Related Experiment Video

Updated: Jun 25, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Fluoxetine disrupts cholesterol metabolism in endothelial cells via SREBP2 activation

Fabiana Oliveira1,2, Christina Papa1, Tobias Hagemann1

  • 1Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Center Munich, Leipzig, Germany.

Translational Psychiatry
|June 23, 2026
PubMed

Insights

Fluoxetine disrupts lipid and cholesterol metabolism in human endothelial cells, leading to lipid accumulation and endothelial dysfunction. This study reveals new mechanisms linking this antidepressant to cardiovascular risks.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Selective serotonin reuptake inhibitors (SSRIs) like fluoxetine are widely used for depression.
  • Emerging evidence suggests a link between fluoxetine use and increased cardiovascular disease risk.
  • The molecular mechanisms underlying this association are not well understood.

Purpose of the Study:

  • To investigate the effects of fluoxetine on lipid and cholesterol metabolism in human endothelial cells (ECs).
  • To elucidate the cellular mechanisms by which fluoxetine may contribute to endothelial dysfunction.

Main Methods:

  • Primary human endothelial cells (ECs) were treated with fluoxetine.
  • Gene expression analysis of cholesterol metabolism pathways.
  • Measurement of intracellular lipid levels and lipid droplet accumulation.
  • Assessment of low-density lipoprotein (LDL) receptor activity and transcytosis.
  • Analysis of endoplasmic reticulum (ER) morphology and protein translation.
  • Investigation of the role of SREBP2 transcription factor.

Main Results:

  • Fluoxetine upregulated cholesterol metabolism genes and caused lipid droplet accumulation in ECs.
  • Elevated levels of cholesterol esters, ceramides, sphingolipids, and fatty acids were observed.
  • Fluoxetine enhanced cholesterol biosynthesis, LDL uptake, and transcytosis via the LDL receptor.
  • Accumulation of fluoxetine in the ER led to ER expansion and reduced protein translation without inducing ER stress.
  • Fluoxetine activated SREBP2 in an INSIG-dependent manner, promoting LDL receptor upregulation and lipid accumulation.

Conclusions:

  • Fluoxetine disrupts lipid homeostasis in endothelial cells by reprogramming lipid metabolism.
  • The drug activates the SREBP2 pathway, leading to increased cholesterol synthesis and LDL uptake.
  • These metabolic changes contribute to endothelial dysfunction, potentially explaining the increased cardiovascular risk associated with fluoxetine.

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