Successful biolistic transformation of mouse pancreatic islets while preserving cellular function

Area of Science:

• Cell Biology
• Gene Therapy
• Transplantation Immunology

Background:

• Efficient gene transfer into pancreatic islets is crucial for gene therapy applications in transplantation.
• Existing methods like lipofection and viral vectors have limitations in islet transfection.

Purpose of the Study:

• To evaluate the biolistic method for efficient gene transfection of intact pancreatic islets.
• To compare biolistic transfection with lipofection and adenoviral infection.
• To assess the functional viability and therapeutic potential of biolistically transfected islets.

Main Methods:

• Comparison of biolistic, lipofection, and adenoviral transfection methods in mouse islets using luciferase reporter gene.
• Assessment of islet recovery and gene expression using beta-galactosidase reporter.
• In vitro glucose challenge assays to evaluate insulin release.
• In vivo transplantation of biolistically transfected islets into diabetic mice.

Main Results:

• Biolistic transfection yielded significantly higher luciferase activity (35-fold) compared to lipofection.
• Adenoviral infection showed the highest luciferase activity, surpassing biolistic transfection (25-fold).
• Islet recovery after biolistic transfection was 53%, with 3% of dissociated cells expressing the gene.
• Biolistically transfected islets maintained glucose-responsive insulin release and reversed diabetes upon transplantation.

Conclusions:

• The biolistic method provides efficient gene transfection of pancreatic islets while preserving their function.
• This technique holds promise for ex vivo gene therapy of islets prior to transplantation.
• Biolistic transfection is a viable strategy for enhancing islet cell function for therapeutic purposes.