Disease mechanisms as Subtypes: Mitochondrial and bioenergetic dysfunction.

Area of Science:

• Neuroscience
• Neurodegenerative Diseases

Background:

• Parkinson disease (PD) is the second most prevalent neurodegenerative disorder globally.
• Current treatments for PD do not modify disease progression, highlighting a critical unmet medical need.
• Limited understanding of PD pathogenesis hinders the development of effective therapies.

Approach:

• This chapter reviews the literature supporting a model where specific neuronal traits contribute to PD.
• It examines how these traits may increase vulnerability to mitochondrial stress, age, genetic mutations, and environmental toxins.
• The discussion includes current knowledge gaps and translational implications.

Key Points:

• PD motor symptoms originate from the dysfunction and degeneration of select neuronal populations.
• Distinctive anatomic and physiologic traits of these neurons elevate mitochondrial stress.
• This vulnerability may explain the link between PD and factors like aging, genetics, and toxins.

Conclusions:

• The neuronal vulnerability model offers insights into PD pathogenesis.
• Understanding these mechanisms is crucial for designing future disease-modification strategies.
• Past failures in disease-modification trials underscore the need for novel therapeutic approaches targeting PD's core pathology.