First siRNA library screening in hard-to-transfect HUVEC cells

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• Effective target gene identification via RNA interference (RNAi) relies on biologically relevant cell types and efficient small interfering RNA (siRNA) delivery.
• Primary cells are often difficult to transfect, limiting their use in RNAi screening.
• Previous methods restricted RNAi screening to cell types amenable to lipid-mediated transfection.

Purpose of the Study:

• To evaluate the Amaxa Nucleofector 96-well Shuttle System for siRNA screening in primary cells.
• To identify genes crucial for the viability of Human Umbilical Vein Endothelial Cells (HUVECs) using siRNA libraries.
• To demonstrate the system's capability for gene target identification in previously difficult-to-transfect primary cells.

Main Methods:

• Utilized the Amaxa Nucleofector 96-well Shuttle System for transfecting primary HUVECs.
• Employed Thermo Scientific Dharmacon siGENOME siRNA Libraries targeting protein kinases and cell cycle genes.
• Screened for genes affecting cell viability, proliferation, and cell death.

Main Results:

• Identified 37 primary hits affecting HUVEC viability.
• Down-regulation of 33 genes reduced proliferation or increased cell death.
• Validated four key genes (COPB2, PYCS, CDK4, MYC) influencing HUVEC proliferation and survival.

Conclusions:

• The Nucleofector 96-well Shuttle System facilitates efficient siRNA delivery into primary cells, including those previously considered difficult to transfect.
• This technology expands the range of cell types available for RNAi-based target gene identification and validation.
• Gene target discovery can now be performed in a broader spectrum of primary cells, overcoming limitations of lipid-mediated transfection.