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Glycogen-nucleic acid constructs for gene silencing in multicellular tumor spheroids.
Abstract The poor penetration of nanocarrier-siRNA constructs into tumor tissue is a major hurdle for the in vivo efficacy of siRNA therapeutics, where the ability of the constructs to permeate the 3D multicellular matrix is determined by their physicochemical properties. Herein, we optimized the use of soft glycogen nanoparticles for the engineering of glycogen-siRNA constructs that can efficiently penetrate multicellular tumor spheroids and exert a significant gene silencing effect. Glycogen nanoparticles from different bio-sources and with different structural features were investigated. We show that larger gl...
Source: Biomaterials - May 20, 2018 Category: Materials Science Authors: Wojnilowicz M, Besford QA, Wu YL, Loh XJ, Braunger JA, Glab A, Cortez-Jugo C, Caruso F, Cavalieri F Tags: Biomaterials Source Type: research

The use of collagen-based scaffolds to simulate prostate cancer bone metastases with potential for evaluating delivery of nanoparticulate gene therapeutics.
In conclusion, development of a novel 3D cell culture model of prostate cancer bone metastasis has been initiated resulting, for the first time, in the successful delivery of gene therapeutics in a 3D in vitro model. Further enhancement of this model will help elucidate the pathogenesis of prostate cancer and also accelerate the design of effective therapies which can penetrate into the bone microenvironment for prostate cancer therapy. PMID: 26196533 [PubMed - as supplied by publisher]
Source: Biomaterials - July 14, 2015 Category: Materials Science Authors: Fitzgerald KA, Guo J, Tierney EG, Curtin CM, Malhotra M, Darcy R, O'Brien FJ, O'Driscoll CM Tags: Biomaterials Source Type: research

PSA-responsive and PSMA-mediated multifunctional liposomes for targeted therapy of prostate cancer.
In this study, we constructed a dual-modified liposome that incorporated PSA-responsive and PSMA-mediated liposomes and potentially offers double selectivity for PC. The folate moiety binds quickly to PSMA-positive tumors, and the PSA-responsive moiety is cleaved by PSA that was enriched in tumor tissues. The activated liposomes (folate and cell-penetrating peptides dual-modifications) are subsequently taken up by the tumor cells via polyarginine's penetrating effects and receptor-mediated endocytosis. To corroborate these assumptions, a series of experiments were conducted, including PSA-responsive peptide hydrolysis kine...
Source: Biomaterials - June 15, 2013 Category: Materials Science Authors: Xiang B, Dong DW, Shi NQ, Gao W, Yang ZZ, Cui Y, Cao DY, Qi XR Tags: Biomaterials Source Type: research

Trilayer micelles for combination delivery of rapamycin and siRNA targeting Y-box binding protein-1 (siYB-1).
In this study, it has been shown that PCL can encapsulate RAP with high loading efficiencies, and PAsp(DET) can successfully interact with siRNA for efficient transfection/knockdown with negligible cytotoxicity. The enhanced therapeutic efficacy of RAP/siYB-1 micelles was demonstrated in cell cultures and in a PC3 xenograft nude mouse model of human prostate cancer. Herein, we demonstrate that trilayer micelles are a promising approach to improve the simultaneous delivery of combination siRNA/drug therapies. PMID: 23768780 [PubMed - as supplied by publisher]
Source: Biomaterials - June 11, 2013 Category: Materials Science Authors: Zeng S, Xiong MP Tags: Biomaterials Source Type: research