Medial Expression of TNF-α and TNF Receptors Precedes the Development of Atherosclerotic Lesions in Apolipoprotein E/LDL Receptor Double Knockout Mice

Research output: Contribution to journalArticle

Abstract

TNF-α is present in atherosclerotic lesions, activates endothelial adhesion molecule expression, stimulates the release of proinflammatory cytokines and matrix metalloproteinases and promotes smooth muscle cell proliferation and migration. Taken together these observations suggest that TNF-α may be functionally involved in early atherosclerosis development. To further evaluate this hypothesis we compared vascular TNF-α and TNF receptor expression in atherosclerosis-susceptible apoE-/-/LDL receptor-/- mice and control C57BL/6 mice. The aortas of 8 week old apoE-/-/LDLreceptor-/- mice displayed immunoreactivity for TNF-α as well as TNF p55 and p75 receptors (2.1 ± 1.6%, 5.6 ± 1.5% and 3.6 ± 1.3% of total media area, respectively), but did not have any detectable lesions. A marginal increase in TNF-α and TNF receptor immunoreactivity was observed at 12 weeks and atherosclerotic plaques were detected in 1 out of 5 animals. At 16 weeks TNF-α expression in the media was increased more than four-fold as compared with 8 week old mice, and atherosclerosis was widespread. TNF-α immunoreactivity was also observed in all plaques. In addition, at the same age a tendency towards increased TNF-α mRNA levels was detected in the double knockout mice compared to age-matched controls. A further increase in TNF-α and TNF receptor immunoreactivity as well as plaque size was observed at 20 weeks. With only a few exceptions, no TNF-α or TNF receptor immunoreactivity was detected in C57BL/6 control mice. These findings demonstrate that medial TNF-α and TNF receptor expression precedes lesion formation in apoE-/-/LDL receptor-/- mice.

Details

Authors
  • Audrey Niemann-Jönsson
  • Ingrid Söderberg
  • Marie Lindholm
  • Stefan Jovinge
  • Jan Nilsson
  • Gunilla Nordin Fredrikson
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cardiac and Cardiovascular Systems
  • Cell and Molecular Biology

Keywords

  • TNF-α, TNF receptors, atherosclerosis, lipoproteins
Original languageEnglish
Pages (from-to)117-123
JournalInternational Journal of Biomedical Science
Volume3
Issue number2
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Experimental Cardiovascular Research Unit (013242110), Hematopoietic Stem Cell Laboratory (013022012)