title: Biodegradable PLGA microcarriers for injectable delivery of chondrocytes: effect of surface modification on cell attachment and function.
abstract: Poly(D,L-lactic-co-glycolic acid) (PLGA) microspheres were prepared by an oil/water emulsion solvent evaporation method to use as an injectable microcarrier for cell delivery. Three different kinds of PLGA microspheres having hydrophobic, negatively charged, and positively charged surfaces were prepared. Hydrophobic and negatively charged PLGA microspheres were prepared by using terminally capped and uncapped PLGA polymer, respectively. Positively charged PLGA microspheres were prepared by blending PLGA with PLGA-g-poly(L-lysine) graft copolymer as a surface modifying agent. Bovine chondrocytes were cultured on the three PLGA microspheres under serum conditions to comparatively evaluate cell attachment, cell proliferation, and cell function with respect to surface properties. Positively charged PLGA microspheres showed the highest cell attachment, growth, and function compared to hydrophobic and negatively charged microspheres. Surface-modified PLGA microspheres can potentially be used as an injectable delivery system for cells into a tissue defect site.
authors.affiliation: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
authors.forename: Ki Woo
authors.initials: KW
authors.lastname: Chun
authors.forename: Hyuk Sang
authors.initials: HS
authors.lastname: Yoo
authors.forename: Jun Jin
authors.initials: JJ
authors.lastname: Yoon
authors.forename: Tae Gwan
authors.initials: TG
authors.lastname: Park
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D002417:Cattle; D002448:Cell Adhesion / Q000502:physiology; D018929:Cell Culture Techniques / Q000379:methods*; D049109:Cell Proliferation; D002470:Cell Survival; D002478:Cells, Cultured; D019902:Chondrocytes / Q000166:cytology / Q000502:physiology* / Q000637:transplantation*; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry*; D008081:Liposomes / Q000737:chemistry; D008422:Materials Testing / Q000379:methods; D008845:Microinjections / Q000379:methods; D008863:Microspheres; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties; D023822:Tissue Engineering / Q000379:methods*; D016378:Tissue Transplantation / Q000379:methods*
chemical_list: D020099:Coated Materials, Biocompatible; D008081:Liposomes; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid