Article

Human urine-derived stem cells seeded in a modified 3D porous small intestinal submucosa scaffold for urethral tissue engineering.

Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
Biomaterials (impact factor: 7.4). 11/2010; 32(5):1317-26. DOI:10.1016/j.biomaterials.2010.10.006 pp.1317-26
Source: PubMed

ABSTRACT The goal of this study was to determine whether urothelial cells (UC) and smooth muscle cells (SMC) derived from the differentiation of urine-derived stem cells (USC) could be used to form engineered urethral tissue when seeded on a modified 3-D porous small intestinal submucosa (SIS) scaffold. Cells were obtained from 12 voided urine samples from 4 healthy individuals. USC were isolated, characterized and induced to differentiate into UC and SMC. Fresh SIS derived from pigs was decellularized with 5% peracetic acid (PAA). Differentiated UC and SMC derived from USC were seeded onto SIS scaffolds with highly porous microstructure in a layered co-culture fashion and cultured under dynamic conditions for one week. The seeded cells formed multiple uniform layers on the SIS and penetrated deeper into the porous matrix during dynamic culture. USC that were induced to differentiate also expressed UC markers (Uroplakin-III and AE1/AE3) or SMC markers (α-SM actin, desmin, and myosin) after implantation into athymic mice for one month, and the resulting tissues were similar to those formed when UC and SMC derived from native ureter were used. In conclusion, UC and SMC derived from USC could be maintained on 3-D porous SIS scaffold. The dynamic culture system promoted 3-D cell-matrix ingrowth and development of a multilayer mucosal structure similar to that of native urinary tract tissue. USC may serve as an alternative cell source in cell-based tissue engineering for urethral reconstruction or other urological tissue repair.

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Keywords

3-D cell-matrix ingrowth
 
3-D porous SIS scaffold
 
4 healthy individuals
 
5% peracetic acid
 
alternative cell source
 
cell-based tissue engineering
 
Differentiated UC
 
dynamic culture
 
dynamic culture system
 
Fresh SIS
 
layered co-culture fashion
 
multilayer mucosal structure
 
multiple uniform layers
 
native urinary tract tissue
 
porous microstructure
 
seeded cells
 
smooth muscle cells
 
urethral tissue
 
urological tissue
 
urothelial cells