Cited by 55Parkinson's Disease Mechanisms and TreatmentsNeuroinflammation and Neurodegeneration MechanismsAutophagy in Disease and Therapy

MicroRNA-101 Modulates Autophagy and Oligodendroglial Alpha-Synuclein Accumulation in Multiple System Atrophy

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Valera, Elvira, Spencer, Brian, Mott, Jennifer, Trejo, Margarita, Adame, Anthony, Mante, Michael, Rockenstein, Edward, Troncoso, Juan C. +3 more·2017·Frontiers in Molecular Neuroscience

Abstract

Synucleinopathies, neurodegenerative disorders with alpha-synuclein (α-syn) accumulation, are the second leading cause of neurodegeneration in the elderly, however no effective disease-modifying alternatives exist for these diseases. Multiple system atrophy (MSA) is a fatal synucleinopathy characterized by the accumulation of toxic aggregates of α-syn within oligodendroglial cells, leading to demyelination and neurodegeneration, and the reduction of this accumulation might halt the fast progression of MSA. In this sense, the involvement of microRNAs (miRNAs) in synucleinopathies is yet poorly understood, and the potential of manipulating miRNA levels as a therapeutic tool is underexplored. In this study, we analyzed the levels of miRNAs that regulate the expression of autophagy genes in MSA cases, and investigated the mechanistic correlates of miRNA dysregulation in in vitro models of synucleinopathy. We found that microRNA-101 (miR-101) was significantly increased in the striatum of MSA patients, together with a reduction in the expression of its predicted target gene RAB5A. Overexpression of miR-101 in oligodendroglial cell cultures resulted in a significant increase in α-syn accumulation, along with autophagy deficits. Opposite results were observed upon expression of an antisense construct targeting miR-101. Stereotaxic delivery of a lentiviral construct expressing anti-miR-101 into the striatum of the MBP-α-syn transgenic mouse model of MSA resulted in reduced oligodendroglial α-syn accumulation and improved autophagy. These results suggest that miRNA dysregulation contributes to MSA pathology, with miR-101 alterations potentially mediating autophagy impairments. Therefore, therapies targeting miR-101 may represent promising approaches for MSA and related neuropathologies with autophagy dysfunction.

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Crossref · 10.3389/fnmol.2017.00329

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  • Autophagy is regulated by distinct mechanisms in different cell types, and these cell type-specific mechanisms underlie the differential vulnerability of separate tissues to autophagy mutations, resulting in heterogeneous manifestations of disease.

    “Furthermore, mounting evidence shows that autophagy is regulated by distinct mechanisms in different cell types [11–26], and these cell type-specific mechanisms underlie the differential vulnerability of separate tissues to autophagy mutations, resulting in heterogenous manifestations of disease.”
  • In multiple system atrophy, the pathologic hallmark consists of cytoplasmic SNCA inclusions in oligodendrocytes.

    “In multiple system atrophy (MSA), the pathologic hallmark consists of cytoplasmic SNCA inclusions in oligodendrocytes [12],”
  • Accumulation of SNCA inclusions in oligodendrocytes is exacerbated by autophagy inhibition, either pharmacologically with chloroquine or genetically by MIR101 overexpression.

    “and the accumulation of these inclusions is exacerbated by autophagy inhibition, either pharmacologically with chloroquine or genetically by MIR101 overexpression [12,450,454].”

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Authors
Valera, E., Spencer, B., Mott, J., Trejo, M., Adame, A., Mante, M., Rockenstein, E., Troncoso, J. C., Beach, T. G., Masliah, E., & Desplats, P.
Affiliations
  • University of California San Diego (US)
  • Johns Hopkins University (US)
  • Banner Sun Health Research Institute (US)
Corresponding author
Desplats, Paula
Venue
Frontiers in Molecular Neuroscience
Published
2017-10-17
Volume
10
Pages
329-329
ISSN
1662-5099 (ISSN-L)
OpenAlex
W2766187488
Cited by
55
References
91
Citations by year
2025: 6 · 2024: 4 · 2023: 7 · 2022: 6 · 2021: 7 · 2020: 9 · 2019: 10 · 2018: 6
FWCI
4.76
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Molecular Neuroscience (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institutes of Health (AG18440, AG022074, NS044233, NS092803)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
microRNA-101, multiple system atrophy, alpha-synuclein accumulation, autophagy, oligodendroglial cells, synucleinopathies, Rab5a, microRNA dysregulation, lentiviral gene delivery, striatum, demyelination, neurodegeneration, therapeutic target

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