cord section, PVN and MeA, but not in NTS. By contrast, a pretreatment with L. farciminis significantly reduced the number of Fos positive cells in these area. This study shows that PRS enhances Fos protein expression induced by CRD at the spinal and supraspinal levels in rats. Lactobacillus farciminis treatment inhibited this enhancing effect, suggesting that the antinociceptive effect of this probiotic strain results from a decrease of the stress-induced activation/sensitization of sensory neurons at the spinal and supraspinal level.
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Affiliation(s)
- A Ait-Belgnaoui
- Neuro-Gastroenterology and Nutrition Unit, UMR INRA/EI-Purpan, Toulouse, France
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Affiliation(s)
- R Róka
- First Department of Internal Medicine, University of Szeged, Szeged, Hungary.
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Bueno L. Protease activated receptor 2: a new target for IBS treatment. Eur Rev Med Pharmacol Sci 2008; 12 Suppl 1:95-102. [PMID: 18924448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Proteinase-activated receptors (PARs) are G-protein-coupled receptors that are activated by the proteolytic cleavage of their N-terminal domain. The new N-terminal sequence that is exposed by proteolysis acts as a tethered ligand, which binds to and activates the receptor. PAR-2 is highly expressed in the gastrointestinal tract, where it is found in endothelial cells, colonic myocytes, enterocytes (both on basolateral and apical membranes), enteric neurons, terminals of mesenteric afferent nerves and immune cells. In the gastrointestinal tract, PAR-2 may be activated by tryptase from mast cells but also by luminal proteases such as trypsin and possibly bacterial proteases. In addition to effects on motility, ion and mucus secretion, activation of PAR-2 receptors from luminal affects visceral pain. In rats, the intracolonic infusion of PAR-2 agonists (SLIGRL, trypsin) initiates a delayed hypersensitivity to colonic distension. These effects are locally mediated since they are not observed for systemic administration. Interestingly, such pronociceptive effect of local activation of PAR-2 is associated with increased colonic paracellular permeability. Blockade of such increase in permeability, prevents the occurrence of hypersensitivity to rectal distension suggesting that activation of the local immune system by luminal toxins and antigens is responsible for the sensitization of primary afferent terminals to mechanical stimuli. Consequently, blockade of PAR-2 receptors at the periphery and/or inhibition of colonic luminal protease activity may be new interesting targets for the treatment of gut hypersensitivity and IBS. A recent study has evidenced that stool supernatants from diarrhea predominant IBS patients have a high level of serine-protease activity that increases permeability and colonic hypersensitivity when infused intra-colonically in mice, and these effects are linked to activation of PAR-2 receptors. These data support a possible role of luminal proteases in the pathogenesis of IBS and give a rationale to target PARs and more specifically PAR-2 as future treatment of IBS.
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Affiliation(s)
- L Bueno
- Neurogastroenterology Unit, INRA, Toulouse, France.
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Abstract
Digestive tract proteases are best known for their proteolytic activity in the digestion of alimentary proteins. However, during the last decade, a possible role of proteases as signalling molecules has been emphasized with the discovery of a novel class of G-protein coupled receptors located on cell membranes that may be activated by proteolytic cleavage of their N-terminal extracellular domain. Type 2 protease-activated receptors (PAR-2) are cleaved by serine-proteases such as trypsin and tryptase. PAR-2 is present in many intestinal cell types and particularly on epithelial cells. Multiple functions have been demonstrated in the gut for PAR-2, including epithelial permeability, mainly the intercellular permeability that is of paramount importance in the equilibrium between the external milieu (digestive contents) and the submucosal immune system. Alterations of both tissue and luminal levels of proteases or serine-protease activity may affect gut permeability and subsequently the immune status of the mucosa. Activation of PAR-2 on epithelial cells may directly affect cytoskeleton contraction by triggering phosphorylation of myosin light chain with subsequent changes in tight junction permeability. Enhanced fecal protease level has been recently reported in both organic (ulcerative colitis) and functional (irritable bowel syndrome) intestinal disorders and may play a role in the pathogenesis of such diseases.
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Affiliation(s)
- L Bueno
- Neurogastroenterology and Nutrition Unit, INRA, Toulouse, France.
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Gecse K, Róka R, Ferrier L, Leveque M, Eutamene H, Cartier C, Ait-Belgnaoui A, Rosztóczy A, Izbéki F, Fioramonti J, Wittmann T, Bueno L. Increased faecal serine protease activity in diarrhoeic IBS patients: a colonic lumenal factor impairing colonic permeability and sensitivity. Gut 2008; 57:591-9. [PMID: 18194983 DOI: 10.1136/gut.2007.140210] [Citation(s) in RCA: 221] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES Diarrhoea-predominant irritable bowel syndrome (IBS-D) is characterised by elevated colonic lumenal serine protease activity. The aims of this study were (1) to investigate the origin of this elevated serine protease activity, (2) to evaluate if it may be sufficient to trigger alterations in colonic paracellular permeability (CPP) and sensitivity, and (3) to examine the role of the proteinase-activated receptor-2 (PAR-2) activation and signalling cascade in this process. PATIENTS AND METHODS Faecal enzymatic activities were assayed in healthy subjects and patients with IBS, ulcerative colitis and acute infectious diarrhoea. Following mucosal exposure to supernatants from control subjects and IBS-D patients, electromyographic response to colorectal balloon distension was recorded in wild-type and PAR-2(-/-) mice, and CPP was evaluated on colonic strips in Ussing chambers. Zonula occludens-1 (ZO-1) and phosphorylated myosin light chain were detected by immunohistochemistry. RESULTS The threefold increase in faecal serine protease activity seen in IBS-D patients compared with constipation-predominant IBS (IBS-C) or infectious diarrhoea is of neither epithelial nor inflammatory cell origin, nor is it coupled with antiprotease activity of endogenous origin. Mucosal application of faecal supernatants from IBS-D patients in mice evoked allodynia and increased CPP by 92%, both of which effects were prevented by serine protease inhibitors and dependent on PAR-2 expression. In mice, colonic exposure to supernatants from IBS-D patients resulted in a rapid increase in the phosphorylation of myosin light chain and delayed redistribution of ZO-1 in colonocytes. CONCLUSIONS Elevated colonic lumenal serine protease activity of IBS-D patients evokes a PAR-2-mediated colonic epithelial barrier dysfunction and subsequent allodynia in mice, suggesting a novel organic background in the pathogenesis of IBS.
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Affiliation(s)
- K Gecse
- Neuro-Gastroenterology and Nutrition Unit, Institut National de la Recherche Agronomique, 180 Chemin de Tournefeuille, BP 3, 31931 Toulouse Cedex 9, France
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Barreau F, Salvador-Cartier C, Houdeau E, Bueno L, Fioramonti J. Long-term alterations of colonic nerve-mast cell interactions induced by neonatal maternal deprivation in rats. Gut 2008; 57:582-90. [PMID: 18194988 DOI: 10.1136/gut.2007.126680] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Neonatal maternal deprivation induces colonic alterations in adult rats, such as hypersensitivity to distension or an increase in paracellular permeability, characteristics of irritable bowel syndrome (IBS) patients. Recent studies described neuroimmune alterations in the colonic mucosa of IBS patients. METHODS Male Wistar rats were submitted to maternal deprivation for 3 h daily during postnatal days 2-14, and were sacrificed at 4 or 12 weeks of age. Control pups were left undisturbed with their dam. RESULTS Colonic mast cell hyperplasia was observed at 4 and 12 weeks in maternally deprived rats, and was associated with an increase in protease content. Mucosal nerve fibre density assessed by protein gene product (PGP) 9.5 immunoreactivity was increased at 12 weeks but not at 4 weeks, while calcitonin gene-related protein (CGRP)-immunoreactive fibres remain constant. Synaptogenesis assessed by synaptophysin immunostaining was increased at 4 weeks but not at 12 weeks. The number of mast cells in close proximity to PGP 9.5- or CGRP-immunoreactive fibres was greater at both 4 and 12 weeks. Expression of neurokinin NK(1) receptors in the spinal cord was enhanced at 12 weeks. No significant change in total mast cell number, PGP 9.5 immunoreactivity and mast cells associated with PGP 9.5-immunoreactive fibres was observed in the jejunum. Treatment of pups with anti-nerve growth factor (NGF) antibodies abolished the increases in synaptogenesis and in the number of mast cells in close proximity to nerve fibres observed 4 weeks after maternal deprivation. CONCLUSIONS Neonatal maternal deprivation induces closer association of colonic mast cells with nerves, which is similar to that seen in IBS patients. NGF is a possible mediator of this effect.
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Affiliation(s)
- F Barreau
- Neurogastroenterology and Nutrition Unit, INRA, 180 Chemin de Tournefeuille, BP 3, F-31931 Toulouse cedex 9, France
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Fioramonti J, Bueno L. Hormonal Control of Gut Motility in Ruminants and Non-Ruminants and Its Nutritional Implications. Nutr Res Rev 2007; 1:169-88. [DOI: 10.1079/nrr19880013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Chassany O, Bonaz B, Bruley DES Varannes S, Bueno L, Cargill G, Coffin B, Ducrotté P, Grangé V. Acute exacerbation of pain in irritable bowel syndrome: efficacy of phloroglucinol/trimethylphloroglucinol. A randomized, double-blind, placebo-controlled study. Aliment Pharmacol Ther 2007; 25:1115-23. [PMID: 17439513 PMCID: PMC2683251 DOI: 10.1111/j.1365-2036.2007.03296.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Abdominal pain is the predominant symptom in irritable bowel syndrome patients. Phloroglucinol and its methylated derivative are antispasmodic agents acting on smooth muscle. AIM To evaluate the efficacy of phloroglucinol/trimethylphloroglucinol on pain intensity during an acute exacerbation of pain of irritable bowel syndrome over a 1-week period treatment. METHODS Irritable bowel syndrome Rome II patients seeking medical advice for an acute exacerbation of abdominal pain were randomized to phloroglucinol/trimethylphloroglucinol (62.2 mg P + 80 mg TMP) two pills three times daily or placebo for 7 days. Patients were included if they had a pain with a minimal intensity of 40 on a 100-mm visual analogue scale, and if pain occurred at least 2 days during the week previous inclusion. RESULTS Three hundred and seven patients were included by 78 general practitioners. The intent-to-treat population included 300 patients, aged of 46.9 +/- 14.8 years (73% female). The relative decrease of pain intensity at day 7 was 57.8 +/- 31.7% vs. 46.3 +/- 34.7% (Delta = 11.5 +/- 3.8%, [CI(95%): 4.0 ; 19.1], P = 0.0029) and the percentage of patients with at least a 50% decrease of pain intensity was 62% vs. 47% (Delta = 15.3 +/- 5.7%, [CI(95%): 4.1 ; 26.5], P = 0.0078) in phloroglucinol/trimethylphloroglucinol and placebo groups, respectively. CONCLUSIONS A 1-week phloroglucinol/trimethylphloroglucinol treatment significantly reduces pain intensity in irritable bowel syndrome patients consulting their general practitioners for pain exacerbation.
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Affiliation(s)
- O Chassany
- Département de la Recherche Clinique et du Développement, AP-HP, Hôpital Saint-Louis, University Paris 7, Paris, France.
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Affiliation(s)
- L Bueno
- Neurogastroenterology Unit, INRA, Toulouse, France
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32
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Róka R, Demaude J, Cenac N, Ferrier L, Salvador-Cartier C, Garcia-Villar R, Fioramonti J, Bueno L. Colonic luminal proteases activate colonocyte proteinase-activated receptor-2 and regulate paracellular permeability in mice. Neurogastroenterol Motil 2007; 19:57-65. [PMID: 17187589 DOI: 10.1111/j.1365-2982.2006.00851.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Luminal activation of protease-activated receptors-2 (PAR(2)) on colonocytes by trypsin or PAR(2)-activating peptide increases colonic paracellular permeability (CPP). The aim of this study was to evaluate the role of proteases from endogenous and bacterial origin in the modulation of CPP and colonocyte PAR(2) expression in mice. CPP was assessed with (51)Cr-EDTA after intracolonic administration of different protease inhibitors. After 12 days of oral antibiotic treatment, measurements of colonic luminal serine protease activity (CLSPA), CPP, mucosal mouse mast cell proteinase-1 (MMCP-1) content, immunochemistry of PAR(2) and assessment of effects of PAR(2) agonist (SLIGRL) and mast cell degranulator (C48/80) on CPP in Ussing chambers were performed. Immunochemistry was repeated after intracolonic trypsin administration. Colonic infusion of protease inhibitors significantly reduced CPP. In antibiotic-treated mice, CLSPA was reduced coupled with a decrease in PAR(2) expression, but with no change in CPP and MMCP-1 content. Trypsin administration restored PAR(2) expression. The increase in CPP induced by SLIGRL and C48/80 was reduced after antibiotic treatment. Protease activity of colonic content plays an important role in the regulation of mucosal barrier through activation of PAR(2).
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Affiliation(s)
- R Róka
- INRA Neuro-Gastroenterology & Nutrition Unit, Toulouse, France
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Bueno L, de Ponti F, Fried M, Kullak-Ublick GA, Kwiatek MA, Pohl D, Quigley EMM, Tack J, Talley NJ. Serotonergic and non-serotonergic targets in the pharmacotherapy of visceral hypersensitivity. Neurogastroenterol Motil 2007; 19:89-119. [PMID: 17280587 DOI: 10.1111/j.1365-2982.2006.00876.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Visceral hypersensitivity is considered a key mechanism in the pathogenesis of functional gastrointestinal (GI) disorders. Targeting visceral hypersensitivity seems an attractive approach to the development of drugs for functional GI disorders. This review summarizes current knowledge on targets for the treatment of visceral hypersensitivity, and the status of current and future drug and probiotic treatment development, and the role of pharmacogenomic factors.
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Affiliation(s)
- L Bueno
- Neurogastroenterology Unit INRA, Toulouse, France.
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Abstract
Activation of cannabinoid CB1 and CB2 receptors is known to attenuate nociception and hyperalgesia in somatic inflammatory conditions. The aim of this study was to determine whether cannabinoids modulate colonic sensitivity in basal and inflammatory conditions. The effects of CB1 and CB2 receptor agonists and antagonists on the abdominal contractile response to colorectal distension (CRD) in basal conditions and after 2,4,6-trinitrobenzenesulphonic acid-induced colitis were investigated. As previously described, colitis triggered a hypersensitivity to CRD. In basal conditions, both CB1 (WIN 55212-2) and CB2 (JWH 015) agonists reduced the abdominal response to CRD at a dose of 1 mg kg(-1), i.p. Both compounds were active at a lower dose (0.1 mg kg(-1)) abolishing the hypersensitivity induced by colitis. Administered alone, CB1 (Rimonabant) and CB2 (SR 144528) receptor antagonists (10 mg kg(-1)) had no effect on basal sensitivity. In contrast, the CB1, but not the CB2, receptor antagonist enhanced colitis-induced hyperalgesia. It is concluded that colonic inflammation enhances the antinociceptive action of CB1 and CB2 receptor agonists, and activates an endogenous, CB1 receptor mediated, antinociceptive pathway.
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Affiliation(s)
- M Sanson
- Neurogastroenterology and Nutrition Unit, INRA, Toulouse, France
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Ait-Belgnaoui A, Han W, Lamine F, Eutamene H, Fioramonti J, Bueno L, Theodorou V. Lactobacillus farciminis treatment suppresses stress induced visceral hypersensitivity: a possible action through interaction with epithelial cell cytoskeleton contraction. Gut 2006; 55:1090-4. [PMID: 16507583 PMCID: PMC1856261 DOI: 10.1136/gut.2005.084194] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Stress induced increase in colonic paracellular permeability results from epithelial cell cytoskeleton contraction and is responsible for stress induced hypersensitivity to colorectal distension (CRD). The probiotic Lactobacillus farciminis releases spontaneously nitric oxide (NO) in the colonic lumen in vivo and exerts anti-inflammatory effects. This study aimed: (i) to evaluate the effects of L farciminis on stress induced hypersensitivity to CRD and increase in colonic paracellular permeability; and (ii) to ascertain whether these effects are NO mediated and related to changes in colonocyte myosin light chain phosphorylation (p-MLC). METHODS Female Wistar rats received either 10(11) CFU/day of L farciminis or saline orally over 15 days before partial restraint stress (PRS) or sham-PRS application. Visceral sensitivity to CRD and colonic paracellular permeability was assessed after PRS or sham-PRS. Haemoglobin was used as an NO scavenger. Western blotting for MLC kinase, MLC, and p-MLC were performed in colonic mucosa from L farciminis treated and control rats after PRS or sham-PRS. RESULTS PRS significantly increased the number of spike bursts for CRD pressures of 30-60 mm Hg as well as colonic paracellular permeability. L farciminis treatment prevented both effects, while haemoglobin reversed the protective effects of L farciminis. p-MLC expression increased significantly from 15 to 45 minutes after PRS, and L farciminis treatment prevented this increase. CONCLUSION L farciminis treatment prevents stress induced hypersensitivity, increase in colonic paracellular permeability, and colonocyte MLC phosphorylation. This antinociceptive effect occurs via inhibition of contraction of colonic epithelial cell cytoskeleton and the subsequent tight junction opening, and may also involve direct or indirect effects of NO produced by this probiotic.
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Affiliation(s)
- A Ait-Belgnaoui
- Neuro-Gastroenterology and Nutrition Unit, UMR 1054 INRA/ESAP, Toulouse, France
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Demaude J, Salvador-Cartier C, Fioramonti J, Ferrier L, Bueno L. Phenotypic changes in colonocytes following acute stress or activation of mast cells in mice: implications for delayed epithelial barrier dysfunction. Gut 2006; 55:655-61. [PMID: 16299034 PMCID: PMC1856132 DOI: 10.1136/gut.2005.078675] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND AIMS Stressful life events are known to modulate the development or relapse of disease in both inflammatory bowel disease and irritable bowel disease patients but underlying mechanisms remain unclear. Stress is known to effect mast cells, interferon gamma (IFN-gamma), and myosin light chain phosphorylation to trigger colonic epithelial barrier dysfunction. The aim of this study was to investigate whether acute stress induced or chemical mast cell activation impaired expression and function of epithelial tight junctions, and altered colonocyte differentiation in mice. METHODS Colonic paracellular permeability was assessed as the in vivo lumen to blood ratio of 51Cr-EDTA in different groups of mice (controls, stressed, mast cell degranulator BrX-537A treated), pretreated or not with the mast cell stabiliser doxantrazole. Involvement of mast cells and IFN-gamma was evaluated in wild-type and IFN-gamma deficient mice. Tight junction alteration was assessed by histology, transmission electron microscopy, and real time reverse transcription-polymerase chain reaction. Colonocyte differentiation was determined by protein kinase C zeta (PKCzeta) immunofluorescence and western blotting, and alkaline phosphatase activity assay. RESULTS Acute stress induced a three day delayed increase in colonic paracellular permeability which involved mast cell degranulation and overproduction of IFN-gamma. The colonic epithelial barrier was morphologically altered and expression of mRNA encoding tight junction proteins ZO-2 and occludin was decreased. Moreover, three days after acute stress, colonocyte differentiation was reduced, as shown by decreased expression of both PKCzeta isotype and alkaline phosphatase. CONCLUSION These data highlight new mechanisms whereby an acute stress acts on the gastrointestinal tract by inducing alterations in colonocyte differentiation and decreased expression of mRNA encoding tight junction proteins. Thus phenotypic changes in colonocytes could pave the way for stress related intestinal disorders.
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Affiliation(s)
- J Demaude
- Neuro-Gastroenterology and Nutrition Unit, Institut National de la Recherche Agronomique, Toulouse, France
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Eutamene H, Theodorou V, Schmidlin F, Tondereau V, Garcia-Villar R, Salvador-Cartier C, Chovet M, Bertrand C, Bueno L. LPS-induced lung inflammation is linked to increased epithelial permeability: role of MLCK. Eur Respir J 2005; 25:789-96. [PMID: 15863634 DOI: 10.1183/09031936.05.00064704] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The respiratory system is directly exposed to low levels of lipopolysaccharide (LPS), present as a contaminant on airborne particles. In cystic fibrosis, the prevailing data identify structural changes of the airway epithelium, as well as tight junction dilatation. This study was aimed at determining the contribution of myosin light chain kinase to maintaining airway epithelium barrier integrity in the lung inflammatory response to LPS in rats. The effects of the selective myosin light chain kinase inhibitor, 5-iodonaphthalene-1-sulphonyl-homopiperazine (ML-7), were evaluated: 1) on pulmonary inflammation and airway epithelium barrier permeability alterations induced by intra-tracheal LPS from Pseudomonas aeruginosa; and 2) on levels of the phosphorylated form of the myosin light chain, which is increased in a human airway epithelial cell line (NCI-H292) and tracheal tissue after LPS exposure. The results show that LPS increased airway epithelium barrier paracellular permeability and lung inflammation, and that pre-treatment with ML-7 inhibited both effects. This effect of ML-7 was associated with the inhibition of phosphorylated myosin light chain in both NCI-H292 cells and tracheal tissue. The data, obtained using in vivo and in vitro approaches, demonstrate a key role for myosin light chain kinase in lung inflammation, and suggest that myosin light chain kinase could be a potential target for novel drugs intended for relief of lung injury.
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Affiliation(s)
- H Eutamene
- Purpan College of Agriculture, Toulouse, France.
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Abstract
BACKGROUND Stressful events in the early period of life (for example, maternal deprivation) have been shown to modify adult immune and gastrointestinal tract functions. The present study aimed to establish whether maternal deprivation affects colonic epithelial barrier and the development of an experimental colitis in adult rats. METHODS Male Wistar rat pups were separated during postnatal days 2-14 or left undisturbed with their dam. At 12 weeks of age, we assessed colonic paracellular permeability, bacterial translocation, myeloperoxidase (MPO) activity, mucosal mast cell density, cytokine (interleukin (IL)-1 beta, IL-2, IL-4, IL-10, and interferon gamma (IFN-gamma)) mRNA expression, and macroscopic damage. Total gut permeability, MPO activity, and macroscopic damage were also assessed four days after intracolonic administration of 2,4,6-trinitrobenzenesulphonic acid (TNBS). RESULTS Maternal deprivation triggered a significant increase in colonic permeability associated with bacterial translocation into the mesenteric lymph nodes, liver, and spleen. These alterations were associated with some macroscopic damage and an increase in colonic MPO activity, mucosal mast cell density, and cytokine mRNA expression. Intracolonic infusion of TNBS induced a significantly higher inflammatory reaction in separated animals, as judged by enhanced MPO colonic levels, total gut permeability, and macroscopic lesions. CONCLUSIONS Maternal deprivation promotes long term alterations in the colonic epithelial barrier associated with an exaggerated immune response to an external immune stimulus. This suggests a role for early psychological factors in the regulation of colonic mucosal barrier in later life.
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Affiliation(s)
- F Barreau
- Neurogastroenterology and Nutrition Unit, Institut National de la Recherche Agronomique, Toulouse, France
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Lamine F, Fioramonti J, Bueno L, Nepveu F, Cauquil E, Lobysheva I, Eutamène H, Théodorou V. Nitric oxide released by Lactobacillus farciminis improves TNBS-induced colitis in rats. Scand J Gastroenterol 2004; 39:37-45. [PMID: 14992560 DOI: 10.1080/00365520310007152] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Beneficial effects of lactobacilli have been reported in experimental colitis. On the other hand, despite the controversial role of nitric oxide (NO) in the inflammatory gut process, a protective action of exogenous NO in inflammation has been suggested. Consequently, this study aimed to determine the effect of (i) sodium nitroprusside (SNP), a NO donor and (ii) treatment with Lactobacillus farciminis, which produces NO in vitro, on trinitrobenzene sulphonic acid (TNBS)-induced colitis in rats and to evaluate the role of exogenous NO in this effect. METHODS Rats were divided into three groups receiving one of the following: (i) a continuous intracolonic (IC) infusion of SNP for 4 days, (ii) L. farciminis orally for 19 days, or (iii) saline. On day 1 and day 15, respectively, TNBS and saline were administrated IC, followed by a continuous IC infusion of saline or haemoglobin, a NO scavenger. At the end of treatments, the following parameters were evaluated: macroscopic damage of colonic mucosa, myeloperoxidase and nitric oxide synthase activities and colonic luminal NO production. RESULTS In colitic rats, SNP and L. farciminis treatment significantly (P < 0.05) reduced macroscopic damage scores, myeloperoxidase and nitric oxide synthase activities compared to controls. Haemoglobin infusion abolished the anti-inflammatory effect of both NO donor treatments, but had no effect per se on colitis. CONCLUSION NO released intraluminally by SNP infusion or by L. farciminis given orally improves TNBS-induced colitis in rats. These results indicate a protective role of NO donation in colonic inflammation and show for the first time a mechanism involving NO delivery by a bacterial strain reducing an experimental colitis.
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Affiliation(s)
- F Lamine
- Neuro-Gastroenterology and Nutrition Unit, INRA, Toulouse, France
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Fioramonti J, Gaultier E, Toulouse M, Sanger GJ, Bueno L. Intestinal anti-nociceptive behaviour of NK3 receptor antagonism in conscious rats: evidence to support a peripheral mechanism of action. Neurogastroenterol Motil 2003; 15:363-9. [PMID: 12846724 DOI: 10.1046/j.1365-2982.2003.00420.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The involvement of neurokinin receptors in visceral nociception is well documented. However, the role and localization of NK3 receptors is not clearly established. This study was designed to determine whether NK3 receptor antagonists crossing (talnetant) or not (SB-235375) the blood-brain barrier reduce the nociceptive response to colo-rectal distension (CRD) and whether NK3 antagonism reduces inflammation- or stress-induced hypersensitivity to rectal distension. Isobaric CRD and isovolumic rectal distensions were performed in rats equipped with intramuscular electrodes to record abdominal muscle contractions. In controls, CRD induced a pressure-related (15-60 mmHg) increase in the number of abdominal contractions. Both talnetant and SB-235375 [50 mg x kg-1, per oral (p.o.)], which had no effect on colo-rectal tone, reduced the number of contractions associated with CRDs from 30 to 60 mmHg. Three days after rectal instillation of TNBS, abdominal contractions were increased for rectal distension volume of 0.4 mL. This effect was not modified by talnetant (30 mg x kg-1, p.o.). Partial restraint stress increased abdominal contractions at all distension volumes (0-1.2 mL). Talnetant (10 mg kg-1, p.o.) abolished the increase observed for 0.8 and 1.2 mL. These results indicate that peripheral NK3 receptor antagonism reduced nociception associated with CRD and hypersensitivity induced by stress but not inflammation.
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Affiliation(s)
- J Fioramonti
- Neurogastroenterology & Nutrition Unit, INRA, Toulouse, France.
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Theodorou V, Chovet M, Eutamene H, Fargeau H, Dassaud M, Toulouse M, Bihoreau C, Roman FJ, Bueno L. Antidiarrhoeal properties of a novel sigma ligand (JO 2871) on toxigenic diarrhoea in mice: mechanisms of action. Gut 2002; 51:522-8. [PMID: 12235074 PMCID: PMC1773374 DOI: 10.1136/gut.51.4.522] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND AND AIMS Sigma ligands display antisecretory activity against various secretagogues, suggesting antidiarrhoeal properties. In this study, we evaluated: (i) the antidiarrhoeal effect of JO 2871, a high affinity sigma ligand, in three models of toxigenic diarrhoea in mice; and (ii) the site and mechanism of action of this compound. METHODS Faeces were collected after toxin or vehicle administration in male DBA2 or NMRI mice. Diarrhoea was determined by cumulative stool weight (mg) over a 120 minute period. Diarrhoea was induced by intravenous administration of Salmonella enteriditis lipopolysaccharide (LPS), or oral administration of Escherichia coli heat stable (E coli-sta) or Clostridium difficile toxins. Two sigma ligands, igmesine and JO 2871, were administered either orally or intravenously, 60 and 30 minutes before the toxins, respectively. JO 2871 was also given orally 30 minutes after E coli-sta. In addition, JO 2871 was administered intracerebroventricularly five minutes before LPS and E coli-sta. BMY 14802 (1000 microg/kg orally), a sigma receptor antagonist, or cyclosomatostatin (CSS 1 microg/kg intravenously), a somatostatin antagonist, were given five minutes prior to JO 2871 in LPS, E coli-sta, and C difficile toxin treated mice. Gastric emptying and intestinal transit were evaluated after oral JO 2871 and BMY 14802 and intravenous CSS. RESULTS Stool weight measured 120 minutes after administration of the toxins was significantly increased. Oral JO 2871 and igmesine dose dependently inhibited toxigenic diarrhoea in all models. ED(50) values obtained using JO 2871 (1-20 microg/kg) were more than 40 times lower than those obtained with igmesine. Oral JO 2871 given after E coli-sta also inhibited diarrhoea in a dose dependent manner (ED(50) 50 microg/kg). Both sigma ligands were active by the intravenous route on LPS and E coli-sta induced stool weight increases. JO 2871 administered intracerebroventricularly failed to block this effect at any dose tested. Both BMY 14802 and CSS reversed the antidiarrhoeal effect of oral JO 2871. JO 2871, BMY 14802, and CSS did not affect transit parameters. CONCLUSIONS JO 2871 exerts a potent oral antidiarrhoeal effect, acting peripherally through sigma sites and somatostatin release.
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Affiliation(s)
- V Theodorou
- Ecole Superieure d'Agriculture de Purpan, 75 voie du Toec, 31076 Toulouse, France.
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Abstract
The evidence relating to the site and mechanism of action of "centrally acting" agents which may affect visceral sensitivity is reviewed. Antidepressant drugs such as amitriptyline as well as the newer selective serotonin reuptake inhibitors are thought to act at the level of the CNS. Opiates, including morphine as well as compounds such as trimebutine or fedotozine designed for therapeutic use in irritable bowel syndrome, are effective in reducing visceral nociception. Cytokines in the CNS are known to be involved in the modulation of pain and there is also evidence to suggest that centrally acting cytokines may play a role in the production of visceral hypersensitivity. Consequently, they may provide an interesting target for future research.
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Affiliation(s)
- J Fioramonti
- NeuroGastroenterology and Nutrition Unit, Institut National de la Recherche Agronomique, 180 Chemin de Tournefeuille, BP 3, 31931 Toulouse, France.
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Abstract
Visceral hypersensitivity is currently the most widely accepted mechanism responsible for abdominal pain. Inflammatory mediators are known to sensitise primary afferents and to recruit silent nociceptors. Recent evidence suggests that non-inflammatory mediators also have the potential to trigger visceral pain. This sequence of events may constitute part of an alerting system which prompts the central nervous system to correct gastrointestinal responses to ingestion.
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Affiliation(s)
- L Bueno
- Department of Neurogastroenterology and Nutrition, Institut National de la Recherche Agronomique, Neurogastroenterology Unit INRA, 180 Chemin de Tournefeville, BP3 31931 Toulouse Cedex 9, France.
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Abstract
BACKGROUND AND AIMS Psychological factors have been implicated in the aetiology of irritable bowel syndrome characterised by intestinal altered motility and visceral hypersensitivity. Similar disorders have been found in rats under stressful conditions. The role of tachykinins in bowel dysfunctions caused by stress is not fully documented. Therefore, we investigated the influence of stress on NK1 receptor activation at the colonic level in female rats. METHODS The stress procedure used consisted of two hours of partial restraint. Histamine release was measured from colonic samples of control and stressed animals and the effect of SR140333, a NK1 receptor antagonist, on substance P induced histamine release was determined. Involvement of steroids has been evaluated in this response. RESULTS NK1 receptor antagonist was found to inhibit substance P induced histamine release in samples from stressed female rats but not in samples from control animals. Previous treatment of female rats with RU 486 abolished this effect observed in stressed animals. Similarly, in samples from stressed female rats previously ovariectomised, SR140333 failed to inhibit substance P induced histamine release but previous treatment with both progesterone and oestrogen restored its effect. CONCLUSIONS Stress induces NK1 receptor activation in the colon, and ovarian steroids are involved in this response.
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Affiliation(s)
- S Bradesi
- Institut National de la Recherche Agronomique, Department of Neurogastroenterology and Nutrition, 180, Chemin de Tournefeuille, BP 3, 31931 Toulouse Cedex 9, France
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Lecci A, Carini F, Tramontana M, D'Aranno V, Marinoni E, Crea A, Bueno L, Fioramonti J, Criscuoli M, Giuliani S, Maggi CA. Nepadutant pharmacokinetics and dose-effect relationships as tachykinin NK2 receptor antagonist are altered by intestinal inflammation in rodent models. J Pharmacol Exp Ther 2001; 299:247-54. [PMID: 11561086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
Tachykinin NK2 receptor antagonists could reduce motility and symptoms during gastrointestinal diseases characterized by local inflammation such as diarrhea or colitis; however, how these conditions change pharmacodynamic and pharmacokinetic characteristics of NK2 receptor antagonists is unknown. We investigated the effect of the peptide NK2 receptor antagonist nepadutant on spontaneous intestinal motility or [betaAla8]NKA(4-10)-induced colonic and bladder contractions in rodent models of intestinal inflammation (enteritis induced by castor oil and rectocolitis induced by local instillation of acetic acid in rats, enteritis induced by bacterial toxins in mice). In the castor oil model, the oral/intraduodenal bioavailability of nepadutant was also determined. The intrarectal (i.r.) administration of nepadutant (100 nmol/kg) did not reduce [betaAla8]NKA(4-10) (10 nmol/kg i.v.)-induced colonic and bladder contractions in normal animals, but the same dose of nepadutant produced an inhibitory effect in the two organs following rectocolitis; in contrast, nepadutant is equieffective by the intravenous route in normal and colitic animals. In this model, nepadutant (100 nmol/kg i.r. or i.v.) decreased spontaneous colonic hypermotility, without affecting motility in controls. The intraduodenal administration of nepadutant (30 nmol/kg), which was ineffective on [betaAla8]NKA(4-10) (10 nmol/kg i.v.)-induced colonic and bladder contractions in control animals, abolished bladder contractions in castor oil-pretreated animals. In this latter group, the oral and intraduodenal bioavailability of nepadutant showed a 7- to 9-fold increase with respect to controls. Oral administration of nepadutant, in nanomolar or subnanomolar dosage, reduced diarrhea induced by bacterial toxins in mice. It is concluded that intestinal inflammation increases nepadutant absorption in the intestine, enhancing its activity. These results suggest that a drug with a limited oral bioavailability could be used for treating gastrointestinal diseases associated with a local inflammation.
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Affiliation(s)
- A Lecci
- Pharmacology Department, Menarini Ricerche, Firenze, Italy.
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Coelho AM, Jacob L, Fioramonti J, Bueno L. Rectal antinociceptive properties of alverine citrate are linked to antagonism at the 5-HT1A receptor subtype. J Pharm Pharmacol 2001; 53:1419-26. [PMID: 11697552 DOI: 10.1211/0022357011777783] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Serotonin (5-HT) is considered as a major mediator causing hyperalgesia and is involved in inflammatory reactions and irritable bowel syndrome. Alverine citrate may possess visceral antinociceptive properties in a rat model of rectal distension-induced abdominal contractions. This study was designed to evaluate the pharmacological properties of alverine citrate in a rat model of rectal hyperalgesia induced by 5-HTP (5-HT precursor) and by a selective 5-HT1A agonist (8-OH-DPAT) and to compare this activity with a reference 5-HT1A antagonist (WAY 100635). At 4 h after their administration, 5-HTP and 8-OH-DPAT increased the number of abdominal contractions in response to rectal distension at the lowest volume of distension (0.4 mL). When injected intraperitoneally before 8-OH-DPAT and 5-HTP, WAY 100635 (1 mg kg(-1)) blocked their nociceptive effect, but also reduced the response to the highest volume of distension (1.6 mL). Similarly, when injected intraperitoneally, alverine citrate (20 mg kg(-1)) suppressed the effect of 5-HTP, but not that of 8-OH-DPAT. However, when injected intracerebroventricularly (75 microg/rat) alverine citrate reduced 8-OH-DPAT-induced enhancement of rectal distension-induced abdominal contractions. In-vitro binding studies revealed that alverine citrate had a high affinity for 5-HT1A receptors and a weak affinity for 5-HT3 and 5-HT4 subtypes. These results suggest that 5-HTP-induced rectal hypersensitivity involves 5-TH1A receptors and that alverine citrate acts as a selective antagonist at the 5-HT1A receptor subtype to block both 5-HTP and 8-OH-DPAT-induced rectal hypersensitivity.
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Affiliation(s)
- A M Coelho
- Department of Pharmacology, Institut National de la Recherche Agronomique, Toulouse, France
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Fioramonti J, Bueno L, Delvaux M, Frexinos J. [Old and new physiopathological concepts of irritable bowel syndrome]. Gastroenterol Clin Biol 2001; 25:C34-41. [PMID: 11787378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
MESH Headings
- Adult
- Animals
- Antidepressive Agents/administration & dosage
- Antidepressive Agents/therapeutic use
- Antidepressive Agents, Second-Generation/administration & dosage
- Antidepressive Agents, Second-Generation/therapeutic use
- Antidepressive Agents, Tricyclic/administration & dosage
- Antidepressive Agents, Tricyclic/therapeutic use
- Benzyl Compounds/administration & dosage
- Benzyl Compounds/therapeutic use
- Biopsy
- Colon/pathology
- Colonic Diseases, Functional/diet therapy
- Colonic Diseases, Functional/drug therapy
- Colonic Diseases, Functional/etiology
- Colonic Diseases, Functional/pathology
- Colonic Diseases, Functional/physiopathology
- Colonic Diseases, Functional/psychology
- Diarrhea/etiology
- Electromyography
- Female
- Fluoxetine/administration & dosage
- Fluoxetine/therapeutic use
- Food Hypersensitivity/complications
- Gastrointestinal Motility
- Guinea Pigs
- Humans
- Ileum/pathology
- Imipramine/administration & dosage
- Imipramine/therapeutic use
- Inflammation
- Male
- Mental Disorders/complications
- Propylamines/administration & dosage
- Propylamines/therapeutic use
- Psychotherapy
- Psychotropic Drugs/administration & dosage
- Psychotropic Drugs/therapeutic use
- Rats
- Selective Serotonin Reuptake Inhibitors
- Sex Offenses
- Time Factors
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Affiliation(s)
- J Fioramonti
- Unité Mixte de Recherche en Neurogastroentérologie et Nutrition, INRA-Université Paul Sabatier, Toulouse, BP 3, 31931.
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Anton PM, Theodorou V, Fioramonti J, Bueno L. Chronic low-level administration of diquat increases the nociceptive response to gastric distension in rats: role of mast cells and tachykinin receptor activation. Pain 2001; 92:219-27. [PMID: 11323143 DOI: 10.1016/s0304-3959(01)00257-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Dietary factors can modulate visceral sensitivity and are suggested to interact with neuroimmune pathways. To determine whether daily low-level exposure to a food contaminant (diquat) alters sensitivity to gastric distension (GD) and the role of mast cells and tachykinin receptors activation, two series of experiments were conducted in eight groups of eight male Wistar rats (200-250 g) receiving daily doses of either diquat (0.1 mg/kg per day orally) or water for 21 days. In the first series, rats were sacrificed at the end of treatments and the gastric mucosal mast cell (MMC) number was histologically quantified. In the second series, after 21 days of treatment the cardiovascular depressor (CVD) response and corresponding gastric volumes were recorded under GD (from 10 to 40 mmHg). Doxantrazole (5 mg/kg intraperitoneally (i.p.)), a mast cell stabilizer, and SR 140333 (1 mg/kg i.p.) and MEN 11420 (0.1 mg/kg intravenously), respectively NK1 and NK2 receptor antagonists, were administered before GD. Before and after GD, blood samples were taken to measure blood histamine and the gastric MMC number was determined after sacrifice. Diquat treatment increased the MMC number. In diquat-treated rats, GD increased the CVD response and blood histamine level and induced MMC degranulation. Doxantrazole did not modify the hypersensitivity to GD but prevented mast cell degranulation. Both NK1 and NK2 receptor antagonists blocked the enhanced CVD response induced by diquat and prevented mast cell degranulation. None of the drugs had any effect in control animals. Prolonged exposure to a food contaminant at doses possibly found in food increases gastric sensitivity to distension, activates tachykinin receptors and results in MMC degranulation after GD.
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Affiliation(s)
- P M Anton
- Neuro-Gastroenterology and Nutrition Unit, INRA, 180 chemin de Tournefeuille, BP3, 31931 Cedex 09, Toulouse, France
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Picard C, Wysocki J, Linard C, Garcia-Villar R, Bueno L, Griffiths NM, Fioramonti J. Absence of protective role of afferent nerves in early intestinal mucosal alterations induced by abdominal irradiation in rats. Int J Radiat Biol 2001; 77:349-56. [PMID: 11258849 DOI: 10.1080/09553000010002889] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
PURPOSE To assess the early effects of primary afferent nerve suppression by systemic treatment with the neurotoxin capsaicin in an acute model of abdominal irradiation in rats (10Gy, gamma). MATERIALS AND METHODS Changes in myeloperoxidase (MPO) activity, calcitonin gene-related peptide (CGRP) tissue content, number of mast cells and apoptotic cells were determined in jejunum and ileum in four groups of rat male Wistar (vehicle sham-irradiated, vehicle irradiated, capsaicin sham-irradiated and capsaicin irradiated) at 1 and 3 days post-irradiation. RESULTS In vehicle irradiated rats, CGRP was significantly increased from the first day after irradiation in jejunal mucosa; MPO activity increased in both segments at day 3 but not at day 1 after irradiation; the number of detectable mucosal mast cells dropped to nearly zero on days 1 and 3, while the apoptotic cells in the intestinal mucosa were significantly increased at day 1. Similar results were obtained for mast cells and apoptosis in capsaicin irradiated rats as compared to capsaicin sham-irradiated rats, while MPO activity was significantly increased and CGRP concentration in jejunal mucosa significantly decreased from the first day in these rats in comparison with capsaicin sham-irradiated rats. CONCLUSIONS Intestinal sensory innervation seems not to have a major protective role against a radiation-induced intestinal inflammatory reaction.
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Affiliation(s)
- C Picard
- Institut de Protection et de Sureté Nucléaire, Digestive Radiobiology Unit, Fontenay-aux-Roses, France.
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