Blood CD14+ monocytes are frontline immunomodulators categorized into classical, intermediate or non-classical subsets, and subsequently differentiated into M1 pro- or M2 anti-inflammatory macrophages on stimulation. Although the Zika virus (ZIKV) rapidly establishes viraemia, the target cells and immune responses, particularly during pregnancy, remain elusive. Furthermore, it is unknown whether African- and Asian-lineage ZIKV have different phenotypic impacts on host immune responses. Using human blood infection, we identified CD14+ monocytes as the primary target for African- or Asian-lineage ZIKV infection. When immunoprofiles of human blood infected with ZIKV were compared, a classical/intermediate monocyte-mediated M1-skewed inflammation by the African-lineage ZIKV infection was observed, in contrast to a non-classical monocyte-mediated M2-skewed immunosuppression by the Asian-lineage ZIKV infection. Importantly, infection of the blood of pregnant women revealed an enhanced susceptibility to ZIKV infection. Specifically, Asian-lineage ZIKV infection of pregnant women’s blood led to an exacerbated M2-skewed immunosuppression of non-classical monocytes in conjunction with a global suppression of type I interferon-signalling pathway and an aberrant expression of host genes associated with pregnancy complications. Also, 30 ZIKV+ sera from symptomatic pregnant patients showed elevated levels of M2-skewed immunosuppressive cytokines and pregnancy-complication-associated fibronectin-1. This study demonstrates the differential immunomodulatory responses of blood monocytes, particularly during pregnancy, on infection with different lineages of ZIKV.
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We thank M. Diamond and C. Baronti for providing the ZIKV H/PF/2013 strain, and all the healthy volunteers for blood donations. This work was partly supported by CA200422, CA180779, DE023926, AI073099, AI116585, Hastings Foundation and Fletcher Jones Foundation (J.U.J.), MH106806 (A.B.) and 2T90DE021982-06 (J.W.B.), AI28697 and 1R21AI129534-01 from the National Institute of Allergy and Infectious Diseases/National Institutes of Health (K.N.S.), and CAPES/ 88887.116627/2016-01 from Departamento de Ciência e Tecnologia (DECIT) do Ministério da Saúde do Brasil and Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (P.B.).
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Medical Microbiology and Immunology (2019)
Nature Microbiology (2017)