Pedunculopontine nucleus: An integrative view with implications on Deep Brain Stimulation

Area of Science:

• Neuroscience
• Movement Disorders
• Neurosurgery

Background:

• The pedunculopontine nucleus (PPN) is a brainstem nucleus historically linked to motor control and arousal.
• Histopathological studies suggest PPN dysfunction contributes to Parkinson's disease (PD) symptoms.
• Axial symptoms in PD remain a challenge for current therapeutic strategies.

Purpose of the Study:

• To review the anatomy and function of the PPN in healthy and diseased brains.
• To challenge classical views on PPN function with recent findings.
• To outline the current and future role of PPN deep brain stimulation (DBS) in PD.

Main Methods:

• Literature review of historical and recent studies on the PPN.
• Analysis of findings from experiments in Parkinsonian monkeys.
• Summary of clinical trials investigating PPN DBS for gait disorders in PD.

Main Results:

• The PPN's role extends beyond its classical associations, implicating it in basal ganglia networks.
• PPN DBS shows potential for treating axial symptoms in PD, addressing an unmet clinical need.
• Recent findings necessitate a re-evaluation of established PPN functions.

Conclusions:

• The PPN is a promising target for deep brain stimulation in Parkinson's disease.
• Further research and clinical trials are crucial to optimize PPN DBS for PD patients.
• Understanding the PPN's complex role is vital for advancing movement disorder treatments.