{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T06:56:53Z","timestamp":1790751413594,"version":"4.1.0"},"reference-count":50,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T00:00:00Z","timestamp":1790726400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004829","name":"Science and Technology Department of Sichuan Province","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004829","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100018542","name":"Natural Science Foundation of Sichuan Province","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100018542","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell Dev. Biol."],"abstract":"<jats:p>\n                    Discoid lateral meniscus (DLM) is susceptible to tearing and degeneration, but the molecular basis of its altered extracellular matrix (ECM) remains unclear. We integrated histology, electron microscopy, transcriptomics, quantitative proteomics, and donor-derived cell and spheroid models to investigate the association between thrombospondin-1 (THBS1) and matrix organization in symptomatic DLM. Compared with traumatic morphologically normal lateral meniscus (NLM), DLM tissue contained fewer cells per analyzed image (mean difference, \u221216.10; 95% confidence interval (CI), \u221223.49 to \u22128.71; P &amp;lt; 0.0001); lower type-I and II collagen signals; and thinner, less dense, and less organized collagen fibrils. Cross-omics analysis nominated THBS1 and ECM-receptor interaction, and independent assays confirmed a 6.67-fold lower THBS1 protein abundance in DLM (95% CI, 5.04 to 8.27; P &amp;lt; 0.0001). In donor-derived models, THBS1 knockdown in NLM cells reduced area-confluence trajectories, increased migration, and decreased collagen-rich matrix in 4-week spheroids, whereas THBS1 overexpression in DLM cells produced reciprocal changes; aggrecan was not consistently altered. These data associate reduced THBS1 with altered collagen-rich matrix organization and support a functional contribution\n                    <jats:italic>in vitro<\/jats:italic>\n                    . The cross-sectional clinical comparison does not establish chronology, and the spheroid experiments do not demonstrate a fibrillogenesis-specific mechanism.\n                  <\/jats:p>","DOI":"10.3389\/fcell.2026.1958871","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T06:06:26Z","timestamp":1790748386000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Reduced thrombospondin-1 is associated with altered collagen-rich matrix organization in discoid lateral meniscus"],"prefix":"10.3389","volume":"14","author":[{"given":"Shunjie","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Radiology, Huaxi MR Research Center, Institute of Radiology and Medical Imaging, West China Hospital, Sichuan University","place":["Chengdu, China"]},{"name":"Sports Medicine Center, West China Hospital, Sichuan University","place":["Chengdu, China"]},{"name":"Department of Orthopedics and Orthopedic Research Institute, West China Hospital, Sichuan University","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Hou","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology and Laboratory of Macular Disease, West China Hospital, Sichuan University","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Wang","sequence":"additional","affiliation":[{"name":"Sports Medicine Center, West China Hospital, Sichuan University","place":["Chengdu, China"]},{"name":"The Academy of Chinese Health Risks of West China Hospital, Sichuan University","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, West China Hospital, Sichuan University\/West China School of Nursing","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Li","sequence":"additional","affiliation":[{"name":"Sports Medicine Center, West China Hospital, Sichuan University","place":["Chengdu, China"]},{"name":"Department of Orthopedics and Orthopedic Research Institute, West China Hospital, Sichuan University","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Naihong","family":"Yan","sequence":"additional","affiliation":[{"name":"Research Laboratory of Ophthalmology, West China Hospital, Sichuan University","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaohe","family":"Tian","sequence":"additional","affiliation":[{"name":"Department of Radiology, Huaxi MR Research Center, Institute of Radiology and Medical Imaging, West China Hospital, Sichuan University","place":["Chengdu, China"]},{"name":"The Xiamen Key Laboratory of Psychoradiology and Neuromodulation, West China Xiamen Hospital of Sichuan University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gang","family":"Chen","sequence":"additional","affiliation":[{"name":"Sports Medicine Center, West China Hospital, Sichuan University","place":["Chengdu, China"]},{"name":"Department of Orthopedics and Orthopedic Research Institute, West China Hospital, Sichuan University","place":["Chengdu, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,30]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"136","DOI":"10.1111\/iep.12517","article-title":"Thrombospondins: conserved mediators and modulators of metazoan extracellular matrix","volume":"105","author":"Adams","year":"2024","journal-title":"Int. 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