title: Influences of tensile load on in vitro degradation of an electrospun poly(L-lactide-co-glycolide) scaffold.
abstract: Scaffolds for tissue engineering and regenerative medicine are usually subjected to different mechanical loads during in vitro and in vivo degradation. In this study, the in vitro degradation process of electrospun poly(L-lactide-co-glycolide) (PLGA) scaffolds was examined under continuous tensile load and compared with that under no load. As PLGA degraded in phosphate-buffered saline solution (pH 7.4) at 37 degrees C over a 7-week period, the tensile elastic modulus and ultimate strength of the loaded specimen increased dramatically, followed by a decrease, which was much faster than that of the unloaded specimen, whereas break elongation of the loaded samples declined more quickly over the whole degradation period. Moreover, molecular weight, thermal properties and lactic acid release showed greater degradation under load. Also, a ruptured morphology was more obvious after degradation under tensile load. The results demonstrate that tensile load increased the degradation rate of electrospun PLGA and it may be necessary to consider the effects of mechanical load when designing or applying biodegradable scaffolds. Finally, some possible explanation for the faster degradation under load is given.
authors.affiliation: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, 37 XueYuan Road, HaiDian District, Beijing 100191, People's Republic of China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Feng
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Jia
authors.forename: Yubo
authors.initials: Y
authors.lastname: Fan
mesh_terms: D001672:Biocompatible Materials / Q000494:pharmacology*; D002152:Calorimetry, Differential Scanning; D055119:Elastic Modulus / Q000187:drug effects; D019344:Lactic Acid / Q000494:pharmacology*; D008422:Materials Testing / Q000379:methods*; D008970:Molecular Weight; D011100:Polyglycolic Acid / Q000494:pharmacology*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D013696:Temperature; D013718:Tensile Strength / Q000187:drug effects / Q000502:physiology*; D013997:Time Factors; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid