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Immunologic patterns associated with cure in human American cutaneous leishmaniasis
S G Coutinho1, A M Da-Cruz, A L Bertho
1Laboratório de Imunidade Celular e Humoral, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brasil. coutinho@gene.dbbm.fiocruz.br
Summary
Investigating American cutaneous leishmaniasis, this study found distinct T cell responses. Healed lesions show a beneficial pattern with CD4+ and CD8+ T cells producing gamma interferon (IFN-gamma).
Area of Science:
- Immunology
- Infectious Diseases
- Parasitology
Background:
- American cutaneous leishmaniasis is a parasitic disease with variable clinical outcomes.
- Understanding the host immune response is crucial for developing effective treatments.
- T cell subsets and cytokine profiles play a significant role in leishmaniasis pathogenesis.
Purpose of the Study:
- To characterize T cell proliferative responses and cytokine production in patients with American cutaneous leishmaniasis.
- To compare immune responses during active disease versus healed lesions.
- To identify immune correlates associated with disease resolution.
Main Methods:
- Peripheral blood mononuclear cells (PBMCs) from patients were stimulated in vitro with Leishmania braziliensis antigens.
- Lymphocyte proliferation assays were performed.
- CD4 and CD8 T cell phenotypes were analyzed.
- Cytokine levels (IFN-gamma and IL-4) in culture supernatants were measured using specific assays.
Main Results:
- During active disease, a predominance of CD4+ T cells responded, producing a mixed pattern of Type 1 (IFN-gamma) and Type 2 (IL-4) cytokines.
- In healed lesions, similar proportions of CD4+ and CD8+ T cells responded.
- Healed lesions were associated with Type 1 cytokine production (IFN-gamma) and minimal IL-4.
Conclusions:
- The T cell response shifts during the course of American cutaneous leishmaniasis.
- A Type 1 immune response involving both CD4+ and CD8+ T cells correlates with successful healing.
- This pattern suggests a beneficial role for cell-mediated immunity in resolving cutaneous leishmaniasis.