TNF-α interferes with lipid homeostasis and activates acute and proatherogenic processes

Klementina Fon Tacer, Drago Kuzman, Matej Seliškar, Denis Pompon, Damjana Rozman

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

The interaction between disrupted lipid homeostasis and immune response is implicated in the pathogenesis of several diseases, but the molecular bridges between the major players are still a matter of controversy. Our systemic study of the inflammatory cytokine tumor necrosis factor-alpha (TNF-α) in the livers of mice exposed to 20-h cytokine/fasting for the first time shows that TNF-α interferes with adaptation to fasting and activates harmful proatherogenic pathways, partially through interaction with the insulin-Insig-sterol regulatory element binding protein (Srebp) signaling pathway. In addition to the increased expression of acute-phase inflammatory genes, the most prominent alterations represent modified lipid homeostasis observed on the gene expression and metabolite levels. These include reduction of HDL-cholesterol, increase of LDL-cholesterol, and elevated expression of cholesterogenic genes, accompanied by increase of potentially harmful precholesterol metabolites and suppression of cholesterol elimination through bile acids, likely by farnesoid X receptor-independent mechanisms. On the transcriptional level, a shift from fatty oxidation toward fatty acid synthesis is observed. The concept of the influence of TNF-α on the Srebp regulatory network, followed by downstream effects on sterol metabolism, is novel. Observed acute alterations in lipid metabolism are in agreement with chronic disturbances found in patients.

Original languageEnglish (US)
Pages (from-to)216-227
Number of pages12
JournalPhysiological Genomics
Volume31
Issue number2
DOIs
StatePublished - Oct 22 2007

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Keywords

  • Acute response
  • Cholesterol
  • Inflammation
  • Transcriptome

ASJC Scopus subject areas

  • Physiology
  • Genetics

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