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Little is known about the initiation of dysbiosis. It was hypothesized that some commensal bacteria suppress the outgrowth of pathobionts by H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> production. However, serum and blood components released due to inflammation can neutralize this suppressive effect, leading to the initiation of dysbiosis. Agar plate, dual-species and multi-species ecology experiments showed that H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> production by commensal bacteria decreases pathobiont growth and colonization. Peroxidase and blood components neutralize this inhibitory effect primarily by an exogenous peroxidase activity without stimulating growth and biofilm formation of pathobionts directly. In multi-species environments, neutralization of H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> resulted in 2 to 3\u2009log increases in pathobionts, a hallmark for dysbiosis. Our data show that in oral biofilms, commensal species suppress the amounts of pathobionts by H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> production. Inflammation can neutralize this effect and thereby initiates dysbiosis by allowing the outgrowth of pathobionts.<\/jats:p>","DOI":"10.1038\/srep38179","type":"journal-article","created":{"date-parts":[[2016,11,29]],"date-time":"2016-11-29T10:56:54Z","timestamp":1480417014000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Dysbiosis by neutralizing commensal mediated inhibition of pathobionts"],"prefix":"10.1038","volume":"6","author":[{"given":"Esteban Rodriguez","family":"Herrero","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vera","family":"Slomka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nico","family":"Boon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristel","family":"Bernaerts","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emma","family":"Hernandez-Sanabria","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"Quirynen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wim","family":"Teughels","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,11,29]]},"reference":[{"key":"BFsrep38179_CR1","doi-asserted-by":"publisher","first-page":"8","DOI":"10.1177\/0022034509351812","volume":"89","author":"S Filoche","year":"2010","unstructured":"Filoche, S., Wong, L. & Sissons, C. 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