Constructs of electrospun PLGA, compressed collagen and minced urothelium for minimally manipulated autologous bladder tissue expansion.
Bladder regeneration based on minced bladder mucosa in vivo expansion is an alternative to in vitro culturing of urothelial cells. Here, we present the design of a hybrid, electrospun poly(lactic-co-glycolide) (PLGA) - plastically compressed (PC) collagen scaffold that could allow in vivo bladder mucosa expansion. Optimisation of electrospinning was performed in order to obtain increased pore sizes and porosity to consolidate the construct and to support neovascularisation and tissue ingrowth. Tensile tests showed an increase in average tensile strength from 0.6 MPa for PC collagen to 3.57 MPa for the hybrid construct. The optimised PLGA support scaffold was placed between two collagen gels, and the minced tissue was distributed either on top or both on top and inside the construct prior to PC; this was then cultured for up to four weeks. Morphology, histology and SEM demonstrated that the construct maintained its integrity throughout cell culture. Cells from minced tissue migrated, expanded and re-organised to a confluent cell layer on the top of the construct after two weeks and formed a multilayered urothelium after four weeks. Cell morphology and phenotype was typical for urothelial mucosa during tissue culture.
Textile Department, Isfahan University of Technology, Isfahan, Iran; Division of Polymer Chemistry, A Science for Life Laboratory, Department of Chemistry - Ångström Laboratory, Uppsala University, Uppsala, Sweden. Electronic address: ajalouian@tx.iut.ac.ir.
Fatemeh
F
Ajalloueian
Department of Women's and Children's Health, Centre of Molecular Medicine, Karolinska Institutet, Stockholm, Sweden; Department of Paediatric Surgery, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden. Electronic address: said.zeiai@ki.se.
Said
S
Zeiai
Department of Women's and Children's Health, Centre of Molecular Medicine, Karolinska Institutet, Stockholm, Sweden; Department of Paediatric Surgery, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden. Electronic address: magdalena.fossum@ki.se.
Magdalena
M
Fossum
Division of Polymer Chemistry, A Science for Life Laboratory, Department of Chemistry - Ångström Laboratory, Uppsala University, Uppsala, Sweden. Electronic address: hilborn@kemi.uu.se.
Jöns G
JG
Hilborn
D000818:Animals; D002478:Cells, Cultured; D003094:Collagen / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry*; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D012038:Regeneration; D013552:Swine; D013718:Tensile Strength; D023822:Tissue Engineering; D054457:Tissue Scaffolds / Q000737:chemistry*; D001743:Urinary Bladder / Q000166:cytology* / Q000502:physiology; D019459:Urothelium / Q000166:cytology* / Q000502:physiology
D005782:Gels; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D003094:Collagen
Bladder; Collagen; Electrospinning; Minced tissue; PLGA; Plastic compression