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Pubmed ID :29995642
Publication Date : //

Silk fibroin-bioactive glass based advanced biomaterials: towards patient-specific bone grafts.


A major challenge in bone tissue engineering is to develop patient-specific, defect-site specific grafts capable of triggering specific cell signaling pathways. We could programmably fabricate the 3D printed bone constructs via direct ink writing of silk-gelatin-bioactive glass (SF-G-BG) hybrids using two different compositions of melt-derived bioactive glasses (with and without strontium) and compared against commercial 45S5 Bioglass. Physico-chemical characterization revealed that released ions from bioactive glasses inhibited the conformational change of Bombyx mori silk fibroin protein (from random coil to β-sheet conformation), affecting printability of the SF-G-BG ink. In-depth molecular investigations showed that strontium containing SF-G-BG constructs demonstrated superior osteogenic differentiation of mesenchymal stem cells (TVA-BMSCs) over 21 days towards osteoblastic (marked by upregulated expression of runt related transcription factor, alkaline phosphatase, osteopontin, osteonectin, integrin bone sialoprotein, osteocalcin) and osteocytic (marked by podoplanin, dentin matrix acidic phosphoprotein, sclerostin) phenotype compared to other BG compositions and silk-gelatin alone. Moreover, ionic release from bioactive glasses in the silk-gelatin ink triggered the activation of signaling pathways (BMP-2, BMP-4 and IHH), which are critical in regulating bone formation in vivo. Overall, the presence of strontium containing bioactive glass in silk-gelatin matrices provided appropriate cues in regulating the development of custom-made 3D in vitro human bone constructs.

Authors : Midha Swati , Kumar Sumit , Sharma Aarushi , Kaur Kulwinder , Shi Xiaomeng , Naruphontjirakul Parichart , Jones Julian R , Ghosh Sourabh ,

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