Osteo-differentiation of human mesenchymal stem cells attached to natural latex proteins from the rubber tree Hevea brasiliensis on scaffold of polycaprolactone and polylactic acid (PCL/PLA) to bone xenografting
Bone defects assume importance in growing prevalence of chronic health conditions since fractures and critical defects should increase as the population ages. The bone healing depends on a dense vascular network that provides essential oxygen and nutrients, an important characteristic for the process of tissue regeneration. Conventional treatments require transplantation and extremely invasive approaches, therefore the challenge of development new therapies and treatments still growing. A promising proposal is to obtain tissue in laboratory using scaffolds for the growth and differentiation of mesenchymal stem cells and factors that enable a suitable neovascularization and osteoinduction for grafting. The protein fraction F1 from latex extracted from Hevea brasiliensis rubber tree exhibit important angiogenic and healing activity and low-cost, promising advantages for use in tissue engineering coupled with the multipotentiality of mesenchymal stem cells attached to the polycaprolactone and polylactic acid scaffold (PCL/PLA). In vitro stem cells will be isolated from human adipose tissue, expanded and characterized immunophenotypically. After that, cells will be seeded in scaffold of PCL/PLA to be cultured in the presence of normal culture media and osteogenic differentiation media in the presence and absence of F1 to evaluate cell adhesion, cell viability, osteogenic differentiation. The tissue growth and calcium deposition will be controlled by magnetic resonance imaging and computerized tomography scan of the samples, respectively. The scaffolds with cells will be implanted in rat calvarial bone model to evaluate the potential of biomaterials as bone substitute. Therefore, the objective of this work is to investigate in a preclinical study the interaction of F1 fraction from latex in human mesenchymal stem cells derived from adipose tissue (ADSCs) cultured in scaffold of PCL/PLA for osteogenic differentiation and its efficacy and safety as bone repair for use in future clinical studies.
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