MFN2 agonists reverse mitochondrial defects in preclinical models of Charcot-Marie-Tooth disease type 2A

  • Science. 2018 Apr 20;360(6386):336-341. doi: 10.1126/science.aao1785.
Agostinho G Rocha  1 ,  Antonietta Franco  1 ,  Andrzej M Krezel  2 ,  Jeanne M Rumsey  1 ,  Justin M Alberti  1 ,  William C Knight  1 ,  Nikolaos Biris  3 ,  Emmanouil Zacharioudakis  3 ,  James W Janetka  2 ,  Robert H Baloh  4 ,  Richard N Kitsis  5 ,  Daria Mochly-Rosen  6 ,  R Reid Townsend  1 ,  Evripidis Gavathiotis  3 ,  Gerald W Dorn 2nd  7
Affiliations
  • 1. Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA.
  • 2. Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO, USA.
  • 3. Departments of Biochemistry and Medicine, Wilf Family Cardiovascular Research Institute, Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY, USA.
  • 4. Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
  • 5. Departments of Medicine and Cell Biology, Wilf Family Cardiovascular Research Institute, Albert Einstein Cancer Center, and Einstein-Mount Sinai Diabetes Research Center, Albert Einstein College of Medicine, Bronx, NY, USA.
  • 6. Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, CA, USA.
  • 7. Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA. [email protected].
PMID: 29674596 DOI: 10.1126/science.aao1785
Abstract

Mitofusins (MFNs) promote fusion-mediated mitochondrial content exchange and subcellular trafficking. Mutations in Mfn2 cause neurodegenerative Charcot-Marie-Tooth disease type 2A (CMT2A). We showed that MFN2 activity can be determined by Met376 and His380 interactions with Asp725 and Leu727 and controlled by PINK1 kinase-mediated phosphorylation of adjacent MFN2 Ser378 Small-molecule mimics of the peptide-peptide interface of MFN2 disrupted this interaction, allosterically activating MFN2 and promoting mitochondrial fusion. These first-in-class mitofusin agonists overcame dominant mitochondrial defects provoked in cultured neurons by CMT2A mutants MFN2 Arg94→Gln94 and MFN2 Thr105→Met105, as demonstrated by amelioration of mitochondrial dysmotility, fragmentation, depolarization, and clumping. A mitofusin agonist normalized axonal mitochondrial trafficking within sciatic nerves of MFN2 Thr105→Met105 mice, promising a therapeutic approach for CMT2A and Other untreatable diseases of impaired neuronal mitochondrial dynamism and/or trafficking.

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