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Alzheimer's Imaging Consortium.

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Summary
This summary is machine-generated.

MicroRNA miR-153-3p may be a master regulator for Alzheimer's disease (AD) and other neurodegenerative diseases. This microRNA (miRNA) reduces key proteins like amyloid precursor protein (APP) and alpha-synuclein (SNCA), suggesting therapeutic potential.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Neurodegenerative diseases, including Alzheimer's disease (AD) and Lewy body dementias (ADRDs), share complex pathological pathways.
  • MicroRNAs (miRNAs) are critical regulators of biological processes implicated in neurodegeneration.
  • Key pathological hallmarks include amyloid plaques (Aβ), neurofibrillary tangles (tau), and alpha-synuclein (SNCA) aggregation, with altered Repressor Element 1-Silencing Transcription (REST) factor levels.

Purpose of the Study:

  • To investigate the role of miR-153-3p in Alzheimer's disease (AD) risk.
  • To determine if miR-153-3p regulates key neurodegenerative proteins, including amyloid precursor protein (APP), alpha-synuclein (SNCA), and REST.
  • To explore the association of miR-153-3p and its genetic variants with AD risk and endophenotypes.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) was used to measure miR-153 levels in post-mortem brain tissues from non-cognitively impaired (NCI) and AD subjects.
  • Association studies were performed using autopsy brain tissues and ADNI participant genotyping to link miR-153-3p single nucleotide polymorphisms (SNPs) with AD risk and endophenotypes.
  • In vitro studies utilized induced pluripotent stem cell (iPSC)-derived neuronal cells and human cell lines for miRNA transfections to elucidate miR-153-3p's mechanism of action.

Main Results:

  • Elevated miR-153-3p levels were associated with a decreased probability of AD, whereas elevated REST levels correlated with an increased likelihood of AD.
  • Genetic variations (SNPs) in the miR-153 gene were significantly associated with nine AD-related endophenotypes.
  • miR-153-3p demonstrated the ability to reduce the activity and protein levels of REST, APP, and SNCA, and influenced REST expression and neuronal differentiation in iPSC-derived neuronal stem cells.
  • RNA sequencing, proteomics, and interactome analysis identified miR-153-3p's involvement in axonal guidance pathways.

Conclusions:

  • miR-153-3p acts as a significant regulator, decreasing the expression of critical neurodegeneration-associated proteins such as APP, SNCA, and REST.
  • These findings highlight the potential of miR-153-3p as both a therapeutic target and a biomarker for Alzheimer's disease (AD) and related dementias (ADRDs).
  • Future research will include profiling miR-153 in early-onset AD cases to further understand its role across different AD subtypes.