title: New ureteral scaffold constructed with composite poly(L-lactic acid)-collagen and urothelial cells by new centrifugal seeding system.
abstract: A tissue-engineered ureteral scaffold was constructed with composited poly L-lactic acid (PLLA)-collagen endoluminal stent and uroepithelial cells (UECs) using a new seeding system. The electrospun PLLA-collagen nanofibrous mesh was seeded efficiently with human ureteral epithelial cells using a modified centrifugal seeding device. The cellular nanofibrous mesh was then wound around a spiral endoluminal stent to form a cellular composited PLLA-collagen ureteral scaffold. The cellular ureteral scaffold was subcutaneously implanted into nude mice. Cell attachment, distribution, and viability in vitro were investigated along with the cell fate in vivo. (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay showed that scaffolds seeded with centrifugal method had higher cellular activity than scaffolds seeded with static method (p < 0.05), and the metabolic activity per cell had no significant differences between the two methods (p > 0.05). Histologic analysis showed that the entrapped UECs remained in the scaffolds after 2 wk of implantation. The results of the study indicated that the composited PLLA-collagen endoluminal stent could serve as alternative cell carrier for tissue engineering ureter. In addition, the new modified centrifugal seeding system allowed rapid homogeneous distribution of cells onto the nanofibrous mesh, which will be useful to ureteral reconstruction.
authors.affiliation: Department of Urology, Chinese People's Liberation Army General Hospital, Military Postgraduate Medical College, Haidian District, Beijing 100853, People's Republic of China. fuweijun@hotmail.com
authors.forename: Wei-Jun
authors.initials: WJ
authors.lastname: Fu
authors.forename: Yong-De
authors.initials: YD
authors.lastname: Xu
authors.forename: Zhong-Xin
authors.initials: ZX
authors.lastname: Wang
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Shi
authors.forename: Fu-Zhai
authors.initials: FZ
authors.lastname: Cui
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xu
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000818:Animals; D002478:Cells, Cultured; D002498:Centrifugation / Q000379:methods*; D003094:Collagen; D006801:Humans; D019344:Lactic Acid; D051379:Mice; D008819:Mice, Nude; D008875:Middle Aged; D011091:Polyesters; D011108:Polymers; D054457:Tissue Scaffolds; D014513:Ureter / Q000166:cytology; D019459:Urothelium / Q000166:cytology*
chemical_list: D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide); D003094:Collagen