1. Multifunctional Polymeric Prodrug with Simultaneous Conjugating Camptothecin and Doxorubicin for pH/Reduction Dual-Responsive Drug Delivery
- Author
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Sun Yue, Jinlin He, Jie Liu, Lei Li, Dong Shuxiang, Peihong Ni, and Mingzu Zhang
- Subjects
010407 polymers ,Materials science ,Cell Survival ,Polymers ,PH reduction ,Antineoplastic Agents ,02 engineering and technology ,01 natural sciences ,Cell Line, Tumor ,Amphiphile ,medicine ,Humans ,Prodrugs ,heterocyclic compounds ,General Materials Science ,MTT assay ,Doxorubicin ,Drug Carriers ,Microscopy, Confocal ,Hydrogen-Ion Concentration ,Prodrug ,021001 nanoscience & nanotechnology ,Combinatorial chemistry ,0104 chemical sciences ,Drug Liberation ,Drug delivery ,Nanoparticles ,Camptothecin ,0210 nano-technology ,Hydrophobic and Hydrophilic Interactions ,medicine.drug ,Conjugate - Abstract
Amphiphilic polymeric prodrugs show improved therapeutic indices with respect to traditional hydrophobic anticancer drugs because these prodrugs can self-assemble into nanoparticles, prolong the circulation of drugs in the blood, improve the accumulation of drugs in the disease site, reduce the side effects of drugs, and achieve therapeutic effect. Here, we describe a novel pH/reduction dual-responsive polymeric prodrug, abbreviated as CPT- ss-poly(BYP- hyd-DOX- co-EEP), with simultaneous conjugating camptothecin (CPT) and doxorubicin (DOX), wherein BYP and EEP represent two cyclic phosphate monomers, respectively, that is, 2-(but-3-yn-1-yloxy)-2-oxo-1,3,2-dioxaphospholane and 2-ethoxy-2-oxo-1,3,2-dioxaphospholane. This prodrug was prepared through a polyphosphoester-DOX conjugate using a CPT derivative (CPT- ss-OH) as the initiator. CPT is linked to the terminal of polyphosphoester via disulfide carbonate, which is easy to break up under intracellular reductive environment and release the parent CPT, whereas DOX was efficiently incorporated onto the pendants of polyphosphoester through a hydrazone bond (- hyd-), which would be cleaved in the intracellular acidic medium. We show that the stable prodrug nanoparticles formed by self-assembly could release CPT and DOX simultaneously in the tumor microenvironment. The results of MTT assay demonstrate that the prodrug, which binds two antitumor drugs simultaneouly, has the properties of dual pH/reduction sensitiveness, biocompatibility, biodegradability, and effective tumor therapy.
- Published
- 2019