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However, there is no chondroprotective agent that is approved for clinical application. We showed that LOXL2 is elevated in the regenerative response during fracture healing in mice and has a critical role in chondrogenic differentiation. Indeed, LOXL2 is an anabolic effector that attenuates pro-inflammatory signaling in OA cartilage of the TMJ and knee joint, induces chondroprotective and regenerative responses, and attenuates NF-kB signaling. The specific goal of the study was to evaluate if adenoviral delivery of LOXL2 is anabolic to human and mouse TMJ condylar cartilage in vivo and evaluate the protective and anabolic effect on cartilage-specific factors. We employed two different models to assess TMJ-OA. In one model, clinical TMJ-OA cartilage from 5 different samples in TMJ-OA cartilage plugs were implanted subcutaneously in nude mice. Adenovirus LOXL2 -treated implants showed higher mRNA levels of LOXL2, ACAN, and other anabolic genes compared to the adenovirus-Empty-treated implants. Further characterization by RNA-seq analysis showed LOXL2 promotes proteoglycan networks and extracellular matrix in human TMJ-OA cartilage implants in vivo. In order to evaluate if LOXL2-induced functional and sex-linked differences, both male and female four-month-old chondrodysplasia (Cho\/+) mice, which develop progressive TMJ-OA due to a point mutation in the <jats:italic>Col11a1<\/jats:italic> gene, were subjected to intraperitoneal injection with Adv-RFP-LOXL2 every 2\u00a0weeks for 12\u00a0weeks. The data showed that adenovirus delivery of LOXL2 upregulated LOXL2 and aggrecan (<jats:italic>Acan<\/jats:italic>), whereas MMP13 expression was slightly downregulated. The fold change expression of <jats:italic>Acan<\/jats:italic> and <jats:italic>Runx2<\/jats:italic> induced by Adv-RFP-LOXL2 was higher in females compared to males. Interestingly, Adv-RFP-LOXL2 injection significantly increased <jats:italic>Rankl<\/jats:italic> expression in male but there was no change in females, whereas <jats:italic>VegfB<\/jats:italic> gene expression was increased in females, but not in males, as compared to those injected with Adv-RFP-Empty in respective groups. Our findings indicate that LOXL2 can induce specifically the expression of Acan and other anabolic genes in two preclinical models in vivo. Further, LOXL2 has beneficial functions in human TMJ-OA cartilage implants and promotes gender-specific anabolic responses in Cho\/+\u2009mice with progressive TMJ-OA, suggesting its merit for further study as an anabolic therapy for TMJ-OA.<\/jats:p>","DOI":"10.1038\/s41598-020-77178-9","type":"journal-article","created":{"date-parts":[[2020,11,19]],"date-time":"2020-11-19T11:03:51Z","timestamp":1605783831000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["LOXL2 promotes aggrecan and gender-specific anabolic differences to TMJ cartilage"],"prefix":"10.1038","volume":"10","author":[{"given":"Mustafa M.","family":"Tashkandi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saqer F.","family":"Alsaqer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thabet","family":"Alhousami","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Faiza","family":"Ali","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu-Chiao","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jennifer","family":"Shin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pushkar","family":"Mehra","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Larry M.","family":"Wolford","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Louis C.","family":"Gerstenfeld","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mary B.","family":"Goldring","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manish V.","family":"Bais","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,11,19]]},"reference":[{"key":"77178_CR1","doi-asserted-by":"publisher","first-page":"2164825","DOI":"10.1155\/2017\/2164825","volume":"2017","author":"V Ostensjo","year":"2017","unstructured":"Ostensjo, V., Moen, K., Storesund, T. & Rosen, A. 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