Inflammatory Responses in the Placenta upon SARS-CoV-2 Infection Late in Pregnancy. Academic Article uri icon

Overview

abstract

  • The effect of SARS-CoV-2 infection on placental function is not well understood. Analysis of placentas from women who tested positive at delivery showed SARS-CoV-2 genomic and subgenomic RNA in 22 out of 52 placentas. Placentas from two mothers with symptomatic COVID-19 whose pregnancies resulted in adverse outcomes for the fetuses contained high levels of viral Alpha variant RNA. The RNA was localized to the trophoblasts that cover the fetal chorionic villi that are in direct contact with maternal blood. The intervillous spaces and villi were infiltrated with maternal macrophages and T cells. Transcriptome analysis showed increased expression of chemokines and pathways associated with viral infection and inflammation. Infection of placental cultures with live SARS-CoV-2 and spike protein-pseudotyped lentivirus showed infection of syncytiotrophoblast and, in rare cases, endothelial cells mediated by ACE2 and Neuropilin-1. Viruses with Alpha, Beta and Delta variant spikes infected the placental cultures at significantly greater levels.

publication date

  • April 11, 2022

Identity

PubMed Central ID

  • PMC8996470

Digital Object Identifier (DOI)

  • 10.1016/j.isci.2022.104223

PubMed ID

  • 35434541