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Protection of renal ischemia injury using combination gene silencing of complement 3 and caspase 3 genes
Xiufen Zheng1, Xusheng Zhang, Hongtao Sun
1Department of Surgery, University of Western Ontario, London, Ontario, Canada.
Background:
Ischemia/reperfusion (I/R) injury occurs in clinical kidney transplantation, which results in graft dysfunction and rejection. It has been documented that I/R injury is associated with complement activation and renal cell apoptosis. The purpose of this study was to develop a strategy to prevent I/R injury using small interfering RNA (siRNA) that target complement 3 (C3) and caspase 3 genes.
Methods:
siRNA-expression vectors were constructed to target C3 and caspase 3 genes. Gene silencing efficacy was assessed using real-time polymerase chain reaction. In vivo gene silencing was performed by hydrodynamic injection with C3 and caspase 3 siRNA. Renal I/R injury was induced through clamping the renal vein and artery for 25 min. I/R injury was evaluated using kidney histopathology, blood urea nitrogen (BUN), serum levels of creatinine, and survival.
Results:
Effective gene silencing was first confirmed in vitro. Notably upregulated expression of C3 and caspase 3 genes was observed from 2 to 48 hr after I/R injury, which were effectively and specifically inhibited by C3 and caspase 3 siRNA. In comparison with control mice, serum levels of creatinine and BUN were also significantly decreased in C3 and caspase 3 siRNA-treated mice. Furthermore, the therapeutic effect of siRNA was assessed in a severe, lethal I/R injury experiment, in which siRNA treatment significantly reduced mortality. Tissue histopathology showed an overall reduction in injury area in siRNA-treated mice.
Conclusions:
This is the first demonstration that renal I/R injury can be prevented through silencing the complement gene and apoptosis gene, highlighting the potential for siRNA-based clinical therapy.
Insights
This study shows that small interfering RNA (siRNA) targeting complement 3 (C3) and caspase 3 genes can prevent kidney ischemia/reperfusion (I/R) injury. This approach reduced graft damage and improved survival in preclinical models, offering a potential new therapy.
Area of Science:
- Nephrology
- Immunology
- Molecular Biology
Background:
- Kidney ischemia/reperfusion (I/R) injury is a major cause of graft dysfunction and rejection in kidney transplantation.
- I/R injury is linked to complement system activation and programmed cell death (apoptosis) in renal cells.
Purpose of the Study:
- To develop a novel strategy to prevent kidney I/R injury using small interfering RNA (siRNA).
- To target and silence the expression of complement 3 (C3) and caspase 3 genes, which are implicated in I/R injury.
Main Methods:
- Constructed siRNA-expression vectors targeting C3 and caspase 3 genes.
- Validated gene silencing efficacy in vitro and in vivo using hydrodynamic injection.
- Induced renal I/R injury in mice by clamping renal vessels and evaluated outcomes via histopathology, blood urea nitrogen (BUN), creatinine levels, and survival rates.
Main Results:
- Confirmed effective in vitro gene silencing of C3 and caspase 3.
- Observed significant reduction in upregulated C3 and caspase 3 gene expression post-I/R injury following siRNA treatment.
- Demonstrated decreased serum creatinine and BUN levels, reduced kidney injury area, and significantly lower mortality rates in siRNA-treated mice compared to controls.
Conclusions:
- This study provides the first evidence that targeting complement and apoptosis genes with siRNA can prevent renal I/R injury.
- Highlights the significant potential of siRNA-based therapies for clinical application in preventing kidney transplant complications.
