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Endothelial Chlamydia pneumoniae infection promotes oxidation of LDL

Ralf Dittrich1, Charalampos Dragonas, Andreas Mueller

  • 1University of Erlangen/Nuremberg, Department of Obstetrics and Gynecology, Erlangen, Germany. ralf.dittrich@gyn.imed.uni-erlangen.de

Biochemical and Biophysical Research Communications
|June 5, 2004
PubMed

Insights

Chlamydia pneumoniae infection of endothelial cells releases components that oxidize LDL, promoting atherosclerosis. This chronic infection continuously contributes to lipid metabolism dysregulation, driving disease progression.

Area of Science:

  • Cardiovascular Science
  • Infectious Disease Research
  • Lipid Metabolism

Background:

  • Chlamydia pneumoniae infection is linked to atherosclerosis.
  • The bacterium modifies inflammation, proliferation, and lipid metabolism in monocytes.
  • Endothelial LDL modification is crucial for atherogenesis.

Purpose of the Study:

  • To investigate the impact of endothelial cell infection by C. pneumoniae on LDL oxidation.
  • To determine if C. pneumoniae infection of endothelial cells alters LDL susceptibility to oxidation.

Main Methods:

  • Human umbilical vein endothelial cells (HUVEC) were infected with a C. pneumoniae strain.
  • Lipid peroxidation products in cell supernatants were measured using the thiobarbituric acid reacting substances assay.
  • Copper-ion catalyzed LDL oxidation assays assessed changes in LDL resistance to oxidation.

Main Results:

  • Supernatants from infected HUVEC significantly increased lipid peroxidation products compared to uninfected controls.
  • Supernatants from infected cells rendered human LDL more susceptible to oxidation.
  • LDL resistance against pro-oxidative stimuli was reduced by 16% after exposure to infected cell supernatants.

Conclusions:

  • Acellular components released by C. pneumoniae-infected vascular endothelial cells convert LDL into a proatherogenic form.
  • These components reduce LDL's resistance to oxidation, contributing to atherogenesis.
  • Chronic endothelial chlamydial infections may continuously promote dysregulated lipid metabolism in atherosclerosis.

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