PTEN recruitment controls synaptic and cognitive function in Alzheimer's models.

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Amyloid-β peptide (Aβ) dyshomeostasis is implicated in Alzheimer's disease (AD) pathogenesis, causing synaptic dysfunction and cognitive decline.
• Aβ disrupts synaptic plasticity, favoring long-term depression (LTD), a cellular mechanism underlying memory formation.

Purpose of the Study:

• To investigate the role of the lipid phosphatase PTEN in Aβ-induced synaptic malfunction.
• To identify the molecular mechanisms by which Aβ affects PTEN and synaptic function.

Main Methods:

• Utilized cellular and animal models of Alzheimer's disease.
• Employed PTEN inhibition and overexpression strategies.
• Investigated Aβ-induced PTEN recruitment to the postsynaptic compartment using a PTEN knock-in mouse model lacking the PDZ motif and cell-permeable interfering peptides.

Main Results:

• Inhibition of PTEN rescued synaptic function and cognition in AD models.
• Overexpression of PTEN induced synaptic depression mimicking Aβ effects.
• Aβ triggers PDZ-dependent postsynaptic recruitment of PTEN, a critical step in Aβ-induced synaptic toxicity and cognitive deficits.

Conclusions:

• PTEN plays a crucial role in mediating Aβ-induced synaptic depression and cognitive impairment in Alzheimer's disease.
• Targeting the Aβ-PTEN interaction offers a potential therapeutic strategy for Alzheimer's disease.