PolySciTech (www.polyscitech.com) provides a wide array of block copolymers including mPEG-PLGA. Recently this type of polymer was used for delivering doxorubicin as a breast cancer treatment. Read more: Alibolandi, Mona, Fatemeh Sadeghi, Khalil Abnous, Fatemeh Atyabi, Mohammad Ramezani, and Farzin Hadizadeh. "The chemotherapeutic potential of doxorubicin-loaded PEG-b-PLGA nanopolymersomes in mouse breast cancer model." European Journal of Pharmaceutics and Biopharmaceutics (2015). http://www.sciencedirect.com/science/article/pii/S0939641115002945
“Abstract: Vesicles of mPEG-PLGA block copolymer were developed to deliver a therapeutic quantity of doxorubicin (DOX) for breast cancer treatment. The DOX-loaded nanoparticles (NPs) were prepared by the pH-gradient method and then evaluated in terms of morphology, size, DOX encapsulation efficiency and in vitro drug release mechanism. The PEG-PLGA nanopolymersomes were 134 ± 1.2 nm spherical NPs with a narrow size distribution (PDI = 0.121). DOX was entrapped in mPEG-PLGA nanopolymersomes with an encapsulation efficiency and a loading content of 91.25 ± 4.27% and 7.3 ± 0.34%, respectively. The DOX-loaded nanopolymersomes were found to be stable, demonstrating no significant change in particle size and encapsulation efficiency (EE%) during the 6-month storage period of the lyophilized powder at 4 °C. The nanopolymersomes sustained the release of DOX. In cytotoxicity studies of 4T1 cell line samples, free DOX showed a higher cytotoxicity (IC50 = 1.76 μg/mL) than did DOX-loaded nanopolymersomes (15.82 μg/mL) in vitro. In order to evaluate the antitumor efficacy and biodistribution of DOX-loaded nanopolymersomes, murine breast tumors were established on the BALB/c mice, and in vivo studies were performed. The obtained results demonstrated that the prepared drug delivery system was highly effective against a murine breast cancer tumor model and successfully accumulated in the tumor site through an enhanced permeation and retention mechanism. In vivo studies also proved that DOX-loaded nanopolymersomes are stable in blood circulation and could be considered a promising and effective DOX delivery system for breast cancer treatment.
Highlights:Vesicles of mPEG-PLGA block copolymer were developed to deliver therapeutic quantity of doxorubicin for breast cancer treatment. The doxorubicin loaded nanoparticles were fabricated by pH gradient method. The PEG-PLGA nanopolymersomes were 134 ± 1.2 nm spherical nanoparticles with narrow size distribution (PDI = 0.121). Doxorubicin was entrapped in mPEG-PLGA nanopolymersomes with encapsulation efficiency and loading content of 91.25 ± 4.27%. The prepared drug delivery system was highly effective against murine breast cancer tumor model. Keywords: Doxorubicin; Breast cancer; Nanopolymersome; Drug delivery; Breast cancer; 4T1”