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Responses to spaceflight of mouse mandibular bone and teeth
Didem Dagdeviren1, Zana Kalajzic2, Douglas J Adams3
1Division of Oral and Maxillofacial Radiology, School of Dental Medicine, USA.
Archives of Oral Biology
|June 22, 2018
Summary
Spaceflight and microgravity impact mandibular bone and incisor development in mice. Habitat design is critical for mitigating these spaceflight effects on bone and teeth.
Area of Science:
- Space Biology
- Oral Biology
- Skeletal Physiology
Background:
- Spaceflight poses unique physiological challenges, including potential effects on non-weight-bearing skeletal structures.
- Understanding the impact of microgravity on bone and tooth development is crucial for astronaut health.
Purpose of the Study:
- To investigate the effects of spaceflight and microgravity on mandibular bone and incisor development and mineralization.
- To combine organ-level and cellular-level analyses for comprehensive insights.
Main Methods:
- Mice were flown on the STS-135 space shuttle and Bion-M1 satellite missions, with ground controls.
- Micro-computed tomography and immunohistochemistry were used to analyze mandibles and incisors.
- Key proteins and osteocyte markers were assessed to evaluate bone and tooth physiology.
Main Results:
- Spaceflight altered incisor length, mineralization, and volume, with variations between missions.
- Mandibular bone volume showed mission-dependent changes, with some groups exhibiting increased and others decreased bone volume.
- Changes in specific bone and tooth proteins (dentin sialoprotein, amelogenin) and osteocyte markers (sclerostin) were observed.
Conclusions:
- Microgravity measurably affects mandibular bone physiology and incisor development.
- Habitat conditions significantly influenced bone and tooth parameters, independent of flight.
- Optimized habitat design is essential for future spaceflight missions to support skeletal health.
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