title: Murine model of chronic L. (Viannia) panamensis infection: role of IL-13 in disease.
abstract: Leishmania (Viannia) organisms are the most prevalent etiologic agents of human cutaneous leishmaniasis in the Americas. Nevertheless, our knowledge of the immunological mechanisms exploited by L. (Viannia) organisms remains limited and the mechanisms underlying disease are not well understood. Here, we report the development of a BALB/c mouse model of L. (V.) panamensis infection that is able to reproduce chronic disease, with persistent infection and clinically evident lesions for over 1 year. The immune response of the mouse resembles that found for L. (V.) panamensis-infected patients with chronic and recurrent lesions, presenting a mixed Th1/Th2 response with the presence of TNF-α, IFN-γ, IL-10 and IL-13. Using immunodeficient mice, the critical role for IL-13 and/or IL-4Rα in determining susceptibility to chronic infection was evident. With the induction of healing in the immunodeficient mice, increases in IFN-γ and IL-17 were found, concomitant with parasite control and elimination. Specifically, increases in CD4(+) (but not CD8(+)) T cells producing IFN-γ were observed. These results suggest that IL-13 represents an important target for disease control of L. (V.) panamensis infection. This murine model should be useful to further understand the pathology associated with chronic disease and to develop methods for the treatment and prevention of leishmaniasis caused by L. (Viannia) parasites.
authors.affiliation: Yale University School of Public Health, New Haven, CT 06520-8034, USA.
authors.forename: Tiago M
authors.initials: TM
authors.lastname: Castilho
authors.forename: Karen
authors.initials: K
authors.lastname: Goldsmith-Pestana
authors.forename: Caterin
authors.initials: C
authors.lastname: Lozano
authors.forename: Liliana
authors.initials: L
authors.lastname: Valderrama
authors.forename: Nancy G
authors.initials: NG
authors.lastname: Saravia
authors.forename: Diane
authors.initials: D
authors.lastname: McMahon-Pratt
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D002908:Chronic Disease; D004195:Disease Models, Animal; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology; D018793:Interleukin-13 / Q000276:immunology; D007891:Leishmania / Q000276:immunology*; D016773:Leishmaniasis, Cutaneous / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D008875:Middle Aged; D019948:Receptors, Interleukin-4 / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology; D055815:Young Adult
chemical_list: D018793:Interleukin-13; D019948:Receptors, Interleukin-4; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma
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