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Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Cellular cholesterol efflux and cholesterol loading capacity of serum: effects of LDL-apheresis

M P Adorni1, F Zimetti1, M Puntoni2

  • 1Department of Pharmacological and Biological Sciences and Applied Chemistries, University of Parma, Parma, Italy.

Journal of Lipid Research
|March 15, 2012
PubMed

Insights

LDL-apheresis lowers LDL-cholesterol but temporarily reduces HDL levels and cholesterol efflux capacity. However, it also decreases macrophage cholesterol loading, potentially preventing foam cell formation in hyperlipidemia patients.

Area of Science:

  • Cardiovascular Medicine
  • Lipid Metabolism
  • Atherosclerosis Research

Background:

  • Familial hypercholesterolemia (FH) and familial combined hyperlipidemia (FCH) are characterized by high LDL-cholesterol (LDL-C).
  • LDL-apheresis is a treatment to reduce LDL-C in these patients.
  • LDL-apheresis can impact HDL levels and functionality.

Purpose of the Study:

  • To investigate the effects of LDL-apheresis on serum cholesterol efflux capacity (CEC) and macrophage cholesterol loading capacity (CLC).
  • To assess HDL functionality post-LDL-apheresis in FH and FCH patients.

Main Methods:

  • Serum CEC and CLC were measured before, immediately after, and two days after LDL-apheresis in FH and FCH subjects.
  • Evaluated specific CEC pathways including aqueous diffusion (AD), SR-BI, and ABCA1.
  • Measured plasma levels of TC, LDL-C, apoB, HDL-C, and apoA-I.

Main Results:

  • LDL-apheresis significantly reduced TC, LDL-C, and apoB levels.
  • HDL-C and apoA-I levels were transiently reduced post-procedure but restored within two days.
  • Serum CEC (AD, SR-BI, ABCA1) was reduced, with ABCA1-CEC remaining low.
  • Serum CLC was reduced immediately and two days after LDL-apheresis.

Conclusions:

  • LDL-apheresis temporarily decreases HDL-C and serum CEC.
  • The procedure also reduces the serum's capacity to deliver cholesterol to macrophages.
  • Despite transient negative effects on HDL, LDL-apheresis may inhibit foam cell formation.

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