title: Development of cell-penetrating peptide-modified MPEG-PCL diblock copolymeric nanoparticles for systemic gene delivery.
abstract: To develop a safe and efficient systemic non-viral gene vector, methoxy poly(ethylene glycol) (MPEG)/poly(epsilon-caprolactone) (PCL) diblock copolymers conjugated with a Tat analog through the ester or disulfide linkage were synthesized and their suitability as a systemic non-viral gene carrier evaluated. The physicochemical properties of the MPEG-PCL diblock copolymers were determined by GPC, (1)H NMR and FT-IR spectroscopy. The particle sizes and in vitro (COS7 and S-180 cells) transfection efficiencies and cytotoxicity were evaluated. Furthermore, the luciferase activity was then determined in various tissues after intravenous injection of MPEG-PCL-SS-Tat/pCMV-Luc complex into mice bearing S-180 cells. The particle sizes of the MPEG-PCL-Tat copolymers with or without pDNA were about 40 and 60nm, respectively. The luciferase activity in COS7 cells transfected with pCMV-Luc with MPEG-PCL-ester-Tat or MPEG-PCL-SS-Tat was higher than that with pDNA only. MPEG-PCL-SS-Tat greatly increased the transfection efficiency compared to MPEG-PCL-ester-Tat in COS7 and S-180 cells. In an in vitro cytotoxicity test MPEG-PCL-SS-Tat did not induce any remarkable cytotoxicity. In an in vivo experiment, the synthesized MPEG-PCL-SS-Tat copolymers promoted the delivery and expression of pDNA into tumor tissue in tumor-bearing mice. In conclusion, this vector might be applicable as a tumor-targeting non-viral systemic gene carrier in the clinical setting.
authors.affiliation: Laboratory of Pharmaceutics and Drug Delivery, Department of Pharmaceutical Science, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Tanaka
authors.forename: Takanori
authors.initials: T
authors.lastname: Kanazawa
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Shibata
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Suda
authors.forename: Tsunehiko
authors.initials: T
authors.lastname: Fukuda
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Takashima
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Okada
mesh_terms: D000818:Animals; D019556:COS Cells; D002463:Cell Membrane Permeability; D002470:Cell Survival / Q000187:drug effects; D002522:Chlorocebus aethiops; D002850:Chromatography, Gel; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D017930:Genes, Reporter; D007275:Injections, Intravenous; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D008813:Mice, Inbred ICR; D053758:Nanoparticles; D010316:Particle Size; D010446:Peptide Fragments / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity; D011091:Polyesters / Q000737:chemistry* / Q000633:toxicity; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000633:toxicity; D012510:Sarcoma 180 / Q000235:genetics / Q000378:metabolism; D017550:Spectroscopy, Fourier Transform Infrared; D014162:Transfection / Q000379:methods*; D054322:tat Gene Products, Human Immunodeficiency Virus / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity
chemical_list: D010446:Peptide Fragments; D011091:Polyesters; C439611:methoxy poly(ethylene glycol-co-epsilon-caprolactone); D054322:tat Gene Products, Human Immunodeficiency Virus; C520542:tat peptide (48-57), Human immunodeficiency virus 1; D011092:Polyethylene Glycols