Normalized neutral lipid quantitation by flow cytometry

Area of Science:

• Biochemistry
• Cell Biology
• Metabolic Disease Research

Background:

• Measuring tissue lipids is crucial for understanding metabolic diseases.
• Current methods for assessing cellular lipid levels, like flow cytometry, have limitations in inter-sample comparisons.
• Linking specific cell types to disease pathogenesis requires precise lipid quantification within heterogeneous tissues.

Purpose of the Study:

• To develop a flow cytometry-based method for quantifying cellular lipid levels.
• To enable the estimation of triacylglycerol (TG) mass in mixed cell populations.
• To overcome limitations of existing techniques for lipid analysis in specific cell types.

Main Methods:

• Utilizing lipophilic fluorophore staining for flow cytometry analysis.
• Establishing a calibration curve where fluorescence intensity correlates linearly with lipid levels.
• Normalizing fluorescence intensity to control conditions to reduce experiment-to-experiment variation.

Main Results:

• Fluorescence intensity in stained cells accurately reflects cellular lipid content.
• The method allows for lipid level assessment in mixed cell populations.
• Triacylglycerol (TG) mass can be estimated in specific cell populations within a mixture.
• Confirmed perilipin 1 (PLIN1) enhances TG accumulation in Huh7 cells.

Conclusions:

• Flow cytometry offers a robust method for quantifying cellular lipid levels and estimating TG mass.
• This technique facilitates lipid analysis in challenging cell populations, such as human blood monocytes.
• The developed method addresses limitations in biochemical assays for TG in low-cell-number or isolated populations.