High throughput RNAi assay optimization using adherent cell cytometry.

Area of Science:

• Biotechnology
• Molecular Biology
• Gene Therapy

Background:

• Small interfering RNA (siRNA) holds promise for vascular disease gene therapy.
• Optimizing RNA interference (RNAi) experiments can be lengthy due to reagent and cell type variability.
• Adherent cell cytometry offers a rapid method for siRNA transfection optimization.

Purpose of the Study:

• To optimize siRNA transfection in human aortic vascular smooth muscle cells (AoSMC) using adherent cell cytometry.
• To evaluate different transfection reagents and siRNA concentrations for efficient delivery.
• To demonstrate the utility of adherent cell cytometry as a high-throughput screening tool.

Main Methods:

• AoSMC were cultured in 96-well plates and transfected with labeled siRNA (siGLO Red) using various reagents (HiPerfect, Lipofectamine RNAiMax).
• Cell counting was performed using Hoechst nuclei stain or Cell Tracker green.
• Adherent cell cytometry (Celigo®) was employed for data acquisition and analysis, normalizing red fluorescence to cell count.

Main Results:

• No significant cell loss was observed across different transfection conditions.
• Lipofectamine RNAiMax demonstrated superior potency compared to HiPerfect or no reagent at both 5 nM and 50 nM siGLO Red concentrations.
• Fluorescence data correlated with gene knockdown efficiency, as evidenced by MARCKS-targeting siRNA experiments.

Conclusions:

• The choice of delivery method significantly impacts RNAi efficiency.
• Adherent cell cytometry serves as an effective high-throughput screening tool for optimizing RNAi assays.
• This approach accelerates in vitro cell assays, leading to reduced research costs and faster development timelines.