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Jooss T, Zhang J, Zimmer B, Rezzonico-Jost T, Rissiek B, Felipe Pelczar P, Seehusen F, Koch-Nolte F, Magnus T, Zierler S, Huber S, Schemann M, Grassi F, Nicke A. Macrophages and glia are the dominant P2X7-expressing cell types in the gut nervous system-No evidence for the role of neuronal P2X7 receptors in colitis. Mucosal Immunol 2023; 16:180-193. [PMID: 36634819 DOI: 10.1016/j.mucimm.2022.11.003] [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] [Received: 11/23/2022] [Accepted: 11/29/2022] [Indexed: 01/11/2023]
Abstract
The blockade or deletion of the pro-inflammatory P2X7 receptor channel has been shown to reduce tissue damage and symptoms in models of inflammatory bowel disease, and P2X7 receptors on enteric neurons were suggested to mediate neuronal death and associated motility changes. Here, we used P2X7-specific antibodies and nanobodies, as well as a bacterial artificial chromosome transgenic P2X7-EGFP reporter mouse model and P2rx7-/- controls to perform a detailed analysis of cell type-specific P2X7 expression and possible overexpression effects in the enteric nervous system of the distal colon. In contrast to previous studies, we did not detect P2X7 in neurons but found dominant expression in glia and macrophages, which closely interact with the neurons. The overexpression of P2X7 per se did not induce significant pathological effects. Our data indicate that macrophages and/or glia account for P2X7-mediated neuronal damage in inflammatory bowel disease and provide a refined basis for the exploration of P2X7-based therapeutic strategies.
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Affiliation(s)
- Tina Jooss
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig Maximilian University, Munich, Germany
| | - Jiong Zhang
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig Maximilian University, Munich, Germany
| | - Béla Zimmer
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig Maximilian University, Munich, Germany
| | - Tanja Rezzonico-Jost
- Institute for Research in Biomedicine, Faculty of Biomedical Sciences, Università della Svizzera Italiana, Bellinzona, Switzerland
| | - Björn Rissiek
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | - Frauke Seehusen
- Laboratory for Animal Model Pathology (LAMP), Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Friedrich Koch-Nolte
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tim Magnus
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Susanna Zierler
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig Maximilian University, Munich, Germany; Institute of Pharmacology, Medical Faculty, Johannes Kepler University Linz, Linz, Austria
| | - Samuel Huber
- Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Michael Schemann
- Human Biology, Technical University Munich, Freising-Weihenstephan, Germany
| | - Fabio Grassi
- Institute for Research in Biomedicine, Faculty of Biomedical Sciences, Università della Svizzera Italiana, Bellinzona, Switzerland
| | - Annette Nicke
- Walther Straub Institute of Pharmacology and Toxicology, Faculty of Medicine, Ludwig Maximilian University, Munich, Germany.
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