Anna Carrasco1, Maria Esteve1, Antonio Salas2, Elisabet Pedrosa3, Mercè Rosinach1, Montserrat Aceituno1, Yamile Zabana1, Fernando Fernández-Bañares4. 1. Department of Gastroenterology, Hospital Universitari Mútua Terrassa, Fundació Recerca Mútua Terrassa, Terrassa, Barcelona, Spain Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Terrassa, Barcelona, Spain. 2. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Terrassa, Barcelona, Spain Department of Pathology, Hospital Universitari MútuaTerrassa, Terrassa, Barcelona, Spain. 3. Department of Gastroenterology, Hospital Universitari Mútua Terrassa, Fundació Recerca Mútua Terrassa, Terrassa, Barcelona, Spain. 4. Department of Gastroenterology, Hospital Universitari Mútua Terrassa, Fundació Recerca Mútua Terrassa, Terrassa, Barcelona, Spain Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Terrassa, Barcelona, Spain ffbanares@mutuaterrassa.es.
Abstract
BACKGROUND: Lymphocytic (LC) and collagenous (CC) colitis are the two major forms of microscopic colitis (MC). The aim of this study was to identify similarities and differences in their mucosal immune characteristics. METHODS: Colonic biopsies from 15 CC, 8 LC, and 10 healthy controls were collected. Mucosal lymphocytes were assessed by flow cytometry. Tissue gene expression and protein levels were determined by real-time PCR and ELISA, respectively. RESULTS: LC patients had lower numbers of CD4(+) and double-positive CD4(+)CD8(+)mucosal T lymphocytes, and higher numbers of CD8(+) and CD4(+)TCRγδ(+) mucosal T cells, compared with controls and CC patients. Regulatory Treg (CD4(+)CD25(+)FOXP3(+)) and double-negative (CD3(+)CD4(-)CD8(-)) T cell percentages were higher in both CC and LC compared with controls, coupled with higher levels of the anti-inflammatory IL-10, both at mRNA and protein levels. By contrast, Th1 and Th17 cells were lower in both CC and LC, although gene expression of Th1/Th17 cytokines was higher in both. CONCLUSION: CC and LC share some regulatory and effector mechanisms, but not others. Higher IL-10 levels and higher Treg and double-negative T cell percentages, found in both CC and LC, could be responsible for the lack of progression of structural damage and the blockade of proinflammatory cytokine production. However, CC and LC are revealed as separate, independent entities, as they show clearly different mucosal lymphocyte profiles, which could be caused by different luminal triggers of the two diseases. Hence, CC and LC are two closely related but independent intestinal disorders.
BACKGROUND: Lymphocytic (LC) and collagenous (CC) colitis are the two major forms of microscopic colitis (MC). The aim of this study was to identify similarities and differences in their mucosal immune characteristics. METHODS: Colonic biopsies from 15 CC, 8 LC, and 10 healthy controls were collected. Mucosal lymphocytes were assessed by flow cytometry. Tissue gene expression and protein levels were determined by real-time PCR and ELISA, respectively. RESULTS: LC patients had lower numbers of CD4(+) and double-positive CD4(+)CD8(+)mucosal T lymphocytes, and higher numbers of CD8(+) and CD4(+)TCRγδ(+) mucosal T cells, compared with controls and CC patients. Regulatory Treg (CD4(+)CD25(+)FOXP3(+)) and double-negative (CD3(+)CD4(-)CD8(-)) T cell percentages were higher in both CC and LC compared with controls, coupled with higher levels of the anti-inflammatory IL-10, both at mRNA and protein levels. By contrast, Th1 and Th17 cells were lower in both CC and LC, although gene expression of Th1/Th17 cytokines was higher in both. CONCLUSION: CC and LC share some regulatory and effector mechanisms, but not others. Higher IL-10 levels and higher Treg and double-negative T cell percentages, found in both CC and LC, could be responsible for the lack of progression of structural damage and the blockade of proinflammatory cytokine production. However, CC and LC are revealed as separate, independent entities, as they show clearly different mucosal lymphocyte profiles, which could be caused by different luminal triggers of the two diseases. Hence, CC and LC are two closely related but independent intestinal disorders.
Authors: Laura Francesca Pisani; Gian Eugenio Tontini; Beatrice Marinoni; Vincenzo Villanacci; Barbara Bruni; Maurizio Vecchi; Luca Pastorelli Journal: Front Med (Lausanne) Date: 2017-05-10
Authors: Joana Torres; Carolina Palmela; Pedro Gomes de Sena; Maria Pia Costa Santos; Catarina Gouveia; Maria Helena Oliveira; Ana Raquel Henriques; Cecília Rodrigues; Marília Cravo; Paula Borralho Journal: GE Port J Gastroenterol Date: 2017-10-11