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To treat OA, it may be beneficial to inhibit the activity of TGF-\u03b2 in the subchondral bone. However, delivering drugs to the subchondral bone using conventional methods is challenging. In this study, we developed an extracellular vesicle delivery system. The utilization of macrophage-derived extracellular vesicles as a drug-carrying platform enables drugs to evade immune clearance and cross biological barriers. By incorporating targeting peptides on the surface of extracellular vesicles, the drug platform becomes targeted. The combination of these two factors results in the successful delivery of the drug to the subchondral bone. The study evaluated the stability, cytotoxicity, and bone targeting capability of the engineered extracellular vesicle platform (BT-EV-G). It also assessed the effects of BT-EV-G on the differentiation, proliferation, and migration of bone mesenchymal stem cells (BMSCs). Additionally, the researchers administered BT-EV-G to anterior cruciate ligament transection (ACLT)-induced OA mice. The results showed that BT-EV-G had low toxicity and high bone targeting ability both in vitro and in vivo. BT-EV-G can restore coupled bone remodeling in subchondral bone by inhibiting pSmad2\/3-dependent TGF-\u03b2 signaling. This work provides new insights into the treatment of OA.<\/jats:p>","DOI":"10.1177\/20417314241257781","type":"journal-article","created":{"date-parts":[[2024,7,25]],"date-time":"2024-07-25T02:02:04Z","timestamp":1721872924000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":20,"title":["Engineered extracellular vesicle-delivered TGF-\u03b2 inhibitor for attenuating osteoarthritis by targeting subchondral bone"],"prefix":"10.1177","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6027-2759","authenticated-orcid":false,"given":"Zhaopu","family":"Jing","sequence":"first","affiliation":[{"name":"The Second Affiliated Hospital of Xi\u2019an Jiaotong University, Xi\u2019an, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangyang","family":"Zhang","sequence":"additional","affiliation":[{"name":"The Second Affiliated Hospital of Xi\u2019an Jiaotong University, Xi\u2019an, 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