title: pH-responsive hydrogels containing PMMA nanoparticles: an analysis of controlled release of a chemotherapeutic conjugate and transport properties.
abstract: Biopolymers composed of a pH-responsive, hydrophilic poly(methacrylic acid-grafted-ethylene glycol) network polymerized in the presence of poly(methyl methacrylate) nanoparticles were designed for the oral delivery of chemotherapeutics for the treatment of colon cancer. An inulin-doxorubicin conjugate, designed to target the colon and improve doxorubicin efficacy, was loaded into these polymer carriers at an efficiency of 54%. Release studies indicated these polymer carriers minimized conjugate release in low pH conditions and released the conjugate at neutral pH conditions using a two-step pH experiment modeling the stomach and the small intestine. At lower concentration levels, the presence of the polymer carriers did not disrupt tight junctions as determined by transepithelial electrical resistance studies using Caco-2 and HT29-MTX cell lines which are an accurate model of the GI tract epithelia. Permeability values of unmodified doxorubicin and the inulin-doxorubicin conjugate in the presence of the polymer carriers were also determined using the same cell models and ranged from 1.87 to 3.80 × 10 (-6) cm/s.
authors.affiliation: Department of Chemical Engineering , The University of Texas at Austin, Austin, TX 78712, USA.
authors.forename: Cody A
authors.initials: CA
authors.lastname: Schoener
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Peppas
mesh_terms: D018938:Caco-2 Cells; D002460:Cell Line; D003692:Delayed-Action Preparations / Q000737:chemistry / Q000493:pharmacokinetics; D004317:Doxorubicin / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D004337:Drug Carriers / Q000032:analysis / Q000138:chemical synthesis / Q000737:chemistry / Q000493:pharmacokinetics*; D004353:Drug Evaluation, Preclinical; D019855:Ethylene Glycol / Q000737:chemistry; D019073:HT29 Cells; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry* / Q000493:pharmacokinetics*; D006863:Hydrogen-Ion Concentration; D007444:Inulin / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D053758:Nanoparticles / Q000737:chemistry*; D044367:Phase Transition; D011108:Polymers / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D019904:Polymethyl Methacrylate / Q000737:chemistry*
chemical_list: D003692:Delayed-Action Preparations; D004337:Drug Carriers; D011108:Polymers; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D004317:Doxorubicin; D007444:Inulin; D019904:Polymethyl Methacrylate; D019855:Ethylene Glycol