Abstract
Mitochondrial diseases (MD), such as Leigh syndrome (LS), present with severe neurological and muscular phenotypes in patients, but have no known cure and limited treatment options. Based on their neuroprotective effects against other neurodegenerative diseases in vivo and their positive impact as an antioxidant against complex I deficiency in vitro, we investigated the potential protective effect of metallothioneins (MTs) in an Ndufs4 knockout mouse model (with a very similar phenotype to LS) crossed with an Mt1 overexpressing mouse model (TgMt1). Despite subtle reductions in the expression of neuroinflammatory markers GFAP and IBA1 in the vestibular nucleus and hippocampus, we found no improvement in survival, growth, locomotor activity, balance, or motor coordination in the Mt1 overexpressing Ndufs4−/− mice. Furthermore, at a cellular level, no differences were detected in the metabolomics profile or gene expression of selected one-carbon metabolism and oxidative stress genes, performed in the brain and quadriceps, nor in the ROS levels of macrophages derived from these mice. Considering these outcomes, we conclude that MT1, in general, does not protect against the impaired motor activity or improve survival in these complex I–deficient mice. The unexpected absence of increased oxidative stress and metabolic redox imbalance in this MD model may explain these observations. However, tissue-specific observations such as the mildly reduced inflammation in the hippocampus and vestibular nucleus, as well as differential MT1 expression in these tissues, may yet reveal a tissue- or cell-specific role for MTs in these mice.
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Data Availability
The data that support the findings of this study are available from the corresponding author, FHvdW, upon reasonable request.
Abbreviations
- 1C:
-
One-carbon
- ADP:
-
Adenosine diphosphate
- BMDM:
-
Bone marrow–derived macrophage
- BH-FDR:
-
Benjamini–Hochberg adjustment to control the rate of false discovery
- CI:
-
Complex I
- CII:
-
Complex II
- CIII:
-
Complex III
- CIV:
-
Complex IV
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- DNA:
-
Deoxyribonucleic acid
- dNTP:
-
Deoxynucleotide triphosphate
- GC-TOF-MS:
-
Gas chromatography time-of-flight mass spectrometry
- GFAP:
-
Glial fibrillary acidic protein
- GSH:
-
Reduced glutathione
- GSSG:
-
Oxidised glutathione
- H2DCF-DA:
-
2′,7′-Dichlorodihydrofluorescein diacetate
- H2O2 :
-
Hydrogen peroxide
- IBA1:
-
Ionised calcium binding adapter molecule 1
- IL6:
-
Interleukin 6
- IL12:
-
Interleukin 12
- KO:
-
Ndufs4 knockout
- KO OVER:
-
Ndufs4 knockout Mt1 overexpressing
- LC-MS/MS:
-
Liquid chromatography-tandem mass spectrometry
- LS:
-
Leigh syndrome
- MCP1:
-
Monocyte chemoattractant protein 1
- MCSF:
-
Macrophage colony-stimulating factor
- mRNA:
-
Messenger RNA
- MD:
-
Mitochondrial disease
- MT:
-
Metallothionein
- NAD+ :
-
Oxidised nicotinamide adenine dinucleotide
- NADH:
-
Reduced nicotinamide adenine dinucleotide
- NDUFS4:
-
NADH:ubiquinone oxidoreductase subunit S4
- NMR:
-
Nuclear magnetic resonance spectroscopy
- NWU:
-
North-West University
- OVER:
-
Mt1 overexpressing
- P:
-
Postnatal day
- PARP:
-
Poly[adenine diphosphate (ADP)-ribose] polymerase
- PBS:
-
Physiological buffered saline
- PCR:
-
Polymerase chain reaction
- RC:
-
Respiratory chain
- RNA:
-
Ribonucleic acid
- ROS:
-
Reactive oxygen species
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- SI:
-
Supporting information
- TNF:
-
Tumour necrosis factor
- UCS:
-
Unit citrate synthase
- WT:
-
Wild type
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Acknowledgements
We thank Kobus Venter and Antoinette Fick from the Pre-Clinical Drug Development Platform (PCDDP, NWU, RSA) for their assistance regarding animal handling. We also thank Dr. De Wet Wolmarans from the Department of Pharmacology (NWU, Potchefstroom, South Africa) for the use of his open field testing equipment and the Instrument Making Department of the NWU for the construction of all other phenotyping equipment. We lastly thank Prof. Juan Hidalgo at the Institut de Neurosciencies at the Autonomous University of Barcelona for the generous provision of the MT antibodies used in the immunohistochemistry analyses.
Funding
This work was supported by the National Research Foundation of South Africa (NRF; Grant Number 92736). AQ is a Ramón y Cajal fellow (RyC-2012-11873) and received funds from the European Research Council (starting grant NEUROMITO, ERC-2014-StG-638106), MINECO Proyectos I+D de Excelencia (SAF2014-57981P), MINECO Proyectos I+D “Retos Investigación” (SAF2017–88108-R), and AGAUR (2017SGR-323).
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All authors reviewed, edited, and approved the final manuscript version for submission, and all authors were involved with the design of the methodology. Hayley Christy Miller: conceptualisation, formal analysis, investigation, writing—original draft, visualisation. Roan Louw: conceptualisation, writing—original draft. Michelle Mereis: investigation, visualisation. Gerda Venter: conceptualisation. John-Drew Boshoff: formal analysis, investigation, visualisation. Liesel Mienie: formal analysis, investigation, visualisation. Mari van Reenen: conceptualisation, formal analysis. Marianne Venter: formal analysis. Jeremie Zander Lindeque: formal analysis. Adán Domínguez-Martínez: formal analysis, visualisation. Albert Quintana: conceptualisation, investigation, resources, visualisation, Supervision. Francois Hendrikus van der Westhuizen: conceptualisation, writing—original draft, supervision, project administration, funding acquisition.
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The AnimCare animal research ethics committee of the NWU approved (approval numbers NWU-00364-16-A5 and NWU-00001-15-A5) the animal protocols used in this study. All animals were maintained, and all procedures performed, in accordance with the code of ethics in research, training, and testing of drugs in South Africa and complied with national legislation.
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Miller, H.C., Louw, R., Mereis, M. et al. Metallothionein 1 Overexpression Does Not Protect Against Mitochondrial Disease Pathology in Ndufs4 Knockout Mice. Mol Neurobiol 58, 243–262 (2021). https://doi.org/10.1007/s12035-020-02121-y
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DOI: https://doi.org/10.1007/s12035-020-02121-y