Microglia form tiny tunnels with neurons to extract toxic proteins like tau and alpha-synuclein, then donate healthy mitochondria to repair damage. A new Neuron study shows this process protects against Alzheimer's and Parkinson's. Exercise, whole foods, occasional fasting, and sleep with good melatonin rhythms may strengthen these protective networks.
The secret to preventing Alzheimer's disease and Parkinson's disease? Tunneling nanotubes suck up these toxic proteins right out of the neurons. Sleep. But that's only half the story. Could microscopic tunnels in your brain hold the secret to preventing Alzheimer's disease and Parkinson's disease? It sounds like science fiction, right? But it's real, I swear. I'm referring to new data that has sent me into a state of just awe at the beauty of biology. Let's dig into it and explore this breaking science and how it may inform solutions to keep your brain healthy as you age and maybe as you dream too. Anyway, this new study was just published in Neuron and builds upon prior research about the fascinating topic of wait for it, tunneling nanotubes. Literal tunnels between cells, including cells of different types, that allow them to exchange internal components. To me, this is as cool as if I could reach out and just touch my friend Dave and transfer literal energy from me to him. Energy and information temporarily becoming one being and then separating and going our separate ways. Now, why is this important for brain health? Well, in this study, the researchers look specifically at tunneling nanotubes formed between neurons and a cell called microglia, which are the resident immune cells in the brain. Simply, you can think about microglia as the cleanup crew for the brain. But as we will find out together, they are also much, much more. Than just simple cleanup crew. Anyway, now what they found first is that microglia can form tunneling nanotubes with neurons, reaching out and forming cytoplasmic connections with neurons, and through these nanotubes suck up harmful protein aggregates that play roles in Alzheimer's disease, like tau, and Parkinson's disease, like alpha-synuclein. The microglia use these nanotubes to suck up these toxic proteins right out of the neurons. And then destroy them. That's pretty amazing, right? Isn't that just incredible? But that's not all. You see, these misfolded proteins that I just spoke about, they wreak havoc on neurons, contributing to oxidative stress and damaging mitochondria, the powerhouse of the cell that neurons need in tip-top shape so they can do their job and your brain can function normally and healthfully. Indeed, mitochondrial dysfunction is a hallmark of neurodegenerative diseases like Alzheimer's and Parkinson's. And these misfolded These proteins, the tau and the alpha-synuclein, cause mitochondrial dysfunction. So in removing misfolded proteins through nanotubes, microglia are providing a great service. But that's only half the story. The microglia also replenish the mitochondria, donating healthy mitochondria from microglia to neurons through these nanotubes. So at a high level, imagine microglia extending one nanotube arm to suck out poisonous proteins harming mitochondria, and extending one other nanotube arm to supply new, fresh, healthy mitochondria. How incredible is that? That's why I said I'm in awe of how beautiful biology is. And indeed, the researchers then show that this has functional consequences, with nanotubes formed between neurons and microglia leading to improvements in neuron metabolism. Reduced oxidative stress, and better overall mitochondrial function when the neurons were metabolically challenged. Again, I, I'm sorry I sound like a broken record, but this is so incredible. And I'm now sure you want to know, well, how do you increase the formation of these nanotubes in your brain to improve your brain health? Well, admittedly, it's a bit complicated. First and foremost, the formation of nanotubes seems to be part of a stress response. In other words, it's the presence of things like alpha-synuclein and tau that provoke the need for nanotubes in the first place and provoke their formation. And you definitely don't want more misfolded proteins. That's bad. Furthermore, it's not just about quantity of mitochondria transfer, but also about quality of the mitochondria. Indeed, in this study, they show that a common mutation in the LRRK2 gene that contributes to Parkinson's disease in humans, it It doesn't decrease mitochondrial transfer through nanotubes per se, but more likely decreases the quality of the transferred mitochondria such that neurons end up getting less metabolic support. The lesson here is you want to do what you need to do to keep your mitochondrial pool healthy. And fundamentally, this is everything you should do to maintain overall good metabolic health. Like exercising regularly, including a mix of resistance training and cardio, eating a whole food carbohydrate-appropriate diet for your activity level and metabolic state. For the brain, at least occasional bouts of ketosis may be beneficial, achieved either through carbohydrate restriction, ketogenic diets, or intermittent fasting. And for those with insulin resistance, keeping your carbs low to ensure your brain gets a healthy energy supply from ketones. These are all things you can do to support brain health and metabolic health. And of course, I'm not going to leave it out, sleep. In fact, some research even shows that melatonin, the sleep hormone, increases the formation of nanotubes. Now, I'm not suggesting you should supplement melatonin to look for the benefit of nanotube formation, but I am saying this is one more reason to prioritize sleep and a healthy circadian pattern. If it's a helpful image for you that will inspire positive behavior change, imagine getting in bed at a reasonable hour, reducing exposure to blue night light, or getting sunlight in the morning as interventions that may help form these microscopic nano tunnels that maintain a healthy brain. And on the topic of sleep, I do want to give here a quick plug to this really cool device that the kind folks over at MIT let me have to test. It's called Ellumind, and it uses built-in EEG sensors and bone conduction sound wave pulses to help you get to sleep faster. For more details, if this is something that interests you, click on the link to my newsletter in the video notes below. It'll direct you more information. It's really cool tech. Now, the discovery of tunneling nanotubes in the brain, really, it's nothing short of mind-blowing, at least to me. Tell me in the comments if you feel the same way. These microscopic bridges between neurons and microglia, they act both as cleanup crew and energy support systems, removing toxic proteins and delivering fresh, healthy mitochondria to keep our brains running optimally. It's a breathtaking example of biology's ingenuity, almost like a science fiction repair system operating at the cellular level. And while we don't yet have direct ways to increase nanotube formation, at least not great protocols, what we do know is that keeping your mitochondria healthy is essential. So as you reflect on this fascinating discovery, let it be a reminder that your daily habits shape your long-term brain health. Small choices, whether it's movement, exercise, diet, or sleep, could be helping these microscopic tunnels work their magic, keeping your mind sharp and resilient for the years to come.
