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Targeting antioxidants to mitochondria by conjugation to lipophilic cations

Michael P Murphy1, Robin A J Smith

  • 1MRC Dunn Human Nutrition Unit, Wellcome Trust/MRC Building, Cambridge CB2 2XY, United Kingdom. mpm@mrc-dunn.cam.ac.uk

Annual Review of Pharmacology and Toxicology
|October 4, 2006
PubMed

Insights

Mitochondria-targeted antioxidants, developed by linking a positive charge to antioxidants, accumulate within mitochondria. These compounds show promise for treating degenerative diseases by protecting mitochondria from oxidative damage after oral delivery.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Cell Biology

Background:

  • Mitochondrial oxidative damage is implicated in various degenerative diseases.
  • Targeting antioxidants to mitochondria is a potential therapeutic approach.
  • Mitochondria-targeted antioxidants can be developed using lipophilic cations.

Purpose of the Study:

  • To review the development and efficacy of mitochondria-targeted antioxidants.
  • To explore their potential in treating diseases associated with mitochondrial oxidative damage.

Main Methods:

  • Conjugation of lipophilic triphenylphosphonium cation to antioxidant moieties (ubiquinol, alpha-tocopherol).
  • Assessment of compound ability to cross biological membranes, including the blood-brain barrier.
  • Evaluation of mitochondrial accumulation driven by membrane potential.
  • Testing efficacy following oral delivery in protecting mitochondria from oxidative damage.

Main Results:

  • Mitochondria-targeted antioxidants readily cross biological membranes and accumulate within mitochondria.
  • These compounds demonstrate protective effects against mitochondrial oxidative damage.
  • Oral administration leads to effective mitochondria protection.

Conclusions:

  • Mitochondria-targeted antioxidants represent a promising therapeutic strategy for degenerative diseases.
  • Their selective accumulation and protective effects offer a novel approach to mitochondria-based therapies.

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