title: 3-Dimensional cell-laden nano-hydroxyapatite/protein hydrogels for bone regeneration applications.
abstract: The ability to encapsulate cells in three-dimensional (3D) protein-based hydrogels is potentially of benefit for tissue engineering and regenerative medicine. However, as a result of their poor mechanical strength, protein-based hydrogels have traditionally been considered for soft tissue engineering only. Hence, in this study we tried to render these hydrogels suitable for hard tissue regeneration, simply by incorporation of bioactive nano-hydroxyapatite (HAp) into a photocrosslinkable gelatin hydrogel. Different cell types were also encapsulated in three dimensions in the resulting composites to prepare cell-laden constructs. According to the results, HAp significantly improves the stiffness of gelatin hydrogels, while it maintains their structural integrity and swelling ratio. It was also found that while the bare hydrogel (control) was completely inert in terms of bioactivity, a homogeneous 3D mineralization occurs throughout the nanocomposites after incubation in simulated body fluid. Moreover, encapsulated cells readily elongated, proliferated, and formed a 3D interconnected network with neighboring cells in the nanocomposite, showing the suitability of the nano-HAp/protein hydrogels for cellular growth in 3D. Therefore, the hydrogel nanocomposites developed in this study may be promising candidates for preparing cell-laden tissue-like structures with enhanced stiffness and increased osteoconductivity to induce bone formation in vivo.
authors: Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran; Department of Biomaterials, Iran Polymer and Petrochemical Institute, Tehran, Iran. Electronic address: msadatshojai@gmail.com.
authors: Mehdi
authors: M
authors: Sadat-Shojai
authors: Department of Biomaterials, Iran Polymer and Petrochemical Institute, Tehran, Iran.
authors: Mohammad-Taghi
authors: MT
authors: Khorasani
authors: Department of Novel Drug Delivery Systems, Iran Polymer and Petrochemical Institute, Tehran, Iran.
authors: Ahmad
authors: A
authors: Jamshidi
mesh_terms: D001861:Bone Regeneration / Q000187:drug effects*; D017886:Durapatite / Q000737:chemistry*; D005780:Gelatin / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D020100:Hydrogels; D005780:Gelatin; D017886:Durapatite
keywords: Bone scaffold; Bone tissue engineering; Hydrogel; Hydroxyapatite; Mineralization; Nanocomposites