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Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases
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Multiple roles of microsomal glutathione transferase 1 in cellular protection: a mechanistic study

Katarina Johansson1, Julia Järvliden, Vladimir Gogvadze

  • 1Division of Biochemical Toxicology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden. katarina.johansson@ki.se

Free Radical Biology & Medicine
|August 24, 2010
PubMed

Insights

Microsomal glutathione transferase 1 (MGST1) enhances cellular resistance to oxidative stress and protects mitochondria. MGST1 offers protection through conjugation and glutathione peroxidase functions, with potential new mechanisms against cisplatin.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Toxicology

Background:

  • Membrane-bound microsomal glutathione transferase 1 (MGST1) is a key enzyme in cellular defense.
  • MGST1 is localized to the endoplasmic reticulum and outer mitochondrial membrane, suggesting roles in organelle protection.
  • Understanding MGST1's function is crucial for combating oxidative stress and drug toxicity.

Purpose of the Study:

  • To investigate the role of MGST1 in cellular resistance against oxidative stress.
  • To elucidate the protective mechanisms employed by MGST1.
  • To assess MGST1's influence on mitochondrial integrity and resistance to specific toxins like cisplatin.

Main Methods:

  • Overexpression of MGST1 in MCF7 cells.
  • Exposure to oxidative stress agents (cumene hydroperoxide, tert-butylhydroperoxide, 4-hydroxy-2-nonenal) and cisplatin.
  • Assessment of protection using vitamin E as a modulator.
  • Measurement of mitochondrial function (calcium loading, respiration).

Main Results:

  • MGST1 overexpression conferred significant protection against lipid peroxidation-inducing agents and a lipid peroxidation end-product.
  • Vitamin E enhanced MGST1's protective effects when oxidative stress was the primary toxic mechanism.
  • Mitochondria in MGST1-overexpressing cells showed improved resistance to oxidative damage.
  • MGST1 conferred resistance to cisplatin, but oxidative stress was not the primary mechanism of cisplatin toxicity in this system.

Conclusions:

  • MGST1 protects cells and mitochondria against oxidative stress via conjugation and glutathione peroxidase activities.
  • MGST1's protective mechanisms are multifaceted and can be modulated by factors like vitamin E.
  • A novel protective mechanism of MGST1 against cisplatin warrants further investigation.

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