Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effect of severe acute respiratory syndrome coronavirus 2 infection during pregnancy in K18-hACE2 transgenic mice

  • Byeongseok, Kim (Department of Stem Cell and Regenerative Biotechnology, Konkuk University) ;
  • Ki Hoon, Park (Department of Research and Development, KR BIOTECH CO., Ltd.) ;
  • Ok-Hee, Lee (Department of Veterinary Physiology, College of Veterinary Medicine, Konkuk University) ;
  • Giwan, Lee (Department of Stem Cell and Regenerative Biotechnology, Konkuk University) ;
  • Hyukjung, Kim (Department of Stem Cell and Regenerative Biotechnology, Konkuk University) ;
  • Siyoung, Lee (Department of Stem Cell and Regenerative Biotechnology, Konkuk University) ;
  • Semi, Hwang (Department of Stem Cell and Regenerative Biotechnology, Konkuk University) ;
  • Young Bong, Kim (Department of Biomedical Science and Engineering, Konkuk University) ;
  • Youngsok, Choi (Department of Stem Cell and Regenerative Biotechnology, Konkuk University)
  • Received : 2022.04.08
  • Accepted : 2022.08.06
  • Published : 2023.01.01
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Abstract

Objective: This study aimed to examine the influence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection on pregnancy in cytokeratin-18 (K18)-hACE2 transgenic mice. Methods: To determine the expression of hACE2 mRNA in the female reproductive tract of K18-hACE2 mice, real-time polymerase chain reaction (RT-PCR) was performed using the ovary, oviduct, uterus, umbilical cord, and placenta. SARS-CoV-2 was inoculated intranasally (30 μL/mouse, 1×104 TCID50/mL) to plug-checked K18-hACE2 homozygous female mice at the pre-and post-implantation stages at 2.5 days post-coitum (dpc) and 15.5 dpc, respectively. The number of implantation sites was checked at 7.5 dpc, and the number of normally born pups was investigated at 20.5 dpc. Pregnancy outcomes, including implantation and childbirth, were confirmed by comparison with the non-infected group. Tissues of infected mice were collected at 7.5 dpc and 19.5 dpc to confirm the SARS-CoV-2 infection. The infection was identified by performing RT-PCR on the infected tissues and comparing them to the non-infected tissues. Results: hACE2 mRNA expression was confirmed in the female reproductive tract of the K18-hACE2 mice. Compared to the non-infected group, no significant difference in the number of implantation sites or normally born pups was found in the infected group. SARS-CoV-2 infection was detected in the lungs but not in the female reproductive system of infected K18-hACE2 mice. Conclusion: In K18-hACE2 mice, intranasal infection with SARS-CoV-2 did not induce implantation failure, preterm labor, or miscarriage. Although the viral infection was not detected in the uterus, placenta, or fetus, the infection of the lungs could induce problems in the reproductive system. However, lung infections were not related to pregnancy outcomes.

Keywords

Acknowledgement

We would like to thank Editage (www.editage.co.kr) for English language editing.

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