4-Hydroxynonenal, a product of cellular lipid peroxidation, which modulates c-myc and globin gene expression in K562 erythroleukemic cells

V. M. Fazio, G. Barrera, S. Martinotti, M. G. Farace, B. Giglioni, L. Frati, V. Manzari, M. U. Dianzani

Research output: Contribution to journalArticlepeer-review

Abstract

Several studies point to the existence of an inverse correlation between cellular lipid peroxidation and both cell proliferation and neoplastic transformation. Here, we show that 4-hydroxynonenal (HNE) concentrations close to the level found in normal cells (in the range of 1 and 3 μM) can specifically induce changes in the expression of c-myc and γ-globin mRNA in K562 cells, without inducing any toxic effects or affecting cell viability. Since we have determined that K562 cells have undetectable levels of endogenous lipid peroxidation, all these effects can be assigned to the exogenous HNE treatment. After a 1-h treatment with 1 μM HNE, c-myc mRNA levels decrease transiently during the first 4 h, rebounding later to higher levels, and normalizing to basal expression after 4 days. Run-on experiments show a transient transcriptional block 20 min after HNE treatment and subsequent posttranscriptional regulation. According to S1 mapping, mRNA changes are exerted on c-myc transcripts initiated from both the principal constitutive start sites (P1 and P2). γ-Globin mRNA levels concomitantly increase 3- to 4-fold, but no significant changes of housekeeping gene expression are observed. On the basis of these results it appears that the restoration in human erythroleukemic K562 cells of HNE concentrations closer to the level in normal cells can modulate the expression of specific genes.

Original languageEnglish
Pages (from-to)4866-4871
Number of pages6
JournalCancer Research
Volume52
Issue number18
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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