关键词:
Bioinks
Cell-laden
Collagen
Gelatin methacryloyl(GelMA)
Hypoxia
摘要:
Osteosarcoma,an aggressive bone cancer found most often in children and adolescents,remains difficult to treat,and little improvement in survival rate has been observed over recent *** tumor microenvironment(TME),especially the extracellular matrix(ECM),is a critical factor determining cancer progression and chemotherapy resistance,yet traditional 2D models generally fail to replicate its *** development of 3D-bioprinted tumor models has facilitated improved simulation of the complexity of the TME,but specific models involving bioinks tailored to osteosarcoma remain *** methacryloyl(GelMA)is a common bioink that can rapidly gel and contains Arg-Gly-Asp(RGD)***,it lacks collagen’s triple-helix structure that is essential for ECM-cell *** acid(HA)is a macromolecule that is aberrantly expressed in osteosarcoma by mechanisms that remain largely *** this study,we developed a composite bioink containing GelMA,collagen,and HA,and applied it to 3D bioprint an in vitro osteosarcoma *** found that HA significantly enhanced osteosarcoma cell proliferation and chemoresistance,as well as the expression of epithelial-mesenchymal transition and cancer stem cell ***,we found that HA abundance was positively correlated with hypoxia and angiogenesis signaling pathways,and this occurred mainly via upregulation of hypoxia-inducible factor-1α(HIF-1α)and vascular endothelial growth factor A(VEGFA)expression,thereby contributing to increased ***,our study provides a protocol for building in vitro realistic 3D-bioprinted models for studying osteosarcoma,highlights the role of HA in osteosarcoma progression,and offers a platform for developing new chemotherapy treatments.