An optimized gene transfection system in WERI-Rb1 cells

Area of Science:

• Ophthalmology
• Molecular Biology
• Gene Therapy

Background:

• Retinoblastoma pathogenesis involves Rb1 gene inactivation, suggesting gene therapy as a potential treatment.
• Effective gene transfer systems are crucial for retinoblastoma gene therapy but have received limited research focus.
• WERI-Rb1 cells (W-RBCs) are a relevant model for studying gene delivery strategies.

Purpose of the Study:

• To optimize a transgene delivery system for WERI-Rb1 cells for potential retinoblastoma gene therapy.
• To compare the efficacy and cytotoxicity of various viral and non-viral vectors for gene transfection.
• To identify optimal cell culture conditions, including serum presence and cell suspension, for enhanced gene delivery.

Main Methods:

• Utilized Green Fluorescent Protein (GFP) as a reporter gene.
• Transfected WERI-Rb1 cells using retroviral vectors, recombinant adeno-associated viruses (rAAV2, rAAV2/1), lentiviruses (LVs), and the non-viral X-treme HP reagent.
• Assessed transfection efficiency via GFP expression and evaluated cytotoxicity using the trypan blue exclusion test.
• Optimized cell culture conditions, including serum presence and suspension vs. adherent culture.

Main Results:

• Recombinant adeno-associated virus serotype 2/1 (rAAV2/1) showed higher GFP expression and lower cytotoxicity than rAAV2.
• Retroviral vectors and X-treme HP reagent demonstrated comparable GFP transfection capacity, but X-treme HP exhibited significantly lower cytotoxicity.
• Suspended cell cultures resulted in higher GFP expression compared to adherent cultures.
• Serum-positive conditions enhanced GFP expression and cell viability, while serum-free conditions led to lower expression and increased cytotoxicity.

Conclusions:

• Retroviral vectors and the X-treme HP reagent are effective for WERI-Rb1 cell gene transfection.
• The X-treme HP reagent is a preferable non-viral vector due to its lower cytotoxicity.
• Suspended cell culture and the presence of serum optimize gene delivery and cell viability for retinoblastoma gene therapy research.