Archives of Toxicology

, Volume 81, Issue 8, pp 533–544

Differential role of epigenetic modulators in malignant and normal stem cells: a novel tool in preclinical in vitro toxicology and clinical therapy

  • Sarah Snykers
  • Mathieu Vinken
  • Vera Rogiers
  • Tamara Vanhaecke
Review Article

DOI: 10.1007/s00204-007-0195-4

Cite this article as:
Snykers, S., Vinken, M., Rogiers, V. et al. Arch Toxicol (2007) 81: 533. doi:10.1007/s00204-007-0195-4

Abstract

Adult stem cells are primitive cells that undergo asymmetric division, thereby giving rise to one clonogenic, self-renewing cell and one cell able to undergo multipotent differentiation. Disturbance of this controlled process by epigenetic alterations, including imbalance of histone acetylation/histone deacetylation and DNA methylation/demethylation, may result in uncontrolled growth, formation of self-renewing malignant stem cells and eventually cancer. In view of this notion, several epigenetic modulators, in particular those with histone deacetylase inhibiting activity, are currently being tested in phase I and II clinical trials for their promising chemotherapeutic properties in cancer therapy. As chromatin modulation is also involved in regulation of differentiation, normal development, embryonic and adult stem cell functions and maintenance of their plasticity during embryonic organogenesis, the question can be raised whether predestined cell fate can be modified through epigenetic interference. And if so, could this strategy enforce adult stem cells to differentiate into different types of functional cells? In particular, functional hepatocytes seem important for preclinical toxicity screening of candidate drugs. This paper reviews the potential use and relevance of epigenetic modifiers, including inhibitors of histone deacetylases and DNA methyltransferases (1) to change cell fate and ‘trans’differentiate normal adult stem cells into hepatocyte-like cells and (2) to cure disorders, caused by uncontrolled growth of malignant stem cells.

Keywords

Epigenetic modificationMalignant and normal stem cellsCell fateHepatocytesCancer

Abbreviations

AzaC

decitabine, 5-Aza-2′-deoxycytidine

C/EBP

CCAAT enhancer binding protein

CYP

Cytochrome P450

DMSO

Dimethylsulphoxide

DNMT

DNA methyltransferases

ES

Embryonic stem cells

HSC

Haematopoietic stem cells

HNF

Hepatocyte nuclear factor

HAT(s)

Histone acetyltransferase(s)

HDAC(s)

Histone deacetylase(s)

LETFs

Liver-enriched transcription factors

MSC

Mesenchymal stem cells

NCEs

New chemical entities

TSA

Trichostatin A

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Sarah Snykers
    • 1
  • Mathieu Vinken
    • 1
  • Vera Rogiers
    • 1
  • Tamara Vanhaecke
    • 1
  1. 1.Department of ToxicologyVrije Universiteit BrusselBrusselsBelgium