Effect of the injectable alginate/ nano-hydroxyapatite and the silica/ nano-hydroxyapatite composites on the stem cells: a comparative study

• Published in: Journal of non-crystalline solids Vol. 610; p. 122327
• Main Authors: Sayed, M., Mahmoud, E.M., Saber, Shehabeldin M, Raafat, Shereen N, Gomaa, Shaimaa M, Naga, S.M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-06-2023
• Subjects: Alginate; Human periodontal ligament stem cells; In-vitro; Injectable composite; Mesenchymal stem cells; Nano-hydroxyapatite; Viscosity; Viscosity; Nano-hydroxyapatite; Injectable composite; Alginate; Human periodontal ligament stem cells; In-vitro; Mesenchymal stem cells
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2023.122327

•The article reports on the fabrication of injectable hydrogels composities based on natural sources and the investigation of their potential use as injectable scaffolds for bone repairing.•In-vitro analysis show SiO2/n-HA injectable hydrogel displayed higher biodegradability and water absorption than Alg/n-HA. Additionally, SEM examination showed that both systems encourage bone regeneration.•The MTT assay showed that the cytocompatibility and cell viability for all examined hydrogels were greater than 70% at all observation points.•All the examined samples promoted wound healing at closure rates significantly higher than those for the control group at all observation points.
Self-setting bone pastes are currently attracting considerable attention in the field of treating damaged bones. In this study, natural nano-hydroxyapatite enriched with trace elements was combined with silica (SiO2/n-HA) or natural alginate (Alg/n-HA) to innovate biocomposite injectable hydrogels. The injectable pastes' porosity, viscosity, setting time, and mechanical properties were tested. Moreover, in-vitro characteristics and the influence of the developed injectable hydrogels on the cytocompatibility of mesenchymal stem cells were also studied. According to the results, the type of hydrogel incorporated with nano-hydroxyapatite had a significant influence on the physicomechanical properties. The Alg/n-HA had higher mechanical and viscosity properties reached to 6.31 MPa and 1680 Pa-S in comparison to 2.93 MPa and 1415 Pa-S for SiO2/n-HA, respectively. Otherwise, SiO2/n-HA had higher biodegradability and water absorption. Cytocompatibility assays results showed that mesenchymal stem cell viability exceeded 70% for all dilutions of n-HA, Alg/n-HA and SiO2/n-HA at all observation points, also the tested hydrogels promoted wound healing at closure rates that were significantly higher than the control group at all observation points (p<0.05). Complete wound closure was observed for Alg/n-HA and SiO2/n-HA after 72 h.