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The Role of CD4 and CD8 T Cells in Human Cutaneous Leishmaniasis
Claire da Silva Santos1, Cláudia Ida Brodskyn2
1Centro de Pesquisas Gonçalo Moniz, Fundação Oswaldo Cruz (Fiocruz) Bahia , Salvador , Brazil.
Insights
Leishmaniasis pathogenesis involves adaptive immunity, with CD4 T cells aiding parasite control but potentially causing lesions, while CD8 T cells contribute to tissue damage. This review explores these roles in tegumentary leishmaniasis.
Area of Science:
- Immunology
- Parasitology
- Dermatology
Background:
- Leishmaniasis affects millions globally, presenting diverse skin manifestations.
- Control of Leishmania infection relies on cellular immunity, particularly T lymphocytes.
- Both CD4 and CD8 T cells have distinct, crucial roles in leishmaniasis outcomes.
Purpose of the Study:
- To review recent advances in understanding the human adaptive immune response in tegumentary leishmaniasis pathogenesis.
- To elucidate the specific contributions of CD4 and CD8 T lymphocytes to disease development and tissue damage.
Main Methods:
- Review of current literature on adaptive immunity in tegumentary leishmaniasis.
- Analysis of studies focusing on CD4 and CD8 T cell functions in disease pathogenesis.
Main Results:
- CD4 T cells are vital for controlling Leishmania parasites but may exacerbate lesion development through inflammation.
- CD8 T lymphocytes are implicated in causing tissue damage via cytotoxic mechanisms.
- The interplay between different T cell subsets significantly influences disease severity and clinical presentation.
Conclusions:
- Adaptive immunity, especially T cell responses, is central to leishmaniasis pathogenesis.
- Understanding the differential roles of CD4 and CD8 T cells is critical for developing targeted therapies for tegumentary leishmaniasis.
Abstract:
Leishmaniasis, caused by infection with parasites of the Leishmania genus, affects millions of individuals worldwide. This disease displays distinct clinical manifestations ranging from self-healing skin lesions to severe tissue damage. The control of Leishmania infection is dependent on cellular immune mechanisms, and evidence has shown that CD4 and CD8 T lymphocytes play different roles in the outcome of leishmaniasis. Although the presence of CD4 T cells is important for controlling parasite growth, the results in the literature suggest that the inflammatory response elicited by these cells could contribute to the pathogenesis of lesions. However, recent studies on CD8 T lymphocytes show that these cells are mainly involved in tissue damage through cytotoxic mechanisms. In this review, we focus on the recent advances in the study of the human adaptive immunological response in the pathogenesis of tegumentary leishmaniasis.
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