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Bioeng. Biotechnol."],"abstract":"<jats:p>The most recent progress in reconstructive therapy for the management of periodontitis and peri-implantitis bone defects has relied on the development of highly porous biodegradable bioaerogels for guided bone regeneration. The objective of this work was to evaluate <jats:italic>in vitro<\/jats:italic> the osteoinduction of periodontal-originating cells (human dental follicle mesenchymal cells, DFMSCs) promoted by a nano-hydroxyapatite\/chitosan (nHAp\/CS) bioaerogel, which was purified and sterilized by a sustainable technique (supercritical CO<jats:sub>2<\/jats:sub>). Moreover, the <jats:italic>in vivo<\/jats:italic> bone regeneration capacity of the nHAp\/CS bioaerogel was preliminarily assessed as a proof-of-concept on a rat calvaria bone defect model. The quantification of DNA content of DFMSCs seeded upon nHAp\/CS and CS scaffolds (control material) showed a significant increase from the 14th to the 21st day of culture. These results were corroborated through confocal laser scanning microscopy analysis (CLSM). Furthermore, the alkaline phosphatase (ALP) activity increased significantly on the 21st day, similarly for both materials. Moreover, the presence of nHAp promoted a significantly higher expression of osteogenic genes after 21\u00a0days when compared to CS scaffolds and control. CLSM images of 21\u00a0days of culture also showed an increased deposition of OPN over the nHAp\/CS surface. The <jats:italic>in vivo<\/jats:italic> bone formation was assessed by microCT and histological analysis. The <jats:italic>in vivo<\/jats:italic> evaluation showed a significant increase in bone volume in the nHAp\/CS test group when compared to CS and the empty control, as well as higher new bone formation and calcium deposition within the nHAp\/CS structure. Overall, the present study showed that the nHAp\/CS bioaerogel could offer a potential solution for periodontal and peri-implant bone regeneration treatments since the <jats:italic>in vitro<\/jats:italic> results demonstrated that it provided favorable conditions for DFMSC proliferation and osteogenic differentiation, while the <jats:italic>in vivo<\/jats:italic> outcomes confirmed that it promoted higher bone ingrowth.<\/jats:p>","DOI":"10.3389\/fbioe.2024.1355950","type":"journal-article","created":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T04:24:46Z","timestamp":1722313486000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":17,"title":["Bone regeneration driven by a nano-hydroxyapatite\/chitosan composite bioaerogel for periodontal regeneration"],"prefix":"10.3389","volume":"12","author":[{"given":"M.","family":"Souto-Lopes","sequence":"first","affiliation":[]},{"given":"L.","family":"Grenho","sequence":"additional","affiliation":[]},{"given":"Y.","family":"Manrique","sequence":"additional","affiliation":[]},{"given":"M. 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