Is Parkinson’s a Whole-Body Disease? Rethinking the Immune System’s Role

For decades, Parkinson’s disease has been viewed primarily as a disorder of dopamine-producing brain cells.

But what if that’s only part of the story?

In this episode of Research Renaissance, host Deborah Westphal sits down with Dr. Rebecca Wallings, Assistant Professor of Neurology at Indiana University’s Stark Neuroscience Research Institute, to explore a groundbreaking shift in how we understand Parkinson’s.

Dr. Wallings explains why the immune system — and specifically immune cell exhaustion — may be a key driver of disease progression. She challenges the prevailing “too much inflammation” narrative and introduces the provocative idea that Parkinson’s may involve a burned-out, aging immune system rather than simply an overactive one.

This conversation dives into:

• The role of lysosomes in immune and brain cells
  
  
• Why most preclinical Parkinson’s models may overlook aging
  
  
• Gut-first vs. brain-first Parkinson’s subtypes
  
  
• Immune exhaustion and its connection to aging
  
  
• Lifestyle factors that may influence disease progression
  
  
• Why future therapies may need to be personalized
  
  

Key Takeaways

• Parkinson’s may be a whole-body condition, not just a brain disease.
  
  
• Aging dramatically alters immune function — yet many models study “young” immune systems.
  
  
• Immune exhaustion may prevent proper resolution of inflammation.
  
  
• Non-motor symptoms (constipation, sleep disorders, loss of smell) can appear decades before diagnosis.
  
  
• Stratifying patients by biological immune age could transform treatment strategies.

About Our Guest

Dr. Rebecca Wallings
Assistant Professor of Neurology
Indiana University – Stark Neuroscience Research Institute

Dr. Wallings studies the role of immune cell exhaustion and aging in Parkinson’s disease, challenging traditional pathology-focused models and exploring translational therapeutic strategies.

Resources Mentioned

• Stark Neuroscience Research Institute
• Research on immune checkpoint inhibitors
• Studies on REM Behavior Disorder and Parkinson’s risk
• Research into biological aging clocks

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Technical Podcast Support by Jon Keur at Wayfare Recording Co.