Mitochondria — research review 3

...And it's clear mitochondria are central to cellular energy. They're literally the power plants, generating the bulk of cellular ATP through oxidative phosphorylation.

Absolutely. We know several molecules interact with this pathway. For instance, SIRT3 tunes mitochondrial enzymes, supporting efficient energy production.

Right, and Urolithin A triggers mitophagy, which is the recycling of worn-out mitochondria, a crucial clean-up process. Then there's PQQ, stimulating the growth of entirely new mitochondria, a process called biogenesis.

And let's not forget α-KG, an intermediate in the TCA cycle that directly feeds mitochondrial energy production. These are all well-established roles. But what still feels genuinely unproven or unknown to you regarding mitochondrial health and longevity?

That’s a great question. While we know excess ROS, or reactive oxygen species, damages mitochondrial membranes and DNA, the precise threshold and long-term impact of modulating ROS levels for longevity in humans isn't fully clear. We have fascinating findings, like a 2017 study in Nature Medicine on Urolithin A, showing benefits in animal models and initial human trials, but definitive evidence for a direct, causal link between supplementing these molecules and significantly extending human lifespan is still developing.

I agree. The exact interplay and optimal ratios of these various mitochondrial support molecules – like how much Urolithin A vs. PQQ vs. SIRT3 activation is truly beneficial, and for whom – remains largely an open question. It's complex biochemistry, and individual variability is likely high.