Dr. Julie Andersen, Professor at the Buck Institute for Research on Aging, reveals how restoring mitochondrial recycling (mitophagy) protects brain cells from neurodegenerative diseases like Parkinson's and Alzheimer's. Discover why damaged mitochondria leak DNA into the cytoplasm to trigger chronic sterile neuroinflammation, how engineered T-regulatory cells cross the blood-brain barrier to clear pathology, and why Urolithin A restores cellular healthspan through a "calm not kill" approach.
Can we stop neurodegenerative diseases before symptoms ever appear? In this episode, Dr. Julie Andersen, leader of the Andersen Laboratory at the Buck Institute for Research on Aging, explains the molecular drivers of brain aging. Dr. Andersen explains how post-mitotic neurons rely entirely on mitophagy to eliminate damaged organelles. When mitochondrial clearance slows with age, damaged mitochondria leak mitochondrial DNA into the cytosol, activating the ancient cGAS-STING immune sensor and sparking chronic neuroinflammation. She shares the findings from her landmark studies showing how environmental stressors impact brain support cells, and why blanket destruction of senescent cells can be counterproductive. Dr. Andersen highlights hopeful translational solutions: from engineered autologous T-regulatory cells that cross the blood-brain barrier to target plaques and produce anti-inflammatories on demand, to a "calm not kill" senomorphic approach using Urolithin A to suppress toxic SASP secretions without harming vital brain cells.
🔬 Scientific Citations & References Mentioned:
1. Chinta, S. J., et al., & Andersen, J. K. (2018). Cellular Senescence Is Induced by the Environmental Neurotoxin Paraquat and Contributes to Neuropathology Linked to Parkinson's Disease. Cell Reports, 22(4), 930-940.
2. Andersen, J. K., et al. Development of Mitophagy-Inducing Small Molecules (MIC) as Therapeutics for Aging and Alzheimer's Disease. Geroscience / Nature Aging.
3. Ballesteros-Alvarez, J., Andersen, J. K., et al. Urolithin A Restores Mitophagy, Reduces Cytosolic mtDNA Leakage, Downregulates cGAS-STING, and Attenuates Paracrine Senescence in Aging CNS Models.
4. Sharma, A., & Andersen, J. K. Urolithin A acts as a senomorphic agent to suppress the senescence-associated secretory phenotype (SASP) without inducing cell death.
🌐 Connect with Dr. Julie Andersen & The Buck Institute:
• Buck Institute Faculty Profile: https://www.buckinstitute.org/lab/andersen-lab/
• Buck Institute for Research on Aging: https://www.buckinstitute.org
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