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Purification, Expansion, and Flow Cytometry-Based Phenotyping of Mouse Derived Bone Marrow Mesenchymal Stem Cells
Published on: July 11, 2025
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[Differential effects on bone and mesenchymal stem cells caused by intermittent and continuous PTH administration]
L X Zhang1, Y M Balani, Sophia Trinh
1Department of Endocrinology, Chinese PLA General Hospital, Beijing 100853, China.
Zhonghua Yi Xue Za Zhi
|March 22, 2018
Summary
Intermittent parathyroid hormone (PTH) therapy boosts bone formation by increasing mesenchymal stem cells (MSCs) and osteoblasts. Continuous PTH, however, may lead to metabolic bone disease due to fibrosis and increased osteoclasts.
Area of Science:
- Bone biology and regenerative medicine
- Endocrinology and metabolic bone diseases
- Stem cell research
Background:
- Parathyroid hormone (PTH) plays a crucial role in bone metabolism.
- Different administration methods of PTH may yield distinct therapeutic outcomes.
- Understanding the effects on mesenchymal stem cells (MSCs) is key to bone regeneration.
Purpose of the Study:
- To compare the effects of intermittent versus continuous parathyroid hormone (PTH) administration on bone and mesenchymal stem cells (MSCs).
- To evaluate the impact of PTH on bone mineral density (BMD), bone structure, and cellular components.
- To assess the reversibility of PTH effects after drug withdrawal.
Main Methods:
- Mice models (C57/BL6J, SOX9-creERT/Td-tomato/Osteocalcin-GFP) were used with three groups: intermittent PTH, continuous PTH, and control.
- Treatment involved subcutaneous injection or pump implantation of PTH for two weeks.
- Serum calcium, BMD, histopathology, and immunofluorescence analyses were conducted during treatment and after withdrawal.
Main Results:
- Both intermittent and continuous PTH transiently increased serum calcium and BMD, with no significant difference after withdrawal.
- Intermittent PTH increased bone mass, osteoblasts, and undifferentiated MSCs, with a decline post-withdrawal.
- Continuous PTH induced significant fibrosis and increased osteoclasts, potentially leading to metabolic bone disease, though lining cells increased after withdrawal.
Conclusions:
- Intermittent PTH promotes bone formation by enhancing MSCs and osteoblasts, possibly via lining cell transformation.
- Continuous PTH shows limited benefits with risks of fibrosis and osteoclast-driven bone loss, suggesting potential for metabolic bone disease.
- Lining cell increase post-withdrawal of continuous PTH may aid bone remodeling.
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