title: In vivo biofunctionality comparison of different topographic PLLA scaffolds.
abstract: In this work, the in vivo biodegradation of, biocompatibility of, and host response to various topographic scaffolds were investigated. Randomly oriented fibrous poly(L-lactide) (PLLA) nanofibers were fabricated using the electrospinning technique. A PLLA scaffold was obtained by salt leaching. Both the electrospun PLLA nanofibers and the salt-leaching PLLA scaffolds formed three-dimensional pore structures. Cytotoxicity studies, in which rat muscle-derived stem cells (rMDSCs) were grown on electrospun PLLA nanofibers or the salt-leaching PLLA scaffolds, revealed that the rMDSCs cell count on the PLLA nanofibers was slightly higher than that on the salt-leaching PLLA scaffolds. An in vivo study was carried out by implanting the scaffolds subcutaneously into rats to test the biodegradation, biocompatibility, and host response at regular intervals over 0-4 weeks. The degradation of the PLLA nanofibers 1, 2, and 4 weeks after initial implantation was more extensive than that observed for the salt-leaching PLLA scaffolds. PLLA nanofibers seeded the growth of larger fibrous tissue masses due to in vivo cellular infiltration into the randomly oriented fibrillar structures of the PLLA nanofibers. In addition, the inflammatory cell accumulation in PLLA nanofibers was lower than that in the salt-leaching PLLA scaffolds. These results indicate that the electrospun PLLA nanofibers may serve as a good scaffold to elicit fibrous cellular infiltration, to minimize host response, and to enhance tissue-scaffold integration.
authors.affiliation: Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Korea.
authors.forename: Bit Na
authors.initials: BN
authors.lastname: Lee
authors.forename: Da Yeon
authors.initials: DY
authors.lastname: Kim
authors.forename: Hwi Ju
authors.initials: HJ
authors.lastname: Kang
authors.forename: Jin Seon
authors.initials: JS
authors.lastname: Kwon
authors.forename: Young Hwan
authors.initials: YH
authors.lastname: Park
authors.forename: Heung Jae
authors.initials: HJ
authors.lastname: Chun
authors.forename: Jae Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Hai Bang
authors.initials: HB
authors.lastname: Lee
authors.forename: Byoung Hyun
authors.initials: BH
authors.lastname: Min
authors.forename: Moon Suk
authors.initials: MS
authors.lastname: Kim
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D002850:Chromatography, Gel; D008855:Microscopy, Electron, Scanning; D009132:Muscles / Q000166:cytology; D011091:Polyesters; D051381:Rats; D011916:Rats, Inbred F344; D013234:Stem Cells / Q000166:cytology; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; C033616:poly(lactide)