Analysis of lymphocytes in patients with Plasmodium vivax malaria and its relation to the annexin-A1 and IL-10

Malaria Journal

Research

Quessi I Borges¹  Amílcar S Damazo²  Cor JF Fontes³ 

[1] Post-graduation in Health Science, Faculty of Medicine (FM), Federal University of Mato Grosso (UFMT), 78060-900, Cuiabá, Mato Grosso, Brazil;Post-graduation in Health Science, Faculty of Medicine (FM), Federal University of Mato Grosso (UFMT), 78060-900, Cuiabá, Mato Grosso, Brazil;Department of Basic Science in Health, Faculty of Medicine (FM), Federal University of Mato Grosso (UFMT), 78060-900, Cuiabá, Mato Grosso, Brazil;Post-graduation in Health Science, Faculty of Medicine (FM), Federal University of Mato Grosso (UFMT), 78060-900, Cuiabá, Mato Grosso, Brazil;Department of Clinical Medicine, Centre of Infectious Diseases and Tropical Diseases Research of Mato Grosso, Júlio Müller Hospital, 78048-902, Cuiabá, Mato Grosso, Brazil;

关键词: Plasmodium vivax;    Annexin-A1;    Interleukin-10 (IL-10);    CD4+;    CD8+;    Treg;   

DOI  :  10.1186/1475-2875-12-455

 received in 2013-04-18, accepted in 2013-11-22,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundMalaria is the most prevalent parasitic disease in the world. In Brazil, the largest number of malaria cases (98%) is within the Legal Amazon region, where Plasmodium vivax is responsible for over 80% of diagnosed cases. The aim of this study was to investigate the annexin-A1 expression in CD4+, CD8+ T cells, regulatory T cells (Treg) and cytokine IL-10 quantification in plasma from patients with malaria caused by P. vivax.MethodsThe quantification of the cytokine IL-10 of patients infected with P. vivax and healthy controls were evaluated by enzyme-linked immunosorbent assay (ELISA). The determination of the expression of annexin-A1 in lymphocytes from patients and healthy controls was determined by immunofluorescence staining. All results were correlated with the parasitaemia and the number of previous episodes of malaria.ResultsThe cytokine IL-10 plasma levels showed a significant increase in both patients with low (650.4 ± 59.3 pg/mL) and high (2870 ± 185.3 pg/mL) parasitaemia compared to the control (326.1 ± 40.1 pg/mL). In addition, there was an increase of this cytokine in an episode dependent manner (individuals with no previous episodes of malaria - primoinfected: 363.9 ± 31.1 pg/mL; individuals with prior exposure: 659.9 ± 49.4 pg/mL). The quantification of annexin-A1 expression indicated a decrease in CD4+ and CD8+ T cells and an increase in Treg in comparison with the control group. When annexin-A1 expression was compared according to the number of previous episodes of malaria, patients who have been exposed more than once to the parasite was found to have higher levels of CD4+ T cells (96.0 ± 2.5 A.U) compared to primoinfected (50.3 ± 1.7). However, this endogenous protein had higher levels in CD8+ (108.5 ± 3.1) and Treg (87.5 ± 2.5) from patients primoinfected.ConclusionThis study demonstrates that in the patients infected with P. vivax the release of immunoregulatory molecules can be influenced by the parasitaemia level and the number of previous episodes of malaria. annexin-A1 is expressed differently in lymphocyte sub-populations and may have a role in cell proliferation. Furthermore, annexin-A1 may be contributing to IL-10 release in plasma of patients with vivax malaria.

【 授权许可】

Unknown   
© Borges et al.; licensee BioMed Central Ltd. 2013. This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.