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<article xsi:noNamespaceSchemaLocation="http://jats.nlm.nih.gov/publishing/1.1/xsd/JATS-journalpublishing1-mathml3.xsd" dtd-version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><front><journal-meta><journal-id journal-id-type="publisher-id">BMT</journal-id><journal-title-group><journal-title>Biomaterials Translational</journal-title></journal-title-group><issn>TBA</issn><eissn>2096-112X</eissn><publisher><publisher-name>Biomaterials Translational</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.12336/biomatertransl.2023.04.006</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title>Harvest of functional mesenchymal stem cells derived from in vivo osteo-organoids</title><url>https://artdesignp.com/journal/BMT/4/4/10.12336/biomatertransl.2023.04.006</url><author>DengShunshu,ZhuFuwei,DaiKai,WangJing,LiuChangsheng</author><pub-date pub-type="publication-year"><year>2023</year></pub-date><volume>4</volume><issue>4</issue><history><date date-type="pub"><published-time>2023-12-28</published-time></date></history><abstract>Bone marrow-derived mesenchymal stem cells (BM-MSCs) play a crucial role in stem cell therapy and are extensively used in regenerative medicine research. However, current methods for harvesting BM-MSCs present challenges, including a low yield of primary cells, long time of&amp;nbsp;in vitro&amp;nbsp;expansion, and diminished differentiation capability after passaging. Meanwhile mesenchymal stem cells (MSCs) recovered from cell banks also face issues like toxic effects of cryopreservation media. In this study, we provide a detailed protocol for the isolation and evaluation of MSCs derived from&amp;nbsp;in vivo&amp;nbsp;osteo-organoids, presenting an alternative to autologous MSCs. We used recombinant human bone morphogenetic protein 2-loaded gelatin sponge scaffolds to construct&amp;nbsp;in vivo&amp;nbsp;osteo-organoids, which were stable sources of MSCs with large quantity, high purity, and strong stemness. Compared with protocols using bone marrow, our protocol can obtain large numbers of high-purity MSCs in a shorter time (6 days vs. 12 days for obtaining passage 1 MSCs) while maintaining higher stemness. Notably, we found that the&amp;nbsp;in vivo&amp;nbsp;osteo-organoid-derived MSCs exhibited stronger anti-replicative senescence capacity during passage and amplification, compared to BM-MSCs. The use of osteo-organoid-derived MSCs addresses the conflict between the limitations of autologous cells and the risks associated with allogeneic sources in stem cell transplantation. Consequently, our protocol emerges as a superior alternative for both stem cell research and tissue engineering.</abstract><keywords>anti-replicative senescence ; in vivo osteo-organoid ; mesenchymal stem cell ; recombinant human bone morphogenetic protein 2 ; stem cell therapy</keywords></article-meta></front><body/><back><ref-list><ref id="B1" content-type="article"><label>1</label><element-citation publication-type="journal"><p>1. Zhu, H.; Guo, Z. K.; Jiang, X. X.; Li, H.; Wang, X. Y.; Yao, H. Y.; Zhang, Y.; Mao, N. A protocol for isolation and culture of mesenchymal stem cells from mouse compact bone. Nat Protoc. 2010, 5, 550-560.
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