title: Polyester scaffolds with bimodal pore size distribution for tissue engineering.
abstract: This paper presents a method for the preparation of porous poly(L-lactide)/poly[(L-lactide)-co-glycolide] scaffolds for tissue engineering. Scaffolds were prepared by a mold pressing-salt leaching technique from structured microparticles. The total porosity was in the range 70-85%. The pore size distribution was bimodal. Large pores, susceptible for osteoblasts growth and proliferation had the dimensions 50-400 microm. Small pores, dedicated to the diffusion of nutrients or/and metabolites of bone forming cells, as well as the products of hydrolysis of polyesters from the walls of the scaffold, had sizes in the range 2 nm-5 microm. The scaffolds had good mechanical strength (compressive modulus equal to 41 MPa and a strength of 1.64 MPa for 74% porosity). Scaffolds were tested in vitro with human osteoblast-like cells (MG-63). It was found that the viability of cells seeded within the scaffolds obtained using the mold pressing-salt leaching technique from structured microparticles was better when compared to cells cultured in scaffolds obtained by traditional methods. After 34 d of culture, cells within the tested scaffolds were organized in a tissue-like structure. Photos of section of macro- and mesoporous PLLA/PLGA scaffold containing 50 wt.-% of PLGA microspheres after 34 d of culture. Dark spots mark MG-63 cells, white areas belong to the scaffold. The specimen was stained with haematoxylin/eosin. Bar = 100 microm.
authors.affiliation: Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland. stasosno@bilbo.cbmm.lodz.pl
authors.forename: Stanislaw
authors.initials: S
authors.lastname: Sosnowski
authors.forename: Piotr
authors.initials: P
authors.lastname: Woźniak
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Lewandowska-Szumieł
mesh_terms: D001673:Biodegradation, Environmental; D018929:Cell Culture Techniques; D045744:Cell Line, Tumor; D003470:Culture Media / Q000737:chemistry; D006801:Humans; D019344:Lactic Acid / Q000138:chemical synthesis* / Q000737:chemistry; D008856:Microscopy, Fluorescence; D008863:Microspheres; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure; D012516:Osteosarcoma / Q000473:pathology; D011091:Polyesters / Q000138:chemical synthesis* / Q000737:chemistry; D011100:Polyglycolic Acid / Q000138:chemical synthesis* / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D016062:Porosity; D013997:Time Factors; D023822:Tissue Engineering
chemical_list: D003470:Culture Media; D011091:Polyesters; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid