Oxidative Injury Rapidly Activates the Heat Shock Transcription Factor but Fails to Increase Levels of Heat Shock Proteins

Jacqueline L. Bruce, Brendan D. Price, C. Norman Coleman, Stuart K. Calderwood

Research output: Contribution to journalArticle

Abstract

When cells are exposed to heat shock, heavy metals, amino acid analogues, and other stresses, the heat shock transcription factor (HSF) is activated. The HSF then binds to the promoter of the heat shock genes, stimulating transcription of the heat shock proteins. Here, we demonstrate that exposure of NIH-3T3 cells to oxidants (H2O2 or menadione) also causes activation of the HSF. This activation is not blocked by inhibitors of protein synthesis (cycloheximide) or by inhibitors of protein kinases (2-aminopurine or genistein). In addition, the oxidant activated HSF is located in the nucleus of the cells. However, oxidant activation of the HSF does not result in the accumulation of hsp70 mRNA or of heat shock proteins. This is in contrast to the accumulation of heat shock proteins seen after heat shock activation of the HSF. This suggests that oxidant induced activation of HSF binding may have a function different from that of heat induced activation of HSF binding.

Original languageEnglish (US)
Pages (from-to)12-15
Number of pages4
JournalCancer Research
Volume53
Issue number1
StatePublished - Jan 1993

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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