The “Missing Peptides” Behind AFib: Humanin + MOTS-c and the Fibrosis Switch

About this episode

This episode explores the role of mitochondrial-derived peptides in atrial fibrillation and their potential impact on heart health.

Atrial fibrillation is typically treated like an electrical glitch — rate control, rhythm control, anticoagulation. But this Deep Dive explores a newer frame: AFib may be driven by metabolic collapse and fibrotic remodeling rooted in mitochondrial dysfunction. Dr. Mike breaks down a May 5 Biomedicines paper titled “Humanin and MOTS-c attenuate atrial fibrillation by suppressing fibrosis and mitochondrial dysfunction,” highlighting why mitochondrial-derived peptides (MDPs) — Humanin and MOTS-c — may function as stress-responsive guardians that help preserve mitochondrial integrity, reduce oxidative stress, and blunt fibrosis. You’ll hear the key human tissue findings (both peptides downregulated in AFib atrial appendages), the biomarker signal (plasma MOTS-c inversely tracking NT-proBNP), the “Humanin paradox” (plasma up while atrial tissue down), and the mouse data showing peptide treatment reduced AFib inducibility and structural remodeling. The episode closes with a big question: if heart health is about fueling cellular engines, not just fixing wiring, how does that reshape aging medicine? (Educational content only, not medical advice.) - Article Discussed in Episode: Humanin…

People in this episode

Host: Dr. Mike Belkowski

Topics covered

• atrial fibrillation
• mitochondrial dysfunction
• metabolic collapse
• fibrosis
• peptides
• oxidative stress

Keywords

• AFib
• Humanin
• MOTS-c
• fibrosis
• mitochondrial dysfunction
• oxidative stress
• cellular health

Mentioned in this episode

Books & works: Humanin and MOTS-c Attenuate Atrial Fibrillation by Suppressing Fibrosis and Mitochondrial Dysfunction

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