Age-associated increase in PGE2 synthesis and COX activity in murine macrophages is reversed by vitamin E

Dayong Wu, Casilda Mura, Alison A. Beharka, Sung Nim Han, K. Eric Paulson, Daniel Hwang, Simin Nikbin Meydani

Research output: Contribution to journalArticlepeer-review

146 Scopus citations


We previously showed that increased macrophage and PGE2 production with age is due to enhanced cyclooxygenase (COX) activity and COX-2 expression. This study determined the effect of vitamin E supplementation on macrophage PGE2 synthesis in young and old mice and its underlying mechanism. Mice were fed 30 or 500 parts per million vitamin E for 30 days. Lipopolysaccharide (LPS)stimulated macrophages from old mice produced significantly more PGE2 than those from young mice. Vitamin E supplementation reversed the increased PGE2 production in old mice but had no effect on macrophage PGE2 production in young mice. In both LPS-stimulated and unstimulated macrophages, COX activity was significantly higher in old than in young mice at all intervals. Vitamin E supplementation completely reversed the increased COX activity in old mice to levels comparable to those of young mice but had no effect on macrophage COX activity of young mice or on COX-1 and COX-2 protein or COX-2 mRNA expression in young or old mice. Thus vitamin E reverses the age- associated increase in macrophage PGE2 production and COX activity. Vitamin E exerts its effect posttranslationally, by inhibiting COX activity.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Cell Physiology
Issue number3 44-3
StatePublished - 1998
Externally publishedYes


  • Aging
  • Cyclooxygenase
  • Immune function
  • Prostaglandins

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Cell Biology
  • Physiology
  • Physiology (medical)


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