Nontransgenic hyperexpression of a complement regulator in donor kidney modulates transplant ischemia/reperfusion...

Area of Science:

• Immunology
• Transplantation Biology
• Biomedical Engineering

Background:

• Complement activation during ischemia and reperfusion (IR) injury significantly impairs transplant outcomes.
• Current strategies to mitigate IR injury have limitations in preventing complement-mediated damage.

Purpose of the Study:

• To develop and evaluate a novel cell-surface-bound complement regulator for protecting donor organs during transplantation.
• To assess the efficacy of this regulator in preventing IR injury and improving graft survival.

Main Methods:

• Engineered a novel complement regulator stabilized on cell surfaces for delivery into donor organs.
• Applied the construct to donor kidneys and evaluated protection against IR injury post-transplantation.
• Assessed complement deposition, histological damage, graft performance, and immune response in allograft recipients.

Main Results:

• The cell-surface complement regulator effectively protected transplanted kidneys from IR injury.
• Reduced deposition of activated complement and histological damage compared to controls.
• Improved short- and long-term graft performance and modulated the host alloresponse.
• Demonstrated feasibility of targeting endothelial and epithelial surfaces in human kidneys.

Conclusions:

• Cell-surface complement regulation is a promising strategy to mitigate IR injury in transplantation.
• This approach reduces graft damage, enhances graft survival, and modulates immune responses.
• The technology shows potential for clinical application in transplantation.