Abstract
Huntington’s disease (HD) is a fatal and pure genetic disease with a progressive loss of medium spiny neurons (MSN). HD is caused by expanded polyglutamine repeats in the exon 1 of HD gene. Clinically, HD is characterized by chorea, seizures, involuntary movements, dystonia, cognitive decline, intellectual impairment, and emotional disturbances. Several years of intense research revealed that multiple cellular changes, including defective axonal transport, protein-protein interactions, defective bioenergetics, calcium dyshomeostasis, NMDAR activation, synaptic damage, mitochondrial abnormalities, and selective loss of medium spiny neurons are implicated in HD. Recent research on mutant huntingtin (mHtt) and mitochondria has found that mHtt interacts with the mitochondrial division protein, dynamin-related protein 1 (DRP1), enhances GTPase DRP1 enzymatic activity, and causes excessive mitochondrial fragmentation and abnormal distribution, leading to defective axonal transport of mitochondria and selective synaptic degeneration. Recent research also revealed that failure to remove dead and/or dying mitochondria is an early event in the disease progression. Currently, efforts are being made to reduce abnormal protein interactions and enhance synaptic mitophagy as therapeutic strategies for HD. The purpose of this article is to discuss recent research in HD progression. This article also discusses recent developments of cell and mouse models, cellular changes, mitochondrial abnormalities, DNA damage, bioenergetics, oxidative stress, mitophagy, and therapeutics strategies in HD.
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Abbreviations
- ADRM1:
-
Adhesion regulating molecule 1
- ATM:
-
Ataxia-telangiectasia mutated
- BACHD:
-
Bacterial artificial chromosome Huntington’s disease
- BDNF:
-
Brain-derived neurotrophic factor
- BER:
-
Base excision repair
- CBP:
-
CREB-binding protein
- COX1:
-
Cytochrome oxidase complex 1
- CtBP:
-
Transcriptional corepressor C-terminal-binding protein
- CypD:
-
Cyclophilin D
- DARPP-32:
-
Dopamine-regulated neuronal phosphoprotein
- DRP1:
-
Dynamin-related protein 1
- ER:
-
Endoplasmic reticulum
- ESCs:
-
Embryonic stem cells,
- ETC:
-
Electron transport chain
- FEN1:
-
Flap endonuclease 1
- Fis1:
-
Mitochondrial fission 1 protein
- GABA:
-
gamma-aminobutyric acid
- GluN1:
-
N-methyl D-aspartate receptor subtype 1
- GRP75:
-
Glucose-related protein 75
- H2O2 :
-
Hydrogen peroxide
- HAP1:
-
Huntington’s associated protein 1
- HD:
-
Huntington’s disease
- Htt:
-
Huntingtin protein
- IP3R3:
-
Inositol 1,4,5-trisphosphate receptor, type 3
- iPSCs:
-
Induced pluripotent stem cells
- MAP2:
-
Microtubule-associated protein 2
- Mfn1:
-
Mitofusin 1
- Mfn2:
-
Mitofusin 2
- mHtt:
-
Mutant huntingtin
- MPT:
-
Mitochondrial permeability transition pore
- MSNs:
-
Medium spiny neurons
- MtDNA:
-
Mitochondrial DNA
- NAKAP:
-
Nuclear scaffold protein
- NCOR:
-
Nuclear corepressor
- NII:
-
Neuronal intranuclear inclusions
- NMDAR:
-
N-methyl-D-aspartate receptor
- NOX:
-
Nicotinamide adenine dinucleotide phosphate oxidase
- NRF1:
-
Nuclear respiratory factor 1,
- NRF2:
-
Nuclear respiratory factor 2
- NRSF:
-
Neuron-restrictive silencer factor
- NRSF:
-
Neuron-restrictive silencer factor
- NSCs:
-
Neural stem cells
- OH-:
-
Hydroxyl radical
- OH8dG:
-
8‐hydroxy‐2‐deoxyguanosine
- OPA1:
-
Optic atrophy protein 1
- PGC-1a:
-
Peroxisome proliferator-activated receptor gamma coactivator 1-alpha
- PINK1:
-
PTEN-induced kinase 1
- PolyQ:
-
Polyglutamine expansion
- PRC2:
-
Polycomb repressive complex 2
- PSD95:
-
Postsynaptic density protein
- RNA:
-
Reactive nitrogen species
- ROS:
-
Reactive oxygen species
- Tcerg1/CA150:
-
The transcription elongation regulator 1
- TFAM:
-
Mitochondrial transcription factor A
- Tomm 40:
-
Translocase of outer mitochondrial membrane 40 homolog
- YAC:
-
Yeast artificial chromosome
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Funding
The research presented in this article was supported by NIH grants AG042178, AG047812, NS105473, AG060767, AG069333, and AG066347 (to PHR) and Alzheimer’s Association through a SAGA grant, Garrison Family Foundation Grant, and NIH grant AG063162 (to APR).
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N.S., A.P.R and P.H.R contributed to the conceptualization and formatting of the article. N.S., H.M., S. S., A.P.R. and P.H.R. are responsible for writing, original draft preparation, and finalization of the manuscript. A.P.R and P.H.R. are responsible for funding acquisition.
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Sawant, N., Morton, H., Kshirsagar, S. et al. Mitochondrial Abnormalities and Synaptic Damage in Huntington’s Disease: a Focus on Defective Mitophagy and Mitochondria-Targeted Therapeutics. Mol Neurobiol 58, 6350–6377 (2021). https://doi.org/10.1007/s12035-021-02556-x
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DOI: https://doi.org/10.1007/s12035-021-02556-x