Modern Healthspan

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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Dr. Martin Picard, head of the Mitochondrial Psychobiology Laboratory at Columbia University, explains how cellular energy constraints and emotional stress drive biological aging. Discover how psychological allostatic load burns up to 60% more cellular energy, why hair graying is naturally reversible upon recovery, and how providing periods of physiological rest allows your mitochondria to restore cellular healthspan.

Can psychological stress and mindset directly change the biology of your mitochondria? In this episode, Dr. Martin Picard, Associate Professor of Behavioral Medicine at Columbia University Irving Medical Center, breaks down his pioneering field of mitochondrial psychobiology. Dr. Picard reveals how acute and chronic mental stressors signal directly to glucocorticoid receptors inside mitochondria, driving damaged cells into a costly state of hypermetabolism where they burn 60% more energy simply to stay alive. This metabolic burden steals vital energy away from core anti-aging maintenance, including DNA repair, telomere integrity, and cellular cleanup. He shares the science behind his landmark study demonstrating that human hair graying is naturally reversible when psychological stress is relieved, proving that biological aging is not a rigid linear decline but a malleable process with substantial wiggle room. Dr. Picard also explores why damaged mitochondria undergo herniation and leak cell-free mitochondrial DNA (cf-mtDNA) into the cytoplasm and bloodstream, triggering innate immune alarms and sterile inflammation. Finally, we discuss actionable strategies to measure and protect your bioenergetic health, from VO2 max and cellular stress biomarkers like GDF-15 to the restorative power of meditation and physiological rest.

🔬 Scientific Citations & References Mentioned: 1. Rosenberg, A. M., et al. (2021). Quantitative mapping of human hair graying and reversal in relation to life stress. eLife, 10, e67437.
2. Picard, M., & McEwen, B. S. (2018). Psychological Stress and Mitochondria: A Systematic Review. Psychosomatic Medicine, 80(2), 141-153.
3. Picard, M., Juster, R. P., & McEwen, B. S. (2014). Mitochondrial allostatic load puts the 'gluc' back in glucocorticoids. Nature Reviews Endocrinology, 10(5), 303-310.
4. Sturm, G., et al., & Picard, M. (2023). Overactive cell metabolism linked to biological aging / Hypermetabolism in human cellular aging. Communications Biology.

🌐 Connect with Dr. Martin Picard:
• Website: https://martinpicard.energy
• Substack (The Science and Experience of Energy): https://martinpicard.substack.com
• Substack profile - substack.com/@martinpicard
• LinkedIn - linkedin.com/in/mitopsychobio
• X - x.com/MitoPsychoBio
• Instagram - instagram.com/martinpicard.energy/

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Join Dr. John Sedivy, Director of the Center on the Biology of Aging at Brown University, as he explains how ancient jumping genes (LINE-1 retrotransposons) awaken as our epigenome decays, driving chronic sterile inflammation and cellular aging. Discover how reverse transcriptase inhibitors and epigenetic maintenance can slow biological aging clocks and protect tissue healthspan.

What if ancient viral elements embedded in our DNA wake up as we age to drive chronic systemic inflammation? In this episode, Dr. John Sedivy breaks down his groundbreaking discovery of LINE-1 retrotransposons ("jumping genes"). Dr. Sedivy explains how age-related heterochromatin decay allows dormant LINE-1 elements to replicate, generating cytoplasmic cDNA that triggers the cGAS-STING innate immune pathway and fuels the pro-inflammatory SASP in senescent cells. He discusses how repurposing generic reverse transcriptase inhibitors like Lamivudine can halt this cascade, lower systemic inflammatory markers, and profoundly decelerate Horvath DNA methylation aging clocks. Learn about ongoing clinical trials in Alzheimer's disease, government-backed ARPA-H longevity programs, and how preserving epigenetic integrity can combat inflammaging.

🔬 Scientific Citations & References Mentioned: 1. De Cecco, M., et al. (2019). L1 drives IFN in senescent cells and promotes age-associated inflammation. Nature, 566(7742), 73-78. 2. Kelsey, K., Sedivy, J. M., et al. (2025/2026). Retrotransposon Activation in the Aged and Alzheimer's Disease Brain Examined by Nanopore Long-read DNA Sequencing. 3. Simon, M., et al. (2019). LINE1 derepression in aged and senescent tissues promotes inflammation and can be targeted by reverse transcriptase inhibitors. Cell Metabolism / Nature Aging.

🌐 Links in this video: - Center on the Biology of Aging at Brown University: https://biologyofaging.brown.edu - bioRxiv Preprints: https://www.biorxiv.org

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Join us as Dr. Irina Conboy, former UC Berkeley professor and Chief Science Officer at Generation Lab, reveals a groundbreaking metabolic senolytic discovery. Learn how combining Dichloroacetate (DCA), Metformin, and a 10-fold lower dose of Navitoclax selectively eliminates senescent and cancer cells, extending post-treatment lifespan by 41.7% in old mice without inducing frailty or platelet toxicity

Cellular senescence and cancer share a critical metabolic vulnerability: damaged, short-circuiting mitochondria and an inflexible reliance on glycolysis for survival. While first-generation senolytics like Navitoclax (ABT-263) demonstrated high potency, severe clinical side effects like platelet destruction (thrombocytopenia) stalled their translation. In this episode, Dr. Irina Conboy breaks down her lab's landmark 2026 paper in Aging. By utilizing Dichloroacetate (DCA) to force pyruvate into damaged mitochondria and Metformin to inhibit Complex I ATP synthesis, the team created a metabolic vise that drains energy exclusively in cancer and senescent cells. With their defenses compromised, a 10-fold reduced dose of Navitoclax triggers selective apoptosis while completely sparing healthy human tissues and platelets. Dr. Conboy explains how intermittent administration in 18-month-old mice extended post-treatment lifespan by 41.7% (+102 days) and improved treadmill endurance with zero increase in frailty. She also shares Generation Lab's upcoming pharmacological injectable designed to replace invasive therapeutic plasma exchange (TPE).

🔬 Scientific Citations & References Mentioned: 1. Robinson, Z., Amiri, P., Mehdipour, M., Conboy, M. J., & Conboy, I. M. (2026). Selective targeting of cancer and senescence via shared metabolic shifts extends lifespan of old mice. Aging, PMID: 42474306. 2. Jeon, O. H., et al., Campisi, J., & Conboy, I. M. (2022). Systemic induction of cellular senescence by old blood. Nature Metabolism, 4(8), 998-1006. 3. Mehdipour, M., et al., & Conboy, I. M. (2020). Rejuvenation of three germ layers tissues by exchanging old blood plasma with saline-albumin. Aging, 12(10), 8790-8819. 🌐 Links in this video: - Generation Lab: https://generationlab.biotech

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Join us as Dr. Connie Weaver, Distinguished Research Professor at San Diego State University and National Academy of Medicine member, reveals the hidden science of bone loss, calcium bioavailability, and the gut-bone axis. Discover why fractures kill more people than most realize, why modern plant-forward diets are inadvertently blocking mineral absorption, how soluble corn fiber halts postmenopausal bone loss, and the strict 500mg calcium dosing rule you need to know.

Osteoporotic fractures outnumber new diagnoses of heart disease and cancer combined, with 20% of hip fracture patients dying within 12 months. Yet bone health remains one of the most overlooked pillars of healthspan. In this episode, we sit down with Dr. Connie Weaver, one of the world's foremost authorities on mineral metabolism and bone remodeling. Dr. Weaver explains why nutrition plays a permissive role alongside resistance exercise, how the estrogen crash during menopause accelerates osteoclast bone resorption, and why high-dose Vitamin D trials have failed to stop fractures in the general population. She breaks down her landmark 3-decade research modeling calcium bioavailability across global diets (now integrated into Cronometer), revealing how high-oxalate and high-phytate plant diets are driving widespread calcium deficits. Finally, Dr. Weaver shares her groundbreaking discovery on the gut-bone axis - demonstrating how prebiotic soluble corn fiber feeds fiber-fermenting bacteria to stop postmenopausal bone loss - and clarifies the truth about calcium supplements and arterial plaque.

🔬 Scientific Citations & References Mentioned
1. Weaver, C. M., et al. (2016). Soluble corn fiber increases bone calcium retention in postmenopausal women in a dose-dependent manner. The American Journal of Clinical Nutrition, 104(3), 837-843.
2. Weaver, C. M., et al. (2021). Modeling calcium bioavailability in US and global diets: Impact of phytate, oxalate, and plant-forward dietary shifts. The Journal of Nutrition, 151(10), 3120-3128.
3. Whisner, C. M., & Weaver, C. M. (2016). Soluble corn fiber enhances calcium absorption and alters the gut microbiome in adolescent males and females. British Journal of Nutrition, 116(11), 1849-1856.
4. Weaver, C. M., et al. (2016). Calcium plus vitamin D supplementation and risk of fractures: an updated meta-analysis from the National Osteoporosis Foundation. Osteoporosis International, 27(1), 367-376.

🌐Links in this video
- Dr. Connie Weaver's SDSU Faculty Page: https://ens.sdsu.edu/people/faculty/weaver-connie - Dr. Connie Weaver on LinkedIn: https://www.linkedin.com/in/connie-weaver-4754a39/ - USDA FoodData Central: https://fdc.nal.usda.gov/ - Cronometer (featuring Dr. Weaver's Bioavailability Model): https://cronometer.com/

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