The Dopamine Transporter Is a New Target for Ischemic Stroke

Area of Science:

• Neuroscience
• Pharmacology

Background:

• The dopamine transporter (DAT) regulates dopamine homeostasis and is linked to nervous system diseases.
• Its role in protection against ischemic stroke remains largely unknown.

Purpose of the Study:

• To investigate the involvement of DAT in ischemic stroke.
• To explore the potential of DAT inhibition as a therapeutic strategy.

Main Methods:

• In vivo microdialysis to measure dopamine levels in ischemic mouse brains.
• Utilized Slc6a3 (DAT gene) mutation and overexpression mouse models subjected to middle cerebral artery occlusion (MCAO).
• Administered levodopa (Madopar) and nomifensine, and assessed synaptic function (mEPSCs, mIPSCs) and neuronal survival.

Main Results:

• MCAO increased dopamine levels; Slc6a3 mutation reduced injury, while DAT overexpression worsened it.
• Nomifensine and Madopar demonstrated neuroprotective effects.
• Slc6a3 mutation and dopamine restored synaptic function and neuronal survival, effects blocked by D1 receptor antagonist SCH-23390.

Conclusions:

• DAT inhibition presents a potential strategy for preventing ischemic stroke.
• Dopamine and its D1 receptor are crucial for restoring synaptic function and protecting neurons during stroke.