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Novel glucosylceramide synthase inhibitor based prodrug copolymer micelles for delivery of anticancer agents.
- Source :
-
Journal of Controlled Release . Oct2018, Vol. 288, p212-226. 15p. - Publication Year :
- 2018
-
Abstract
- Abstract In order to improve the efficacy of chemotherapy for cancers, we have developed a novel prodrug micellar formulation to co-deliver ceramide-generating anticancer agents and ceramide degradation inhibitor (PPMP). The prodrug nanocarrier is based on a well-defined POEG- b -PPPMP diblock copolymer. The hydrophilic block of POEG- b -PPPMP is POEG, and the hydrophobic block is composed of a number of PPMP units, which could work synergistically with loaded anticancer drugs. POEG- b -PPPMP was readily synthesized via a one-step reversible addition-fragment transfer (RAFT) polymerization from a PPMP monomer. The newly synthesized polymers were self-assembled into micelles and served as a carrier for several hydrophobic anticancer drugs including DOX, PTX and C6-ceramide. POEG- b -PPPMP prodrug polymer exhibited intrinsic antitumor activity in vitro and in vivo. In addition, POEG- b -PPPMP prodrug polymer was comparable to free PPMP in selectively enhancing the production of pro-apoptotic ceramide species as well as down-regulating the mRNA expression of GCS. DOX-loaded POEG- b -PPPMP micelles exhibited an excellent stability of 42 days at 4 °C. Moreover, DOX loaded in POEG- b -PPPMP micelles showed higher levels of cytotoxicity than DOX loaded in a pharmacologically inert polymer (POEG- b -POM) and Doxil formulation in several tumor cell lines. Consistently, in a 4T1.2 murine breast cancer model, the tumor inhibition followed the order of DOX/POEG- b -PPPMP > DOX/POEG- b -POM ≥ Doxil > POEG- b -PPPMP > POEG- b -POM. Our data suggest that POEG- b -PPPMP micelles are a promising dual-functional carrier that warrants more studies in the future. Graphical abstract Unlabelled Image Highlights • We developed a new copolymer with built-in blocks of ceramide degradation inhibitor. • Our polymer formed micelles that are suitable for codelivery of other anticancer drug. • Our codelivery strategy led to selective induction of proapoptotic ceramide species. • We demonstrated significantly improved antitumor activity in vivo with the codelivery. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01683659
- Volume :
- 288
- Database :
- Academic Search Index
- Journal :
- Journal of Controlled Release
- Publication Type :
- Academic Journal
- Accession number :
- 132095300
- Full Text :
- https://doi.org/10.1016/j.jconrel.2018.09.011