Abstract
Objective
In lung transplantation (LTx) from donation after cardiac death (DCD), the donor lungs are inevitably exposed to warm ischemic time (WIT) between the cardiac arrest and the initiation of cold preservation. We conducted this study to examine the effect of prolonged WIT on lung allograft rejection in a murine model of LTx from DCD.
Methods
Allogeneic BALB/c → B6 LTx from DCD was performed with a WIT of 15 min (WIT15 group, n = 5) or 60 min (WIT60 group, n = 5). Recipients were immunosuppressed by perioperative costimulatory blockade. The lung allografts were analyzed by histology and flow cytometry on day 7 after the LTx.
Results
Histologically, the rejection grade in the WIT60 group was significantly higher than that in the WIT15 group (3.4 ± 0.4 vs. 2.2 ± 0.2, P = 0.0278). Moreover, the intragraft CD8+ to CD4+ T cell ratio in the WIT60 group was significantly higher than that in the WIT15 group (2.3 ± 0.12 vs. 1.2 ± 0.11, P < 0.0001).
Conclusions
Prolonged WIT could exacerbate the severity of lung allograft rejection after LTx from DCD. Minimization of the WIT could improve the outcomes after LTx from DCD.
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Acknowledgements
This study was supported by a Grant-in-Aid for Scientific Research, Grant no. 24791461, from the Japan Society for the Promotion of Science and JSPS Fujita Memorial Fund for Medical Research.
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Yutaka Hirano and his co-authors have no conflicts of interest.
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Hirano, Y., Sugimoto, S., Yamamoto, S. et al. Prolonged warm ischemia exacerbated acute rejection after lung transplantation from donation after cardiac death in a mouse. Gen Thorac Cardiovasc Surg 68, 57–62 (2020). https://doi.org/10.1007/s11748-019-01181-9
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DOI: https://doi.org/10.1007/s11748-019-01181-9