Cigarette smoke condensate and dioxin suppress culture shock induced senescence in normal human oral keratinocytes

Oral Oncol. 2007 Aug;43(7):693-700. doi: 10.1016/j.oraloncology.2006.08.008. Epub 2006 Oct 25.

Abstract

The aryl hydrocarbon receptor is a ligand activated transcription factor which regulates biological responses to a variety of environmental pollutants, such as dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD) and cigarette smoke. The purpose of this study was to determine whether cigarette smoke condensate (CSC) is capable of activating the AHR in normal human oral keratinocytes (NHOK) and inhibiting their ability to senesce. Towards this end, NHOK were isolated from human subjects and were cultured in the presence or absence of either TCDD or CSC. While neither TCDD nor CSC treatments altered the lifespan of NHOK in culture, both were capable of suppressing a culture induced premature senescence as indicated by their ability to decrease the mRNA and protein levels of the senescence markers p16(INK4a), p53 and p15(INK4b). A role of the AHR in mediating these events is indicated by the observations that the TCDD and CSC-induced decreases in p15(INK4b), p16(INK4a) and p53 expression was accompanied by a corresponding increase in the expression levels of the AHR target gene, CYP1A1. In addition, cotreatment with the AHR antagonist, 3'-methoxy-4'-nitroflavone (MNF) blocked the effects of TCDD and CSC on p53 and CYP1A1 expression. The findings of this study indicate that in NHOK, CSC is capable of altering a key cell fate decision, i.e., commitment to premature senescence, that is in part, dependent on the AHR. These results support the idea that progression of CSC-induced tumorigenesis may include an AHR-mediated inhibition of senescence that contributes to immortalization and agents that block the actions of the AHR may be effective components of novel cancer therapeutics.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Blotting, Western
  • Cells, Cultured
  • Cellular Senescence / drug effects*
  • Cyclin-Dependent Kinase Inhibitor p15 / drug effects
  • Cytochrome P-450 CYP1A1 / drug effects
  • Environmental Pollutants / toxicity
  • Gene Expression / drug effects
  • Genes, p16 / drug effects
  • Genes, p53 / drug effects
  • Humans
  • Keratinocytes / drug effects*
  • Mouth Mucosa / drug effects*
  • Polychlorinated Dibenzodioxins / toxicity
  • RNA, Messenger / analysis
  • Receptors, Aryl Hydrocarbon / drug effects
  • Receptors, Aryl Hydrocarbon / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Smoke / adverse effects*
  • Tobacco / toxicity*

Substances

  • Cyclin-Dependent Kinase Inhibitor p15
  • Environmental Pollutants
  • Polychlorinated Dibenzodioxins
  • RNA, Messenger
  • Receptors, Aryl Hydrocarbon
  • Smoke
  • Cytochrome P-450 CYP1A1