Curative effect and histocompatibility evaluation of reconstruction of traumatic defect of rabbit urethra using extracellular matrix.
OBJECTIVE
To investigate the curative effect and histocompatibility of reconstruction of traumatic urethral defect of rabbit using urethral extracellular matrix (ECM).


METHODS
Urethral ECM was obtained by excision of the urethra in 20 donor rabbits. In experimental group, 20 rabbits were resected a 1.0 cm-1.5 cm segment of the urethra and artificially made a model of traumatic urethral defect, then reconstructed by the urethral extracellular matrix of the same length. The rabbit immunity response was assessed by lymphocyte transformation test and serum TNF-alpha level. The reconstructed urethral segments were stained with hematoxylin-eosin and Van Gieson stain and observed by histological examination postoperatively. The urethrography, urethroscopy and urodynamic examinations were performed.


RESULTS
There was no significant difference in stimulative index of lymphocyte transformation between ECM group and control group. The serum TNF-alpha levels of ECM group slightly rose, but the increase was not significant as compared with control group. On postoperative day 10, epithelial cell had migrated from each side and small vessels were found in the extracellular matrix. In the 3rd week, several layers of urothelium covered the whole surface of the matrix tube. In the 6th week, the disorganized arrangements of smooth muscle fibers were firstly observed by Van Gieson staining. In the 24th week, the smooth muscle cells increased and the matrix tube appeared fairly similar to normal urethral wall components. The urethroscopy and urodynamic evaluation revealed that the surface of reconstructed urethra was smooth and emiction was unobstructed.


CONCLUSIONS
The urethral extracellular matrix might be an ideal and safe biomaterial for the reconstruction of urethral traumatic defect.
Hu
Yun-fei
YF
Department of Urology, Renmin Hospital of Wuhan University, Wuhan 430060, China. hyf6606@163.com
Yang
Si-xing
SX
Wang
Ling-long
LL
Jin
Hua-min
HM
D000818:Animals; D005109:Extracellular Matrix / Q000276:immunology / Q000502:physiology*; D005260:Female; D007150:Immunohistochemistry; D008213:Lymphocyte Activation; D011817:Rabbits; D019651:Plastic Surgery Procedures / Q000379:methods; D014409:Tumor Necrosis Factor-alpha / Q000097:blood; D014521:Urethra / Q000276:immunology / Q000293:injuries* / Q000601:surgery*
D014409:Tumor Necrosis Factor-alpha