Activation versus inhibition of microsomal glutathione S-transferase activity by acrolein. Dependence on the concentration and time of acrolein exposure

Mireille M. J. P. E. Sthijns, Gertjan J. M. den Hartog, Caterina Scasso, Jan P. Haenen, Aalt Bast, Guido R. M. M. Haenen*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Web of Science)

Abstract

The toxicity of acrolein, an alpha, beta-unsaturated aldehyde, is due to its soft electrophilic nature and primarily involves the adduction of protein thiols. The thiol glutathione (GSH) forms the first line of defense against acrolein. The present study confirms that acrolein added to isolated rat liver microsomes can increase microsomal GSH transferase (MGST) activity 2-3 fold, which can be seen as a direct adaptive increase in the protection against acrolein. At a relatively high exposure level, acrolein appeared to inhibit MGST. The activation is due to adduction of thiol groups, and the inactivation probably involves adduction of amino groups in the enzyme by acrolein. The preference of acrolein to react with thiol groups over amino groups can explain why the enzyme is activated at a low exposure level and inhibited at a high exposure level of acrolein. These opposite forms of direct adaptation on the level of enzyme activity further narrow the thin line between survival and promotion of cell death, governed by the level of exposure. (C) 2017 The Authors. Published by Elsevier Ireland Ltd.

Original languageEnglish
Pages (from-to)116-120
Number of pages5
JournalChemico-Biological Interactions
Volume275
DOIs
Publication statusPublished - 25 Sep 2017

Keywords

  • Acrolein
  • Adaptation
  • Glutathione
  • Microsomal GSH S-transferase
  • LIPID-PEROXIDATION
  • PROTECTION
  • MECHANISM

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