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Restriction of SARS-CoV-2 replication in the human placenta
Kazuhide Takada1, Sayaka Shimodai-Yamada2, Mayumi Suzuki2
1Division of Microbiology, Department of Pathology and Microbiology, Nihon University School of Medicine, Japan.
Placenta
|August 16, 2022
Summary
The placenta rarely transmits SARS-CoV-2 to the fetus, acting as a barrier. This study provides evidence of inefficient viral replication within placental tissue, suggesting a protective mechanism against SARS-CoV-2 infection.
Area of Science:
- Virology
- Immunology
- Obstetrics
Background:
- Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) can infect placental cells.
- Vertical transmission of SARS-CoV-2 from mother to fetus is infrequent.
- The placenta's role as a barrier against fetal SARS-CoV-2 infection is not fully understood.
Purpose of the Study:
- To investigate the mechanisms by which the placenta may inhibit SARS-CoV-2 transmission to the fetus.
- To confirm the presence and replication of SARS-CoV-2 in human placental tissue.
Main Methods:
- In situ hybridization using antisense probes targeting the SARS-CoV-2 spike protein.
- Comparison of staining intensity with sense probes for the spike protein.
Main Results:
- SARS-CoV-2 genome was detected in human placental tissue.
- Significantly lower tissue staining observed with sense probes compared to antisense probes.
- This indicates inefficient viral replication in SARS-CoV-2-infected placental tissue.
Conclusions:
- The placenta demonstrates inefficient SARS-CoV-2 replication, suggesting it acts as a barrier to vertical transmission.
- Further research is needed to elucidate the precise mechanisms of placental protection against SARS-CoV-2.
