Transcript of You Can Grow New Brain Cells. Here’s How by Sandrine Thuret at TED Talks…
Sandrine Thuret – Neural stem cell researcher
Can we, as adults, grow new nerve cells? There’s still some confusion about that question, as this is a fairly new field of research. For example, I was talking to one of my colleagues, Robert, who is an oncologist, and he was telling me, “Sandrine, this is puzzling. Some of my patients that have been told they are cured of their cancer still develop symptoms of depression.”
And I responded to him, “Well, from my point of view that makes sense. The drug you give to your patients that stops the cancer cells multiplying also stops the newborn neurons being generated in their brain.”
And then Robert looked at me like I was crazy and said, “But Sandrine, these are adult patients — adults do not grow new nerve cells.” And much to his surprise, I said, “Well actually, we do.” And this is a phenomenon that we call neurogenesis.
Now Robert is not a neuroscientist, and when he went to medical school he was not taught what we know now — that the adult brain can generate new nerve cells. So Robert, being the good doctor that he is, wanted to come to my lab to understand a little bit better the topic. And I took him for a tour of one of the most exciting parts of the brain when it comes to neurogenesis — and this is the hippocampus. So this is this gray structure in the center of the brain. And what we’ve known already for very long is that this is important for learning, memory, mood and emotion.
However, what we have learned more recently is that this is one of the unique structures of the adult brain where new neurons can be generated. And if we slice through the hippocampus and zoom in, what you actually see here in blue is a newborn neuron in an adult mouse brain. So when it comes to human brain — my colleague Jonas Frisén from the Karolinska Institutet, has estimated that we produce 700 new neurons per day in the hippocampus. So you might think this is not much, according to the billions of neurons we have. But by the time we will turn 50, we will have all exchanged the neurons we were born with in that structure with adult-born neurons.
So why are these new neurons important and what are their functions? First, we know that they’re important for learning and memory. And in the lab we have shown that if we block the ability of the adult brain to produce new neurons in the hippocampus, then we block certain memory abilities. And this is especially new and true for spatial recognition — so like, how you navigate your way in the city.
We are still learning a lot, and they are not only important for memory capacity, but also for the quality of the memory. And they will have been helpful to add time to our memory and they will help differentiate very similar memories, like: how do you find your bike that you park at the station every day in the same area, but in a slightly different position?
And more interesting to my colleague Robert is the research we have been doing on neurogenesis and depression. So in an animal model of depression, we have seen that we have a lower level of neurogenesis. And if we give antidepressants, then we increase the production of these newborn neurons, and we decrease the symptoms of depression, establishing a clear link between neurogenesis and depression. But moreover, if you just block neurogenesis, then you block the efficacy of the antidepressant.
So by then, Robert had understood that very likely his patients were suffering of depression even after being cured of their cancer, because the cancer drug had stopped newborn neurons to be generated. And it will take time to generate new neurons that reach normal functions.
So, collectively, now we think we have enough evidence to say that neurogenesis is a target of choice if we want to improve memory formation or mood, or even prevent the decline associated with aging, or associated with stress.
So the next question is: can we control neurogenesis? The answer is yes. And we are now going to do a little quiz. So I’m going to give you a set of behaviors and activities, and you tell me if you think they will increase neurogenesis or if they will decrease neurogenesis. Are we ready? Okay, let’s go.
So what about learning? Increasing? Yes. So learning will increase the production of these new neurons.
How about stress? Yes, stress will decrease the production of new neurons in the hippocampus.
How about sleep deprivations? Indeed, it will decrease neurogenesis.
How about sex? Oh, wow! Yes, you are right, it will increase the production of new neurons. However, it’s all about balance here. We don’t want to fall in a situation — about too much sex leading to sleep deprivations.
How about getting older? So the neurogenesis rate will decrease as we get older, but this is still occurring.
And then finally, how about running? I will let you judge that one by yourself.
So this is one of the first studies that was carried out by one of my mentors, Rusty Gage from the Salk Institute, showing that the environment can have an impact on the production of new neurons. And here you see a section of the hippocampus of a mouse that had no running wheel in its cage. And the little black dots you see are actually newborn neurons-to-be. And now, you see a section of the hippocampus of a mouse that had a running wheel in its cage. So you see the massive increase of the black dots representing the new neurons-to-be.