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Oser L, Midha A, Schlosser-Brandenburg J, Rausch S, Mugo RM, Kundik A, Elizalde-Velázquez LE, Adjah J, Musimbi ZD, Klopfleisch R, Helm CS, von Samson-Himmelstjerna G, Hartmann S, Ebner F. Ascaris suum infection in juvenile pigs elicits a local Th2 response in a setting of ongoing Th1 expansion. Front Immunol 2024; 15:1396446. [PMID: 38799456 PMCID: PMC11116563 DOI: 10.3389/fimmu.2024.1396446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 04/08/2024] [Indexed: 05/29/2024] Open
Abstract
Ascaris spp. undergo extensive migration within the body before establishing patent infections in the small intestinal tract of humans and pigs. However, whether larval migration is critical for inducing efficient type 2 responses remains poorly understood. Therefore, we investigated systemic versus local adaptive immune responses along the hepato-tracheal migration of Ascaris suum during primary, single infections in conventionally raised pigs. Neither the initial invasion of gut tissue nor migration through the liver resulted in discernable Th2 cell responses. In contrast, lung-stage larvae elicited a Th2-biased pulmonary response, which declined after the larvae had left the lungs. In the small intestine, we observed an accumulation of Th2 cells upon the arrival of fourth-stage larvae (L4) to the small intestinal lumen. In parallel, we noticed robust and increasing Th1 responses in circulation, migration-affected organs, and draining lymph nodes. Phenotypic analysis of CD4+ T cells specifically recognizing A. suum antigens in the circulation and lung tissue of infected pigs confirmed that the majority of Ascaris-specific T cells produced IL-4 (Th2) and, to a much lesser extent, IL-4/IFN-g (Th2/1 hybrids) or IFN-g alone (Th1). These data demonstrate that lung-stage but not the early liver-stage larvae lead to a locally restricted Th2 response. Significant Th2 cell accumulation in the small intestine occurs only when L4 complete the body migration. In addition, Th2 immunity seems to be hampered by the concurrent, nonspecific Th1 bias in growing pigs. Together, the late onset of Th2 immunity at the site of infection and the Th1-biased systemic immunity likely enable the establishment of intestinal infections by sufficiently large L4 stages and pre-adult worms, some of which resist expulsion mechanisms.
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Affiliation(s)
- Larissa Oser
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Ankur Midha
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Josephine Schlosser-Brandenburg
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Sebastian Rausch
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Robert M. Mugo
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Arkadi Kundik
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Luis E. Elizalde-Velázquez
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Joshua Adjah
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Zaneta D. Musimbi
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Robert Klopfleisch
- Department of Veterinary Medicine, Institute of Veterinary Pathology, Freie Universität Berlin, Berlin, Germany
| | - Christina S. Helm
- Department of Veterinary Medicine, Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Georg von Samson-Himmelstjerna
- Department of Veterinary Medicine, Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Susanne Hartmann
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
| | - Friederike Ebner
- Centre for Infection Medicine, Department of Veterinary Medicine, Institute of Immunology, Freie Universität Berlin, Berlin, Germany
- Infection Pathogenesis, School of Life Sciences, Technical University of Munich, Freising, Germany
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Hussain T, Nguyen A, Daunt C, Thiele D, Pang ES, Li J, Zaini A, O'Keeffe M, Zaph C, Harris NL, Quinn KM, La Gruta NL. Helminth Infection-Induced Increase in Virtual Memory CD8 T Cells Is Transient, Driven by IL-15, and Absent in Aged Mice. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 210:297-309. [PMID: 36524995 DOI: 10.4049/jimmunol.2200316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 11/28/2022] [Indexed: 01/04/2023]
Abstract
CD8 virtual memory T (TVM) cells are Ag-naive CD8 T cells that have undergone partial differentiation in response to common γ-chain cytokines, particularly IL-15 and IL-4. TVM cells from young individuals are highly proliferative in response to TCR and cytokine stimulation but, with age, they lose TCR-mediated proliferative capacity and exhibit hallmarks of senescence. Helminth infection can drive an increase in TVM cells, which is associated with improved pathogen clearance during subsequent infectious challenge in young mice. Given the cytokine-dependent profile of TVM cells and their age-associated dysfunction, we traced proliferative and functional changes in TVM cells, compared with true naive CD8 T cells, after helminth infection of young and aged C57BL/6 mice. We show that IL-15 is essential for the helminth-induced increase in TVM cells, which is driven only by proliferation of existing TVM cells, with negligible contribution from true naive cell differentiation. Additionally, TVM cells showed the greatest proliferation in response to helminth infection and IL-15 compared with other CD8 T cells. Furthermore, TVM cells from aged mice did not undergo expansion after helminth infection due to both TVM cell-intrinsic and -extrinsic changes associated with aging.
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Affiliation(s)
- Tabinda Hussain
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Angela Nguyen
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Carmel Daunt
- Laboratory of Intestinal Immunology, Department of Immunology and Pathology, Central Clinical School, The Alfred Centre, Monash University, Melbourne, Victoria, Australia
| | - Daniel Thiele
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Ee Shan Pang
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Jasmine Li
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia.,Cancer Immunology Program, Peter MacCallum Cancer Centre, Parkville, Victoria, Australia; and
| | - Aidil Zaini
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Meredith O'Keeffe
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Colby Zaph
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Nicola L Harris
- Laboratory of Intestinal Immunology, Department of Immunology and Pathology, Central Clinical School, The Alfred Centre, Monash University, Melbourne, Victoria, Australia
| | - Kylie M Quinn
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia.,School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria, Australia
| | - Nicole L La Gruta
- Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
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