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MicroRNA-107 prevents amyloid-β-induced neurotoxicity and memory impairment in mice

Bohui Shu1, Xiaoyan Zhang1, Ganqin Du1

  • 1The First Affiliated Hospital and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, Henan 471003, P.R. China.

International Journal of Molecular Medicine
|December 30, 2017
PubMed

Insights

Alzheimer's disease (AD) involves amyloid plaque buildup. Restoring miR-107 levels in mice reversed memory loss and neuronal damage caused by amyloid-beta, suggesting miR-107 as a potential AD treatment.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Alzheimer's disease (AD) pathogenesis is complex, with amyloid plaque accumulation implicated in its symptoms.
  • MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression and protein degradation.
  • Amyloid-beta (Aβ) is a key component of amyloid plaques in AD.

Purpose of the Study:

  • To investigate the role of miR-107 in Alzheimer's disease pathogenesis.
  • To determine if miR-107 can counteract the neurotoxic effects of amyloid-beta.

Main Methods:

  • Alzheimer's disease symptoms were induced in mice via intraventricular injection of amyloid-beta 1-42 (Aβ1-42).
  • miR-107 mimic was administered to assess its therapeutic potential.
  • Spatial memory, hippocampal long-term potentiation (LTP), and neuronal loss were evaluated.
  • Levels of Aβ1-42, phosphorylated Tau, brain-derived neurotrophic factor (BDNF), and related signaling pathways were measured.

Main Results:

  • Aβ1-42 injection decreased miR-107 levels and caused spatial memory impairment, reduced LTP, and CA1 pyramidal neuron loss.
  • Administration of miR-107 mimic reversed these Aβ-induced deficits.
  • miR-107 mimic also reduced Aβ1-42 and phosphorylated Tau levels.
  • The miR-107 mimic restored BDNF levels and downstream signaling (TrkB, Akt phosphorylation).

Conclusions:

  • miR-107 plays a protective role against Aβ-induced neurotoxicity.
  • Restoring miR-107 levels can ameliorate cognitive deficits and neuropathological changes in an AD mouse model.
  • miR-107 represents a promising therapeutic target for Alzheimer's disease treatment.

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