{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,2]],"date-time":"2026-11-02T17:06:08Z","timestamp":1793639168725,"version":"4.5.1"},"reference-count":95,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2022,7,29]],"date-time":"2022-07-29T00:00:00Z","timestamp":1659052800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000090","name":"Congressionally Directed Medical Research Programs","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000090","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000090","name":"Congressionally Directed Medical Research Programs","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000090","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006227","name":"Lawrence Livermore National Laboratory","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006227","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Immunol."],"abstract":"<jats:p>\n                    Osteoarthritis (OA) is the most common joint disease, affecting over 300 million people world-wide. Accumulating evidence attests to the important roles of the immune system in OA pathogenesis. Understanding the role of various immune cells in joint degeneration or joint repair after injury is vital for improving therapeutic strategies for treating OA. Post-traumatic osteoarthritis (PTOA) develops in ~50% of individuals who have experienced an articular trauma like an anterior cruciate ligament (ACL) rupture. Here, using the high resolution of single-cell RNA sequencing, we delineated the temporal dynamics of immune cell accumulation in the mouse knee joint after ACL rupture. Our study identified multiple immune cell types in the joint including neutrophils, monocytes, macrophages, B cells, T cells, NK cells and dendritic cells. Monocytes and macrophage populations showed the most dramatic changes after injury. Further characterization of monocytes and macrophages reveled 9 major subtypes with unique transcriptomics signatures, including a tissue resident Lyve1\n                    <jats:sup>hi<\/jats:sup>\n                    Folr2\n                    <jats:sup>hi<\/jats:sup>\n                    macrophage population and Trem2\n                    <jats:sup>hi<\/jats:sup>\n                    Fcrls\n                    <jats:sup>+<\/jats:sup>\n                    recruited macrophages, both showing enrichment for phagocytic genes and growth factors such as\n                    <jats:italic>Igf1<\/jats:italic>\n                    ,\n                    <jats:italic>Pdgfa<\/jats:italic>\n                    and\n                    <jats:italic>Pdgfc.<\/jats:italic>\n                    We also identified several genes induced or repressed after ACL injury in a cell type-specific manner. This study provides new insight into PTOA-associated changes in the immune microenvironment and highlights macrophage subtypes that may play a role in joint repair after injury.\n                  <\/jats:p>","DOI":"10.3389\/fimmu.2022.938075","type":"journal-article","created":{"date-parts":[[2022,7,29]],"date-time":"2022-07-29T08:51:40Z","timestamp":1659084700000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":115,"title":["Single-cell RNA-Seq reveals changes in immune landscape in post-traumatic osteoarthritis"],"prefix":"10.3389","volume":"13","author":[{"given":"Aimy","family":"Sebastian","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas R.","family":"Hum","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jillian 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