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Implantable Controlled Release Devices For BMP-7 Delivery And Suppression Of Glioblastoma Initiating Cells.
Elaine Reguera-Nuñez, C. Roca, Eugenio Hardy, M. de la Fuente, N. Csaba, M. Garcia-Fuentes
Published 2014 · Materials Science, Medicine
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Designing therapeutic devices capable of manipulating glioblastoma initiating cells (GICs) is critical to stop tumor recurrence and its associated mortality. Previous studies have indicated that bone morphogenetic protein-7 (BMP-7) acts as an endogenous suppressor of GICs, and thus, it could become a treatment for this cancer. In this work, we engineer an implantable microsphere system optimized for the controlled release of BMP-7 as a bioinspired therapeutic device against GICs. This microsphere delivery system is based on the formation of a heparin-BMP-7 nanocomplex, first coated with Tetronic(®) and further entrapped in a biodegradable polyester matrix. The obtained microspheres can efficiently encapsulate BMP-7, and release it in a controlled manner with minimum burst effect for over two months while maintaining protein bioactivity. Released BMP-7 showed a remarkable capacity to stop tumor formation in a GICs cell culture model, an effect that could be mediated by forced reprogramming of tumorigenic cells towards a non-tumorigenic astroglial lineage.
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