Abstract
This study evaluated the possibility of tracheal reconstruction with allograft, pig-to-rabbit fresh xenograft or use of a tissue-engineered trachea, and compared acute rejection of three different transplanted tracheal segments in rabbits. Eighteen healthy New Zealand White rabbits weighing 2.5–3.1 kg were transplanted with three different types of trachea substitutes. Two rabbits and two alpha 1, 3-galactosyltransferase gene-knockout pigs weighing 5 kg were used as donors. The rabbits were divided into three groups: an allograft control group consisting of rabbit-to-rabbit allotransplantation animals (n = 6), a fresh xenograft group consisting of pig-to-rabbit xenotransplantation animals (n = 6), and an artificial trachea scaffold group (n = 6). All animals were monitored for 4 weeks for anastomotic complications or infection. The recipients were sacrificed at 28 days after surgery and the grafts were evaluated. On bronchoscopy, all of the fresh xenograft group animals showed ischemic and necrotic changes at 28 days after trachea replacement. The allograft rabbits and the tissue-engineered rabbits showed mild mucosal granulation. The levels of interleukin-2 and interferon-γ in the fresh xenograft group were higher than in other groups. Histopathologic examination of the graft in the fresh xenograft rabbits showed ischemic and necrotic changes, including a loss of epithelium, mucosal granulation, and necrosis of cartilaginous rings. The pig-to-rabbit xenografts showed more severe acute rejection within a month than the rabbits with allograft or artificial trachea-mimetic graft. In addition, the artificial tracheal scaffold used in the present experiment is superior to fresh xenograft and may facilitate tracheal reconstruction in the clinical setting.
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Acknowledgements
This work was supported by the Industrial Technology Innovation Program (No.10048358) funded by the Ministry Of Trade, Industry Energy (MI, Korea) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2017R1A6A3A11035222).
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Lee, J.Y., Park, J.H. & Cho, DW. Comparison of tracheal reconstruction with allograft, fresh xenograft and artificial trachea scaffold in a rabbit model. J Artif Organs 21, 325–331 (2018). https://doi.org/10.1007/s10047-018-1045-2
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DOI: https://doi.org/10.1007/s10047-018-1045-2