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Related Experiment Video

Updated: Oct 1, 2025

High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay
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A Fluorescence-Based In Vitro Method to Assess Cholesterol Efflux.

Sara Fernández-Castillejo1, Anna Pedret2, Úrsula Catalán Santos3

  • 1Facultat de Medicina i Ciències de la Salut, Departament de Medicina i Cirurgia, Grup Nutrició Funcional, Oxidació i Malalties Cardiovasculars (NFOC-Salut), Universitat Rovira i Virgili, Reus, Spain. sara.fernandez@urv.cat.

Methods in Molecular Biology (Clifton, N.J.)
|March 3, 2022
PubMed
Summary

Cholesterol efflux (ChE) capacity is a key cardiovascular risk factor. A new, reproducible, nonradioactive fluorescent method using BODIPY-cholesterol offers a safe alternative for assessing ChE in vitro.

Keywords:
AtherosclerosisBODIPYCholesterol effluxFluorescentMacrophagesNonradioactiveReverse cholesterol transport

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Last Updated: Oct 1, 2025

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Area of Science:

  • Biochemistry
  • Cardiovascular Science
  • Cell Biology

Background:

  • Cholesterol efflux (ChE) capacity is linked to cardiovascular events and emerging as a risk factor.
  • Traditional in vitro radioactive methods for ChE assessment are unsuitable for large sample sizes.
  • Development of nonradioactive, reproducible methods is crucial for efficient ChE evaluation.

Purpose of the Study:

  • To describe a robust, nonradioactive method for in vitro assessment of cholesterol efflux capacity.
  • To present a fluorescent tracer-based assay as a safe and reproducible alternative to radioactive methods.
  • To validate the utility of the BODIPY-cholesterol assay for evaluating ChE.

Main Methods:

  • Utilized murine macrophage J774A.1 cells labeled with fluorescent BODIPY-cholesterol.
  • Employed various cholesterol acceptors: lipid-free apolipoprotein (ApoA)-1, HDL subfractions, serum, and plasma.
  • Investigated ChE pathways involving ABCA1, ABCG1, and SRB1 transporters.

Main Results:

  • The BODIPY-cholesterol assay demonstrated excellent reproducibility.
  • Intra-assay coefficients of variation (CVs) were below 10% with 30 replicates.
  • Inter-assay CVs were below 14% across multiple experimental days.

Conclusions:

  • The fluorescent BODIPY-cholesterol method is a reproducible, safe, and effective tool for in vitro ChE assessment.
  • This assay is suitable for evaluating cholesterol efflux capacity as an emerging cardiovascular risk factor.
  • The method facilitates large-scale sample analysis, overcoming limitations of traditional radioactive assays.