TLR7/TLR8 Activation Restores Defective Cytokine Secretion by Myeloid Dendritic Cells but Not by Plasmacytoid Dendritic Cells in HIV-Infected Pregnant Women and Newborns

Autor(es)

Cardoso, Elaine Cristina ^[1] ; Pereira, Natalli Zanete ^[1] ; Mitsunari, Gabrielle Eimi ^[1] ; da Silva Oliveira, Luanda Mara ^[1] ; Ruocco, Rosa Maria S. A. ^[2] ; Vieira Francisco, Rossana Pulcineli ^[2] ; Zugaib, Marcelo ^[2] ; da Silva Duarte, Alberto Jose ^[1] ; Sato, Maria Notomi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Med, Dept Dermatol, Lab Dermatol & Immunodeficiencies, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Sch Med, Dept Obstet & Gynecol, Hosp Clin, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 8, n. 6 JUN 27 2013.
• Citações Web of Science: 13

Resumo

Mother-to-child transmission (MTCT) of HIV-1 has been significantly reduced with the use of antiretroviral therapies, resulting in an increased number of HIV-exposed uninfected infants. The consequences of HIV infection on the innate immune system of both mother-newborn are not well understood. In this study, we analyzed peripheral blood and umbilical cord blood (CB) collected from HIV-1-infected and uninfected pregnant women. We measured TNF-alpha, IL-10 and IFN-alpha secretion after the stimulation of the cells with agonists of both extracellular Toll-like receptors (TLRs) (TLR2, TLR4 and TLR5) and intracellular TLRs (TLR7, TLR7/8 and TLR9). Moreover, as an indicator of the innate immune response, we evaluated the responsiveness of myeloid dendritic cells (mDCs) and plasmacytoid DCs (pDCs) to TLRs that are associated with the antiviral response. Our results showed that peripheral blood mononuclear cells (PBMCs) from HIV-1-infected mothers and CB were defective in TNF-alpha production after activation by TLR2, TLR5, TLR3 and TLR7. However, the TNF-alpha response was preserved after TLR7/8 (CL097) stimulation, mainly in the neonatal cells. Furthermore, only CL097 activation was able to induce IL-10 and IFN-alpha secretion in both maternal and CB cells in the infected group. An increase in IFN-alpha secretion was observed in CL097-treated CB from HIV-infected mothers compared with control mothers. The effectiveness of CL097 stimulation was confirmed by observation of similar mRNA levels of interferon regulatory factor-7 (IRF-7), IFN-alpha and TNF-alpha in PBMCs of both groups. The function of both mDCs and pDCs was markedly compromised in the HIV-infected group, and although TLR7/TLR8 activation overcame the impairment in TNF-alpha secretion by mDCs, such stimulation was unable to reverse the dysfunctional type I IFN response by pDCs in the HIV-infected samples. Our findings highlight the dysfunction of innate immunity in HIV-infected mother-newborn pairs. The activation of the TLR7/8 pathway could function as an adjuvant to improve maternal-neonatal innate immunity. (AU)

• Processo FAPESP: 08/55962-3 - Transmissão materno-fetal do vírus HIV1: efeito da sinalização via TLR7/8 na ativação de células dendríticas e no desenvolvimento da resposta T de mães infectadas por HIV-1 e de recém natos expostos e não infectados pelo vírus
• Beneficiário: Maria Notomi Sato
• Modalidade de apoio: Auxílio à Pesquisa - Regular