The zona incerta system: Involvement in Parkinson's disease

Area of Science:

• Neuroscience
• Neurology
• Movement Disorders

Background:

• Parkinson's disease (PD) involves the degeneration of the nigrostriatal dopamine system.
• The basal ganglia network is the traditional focus, but the zona incerta (ZI) is emerging as a key therapeutic target.

Purpose of the Study:

• To review clinical and animal studies on the zona incerta's role in Parkinson's disease.
• To summarize evidence supporting the ZI as a potential therapeutic target for PD symptoms.

Main Methods:

• Review of human clinical studies involving subthalamotomy and deep brain stimulation (DBS) of the ZI.
• Analysis of animal studies using optogenetics, chemogenetics, behavioral assays, and neural recordings.

Main Results:

• ZI interventions (subthalamotomy, DBS) alleviate motor symptoms like rigidity, bradykinesia, tremors, and speech dysfunction in PD patients.
• DBS of the ZI impacts non-motor symptoms including pain, anxiety, and depression.
• Animal studies elucidate the roles of ZI GABAergic and glutamatergic neurons in PD-related locomotion and coordination.

Conclusions:

• The zona incerta is a critical structure involved in Parkinson's disease pathophysiology.
• Targeting the ZI offers potential for novel therapeutic strategies for both motor and non-motor symptoms of PD.