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Peter Attia MD#114 – Eileen White, Ph.D.: Autophagy, fasting, and promising new cancer therapies
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At a glance
WHAT IT’S REALLY ABOUT
Eileen White Explains Autophagy's Double Role in Cancer and Health
- Eileen White describes how studying a viral BCL2 homolog and apoptosis-blocked tumor cells led her serendipitously to discover that cancer cells survive starvation by using autophagy.
- Genetic mouse experiments showed that adult mice lacking autophagy die of neurodegeneration in two to three months and cannot tolerate fasting, while established tumors die before the mice do when autophagy is shut off.
- White reconciles autophagy's protective role in normal tissue with its pro-tumor role by calling it context dependent: it limits chronic damage and inflammation before cancer arises but sustains tumors once they exist.
- Attia argues that the inability to measure autophagy in humans leaves fasting duration and frequency undosed, and the two discuss using metabolite signatures, mouse comparisons and philanthropic funding to fix this.
- White's future work focuses on autophagy inhibitors for cancer therapy, including how blocking autophagy raises inflammation and may make tumors respond to immune checkpoint blockade.
IDEAS WORTH REMEMBERING
5 ideasAutophagy discovery was serendipitous
White's lab found apoptosis-deficient tumor cells surviving in buffer with no nutrients, and electron microscopy revealed double-membrane autophagosomes that explained the survival.
Cancer cells keep autophagy elevated even when fed
White said normal cells have low autophagy in the fed state, whereas cancer cells show elevated autophagic flux that rises only modestly further under stress.
Some cancers depend on autophagy more than others
KRAS-driven lung and pancreatic cancers, BRAF-driven cancers and others are sensitive to autophagy loss, with RAS-driven lung cancer lacking LKB1 the most sensitive White has seen.
Autophagy's role is context dependent
In normal tissues such as liver and pancreas autophagy limits chronic damage and inflammation that drive cancer, but once a tumor exists, inhibiting autophagy harms the tumor more than normal tissue.
Fasting and autophagy inhibition are not equivalent
White cautioned against concluding that people with cancer should never fast, noting that caloric restriction limits tumor nutrients and its effect during therapy is not well understood.
WORDS WORTH SAVING
5 quotesI think it's a matter of thinking of the role of autophagy in cancer as being context dependent.
— Eileen White
And then we discovered that what these cells had done was turned on autophagy and were using that for survival.
— Eileen White
Imagine we had a drug that we knew could kill cancer, but we just didn't know how much to give or how often to give it. We wouldn't tolerate that for a minute. And yet in fasting, we have arguably the most potent tool, and certainly if not the most potent, probably one of the three most potent tools in which we can affect human health, and we don't have a clue how to dose it or what frequency with which to use it.
— Peter Attia
I think that if you look back over history, almost all cultures have fasting as part of their history. And I'm thinking that that is not by accident. I think they must have learned by trial and error that this was a healthy thing to do.
— Eileen White
So one day they're an adult mouse with autophagy, and then a few days later they're an adult mouse with no autophagy.
— Eileen White
High quality AI-generated summary created from speaker-labeled transcript.
