T cells specific to leishmania and other nonrelated microbial antigens can migrate to human leishmaniasis skin lesions

The Journal of Investigative Dermatology
Alda Maria Da-CruzSergio G Coutinho

Abstract

Immunopathological studies have contributed to the characterization of in situ inflammatory infiltrates in cutaneous leishmaniasis (CL). However, little is known about the T-cell antigen reactivity of these lesions. Our objective was to analyze the responsiveness of lymphocytes from CL lesions to leishmanial and nonrelated antigens in terms of proliferation and the production of cytokines. Mononuclear cells were extracted from lesions, and blood from CL patients infected with Leishmania (Viannia) braziliensis. Activated cells accounted for 35-45% of lesions T-cell subsets. Elevated levels of C1.7/CD244(+)CD8(+) T cells suggest in situ cytotoxic effector function. Lymphocytes isolated from the leishmaniasis lesions proliferated and produced IFN-gamma in response to leishmanial antigens as well as to irrelevant antigens such as Toxoplasma gondii (Tg). Patients presenting with larger lesions had the highest lymphocyte proliferation indexes. A high frequency of Tg-specific cells was detected in the lesions by limiting dilution assay, similar to the frequency of Leishmania-specific cells. Importantly, Tg-reactive cells were not found in lesions of patients without a history of toxoplasmosis. The proportion of Leishmania-reactive CD4...Continue Reading

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Citations

Jul 6, 2012·The American Journal of Tropical Medicine and Hygiene·Mohammad H AlimohammadianFarrokh Modabber
Mar 25, 2015·Seminars in Immunopathology·Fernanda O Novais, Phillip Scott
Oct 18, 2014·Frontiers in Public Health·Claire da Silva Santos, Cláudia Ida Brodskyn
Jul 19, 2016·Nature Reviews. Immunology·Phillip Scott, Fernanda O Novais
Mar 2, 2018·PLoS Neglected Tropical Diseases·Dalila Y MartínezMarleen Boelaert
Nov 10, 2020·Aging Cell·Luciana P CovreArne N Akbar
Apr 13, 2021·Frontiers in Immunology·Fernanda O NovaisPhillip Scott
Mar 17, 2021·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Tainã LagoEdgar M Carvalho

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