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Bruneau J, Khater S, Isnard P, Lhermitte L, Brouzes C, Sibon D, Asnafi V, Berrebi D, Rabant M, Neven B, Cellier C, Hermine O, Molina TJ. [Immunopathology of the small intestine]. Ann Pathol 2023:S0242-6498(23)00080-9. [PMID: 37156715 DOI: 10.1016/j.annpat.2023.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/14/2023] [Accepted: 03/15/2023] [Indexed: 05/10/2023]
Abstract
The gastrointestinal tract is the site of exciting immunological interactions between the epithelium and the mucosa-associated lymphoid tissue, leading to the immune response to food and microbial antigens in the digestive lumen. The objective of this review is to present the main dysimmune pathologies of the digestive tract leading to an enteropathy. As examples, we describe celiac and non-celiac enteropathies to clarify a florid diagnostic framework, by identifying a spectrum of elementary lesions, which must be confronted with the clinico biological context of the patient to orient the diagnosis. The microscopic lesions observed are most often non-specific and may be encountered in several diagnostic settings. Moreover, it is a set of elementary lesions in each clinical context that will orient the diagnostic framework. Celiac disease is the main etiology of enteropathy with villous atrophy, its diagnosis is multidisciplinary and there are many differential diagnoses. We will discuss celiac disease lymphomatous complications as enteropathy associated T-cell lymphoma including refractory sprue type 2. We will then present the non-celiac enteropathies. Among these, enteropathies of unknown etiology may be associated with a primary immune deficiency that may be reflected by florid lymphoid hyperplasia of the gastrointestinal tract and/or be associated with an infectious etiology that should also be constantly sought. Finally, we will discuss of induced enteropathy by new immunomodulatory treatments.
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Affiliation(s)
- Julie Bruneau
- Service d'anatomie et de cytologie pathologique, hôpitaux universitaires Necker-Enfants Malades et Robert Debré, AP-HP, université de Paris Cité, Paris, France.
| | - Shérine Khater
- Service de gastro-entérologie, hôpital européen Georges-Pompidou, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris Cité, Paris, France
| | - Pierre Isnard
- Service d'anatomie et de cytologie pathologique, hôpitaux universitaires Necker-Enfants Malades et Robert Debré, AP-HP, université de Paris Cité, Paris, France
| | - Ludovic Lhermitte
- Laboratoire d'onco-hématologie, hôpital universitaire Necker-Enfants Malades, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris Cité, Paris, France
| | - Chantal Brouzes
- Laboratoire d'onco-hématologie, hôpital universitaire Necker-Enfants Malades, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris Cité, Paris, France
| | - David Sibon
- Service d'hématologie, hôpital Henri-Mondor, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris-Est-Créteil, Créteil, France
| | - Vahid Asnafi
- Laboratoire d'onco-hématologie, hôpital universitaire Necker-Enfants Malades, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris Cité, Paris, France
| | - Dominique Berrebi
- Service d'anatomie et de cytologie pathologique, hôpitaux universitaires Necker-Enfants Malades et Robert Debré, AP-HP, université de Paris Cité, Paris, France
| | - Marion Rabant
- Service d'anatomie et de cytologie pathologique, hôpitaux universitaires Necker-Enfants Malades et Robert Debré, AP-HP, université de Paris Cité, Paris, France
| | - Bénédicte Neven
- Service d'immuno-hématologie et rhumatologie pédiatrique, hôpital universitaire Necker-Enfants Malades, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris Cité, Paris, France
| | - Christophe Cellier
- Service de gastro-entérologie, hôpital européen Georges-Pompidou, Assistance publique-Hôpitaux de Paris (AP-HP), université Paris Cité, Paris, France
| | - Olivier Hermine
- Service d'hématologie, hôpital universitaire Necker-Enfants Malades, Assistance publique-Hôpitaux de Paris, AP-HP, université Paris Cité, Paris, France
| | - Thierry Jo Molina
- Service d'anatomie et de cytologie pathologique, hôpitaux universitaires Necker-Enfants Malades et Robert Debré, AP-HP, université de Paris Cité, Paris, France
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Charpentier E, Ménard S, Marques C, Berry A, Iriart X. Immune Response in Pneumocystis Infections According to the Host Immune System Status. J Fungi (Basel) 2021; 7:jof7080625. [PMID: 34436164 PMCID: PMC8399367 DOI: 10.3390/jof7080625] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/28/2021] [Accepted: 07/29/2021] [Indexed: 12/12/2022] Open
Abstract
The host immune response is critical in Pneumocystis pneumonia (PCP). Immunocompetent hosts can eliminate the fungus without symptoms, while immunodeficient hosts develop PCP with an unsuitable excessive inflammatory response leading to lung damage. From studies based on rodent models or clinical studies, this review aimed to better understand the pathophysiology of Pneumocystis infection by analysing the role of immune cells, mostly lymphocytes, according to the immune status of the infected host. Hence, this review first describes the immune physiological response in infected immunocompetent hosts that are able to eliminate the fungus. The objective of the second part is to identify the immune elements required for the control of the fungus, focusing on specific immune deficiencies. Finally, the third part concentrates on the effect of the different immune elements in immunocompromised subjects during PCP, to better understand which cells are detrimental, and which, on the contrary, are beneficial once the disease has started. This work highlights that the immune response associated with a favourable outcome of the infection may differ according to the immune status of the host. In the case of immunocompetency, a close communication between B cells and TCD4 within tertiary lymphocyte structures appears critical to activate M2 macrophages without much inflammation. Conversely, in the case of immunodeficiency, a pro-inflammatory response including Th1 CD4, cytotoxic CD8, NK cells, and IFNγ release seems beneficial for M1 macrophage activation, despite the impact of inflammation on lung tissue.
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Affiliation(s)
- Eléna Charpentier
- Department of Parasitology-Mycology, Toulouse University Hospital, 31059 Toulouse, France;
- Infinity, Inserm, CNRS, University of Toulouse III, 31024 Toulouse, France; (S.M.); (C.M.)
- Correspondence: (E.C.); (X.I.)
| | - Sandie Ménard
- Infinity, Inserm, CNRS, University of Toulouse III, 31024 Toulouse, France; (S.M.); (C.M.)
| | - Catherine Marques
- Infinity, Inserm, CNRS, University of Toulouse III, 31024 Toulouse, France; (S.M.); (C.M.)
| | - Antoine Berry
- Department of Parasitology-Mycology, Toulouse University Hospital, 31059 Toulouse, France;
- Infinity, Inserm, CNRS, University of Toulouse III, 31024 Toulouse, France; (S.M.); (C.M.)
| | - Xavier Iriart
- Department of Parasitology-Mycology, Toulouse University Hospital, 31059 Toulouse, France;
- Infinity, Inserm, CNRS, University of Toulouse III, 31024 Toulouse, France; (S.M.); (C.M.)
- Correspondence: (E.C.); (X.I.)
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