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Multidrug resistance-associated protein 1 as a major mediator of basal and apoptotic glutathione release

Rosemarie Marchan1, Christine L Hammond, Nazzareno Ballatori

  • 1Department of Environmental Medicine, Box EHSC, University of Rochester School of Medicine, 575 Elmwood Avenue, Rochester, NY 14642, USA.

Biochimica Et Biophysica Acta
|July 16, 2008
PubMed

Insights

Multidrug resistance-associated protein 1 (MRP1) enhances the release of reduced glutathione (GSH) during apoptosis. Overexpression of MRP1 protects cells from death by maintaining stable intracellular GSH levels.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Reduced glutathione (GSH) export mechanisms, crucial for cellular homeostasis and apoptosis, remain largely unidentified.
  • The multidrug resistance-associated protein (MRP/ABCC) family is implicated in GSH transport, but specific roles are unclear.

Purpose of the Study:

  • To investigate the role of MRP1 in mediating reduced glutathione (GSH) efflux under basal and apoptotic conditions.
  • To determine the impact of MRP1 overexpression on intracellular GSH levels and cellular susceptibility to apoptosis.

Main Methods:

  • Stable transfection of HEK293 cells with human MRP1 to create MRP1-overexpressing cell lines.
  • Measurement of basal and apoptotic GSH efflux using Fas antibody or staurosporine to induce apoptosis.
  • Quantification of intracellular GSH levels and assessment of cellular apoptosis rates.

Main Results:

  • MRP1-overexpressing cells exhibited significantly higher GSH release under both basal and induced apoptotic conditions.
  • Intracellular GSH levels were maintained in MRP1-overexpressing cells during apoptosis, suggesting increased GSH synthesis.
  • Cells overexpressing MRP1 showed reduced susceptibility to apoptosis, indicating a protective role of stable GSH levels.

Conclusions:

  • MRP1 plays a significant role in enhancing both basal and apoptotic reduced glutathione (GSH) release.
  • MRP1-mediated GSH efflux, coupled with increased synthesis, is essential for apoptosis progression.
  • MRP1 overexpression confers a degree of protection against apoptosis, likely through maintaining intracellular GSH homeostasis.

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