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High-Density Lipoprotein-Specific Phospholipid Efflux Assay
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Assaying Low-Density-Lipoprotein (LDL) Uptake into Cells.

Anke Loregger1, Jessica K Nelson2, Noam Zelcer3

  • 1Department of Medical Biochemistry, Academic Medical Center, University of Amsterdam, Meibergdreef 15, Amsterdam, 1105AZ, The Netherlands. a.loregger@amc.uva.nl.

Methods in Molecular Biology (Clifton, N.J.)
|February 17, 2017
PubMed
Summary

This study describes a method for measuring how cells take up low-density lipoprotein (LDL), a type of cholesterol. The method uses fluorescent labeling to track LDL uptake in both adherent and non-adherent cells. Researchers can use this protocol to study how genetic or pharmacological changes affect LDL uptake. The method includes both quantitative and non-quantitative approaches, making it flexible for different experimental needs. The procedure is standardized, allowing for consistent results across various cell types. This provides a valuable tool for studying cholesterol metabolism and related processes.

Keywords:
Cholesterol metabolismEndocytosisLDLLDLRLDL uptake assayfluorescent labelingcholesterol metabolismcell uptake methods

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Area of Science:

  • Cell biology
  • Lipid metabolism
  • Biomedical assays

Background:

Understanding how cells take up low-density lipoprotein (LDL) is essential for studying cholesterol metabolism. Prior research has shown that LDL uptake is a key process in lipid homeostasis. However, no prior work had resolved the best methods for measuring this process in various cell types. Existing techniques often lack precision or fail to account for different cell types. Adherent and non-adherent cells may behave differently in LDL uptake assays. Genetic and pharmacological factors can also influence this process. This gap motivated the need for a standardized and adaptable method. The current paper introduces a new approach to fluorescently label LDL and assess its uptake in cells.

Purpose Of The Study:

The goal of this work is to provide a detailed protocol for assaying LDL uptake in cells. This includes both quantitative and non-quantitative methods. The authors aim to make the procedure accessible for a wide range of cell types. They also want to allow for the study of how genetic or pharmacological changes affect LDL uptake. The method should be flexible enough for different experimental setups. The protocol includes steps for labeling LDL with fluorescent markers. This allows for both visual and quantitative analysis of uptake. The study addresses a need for standardized methods in this field.

Main Methods:

The procedure begins with the preparation of LDL particles. These particles are labeled using fluorescent dyes. The labeled LDL is then introduced to cultured cells. Both adherent and non-adherent cells are tested in the assays. Quantitative methods involve measuring the fluorescence intensity in cells. Non-quantitative methods rely on visual inspection of fluorescence. The protocol includes steps for washing and fixing the cells after uptake. This ensures accurate and reproducible results across different experiments.

Main Results:

The method successfully labels LDL particles with fluorescent markers. The labeled LDL is taken up by cells in a measurable way. Both quantitative and non-quantitative methods show consistent results. The fluorescence intensity correlates with the amount of LDL taken up. The protocol works for both adherent and non-adherent cells. Genetic and pharmacological changes can be tested using this method. The procedure allows for high reproducibility across different cell types. This makes it a valuable tool for studying LDL uptake in various contexts.

Conclusions:

The described method provides a reliable way to assess LDL uptake in cells. It allows for both quantitative and non-quantitative analysis. The protocol is adaptable to different cell types and experimental conditions. The use of fluorescent labeling enables precise measurement of uptake. The method supports studies on how genetic or pharmacological changes affect LDL uptake. It offers a standardized approach for researchers in this field. The procedure is suitable for both adherent and non-adherent cells. This makes it a versatile tool for studying cholesterol metabolism.

The main outcome is the ability to measure how much LDL is taken up by cells using fluorescent labeling.

Fluorescent labeling allows for both visual and quantitative analysis of LDL uptake in cells.

Yes, the protocol is designed to work with both adherent and non-adherent cell types.

Fluorescence intensity correlates with the amount of LDL taken up by the cells.

The method allows researchers to test how these changes affect LDL uptake in cells.

It ensures reproducibility and adaptability across different cell types and experimental conditions.