title: Preparation and biocompatibility study of in situ forming polymer implants in rat brains.
abstract: We describe the development of polymer implants that were designed to solidify once injected into rat brains. These implants comprised of glycofurol and copolymers of D: ,L: -lactide (LA), ε-caprolactone and poly(ethylene glycol) (PLECs). Scanning electron microscopy (SEM) and gel permeation chromatography (GPC) showed that the extent of implant degradation was increased with LA: content in copolymers. SEM analysis revealed the formation of porosity on implant surface as the degradation proceeds. PLEC with 19.3% mole of LA: was chosen to inject in rat brains at the volume of 10, 25 and 40 μl. Body weights, hematological and histopathological data of rats treated with implants were evaluated on day 3, 6, 14, 30 and 45 after the injection. Polymer solution at the injection volume of 10 μl were tolerated relatively well compared to those of 25 and 40 μl as confirmed by higher body weight and healing action (fibrosis tissue) 30 days after treatment. The results from this study suggest a possible application as drug delivery systems that can bypass the blood brain barrier.
authors.affiliation: Department of Biomedical Engineering, Faculty of Engineering, Mahidol University, Nakorn Pathom, Thailand. egnns@mahidol.ac.th
authors.forename: Norased
authors.initials: N
authors.lastname: Nasongkla
authors.forename: Atthaporn
authors.initials: A
authors.lastname: Boongird
authors.forename: Suradej
authors.initials: S
authors.lastname: Hongeng
authors.forename: Chawan
authors.initials: C
authors.lastname: Manaspon
authors.forename: Noppadol
authors.initials: N
authors.lastname: Larbcharoensub
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D001921:Brain / Q000378:metabolism*; D002208:Caproates / Q000737:chemistry; D002490:Central Nervous System / Q000378:metabolism; D002850:Chromatography, Gel / Q000379:methods; D019344:Lactic Acid / Q000737:chemistry; D007783:Lactones / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D011091:Polyesters / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D051381:Rats; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials; D002208:Caproates; D007783:Lactones; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; D011092:Polyethylene Glycols; C121056:caprolactone; C018557:glycofurol