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Osteoclast-mediated bone loss observed in a COVID-19 mouse model
Olatundun D Awosanya1, Christopher E Dalloul1, Rachel J Blosser1
1Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, United States.
Bone
|October 4, 2021
Summary
SARS-CoV-2 infection significantly impacts bone health, causing decreased bone volume and increased osteoclast activity in surviving mice. This research highlights a critical knowledge gap in understanding COVID-19
Area of Science:
- Immunology
- Virology
- Orthopedics
Background:
- The musculoskeletal consequences of SARS-CoV-2 infection are not well understood.
- Aging populations are at higher risk for severe SARS-CoV-2 outcomes.
- Understanding these effects is crucial for developing clinical strategies.
Purpose of the Study:
- To investigate the impact of SARS-CoV-2 infection on bone parameters in a mouse model.
- To assess the relationship between viral load and skeletal changes.
- To evaluate changes in bone remodeling markers post-infection.
Main Methods:
- K18-hACE2 transgenic mice and wild-type (WT) mice were infected with varying SARS-CoV-2 viral loads.
- Animal health was monitored daily using established scoring criteria.
- Femurs were analyzed using micro-computed tomography (μCT) and Tartrate-resistant acid phosphatase (TRAP) staining.
Main Results:
- SARS-CoV-2 infection led to significant decreases in trabecular bone volume fraction, number, and thickness in surviving transgenic mice.
- A notable increase in osteoclast number, surface, and density was observed in infected mice.
- No significant changes in bone parameters were detected in WT mice or cortical bone.
Conclusions:
- SARS-CoV-2 infection causes significant detrimental effects on trabecular bone structure in surviving mice.
- Increased osteoclast activity is a key feature of SARS-CoV-2-induced skeletal changes.
- Further research is needed to determine the long-term skeletal health implications of COVID-19.
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