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MicroRNA Dysfunction in Neurodegeneration
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MicroRNA Dysfunction in Neurodegeneration
Pathway Diagram
flowchart TD
A["MicroRNA<br/>Pathway"]
B["MicroRNAs<br/>Small Non-coding RNAs"]
C["miRNAs<br/>Mature Forms"]
D["Gene Expression<br/>Regulation"]
E["ALS<br/>Motor Neuron Disease"]
F["Cancer<br/>Malignancy"]
G["Apoptosis<br/>Programmed Cell Death"]
H["PI3K/AKT<br/>Survival Pathway"]
I["Inflammation<br/>Immune Response"]
J["Therapeutic<br/>Target"]
K["Neurodegeneration<br/>Disease Outcome"]
L["Tumor<br/>Formation"]
M["Cell Death<br/>Pathways"]
B -->|"regulates"| A
C -->|"regulates"| A
B -->|"activates"| A
C -->|"expressed_in"| A
A -->|"controls"| D
D -->|"modulates"| G
D -->|"regulates"| H
H -->|"inhibits"| G
G -->|"leads_to"| M
A -->|"therapeutic_target"| E
A -->|"therapeutic_target"| F
A -->|"therapeutic_target"| I
E -->|"associated_with"| K
F -->|"leads_to"| L
I -->|"contributes_to"| K
A -->|"potential_therapy"| J
G -->|"therapeutic_target"| J
I -->|"therapeutic_target"| J
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Overview
...
MicroRNA Dysfunction in Neurodegeneration
Pathway Diagram
Mermaid diagram (expand to render)
Overview
MicroRNA (miRNA) dysfunction plays a critical role in neurodegenerative diseases by disrupting gene expression patterns essential for neuronal survival, synaptic function, and protein homeostasis. miRNAs are small non-coding RNAs that regulate gene expression post-transcriptionally by binding to target mRNAs and inhibiting their translation or promoting degradation. Dysregulated miRNA expression is implicated in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), [amyotrophic lateral sclerosis](/diseases/als), and [Huntington's disease](/diseases/huntingtons) [@junn2013].
Biogenesis of miRNAs
Nuclear Processing
- Primary miRNA (pri-miRNA): Transcribed by RNA polymerase II as long transcripts [@lee2002]
- Drosha: Nuclear RNase III enzyme cleaves pri-miRNA to pre-miRNA [@kim2004]
- DGCR8: Essential co-factor for Drosha processing [@han2006]
Cytoplasmic Processing
- Exportin-5: Transports pre-miRNA to cytoplasm [@exportin2003]
- Dicer: Cytoplasmic RNase III cleaves pre-miRNA to mature miRNA duplex [@bernstein2001]
- TRBP: Dicer co-factor for processing [@chendrimada2005]
Loading into RISC
- Argonaute (AGO) proteins: Core component of RNA-induced silencing complex (RISC) [@meister2004]
- GW182: Mediates translational repression and deadenylation [@eulalio2009]
- Target mRNA recognition: 6-8 nucleotide seed region determines specificity [@bartel2009]
Key miRNAs in Neurodegeneration
miR-9
miR-9 is crucial for neuronal development and function:
- Target genes: REST, FOXG1, and Notch signaling components [@coolen2013]
- Alzheimer's disease: Reduced in AD [hippocampus](/brain-regions/hippocampus) and cortical regions [@lukiw2008]
- Parkinson's disease: Dysregulated in substantia nigra [@sanchezreyes2014]
- Function: Maintains neuronal identity, regulates synaptic plasticity [@shibata2011]
miR-124
miR-124 is the most abundant neuron-specific miRNA:
- Target genes: PTBP1, REST, and synaptic proteins [@makeyev2007]
- Alzheimer's disease: Promotes [BACE1](/entities/bace1) expression, affects [APP](/entities/app-protein) processing [@fang2012]
- Parkinson's disease: Modulates [α-synuclein](/proteins/alpha-synuclein) expression [@doxakis2010]
- Function: Neuronal differentiation, synaptic formation [@mir2008]
miR-29 family
miR-29 family (miR-29a, b, c) is important for neuronal health:
- Target genes: BACE1, DNMT3A, and anti-apoptotic proteins [@hbert2009]
- Alzheimer's disease: Decreased in AD brains, leads to increased BACE1 [@hbert2008]
- ALS: Reduced in motor [neurons](/entities/neurons), affects [TDP-43](/mechanisms/tdp-43-proteinopathy) pathology [@kaucsar2010]
- Function: Regulates [apoptosis](/entities/apoptosis), [DNA methylation](/entities/dna-methylation) [@pavlaki2018]
miR-153
miR-153 targets α-synuclein and BACE1:
- Target genes: SNCA, BACE1 [@doxakis2014]
- Alzheimer's disease: Decreased, contributing to BACE1 upregulation [@liang2012]
- Parkinson's disease: Reduced, leading to α-synuclein accumulation [@tomaselli2015]
- Function: Direct regulation of neurodegeneration genes [@barbini2023]
miRNA Dysregulation Mechanisms
Transcriptional Dysregulation
- Transcription factor alterations: REST dysfunction in AD affects neuronal miRNA expression [@rest2014]
- Epigenetic modifications: DNA methylation of miRNA promoters [@hwang2013]
- Aging: Global miRNA expression changes with age [^29]
Processing Defects
- Dicer dysfunction: Reduced Dicer in AD and PD brains [@saba2008]
- Exportin-5 impairment: Affects pre-miRNA nuclear export [@bhan2019]
- AGO2 modifications: Oxidative stress affects RISC function [@kurosaki2019]
Target Accessibility
- Single nucleotide polymorphisms (SNPs): In miRNA binding sites alter targeting [@mupper2012]
- RNA-binding proteins: Compete for mRNA binding [@kedde2007]
- Circular RNAs (circRNAs): Act as miRNA sponges [@hansen2013]
Disease-Specific miRNA Changes
Alzheimer's Disease
| miRNA | Change | Target | Function |
|-------|--------|--------|----------|
| miR-9 | ↓ | BACE1 | Amyloid processing [@hbert2008] |
| miR-29 | ↓ | BACE1 | Amyloid processing [@hbert2008] |
| miR-124 | ↑ | BACE1 | Amyloid processing [@fang2012] |
| miR-146a | ↑ | TRAF6 | Neuroinflammation [@cui2010] |
| miR-155 | ↑ | SOCS1 | Neuroinflammation [@gomes2013] |
Parkinson's Disease
| miRNA | Change | Target | Function |
|-------|--------|--------|----------|
| miR-7 | ↓ | α-synuclein | Protein aggregation [@junn2009] |
| miR-124 | ↓ | DJ-1, BAX | Neuroprotection [@kanagaraj2014] |
| miR-153 | ↓ | α-synuclein | Protein aggregation [@tomaselli2015] |
| miR-29 | ↓ | SNCA | Protein aggregation [@choi2014] |
| miR-184 | ↓ | GLUT4 | Energy metabolism [@miller2013] |
Amyotrophic Lateral Sclerosis
| miRNA | Change | Target | Function |
|-------|--------|--------|----------|
| miR-155 | ↑ | [C9orf72](/entities/c9orf72) | RNA toxicity [@koval2013] |
| miR-29 | ↓ | SOD1 | Motor neuron survival [@kaucsar2010] |
| miR-23a | ↓ | PGC-1α | Mitochondrial function [@williams2009] |
| miR-218 | ↓ | SOD1, VGF | Motor neuron function [@rickert2016] |
Therapeutic Strategies
miRNA Mimics
- miR-9 mimics: Under development for AD treatment [@jadhav2022]
- miR-29 mimics: Potential for BACE1 reduction [@absalon2013]
- miR-7 mimics: Protect against α-synuclein toxicity [@kabaria2015]
miRNA Inhibitors (Antagomirs)
- Anti-miR-155: In clinical trials for ALS and neuroinflammation [@koval2013a]
- Anti-miR-146a: Reduces neuroinflammation in AD models [@rom2019]
- Anti-miR-124: Under investigation for PD [@zhang2020]
Small Molecule Modulators
- Valproic acid: Increases miR-9 expression [@jadhav2014]
- [HDAC](/entities/hdac-enzymes) inhibitors: Modulate miRNA transcription [@portoso2017]
- Natural compounds: Curcumin, resveratrol affect miRNA expression [@mudduluru2015]
Gene Therapy
- AAV-miRNA: Targeted delivery of miRNA mimics/inhibitors [@berger2017]
- Lenti-miRNA: Transient modulation of miRNA levels [@huang2012]
- Exosome delivery: Natural miRNA delivery vehicles [@alvarezerviti2011]
Diagnostic and Biomarker Potential
CSF miRNAs
- miR-27a, miR-29c: Elevated in AD CSF [@cogswell2008]
- miR-153, miR-409-3p: Reduced in PD CSF [@soreq2013]
- miR-219: ALS-specific changes [@benigni2016]
Blood miRNAs
- miR-132: AD blood biomarker [@wong2013]
- miR-153, miR-223: PD blood markers [@maringer2018]
- miR-206: ALS progression marker [@tosolini2013]
Research Directions (2024-2026)
- Single-cell miRNA sequencing to understand cell-type specific changes [@michlewski2024]
- miRNA delivery systems using lipid nanoparticles and [exosomes](/entities/exosomes) [@zhang2023]
- CRISPR-Cas13 based miRNA editing [@katrekar2019]
- Personalized miRNA signatures for neurodegenerative diseases [@mendell2023]
- Multi-omi approaches integrating miRNA with proteomics and metabolomics [@nuneziglesias2024]
Cross-Linked Pathways
- [Epigenetic mechanisms](/mechanisms/epigenetic-regulation)
- [Gene expression regulation](/mechanisms/gene-expression)
- [Synaptic plasticity](/mechanisms/synaptic-plasticity)
- [Neuroinflammation](/mechanisms/neuroinflammation)
See Also
- [Alzheimer's disease](/diseases/alzheimers-disease)
- [Parkinson's disease](/diseases/parkinsons-disease)
- [amyotrophic lateral sclerosis](/diseases/als)
- [Huntington's disease](/diseases/huntingtons)
- [Epigenetic mechanisms](/mechanisms/epigenetic-regulation)
- [Gene expression regulation](/mechanisms/gene-expression)
- [Synaptic plasticity](/mechanisms/synaptic-plasticity)
- [Neuroinflammation](/mechanisms/neuroinflammation)
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/)
- [KEGG Pathways](https://www.genome.jp/kegg/pathway.html)
Recent Research Updates (2024-2026)
This section highlights recent publications relevant to this mechanism.
- [Exploring Sex-Based Mechanisms of Inflammation and Neurodegeneration in Multiple Sclerosis.](https://pubmed.ncbi.nlm.nih.gov/41744049/) (2026 Apr) - Biological research for nursing
- [Brain-derived extracellular vesicles: A promising avenue for Parkinson's disease pathogenesis, diagnosis, and treatment.](https://pubmed.ncbi.nlm.nih.gov/40313118/) (2026 Apr 1) - Neural regeneration research
- [In vitro investigation of miR-206-3p-loaded extracellular vesicles as modulators of Aβ-induced neurodegeneration.](https://pubmed.ncbi.nlm.nih.gov/41592400/) (2026 Feb 26) - Biochemical and biophysical research communications
- [miR-137-5p-Loaded Milk-Derived Small Extracellular Vesicles Modulate Oxidative Stress, Mitochondrial Dysfunction, and Neuroinflammatory Responses in an In Vitro Alzheimer's Disease Model.](https://pubmed.ncbi.nlm.nih.gov/41754992/) (2026 Feb 18) - Pharmaceutics
- [Nutrigenomic influence of a curcumin-supplemented high glycemic diet on hippocampal microvasculature in male C57BL/6J mice.](https://pubmed.ncbi.nlm.nih.gov/41710590/) (2025) - Frontiers in nutrition
References
Related Entities
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| wiki_page_id | wp-3184bb5dc5e0 |
| __merged_from | {'merged_at': '2026-05-13', 'unprefixed_id': 'mechanisms-microrna-dysfunction'} |
| _schema_version | 1 |
📊 Evidence Profile
Foundational
Evidence Balance
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Certainty
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Debates
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Incoming
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Outgoing
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0 supporting
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