Inhibition of clathrin-mediated endocytosis prevents amyloid β-induced axonal damage

Area of Science:

• Neuroscience
• Cell Biology
• Pathology

Background:

• Alzheimer's disease (AD) involves amyloid-beta (Aβ)-induced axonal degeneration, a major pathological hallmark.
• The precise molecular targets to prevent Aβ-induced axonal degeneration remain largely unidentified.
• Growth cone collapse is a potential early event in Aβ-induced axonal damage.

Purpose of the Study:

• To investigate the role of Aβ in growth cone collapse.
• To identify the molecular mechanisms underlying Aβ-induced growth cone collapse.
• To evaluate the therapeutic potential of inhibiting this process in Alzheimer's disease.

Main Methods:

• Visualization of Aβ-induced growth cone collapse in cultured neurons.
• Analysis of the signaling pathways involved, including clathrin-mediated endocytosis and Ca(2+) signaling.
• Inhibition of clathrin-mediated endocytosis in vitro and in vivo models.
• Assessment of memory function in an Alzheimer's disease mouse model.

Main Results:

• Amyloid-beta was shown to induce growth cone collapse in cultured neurons.
• Clathrin-mediated endocytosis, likely via Aβ-Ca(2+) signaling, was identified as the trigger for growth cone collapse.
• Inhibition of clathrin-mediated endocytosis effectively prevented Aβ-induced axonal loss in vitro and in vivo.
• Blocking this pathway also ameliorated memory impairment in a mouse model of Alzheimer's disease.

Conclusions:

• Clathrin-mediated endocytosis plays a critical role in Aβ-induced growth cone collapse.
• This process is a key mediator of axonal degeneration and memory deficits in Alzheimer's disease.
• Targeting clathrin-mediated endocytosis presents a promising therapeutic strategy for Alzheimer's disease.