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Isolation, Characterization, and Therapeutic Application of Extracellular Vesicles from Cultured Human Mesenchymal Stem Cells
Published on: September 23, 2022
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Epithelial stem cells are formed by small-particles released from particle-producing cells
Wuyi Kong1, Xiao Ping Zhu1, Xiu Juan Han1
1Beijing Khasar Medical Technology Co. Ltd., Beijing, China.
Plos One
|March 3, 2017
Summary
Large cells in mouse blood and bone marrow produce small particles that fuse to form new epithelial stem cells, revealing a novel mechanism for lifelong stem cell support and tissue regeneration.
Area of Science:
- Stem cell biology
- Epithelial biology
- Regenerative medicine
Background:
- Current understanding suggests epidermal stem cells divide symmetrically, raising questions about lifelong stem cell maintenance.
- The origin and self-renewal mechanisms of epithelial stem cells require further elucidation.
Purpose of the Study:
- To investigate the cellular origin and formation process of epithelial stem cells.
- To identify novel mechanisms for epithelial stem cell self-renewal and tissue regeneration.
Main Methods:
- Microscopic observation of large cells in mouse blood and bone marrow.
- Analysis of cellular clumps, small particles, and newly formed nucleated cells.
- Immunohistochemical staining for E-cadherin and Oct4.
Main Results:
- Identified large, eosin-staining cells containing coiled-tubing-like structures in mouse blood and bone marrow.
- Observed small particles (2-3 μm) that fuse to form nucleated cells, expressing E-cadherin.
- Detected particle fusion and cellularization in mouse kidney ducts post-ischemia, suggesting a role in regeneration.
- Newly formed cells expressed Oct4 and E-cadherin, indicating potential as tissue-specific epithelial stem cells.
Conclusions:
- Large particle-producing cells are identified as the origin of epithelial stem cells.
- Epithelial stem cells are newly formed through particle fusion and nuclear remodeling.
- This particle fusion mechanism offers a new perspective on epithelial stem cell maintenance and tissue repair.
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