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Therapeutic strategy with a membrane-localizing complement regulator to increase the number of usable donor organs
Hetal Patel1, Richard A G Smith, Steven H Sacks
1Department of Nephrology and Transplantation, 5th Floor, Thomas Guy House, Guy's Hospital, London SE1 9RT, UK.
Abstract:
A shortage of donor organs and increasing dependence on marginal grafts with prolonged ischemic times have meant that new methods are needed to prevent postischemic damage. Herein is reported a new strategy aimed to protect donor kidney from complement-mediated postischemic damage and therefore increase the number of successful transplants. Rat donor kidneys were perfused with a membrane-localizing complement regulator derived from human complement receptor type 1 (APT070) and then subjected to prolonged periods of cold storage (at 4 degrees C). A relationship was found between the duration of cold ischemia and the extent of complement-mediated tubule damage and loss of graft function. After 16 h of cold storage, APT070-treated kidneys that were transplanted into syngeneic recipients showed a significant increase in the number of surviving grafts, compared with control-treated grafts (63.6 versus 26.3%). Surviving grafts also displayed less acute tubular injury and better preservation of renal function. These results not only enhance the understanding of the mechanism by which prolonged cold ischemia reduces immediate graft survival but also provide essential information about the effectiveness of membrane-localizing complement regulator with prolonged cold storage. This could lead to more effective strategies for improving the use of severely ischemic donor organs.
Insights
A novel complement regulator (APT070) protected donor kidneys from damage during prolonged cold storage, significantly improving transplant success rates in rats. This strategy enhances the use of marginal donor organs for transplantation.
Area of Science:
- Transplantation immunology
- Organ preservation
- Nephrology
Background:
- Organ shortages necessitate using marginal donor grafts with extended cold ischemia.
- Prolonged cold storage can lead to complement-mediated damage and graft dysfunction.
- New strategies are needed to mitigate post-ischemic injury in transplanted kidneys.
Purpose of the Study:
- To evaluate a membrane-localizing complement regulator (APT070) for protecting donor kidneys from complement-mediated damage during prolonged cold storage.
- To assess the impact of APT070 on graft survival and function after transplantation.
Main Methods:
- Rat donor kidneys were perfused with APT070, a complement regulator derived from human complement receptor type 1.
- Kidneys underwent prolonged cold storage (4°C).
- Transplantation into syngeneic recipients was performed, followed by assessment of graft survival, tubular injury, and renal function.
Main Results:
- A correlation was observed between cold ischemia duration and complement-mediated tubule damage/graft function loss.
- APT070 treatment significantly increased graft survival after 16 hours of cold storage (63.6% vs. 26.3% in controls).
- Surviving APT070-treated grafts showed reduced acute tubular injury and better renal function preservation.
Conclusions:
- Membrane-localizing complement regulators can effectively protect donor kidneys from prolonged cold ischemic injury.
- APT070 improves immediate graft survival and function, offering a promising strategy for utilizing marginal donor organs.
- This research enhances understanding of cold ischemia's impact and provides evidence for improved transplant outcomes.
