Thursday, October 23, 2014

PLGA-PEG-PLGA thermogel used for osterosarcoma treatment

PolySciTech ( provides a wide variety of PLGA-PEG-PLGA triblock thermogels for use as drug delivery depots. Recently researchers have utilized similar polymers to deliver SiRNA and doxorubicin to osterosarcoma cells successfully inducing apoptosis both in-vitro and in nude mice. Read more: Ma, Hecheng, Chaoliang He, Yilong Cheng, Dongsong Li, Yubao Gong, Jianguo Liu, Huayu Tian, and Xuesi Chen. "PLK1shRNA and doxorubicin co-loaded thermosensitive PLGA-PEG-PLGA hydrogels for osteosarcoma treatment." Biomaterials 35, no. 30 (2014): 8723-8734.

“Abstract: Combination cancer therapy has emerged as crucial approach for achieving superior anti-cancer efficacy. In this study, we developed a strategy by localized co-delivery of PLK1shRNA/polylysine-modified polyethylenimine (PEI-Lys) complexes and doxorubicin (DOX) using biodegradable, thermosensitive PLGA-PEG-PLGA hydrogels for treatment of osteosarcoma. When incubated with osteosarcoma Saos-2 and MG-63 cells, the hydrogel containing PLK1shRNA/PEI-Lys and DOX displayed significant synergistic effects in promoting the apoptosis of osteosarcoma cells in vitro. After subcutaneous injection of the hydrogel containing PLK1shRNA/PEI-Lys and DOX beside the tumors of nude mice bearing osteosarcoma Saos-2 xenografts, the hydrogels exhibited superior antitumor efficacy in vivo compared to the hydrogels loaded with PLK1shRNA/PEI-Lys or DOX alone. It is noteworthy that the combination treatment in vivo led to almost complete suppression of tumor growth up to 16 days, significantly enhanced PLK1 silencing, higher apoptosis of tumor masses, as well as increased cell cycle regulation. Additionally, ex vivo histological analysis of major organs of the mice indicated that the localized treatments showed no obvious damage to the organs, suggesting lower systemic toxicity of the treatments. Therefore, the strategy of localized, sustained co-delivery of PLK1shRNA and DOX by using the biodegradable, injectable hydrogel may have potential for efficient clinical treatment of osteosarcoma. Keywords: Combination therapy; PLK1 silencing; Synergistic effect; Localized delivery; Injectable hydrogel; Osteosarcoma”
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