Abstract
Huntington disease (HD) is a fatal neurodegenerative disorder caused by a CAG repeat expansion in exon 1 of the huntingtin gene (HTT). One prominent target of the mutant huntingtin protein (mhtt) is the mitochondrion, affecting its morphology, distribution, and function. Thus, mitochondria have been suggested as potential therapeutic targets for the treatment of HD. Olesoxime, a cholesterol-like compound, promotes motor neuron survival and neurite outgrowth in vitro, and its effects are presumed to occur via a direct interaction with mitochondrial membranes (MMs). We examined the properties of MMs isolated from cell and animal models of HD as well as the effects of olesoxime on MM fluidity and cholesterol levels. MMs isolated from brains of aged Hdh Q111/Q111 knock-in mice showed a significant decrease in 1,6-diphenyl-hexatriene (DPH) anisotropy, which is inversely correlated with membrane fluidity. Similar increases in MM fluidity were observed in striatal STHdh Q111/Q111 cells as well as in MMs isolated from brains of BACHD transgenic rats. Treatment of STHdh cells with olesoxime decreased the fluidity of isolated MMs. Decreased membrane fluidity was also measured in olesoxime-treated MMs isolated from brains of HD knock-in mice. In both models, treatment with olesoxime restored HD-specific changes in MMs. Accordingly, olesoxime significantly counteracted the mhtt-induced increase in MM fluidity of MMs isolated from brains of BACHD rats after 12 months of treatment in vivo, possibly by enhancing MM cholesterol levels. Thus, olesoxime may represent a novel pharmacological tool to treat mitochondrial dysfunction in HD.
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Abbreviations
- AD:
-
Alzheimer disease
- α-FGF:
-
Acidic fibroblast growth factor
- CHOD-PAP:
-
Cholesteroloxidase-peroxidase-aminophenazon-phenol
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DMSO:
-
Dimethylsulfoxide
- DPH:
-
1,6-Diphenyl-hexatriene
- EDTA:
-
Ethylenediamine tetra acetic acid
- ETC.:
-
Electron transfer chain
- FCS:
-
Fetal calf serum
- HCl:
-
Hydrochloride
- HD:
-
Huntington disease
- HMG-CoA:
-
3-Hydroxy-3-methyl-glutaryl-CoA
- htt :
-
Huntingtin gene
- htt:
-
Huntingtin protein
- HTT:
-
Human huntingtin gene
- HEPES:
-
4-2-Hydroxyethyl-1-piperazineethanesulfonic acid
- IBMX:
-
3-Isobutyl-1-methylxanthine
- MβCD:
-
Methyl-β-cyclodextrine
- mhtt:
-
Mutant huntingtin protein
- mPT:
-
Mitochondrial permeability transition
- PBS:
-
Phosphate-buffered saline
- SPM:
-
Synaptosomal plasma membrane
- TPA:
-
Phorbol 12-myristate 13-acetate
- Tris:
-
Trishydroxymethylaminomethan
- TUDCA:
-
Tauroursodeoxycholic acid
- VDAC:
-
Voltage-dependent anion channel
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Acknowledgements
The data presented herein were assessed in the framework of the seventh framework program for RTD of the European Union—Project MitoTarget—(Grant Agreement HEALTH-F2-2008-223388). We are grateful to all MitoTarget members for their helpful discussions. We further thank Martina Piekorz and Therese Stanek for their excellent support in animal care.
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Janett Eckmann, Laura E. Clemens, Huu P. Nguyen, and Gunter P. Eckert contributed equally to this work.
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Eckmann, J., Clemens, L.E., Eckert, S.H. et al. Mitochondrial Membrane Fluidity is Consistently Increased in Different Models of Huntington Disease: Restorative Effects of Olesoxime. Mol Neurobiol 50, 107–118 (2014). https://doi.org/10.1007/s12035-014-8663-3
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DOI: https://doi.org/10.1007/s12035-014-8663-3