A Novel Mechanism of Spine Damages in Stroke via DAPK1 and Tau

Area of Science:

• Neuroscience
• Molecular Biology
• Stroke Research

Background:

• Synaptic spine loss is a key consequence of stroke, but its molecular drivers are not fully understood.
• Understanding the mechanisms of spine loss is crucial for developing effective stroke treatments.

Purpose of the Study:

• To investigate the molecular mechanisms underlying synaptic spine loss following stroke.
• To identify potential therapeutic targets for mitigating stroke-induced neuronal damage.

Main Methods:

• Utilized a mouse model of stroke.
• Investigated the interaction between DAPK1 and Tau protein.
• Examined DAPK1-mediated phosphorylation of Tau at Ser262.
• Assessed the effects of genetic DAPK1 kinase domain deletion and a DAPK1-Tau interaction blocking peptide on stroke outcomes.

Main Results:

• A direct interaction between DAPK1 and Tau was identified as a cause of spine loss and neuronal death in stroke models.
• DAPK1 phosphorylates Tau protein at Ser262 in cortical neurons of stroke mice.
• Genetic deletion of DAPK1 kinase domain or blocking the DAPK1-Tau interaction protected against spine damage.
• These interventions also improved neurological functions following stroke insults.

Conclusions:

• Disruption of the DAPK1-Tau interaction is a critical factor in stroke-induced neuronal damage.
• Targeting the DAPK1-Tau interaction presents a promising therapeutic strategy for clinical stroke management.