Induction of heme oxygenase-1 modulates cis-aconitase activity in lens epithelial cells

Danuta M. Rzymkiewicz, John R. Reddan, Usha P. Andley

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Heme oxygenase-1 is the heme catabolic enzyme induced in human dermal fibroblasts by environmental stress. We report an increase of heme oxygenase-1 message in lens epithelial cells after exposure to UVA radiation, followed by a 10-fold increase of protein expression. The size of message was larger than previously demonstrated for fibroblasts. The relationship between heme oxygenase-1 activation and iron metabolism was investigated by measurement of activities of both cytosolic and mitochondrial cis-aconitase enzymes. A 2-fold increase in mitochondrial cis-aconitase activity in UVA-exposed cells coincided with the time of maximal heme oxygenase-1 expression. We propose that modulation of cis-aconitase activity at the translational level by an increase of cellular iron is an important consequence of heme oxygenase-1 activation. This might be a novel aspect of the protective role of heme oxygenase-1 in modulating the response of cells challenged with oxidative stress. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)324-328
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number1
StatePublished - Apr 2 2000


  • Heme oxygenase-1
  • Lens epithelial cells
  • UVA radiation
  • cis-aconitase


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