SARS-CoV-2 infection during the first trimester leads to profound immune dysregulation at the maternal-fetal interface despite limited virus detection in placental tissues.
Liu XX, Shen X, Cui X, Chen X, Jin T
Maternal Immunity
Understanding how viral infections hijack cellular signaling pathways — like WNT and TGF-β, which plants also use to regulate growth — illuminates fundamental biology shared across living systems, though this study has no direct gardening relevance.
Researchers studied whether the COVID-19 virus could cross into the placenta during early pregnancy. They found the virus rarely makes it into placental tissue, likely because the cells there lack the right entry points. Even so, the immune system reacts strongly, disrupting how placental cells develop and communicate — which could still put pregnancies at risk.
Key Findings
SARS-CoV-2 was detected at low levels in placental tissues from 761 first-trimester pregnancies, with single-cell analysis showing no significant co-expression of ACE2 and TMPRSS2 entry receptors.
Maternal infection significantly elevated immune markers IL-31, IL-5, and GRO-α during acute infection, while increased IgG antibody levels were negatively correlated with TNF-β, suggesting a protective antibody effect.
Infection disrupted WNT and TGF-β signaling pathways in trophoblast cells and altered their differentiation trajectories, despite the virus being largely absent from placental tissue.
chevron_right Technical Summary
A study of 761 pregnant women found that COVID-19 rarely infects placental tissue in the first trimester, yet still triggers significant immune disruption at the maternal-fetal interface that may harm pregnancy outcomes.
Abstract Preview
The endemic nature of SARS-CoV-2 underscores the imperative to elucidate its effects on pregnancy, particularly the potential for vertical transmission and its influence on the early maternal-fetal...
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