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cAMP-induced decrease in cell-surface laminin receptor and cellular prion protein attenuates amyloid-β uptake and

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Cyclic AMP (cAMP) protects neuronal cells from amyloid-β oligomer (AβO) toxicity by reducing cell-surface prion protein (PrPC) and laminin receptor (67LR) levels. This mechanism inhibits AβO uptake and subsequent cell death.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Amyloid-β oligomers (AβO) are implicated in neuronal dysfunction.
  • AβO bind to cellular prion protein (PrPC), forming complexes with co-receptors like the laminin receptor (67LR).

Purpose of the Study:

  • To investigate the role of 67LR as a co-receptor in AβO uptake and toxicity.
  • To explore the neuroprotective effects of cAMP-elevating agents against AβO-induced neuronal cell death.

Main Methods:

  • Utilized Neuroscreen-1 cells to study AβO-PrPC interactions.
  • Administered pharmacological and physiological cAMP-elevating agents.
  • Assessed cell-surface PrPC and 67LR levels, AβO uptake, and neuronal cell death.
  • Investigated the involvement of protein kinase A (PKA) and exchange protein directly activated by cAMP (Epac).

Main Results:

  • 67LR was identified as the primary co-receptor for AβO uptake and AβO-induced cell death in Neuroscreen-1 cells.
  • cAMP-elevating agents significantly reduced cell-surface PrPC and 67LR expression.
  • Reduced co-receptor levels attenuated AβO uptake and subsequent neuronal cell death.
  • The protective effects of cAMP were dependent on PKA activation but independent of Epac.

Conclusions:

  • cAMP-elevating agents confer neuroprotection against AβO toxicity.
  • This protection is mediated by the downregulation of cell-surface PrPC and 67LR, thereby inhibiting AβO binding and cellular entry.
  • Targeting cAMP signaling pathways may represent a therapeutic strategy for AβO-related neurodegenerative diseases.