NBD-lipid Uptake Assay for Mammalian Cell Lines

Area of Science:

• Cell Biology
• Biochemistry
• Molecular Biology

Background:

• Eukaryotic cells utilize transmembrane lipid transporters for essential functions like maintaining membrane lipid asymmetry, vesicular transport, and fusion.
• Defects in these transporters are linked to human diseases, underscoring their critical role in cellular homeostasis.
• Despite their importance, many aspects of lipid transporter activity, substrate specificity, and regulation remain poorly understood.

Purpose of the Study:

• To develop and optimize a quantitative flow cytometry assay for studying lipid transporter activity at the plasma membrane.
• To characterize lipid internalization in mammalian cell lines using fluorescently labeled lipids.
• To provide a robust method for investigating lipid transport dynamics and the impact of genetic modifications.

Main Methods:

• Utilized quantitative flow cytometry combined with nitrobenzoxadiazolyl (NBD) fluorescent lipids.
• Developed a lipid uptake assay to measure internalization at the plasma membrane of mammalian cells.
• Applied the assay to analyze large cell populations for reduced sampling variability.

Main Results:

• The assay allows for rapid and quantitative characterization of lipid transporter activities.
• Demonstrated the ability to study lipid internalization in various mammalian cell lines.
• Showcased the potential to assess the effects of gene knockouts on plasma membrane lipid transport.

Conclusions:

• The developed assay is a powerful tool for dissecting lipid transporter function in mammalian cells.
• This method facilitates the study of lipid dynamics at the plasma membrane and aids in understanding disease mechanisms.
• The protocol offers a versatile approach for investigating lipid transport mechanisms and regulation.