Experimental replacement of various bladder volumes with allogeneic tissue-engineered constructions

Abstract

The results of experimental replacement of the bladder wall up to subtotal using multicomponent tissue-engineered structures are presented. Purpose. Development and experimental use of a tissue-engineered structure for replacing various volumes of the bladder wall. Material and methods. The original poly-L,L-lactide matrix is reinforced with silk fibroin. Mesenchymal cells were introduced into the constructs. 6 intact animals underwent filling cystometry. The maximum cystometric capacity was 11.2±0.97 ml. In these same 6 animals, the anesthetic capacity of the bladder was measured, which was 23.83±0.71 ml. 36 animals underwent reconstruction of the bladder using a prepared tissue-engineered construct after resection of the corresponding volume of the organ. Groups of 9 animals received bladder volumes of 5, 10, 15 and 20 ml. The observation period was 3 months. Results: According to computed tomography of the abdominal and pelvic organs (native study and with intravesical administration of a radiocontrast agent), 4, 8, 12 weeks after surgery, a bladder of physiological capacity is determined in all study groups, the implanted structure is visualized as a hyperintense signal in area of the apex of the bladder. no leakage of contrast agent is detected. Filling cystometry in 2 animals that underwent replacement of 20 ml of bladder volume (subtotal replacement) after 12 weeks showed that the capacity of the formed reservoir correlates with preoperative parameters. Macroscopically, the anastomosis zone is consistent in all groups of animals, the tissue-engineered structure is determined at the implantation site, lysis of the structure is noted by 12 weeks of observation with the preservation of small residual fragments at the implantation site. Conclusion. The experimental use of the developed tissue-engineered multicomponent structure turned out to be effective for replacing defects of the bladder wall of various volumes up to subtotal reconstruction. Further study of technologies for the use of tissue-engineered allogeneic constructs can significantly improve the results of treatment of urological pathologies for which obtaining autologous material is not possible.