Mouse coronavirus hastened bone loss in osteoporotic mice
In an experiment in female mice, infection accelerated bone breakdown at five days in animals with osteoporosis; mice without osteoporosis showed bone loss at 60 days.
Limit: Bone strength and fractures were not reported alongside bone loss
Edited by Boris Djordjevic · AgingResearch.News
In an animal experiment, female C57BL/6 mice underwent ovary removal to induce osteoporosis, a disease that weakens bones, or a comparison surgery. Researchers infected the mice through the nose with MHV-A59, a mouse coronavirus, 14 days after surgery, after osteoporosis had developed in the ovary-removal group.
Infection accelerated bone breakdown in mice with osteoporosis five days after infection. In mice without osteoporosis, infection caused bone loss at 60 days. These changes were associated with increased development and activity of osteoclasts, cells that break down bone, and higher levels of molecules involved in inflammation and bone regulation. The authors identified enhanced osteoclast activity as a potential mechanism for infection-related bone loss when estrogen levels are low.
Why it matters
Osteoporosis is an age-related disease, and this work addresses how low estrogen may shape the effects of infection on bone.
Caveats
This experiment used surgically induced osteoporosis and a mouse coronavirus, not human coronavirus infection. The preprint has not been peer-reviewed.
The paper
CORONAVIRUS INFECTION ACCELERATES EXPERIMENTAL OSTEOPOROSIS THROUGH THE ACTIVATION OF OSTEOCLASTS
Universidade Federal de Minas Gerais
bioRxiv, Oct 30, 2026, Open access, Preprint, not peer-reviewed
