Toxoplasma gondii Infection Induces Suppression in a Mouse Model of Allergic Airway Inflammation
| Autor: | Valentina Martin, Mariana Argenziano, Romina Chiurazzi, Ignacio Martín Fenoy, Mariano Sergio Picchio, Vanesa Roxana Sánchez, Ariadna Soledad Soto, Alejandra Goldman |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Allergy
Mouse Protozoology medicine.disease_cause Bronchoalveolar Lavage Toxoplasma Gondii Mice Allergen Transforming Growth Factor beta Interferon gamma Immune Response Mice Knockout Mice Inbred BALB C Mice Inbred C3H Multidisciplinary biology T Cells Allergy and Hypersensitivity FOXP3 Forkhead Transcription Factors Animal Models medicine.anatomical_structure CD4 Antigens Medicine medicine.symptom Toxoplasma Toxoplasmosis Research Article medicine.drug Science Immune Cells T cell Immunology Inflammation Microbiology Immunomodulation Interferon-gamma Model Organisms Th2 Cells Immune system Hypersensitivity Respiratory Hypersensitivity medicine Animals Biology Toxoplasma gondii Immunologic Subspecialties biology.organism_classification medicine.disease Asthma Parastic Protozoans Lymph Nodes Pulmonary Immunology |
| Zdroj: | PLoS ONE PLoS ONE, Vol 7, Iss 8, p e43420 (2012) |
| ISSN: | 1932-6203 |
| Popis: | Allergic asthma is an inflammatory disorder characterized by infiltration of the airway wall with inflammatory cells driven mostly by activation of Th2-lymphocytes, eosinophils and mast cells. There is a link between increased allergy and a reduction of some infections in Western countries. Epidemiological data also show that respiratory allergy is less frequent in people exposed to orofecal and foodborne microbes such as Toxoplasma gondii. We previously showed that both acute and chronic parasite T. gondii infection substantially blocked development of airway inflammation in adult BALB/c mice. Based on the high levels of IFN-γ along with the reduction of Th2 phenotype, we hypothesized that the protective effect might be related to the strong Th1 immune response elicited against the parasite. However, other mechanisms could also be implicated. The possibility that regulatory T cells inhibit allergic diseases has received growing support from both animal and human studies. Here we investigated the cellular mechanisms involved in T. gondii induced protection against allergy. Our results show for the first time that thoracic lymph node cells from mice sensitized during chronic T. gondii infection have suppressor activity. Suppression was detected both in vitro, on allergen specific T cell proliferation and in vivo, on allergic lung inflammation after adoptive transference from infected/sensitized mice to previously sensitized animals. This ability was found to be contact-independent and correlated with high levels of TGF-β and CD4(+)FoxP3(+) cells. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|