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Placenta May Help Shield Fetus From COVID-19

July 17, 2020 by Vicki Doe Leave a Comment

FRIDAY, July 17, 2020 (HealthDay News) — Some key molecules used by the new coronavirus to cause infection aren't found in the placenta, which may explain why the virus is rarely detected in fetuses or newborns of women with COVID-19.

U.S. government researchers found that placental membranes lack the messenger RNA (mRNA) molecule required to make the ACE2 receptor. SARS-CoV-2 — the virus that causes COVID-19 — uses that cell surface receptor to cause infection.

These placental tissues also lack mRNA needed to make an enzyme that SARS-CoV-2 uses to invade a cell, the U.S. National Institutes of Health (NIH) researchers found.

However, the placenta does have molecules that previous research has suggested may be potential routes for SARS-CoV-2 infection, the findings showed. Those molecules include the CD147 receptor and the enzymes cathepsin L and Furin.

The researchers also found that placental and membrane tissue have a type of immune cell (macrophage) with the critical cell surface receptor. But there's little evidence the new coronavirus could spread to the placenta, membranes and fetus in a normal pregnancy, they said in an NIH news release.

The investigators also found that the placenta contains many receptors used for infection by Zika virus and cytomegalovirus. Both pose serious health risks when passed from a pregnant woman to her fetus.

The findings were published online July 14 in the journal eLife. The study was conducted by a team led by Dr. Roberto Romero, chief of perinatology research at the U.S. National Institute of Child Health and Human Development, in Detroit.

More information

The U.S. Centers for Disease Control and Prevention offers COVID-19 advice for women who are pregnant or breastfeeding.

— Robert Preidt

SOURCE: U.S. National Institutes of Health, news release, July 14, 2020

Copyright © 2020 HealthDay. All rights reserved.

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