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Modulation of the immune response in HTLV-1-infections by SM29 antigen in vitro is dependent of IL-10, TGF-β and CTLA-4

The HTLV-1 is the causal agent of HTLV-1-associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP). The immune response in HTLV-1 infection is polarized to the Th1-type, and previous data from our group had demonstrated that the use of Schistosoma antigens to cell cultures in HTLV-1 infection resulted in down-modulation of Th1/inflammatory response. The aim of this study was to evaluate whether the modulation of inflammatory response by S. mansoni antigens depends upon the presence of IL-10, TGF-β and CTLA-4. The antibodies anti-IL-10, anti-TGF-β and anti-CTLA-4 with or without the S. mansoni antigen Sm29 were added to the PBMC cultures of HTLV-1- infected individuals and the levels of cytokines in the supernatants were measure using ELISA sandwich method. Compared to the levels of cytokine in non stimulated cultures (1.073 pg/ml, median values), the levels of IFN-gproduction (552 pg/ml, 1.002 pg/ml and 548 pg/ml, respectively; p<0.05). On the other hand, the levels of IL-10 were increased by the presence of Sm29 (it passed from 26 pg/ml to102 pg/ml; p=0.02), however when anti-TGF-β and anti-CTLA-4 were added to the cultures there was a reduction in the levels of IL-10 (19 pg/ml and 23 pg/ml, respectively; p<0.05). The regulation of IFN-y production by Sm29 antigen in HTLV-1-infected individuals is dependent on IL-10, TGF-β and CTLA-4. Also the levels of IL-10 were affected by the neutralization of TGF-β and CTLA-4.

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CNPQ (Universal 479417/2008 3), NIH (R01AI079238A).

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Correspondence to Maria Ilma Araújo.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver ( ) applies to the data made available in this article, unless otherwise stated.

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Lima, L.M., Santos, S.B., Oliveira, R.R. et al. Modulation of the immune response in HTLV-1-infections by SM29 antigen in vitro is dependent of IL-10, TGF-β and CTLA-4. Retrovirology 11 (Suppl 1), P68 (2014).

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