The Enzyme That Fasting, Exercise, Metformin & Ozempic All Switch On | Greg Steinberg | 276
Show notes
The AMP kinase pathway's role in cellular energy sensing, nutrient allocation, and its connections to health practices like fasting, exercise, and diet.
TOPICS DISCUSSED:
- Cellular energy basics: ATP/ADP/AMP as energy currencies; AMP kinase activates on low ATP to conserve and redirect resources, like a budget manager.
- AMP kinase mechanics: Heterotrimeric enzyme phosphorylating 100+ substrates; localizes dynamically in cytosol, mitochondria, nucleus to integrate signals.
- Nutrient detection: Senses fatty acids in fasting/ketogenic states, boosting fat oxidation and mitochondria independent of energy drops.
- Fasting/exercise impacts: Elevate AMP kinase for mitophagy, better fuel switching; mimic historical scarcity absent under modern constant feeding.
- mTOR relationship: AMP kinase inhibits mTOR to stop growth in low energy states; feedback loop disrupted by abundance, promoting tissue buildup.
- Disease links: Low AMP kinase in obesity/diabetes reduces flexibility; activation prevents cancer but may aid tumor survival in therapy.
- Drugs/diets: Metformin and GLP-1s like Ozempic activate AMP kinase for glucose control/weight loss; ketogenic diets activate at intermediate levels for fat efficiency.
ABOUT THE GUEST: Gregory Steinberg, PhD is a Professor of Medicine at McMaster University and co-directs the Centre for Metabolism, Obesity, and Diabetes Research, focusing on cellular energy sensors like AMP kinase.
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