Electroporation-mediated gene transfer that targets glomeruli.

Area of Science:

• Nephrology
• Molecular Biology
• Biotechnology

Background:

• Electroporation is used for DNA delivery but often results in localized gene expression.
• Efficient gene transfer into kidney cells, particularly glomerular mesangial cells, remains a challenge.

Purpose of the Study:

• To evaluate the efficiency of intrarenal DNA injection followed by in vivo electroporation for gene transfer into the kidney.
• To compare electroporation with the hemagglutinating virus of Japan (HVJ) liposome method for gene delivery into glomeruli.

Main Methods:

• FITC-labeled oligodeoxynucleotides (FITC-ODN) and expression vectors (beta-galactosidase, luciferase) were injected into the renal artery, followed by electroporation of the kidney.
• Transfection efficiency was assessed by detecting FITC-ODN in glomeruli and measuring reporter gene expression (beta-galactosidase, luciferase).
• Comparison with the HVJ liposome method was performed using a luciferase reporter gene.

Main Results:

• FITC-ODN successfully transferred into all glomeruli, with transfection identified in mesangial cells.
• Beta-galactosidase expression was observed in 75% of glomeruli four days after transfection.
• Electroporation demonstrated higher glomerular luciferase activity compared to the HVJ liposome method.
• Co-transfection with Epstein-Barr virus nuclear antigen expression vector enhanced gene expression eightfold.
• No significant histologic damage was observed in renal glomeruli or tubular epithelial cells.

Conclusions:

• Intrarenal gene transfer via renal artery injection combined with electroporation is an effective and simple strategy.
• This method successfully targets glomerular mesangial cells for gene delivery.
• Electroporation offers a promising alternative to existing methods like HVJ liposomes for kidney gene transfer.