title: Zika virus damages the human placental barrier and presents marked fetal neurotropism.
abstract: An unusually high incidence of microcephaly in newborns has recently been observed in Brazil. There is a temporal association between the increase in cases of microcephaly and the Zika virus (ZIKV) epidemic. Viral RNA has been detected in amniotic fluid samples, placental tissues and newborn and fetal brain tissues. However, much remains to be determined concerning the association between ZIKV infection and fetal malformations. In this study, we provide evidence of the transplacental transmission of ZIKV through the detection of viral proteins and viral RNA in placental tissue samples from expectant mothers infected at different stages of gestation. We observed chronic placentitis (TORCH type) with viral protein detection by immunohistochemistry in Hofbauer cells and some histiocytes in the intervillous spaces. We also demonstrated the neurotropism of the virus via the detection of viral proteins in glial cells and in some endothelial cells and the observation of scattered foci of microcalcifications in the brain tissues. Lesions were mainly located in the white matter. ZIKV RNA was also detected in these tissues by real-time-polymerase chain reaction. We believe that these findings will contribute to the body of knowledge of the mechanisms of ZIKV transmission, interactions between the virus and host cells and viral tropism.
authors.affiliation: Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brasil.
authors.forename: Lucia de
authors.initials: Ld
authors.lastname: Noronha
authors.affiliation: Laboratório de Virologia Molecular, Instituto Carlos Chagas, Fundação Oswaldo Cruz, Curitiba, PR, Brasil.
authors.forename: Camila
authors.initials: C
authors.lastname: Zanluca
authors.affiliation: Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brasil.
authors.forename: Marina Luize Viola
authors.initials: ML
authors.lastname: Azevedo
authors.affiliation: Instituto de Medicina Tropical, Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil.
authors.forename: Kleber Giovanni
authors.initials: KG
authors.lastname: Luz
authors.affiliation: Laboratório de Virologia Molecular, Instituto Carlos Chagas, Fundação Oswaldo Cruz, Curitiba, PR, Brasil.
authors.forename: Claudia Nunes Duarte Dos
authors.initials: CN
authors.lastname: Santos
mesh_terms: D000328:Adult; D000653:Amniotic Fluid / Q000821:virology; D001921:Brain / Q000196:embryology / Q000821:virology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007231:Infant, Newborn; D018445:Infectious Disease Transmission, Vertical; D008297:Male; D008831:Microcephaly / Q000821:virology*; D010920:Placenta / Q000821:virology; D011247:Pregnancy; D012367:RNA, Viral / Q000032:analysis; D056189:Viral Tropism / Q000502:physiology*; D000071244:Zika Virus / Q000502:physiology*; D000071243:Zika Virus Infection / Q000151:congenital*
chemical_list: D012367:RNA, Viral