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Deletion of Arrb2 Down-regulates Autophagy in the Mouse Hippocampus via Akt-mTOR Pathway Activation

Qingyu Peng1, Yamei Liu1, Lele Yu1

  • 1School of Life Sciences, Shanghai University, Shanghai 200444, PR China.

Neuroscience
|February 16, 2023
PubMed

Insights

β-arrestin 2 (Arrb2) deficiency in mice impacts hippocampal autophagy and Akt-mTOR signaling. This study reveals Arrb2

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • The cytoplasmic adaptor protein β-arrestin 2 (Arrb2) is implicated in neurological disorders.
  • Previous studies suggest increased Arrb2 expression in autism models, but its specific role in pathogenesis remains unclear.

Purpose of the Study:

  • To investigate the physiological function of Arrb2 in the nervous system using Arrb2-deficient mice.
  • To explore the role of Arrb2 in hippocampal neuron autophagy and related signaling pathways.

Main Methods:

  • Utilized Arrb2-deficient (Arrb2-/-) mice and compared them to wild-type littermates.
  • Analyzed behavioral characteristics, autophagy markers (LC3B), Akt-mTOR signaling pathway activation, and mitochondrial function in hippocampal neurons via Western blot and other assays.

Main Results:

  • Arrb2-/- mice exhibited normal behavior but showed decreased LC3B levels in the hippocampus.
  • Deletion of Arrb2 led to hyperactivation of the Akt-mTOR signaling pathway in the hippocampus.
  • Arrb2 deficiency resulted in mitochondrial dysfunction, including reduced membrane potential, decreased ATP production, and increased reactive oxygen species.

Conclusions:

  • Arrb2 plays a role in regulating hippocampal neuron autophagy.
  • Arrb2 interacts with the Akt-mTOR signaling pathway, influencing neuronal function.
  • These findings provide insights into the molecular mechanisms underlying Arrb2's involvement in nervous system physiology.
Keywords:
Akt-mTORautophagyhippocampusβ-arrestin 2

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