Browsing by Author "Fernandez-San-Argimiro, Francisco Javier"
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Item CHANGES IN OSTEOGENESIS BY HUMAN DENTAL PULP STEM CELLS ON PORCINE DECELLULARISED ADIPOSE TISSUE SOLID FOAMS OF DIFFERENT POROSITY(2023-07-01) Luzuriaga, Jon; García-Urkia, Nerea; Salvador-Moya, Jone; Pardo-Rodríguez, Beatriz; Etxebarria, Iker; Fernandez-San-Argimiro, Francisco Javier; Olalde, Beatriz; Unda, Fernando; Pineda, Jose Ramon; Madarieta, Iratxe; Ibarretxe, Gaskon; BiomaterialesThe extracellular matrix of white adipose tissue (AT) is a very promising biomaterial for tissue engineering, due to its abundance, easy accessibility, malleability, and proven biological activity. Decellularised AT (DAT) can be processed by freeze-drying in acetic acid solutions, and changing the DAT concentration in the solution gives rise to three-dimensional (3D) scaffolds of different stiffness and porosity. In a previous report, we demonstrated that human Dental Pulp Stem Cells (hDPSCs) could differentiate to osteoblasts and generate mineralised bone on 3D solid foams of porcine Decellularised Adipose Tissue (pDAT) at a concentration of 0.5 % (w/v). In this research work, we assessed whether and how osteogenesis by hDPSCs would be regulated by testing pDAT solid foams formulated at three different concentrations: 0.25 % (w/v), 0.5 % (w/v), and 1 % (w/v), which showed different stiffness, porosity and water retention properties. As a control condition we tested solid foams formulated with 0.5 % bovine Collagen-I. Thus, we performed Alkaline Phosphatase and Alizarin Red staining, together with Transmission Electron Microscopy and the detection of osteoblastic differentiation markers Osterix and Osteocalcin at both protein and transcript level, to compare the osteogenesis mediated by hDPSCs grown on all these 3D scaffolds, in the presence or absence of osteoblastic induction media. Our results demonstrate that pDAT at 0.25 % supported osteogenesis better than the rest of tested scaffolds, including bovine Collagen-I, in 3D hDPSC cultures. This enhanced osteogenesis could be attributed to the formulation of 0.25 % pDAT solid foams, which presented a higher porosity.Item Enhanced Adipogenic Differentiation of Human Dental Pulp Stem Cells in Enzymatically Decellularized Adipose Tissue Solid Foams(2022-08) Garcia-Urkia, Nerea; Luzuriaga, Jon; Uribe-Etxebarria, Veronica; Irastorza, Igor; Fernandez-San-Argimiro, Francisco Javier; Olalde, Beatriz; Briz, Nerea; Unda, Fernando; Ibarretxe, Gaskon; Madarieta, Iratxe; Pineda, Jose Ramon; Biomateriales; SGEngineered 3D human adipose tissue models and the development of physiological human 3D in vitro models to test new therapeutic compounds and advance in the study of pathophysiological mechanisms of disease is still technically challenging and expensive. To reduce costs and develop new technologies to study human adipogenesis and stem cell differentiation in a controlled in vitro system, here we report the design, characterization, and validation of extracellular matrix (ECM)-based materials of decellularized human adipose tissue (hDAT) or bovine collagen-I (bCOL-I) for 3D adipogenic stem cell culture. We aimed at recapitulating the dynamics, composition, and structure of the native ECM to optimize the adipogenic differentiation of human mesenchymal stem cells. hDAT was obtained by a two-enzymatic step decellularization protocol and post-processed by freeze-drying to produce 3D solid foams. These solid foams were employed either as pure hDAT, or combined with bCOL-I in a 3:1 proportion, to recreate a microenvironment compatible with stem cell survival and differentiation. We sought to investigate the effect of the adipogenic inductive extracellular 3D-microenvironment on human multipotent dental pulp stem cells (hDPSCs). We found that solid foams supported hDPSC viability and proliferation. Incubation of hDPSCs with adipogenic medium in hDAT-based solid foams increased the expression of mature adipocyte LPL and c/EBP gene markers as determined by RT-qPCR, with respect to bCOL-I solid foams. Moreover, hDPSC capability to differentiate towards adipocytes was assessed by PPAR-γ immunostaining and Oil-red lipid droplet staining. We found out that both hDAT and mixed 3:1 hDAT-COL-I solid foams could support adipogenesis in 3D-hDPSC stem cell cultures significantly more efficiently than solid foams of bCOL-I, opening the possibility to obtain hDAT-based solid foams with customized properties. The combination of human-derived ECM biomaterials with synthetic proteins can, thus, be envisaged to reduce fabrication costs, thus facilitating the widespread use of autologous stem cells and biomaterials for personalized medicine.