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Despite intensive research, the molecular mechanisms responsible for the initiation and progression of OA remain inconclusive. In recent years experimental findings revealed elevated levels of reactive oxygen species (ROS) as a major factor contributing to the onset and progression of OA. Hence, we designed a hydrostatic pressure bioreactor system that is capable of stimulating cartilage cell cultures with elevated ROS levels. Increased ROS levels in the media did not only lead to an inhibition of glycosaminoglycans and collagen II formation but also to a reduction of already formed glycosaminoglycans and collagen II in chondrogenic mesenchymal stem cell pellet cultures. These effects were associated with the elevated activity of matrix metalloproteinases as well as the increased expression of several inflammatory cytokines. ROS activated different signaling pathways including PI3K\/Akt and MAPK\/ERK which are known to be involved in OA initiation and progression. Utilizing the presented bioreactor system, an OA <jats:italic>in vitro<\/jats:italic> model based on the generation of ROS was developed that enables the further investigation of ROS effects on cartilage degradation but can also be used as a versatile tool for anti-oxidative drug testing.<\/jats:p>","DOI":"10.1038\/s41598-018-34718-8","type":"journal-article","created":{"date-parts":[[2018,11,13]],"date-time":"2018-11-13T11:53:12Z","timestamp":1542109992000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Hydrostatic pressure-generated reactive oxygen species induce osteoarthritic conditions in cartilage pellet cultures"],"prefix":"10.1038","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8961-2801","authenticated-orcid":false,"given":"Bernhard","family":"Rieder","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna M.","family":"Weihs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adelheid","family":"Weidinger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorota","family":"Szwarc","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5175-5118","authenticated-orcid":false,"given":"Sylvia","family":"N\u00fcrnberger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1654-462X","authenticated-orcid":false,"given":"Heinz","family":"Redl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominik","family":"R\u00fcnzler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carina","family":"Huber-Gries","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas H.","family":"Teuschl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,11,19]]},"reference":[{"key":"34718_CR1","doi-asserted-by":"publisher","first-page":"15","DOI":"10.1002\/art.23177","volume":"58","author":"CG Helmick","year":"2008","unstructured":"Helmick, C. 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