TEDGlobal 2013
Molly Stevens: A new way to grow bone
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What does it take to regrow bone in mass quantities? Typical bone regeneration -- wherein bone is taken from a patient’s hip and grafted onto damaged bone elsewhere in the body -- is limited and can cause great pain just a few years after operation. In an informative talk, Molly Stevens introduces a new stem cell application that harnesses bone’s innate ability to regenerate and produces vast quantities of bone tissue painlessly.
Molly Stevens - Biomaterials researcher
Molly Stevens studies and creates new biomaterials that could be used to detect disease and repair bones and human tissue. Full bio
Molly Stevens studies and creates new biomaterials that could be used to detect disease and repair bones and human tissue. Full bio
Double-click the English transcript below to play the video.
00:12
As humans, it's in our nature
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to want to improve our health
and minimize our suffering.
and minimize our suffering.
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Whatever life throws at us,
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whether it's cancer, diabetes, heart disease,
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or even broken bones, we want to try and get better.
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Now I'm head of a biomaterials lab,
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and I'm really fascinated by the way that humans
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have used materials in really creative ways
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in the body over time.
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Take, for example, this beautiful blue nacre shell.
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This was actually used by the Mayans
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as an artificial tooth replacement.
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We're not quite sure why they did it.
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It's hard. It's durable.
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But it also had other very nice properties.
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In fact, when they put it into the jawbone,
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it could integrate into the jaw,
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and we know now with very sophisticated
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imaging technologies
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that part of that integration comes from the fact
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that this material is designed
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in a very specific way, has a beautiful chemistry,
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has a beautiful architecture.
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And I think in many ways we can sort of think
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of the use of the blue nacre shell and the Mayans
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as the first real application
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of the bluetooth technology.
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(Laughter)
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But if we move on and think throughout history
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how people have used different
materials in the body,
materials in the body,
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very often it's been physicians
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that have been quite creative.
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They've taken things off the shelf.
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One of my favorite examples
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is that of Sir Harold Ridley,
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who was a famous ophthalmologist,
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or at least became a famous ophthalmologist.
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And during World War II, what he would see
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would be pilots coming back from their missions,
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and he noticed that within their eyes
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they had shards of small bits of material
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lodged within the eye,
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but the very interesting thing about it
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was that material, actually, wasn't causing
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any inflammatory response.
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So he looked into this, and he figured out
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that actually that material was little shards of plastic
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that were coming from the canopy of the Spitfires.
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And this led him to propose that material
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as a new material for intraocular lenses.
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It's called PMMA, and it's now used
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in millions of people every year
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and helps in preventing cataracts.
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And that example, I think, is a really nice one,
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because it helps remind us that in the early days,
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people often chose materials
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because they were bioinert.
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Their very purpose was to
perform a mechanical function.
perform a mechanical function.
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You'd put them in the body
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and you wouldn't get an adverse response.
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And what I want to show you is that
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in regenerative medicine,
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we've really shifted away from that idea
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of taking a bioinert material.
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We're actually actively looking for materials
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that will be bioactive, that will interact with the body,
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and that furthermore we can put in the body,
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they'll have their function,
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and then they'll dissolve away over time.
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If we look at this schematic,
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this is showing you what we think of
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as the typical tissue-engineering approach.
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We have cells there, typically from the patient.
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We can put those onto a material,
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and we can make that material
very complex if we want to,
very complex if we want to,
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and we can then grow that up in the lab
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or we can put it straight back into the patient.
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And this is an approach that's
used all over the world,
used all over the world,
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including in our lab.
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But one of the things that's really important
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when we're thinking about stem cells
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is that obviously stem cells
can be many different things,
can be many different things,
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and they want to be many different things,
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and so we want to make sure that the environment
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we put them into has enough information
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so that they can become the right sort
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of specialist tissue.
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And if we think about the different types of tissues
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that people are looking at regenerating
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all over the world, in all the
different labs in the world,
different labs in the world,
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there's pretty much every tissue you can think of.
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And actually, the structure of those tissues
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is quite different, and it's going to really depend
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on whether your patient has any underlying disease,
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other conditions, in terms of how
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you're going to regenerate your tissue,
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and you're going to need to think about the materials
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you're going to use really carefully,
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their biochemistry, their mechanics,
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and many other properties as well.
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Our tissues all have very
different abilities to regenerate,
different abilities to regenerate,
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and here we see poor Prometheus,
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who made a rather tricky career choice
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and was punished by the Greek gods.
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He was tied to a rock, and an eagle would come
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every day to eat his liver.
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But of course his liver would regenerate every day,
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and so day after day he was punished
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for eternity by the gods.
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And liver will regenerate in this very nice way,
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but actually if we think of other tissues,
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like cartilage, for example,
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even the simplest nick and you're going to find it
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really difficult to regenerate your cartilage.
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So it's going to be very different from tissue to tissue.
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Now, bone is somewhere in between,
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and this is one of the tissues
that we work on a lot in our lab.
that we work on a lot in our lab.
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And bone is actually quite good at repairing.
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It has to be. We've probably all had fractures
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at some point or other.
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And one of the ways that you can think
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about repairing your fracture
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is this procedure here, called
an iliac crest harvest.
an iliac crest harvest.
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And what the surgeon might do
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is take some bone from your iliac crest,
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which is just here,
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and then transplant that
somewhere else in the body.
somewhere else in the body.
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And it actually works really well,
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because it's your own bone,
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and it's well vascularized,
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which means it's got a really good blood supply.
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But the problem is, there's
only so much you can take,
only so much you can take,
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and also when you do that operation,
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your patients might actually have significant pain
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in that defect site even two
years after the operation.
years after the operation.
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So what we were thinking is,
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there's a tremendous need
for bone repair, of course,
for bone repair, of course,
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but this iliac crest-type approach
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really has a lot of limitations to it,
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and could we perhaps recreate
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the generation of bone within the body
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on demand and then be able to transplant it
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without these very, very painful aftereffects
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that you would have with the iliac crest harvest?
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And so this is what we did, and the way we did it
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was by coming back to this typical tissue-engineering approach
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but actually thinking about it rather differently.
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And we simplified it a lot,
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so we got rid of a lot of these steps.
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We got rid of the need to
harvest cells from the patient,
harvest cells from the patient,
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we got rid of the need to put
in really fancy chemistries,
in really fancy chemistries,
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and we got rid of the need
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to culture these scaffolds in the lab.
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And what we really focused on
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was our material system and making it quite simple,
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but because we used it in a really clever way,
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we were able to generate enormous amounts of bone
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using this approach.
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So we were using the body
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as really the catalyst to help us
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to make lots of new bone.
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And it's an approach that we call
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the in vivo bioreactor, and we were able to make
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enormous amounts of bone using this approach.
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And I'll talk you through this.
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So what we do is,
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in humans, we all have a layer of stem cells
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on the outside of our long bones.
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That layer is called the periosteum.
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And that layer is actually normally
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very, very tightly bound to the underlying bone,
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and it's got stem cells in it.
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Those stem cells are really important
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in the embryo when it develops,
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and they also sort of wake up if you have a fracture
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to help you with repairing the bone.
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So we take that periosteum layer
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and we developed a way to inject underneath it
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a liquid that then, within 30 seconds,
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would turn into quite a rigid gel
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and can actually lift the
periosteum away from the bone.
periosteum away from the bone.
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So it creates, in essence, an artificial cavity
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that is right next to both the bone
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but also this really rich layer of stem cells.
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And we go in through a pinhole incision
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so that no other cells from the body can get in,
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and what happens is that that
artificial in vivo bioreactor cavity
artificial in vivo bioreactor cavity
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can then lead to the proliferation of these stem cells,
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and they can form lots of new tissue,
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and then over time, you can harvest that tissue
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and use it elsewhere in the body.
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This is a histology slide
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of what we see when we do that,
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and essentially what we see
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is very large amounts of bone.
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So in this picture, you can see the middle of the leg,
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so the bone marrow,
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then you can see the original bone,
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and you can see where that original bone finishes,
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and just to the left of that is the new bone
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that's grown within that bioreactor cavity,
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and you can actually make it even larger.
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And that demarcation that you can see
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between the original bone and the new bone
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acts as a very slight point of weakness,
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so actually now the surgeon can come along,
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can harvest away that new bone,
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and the periosteum can grow back,
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so you're left with the leg
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in the same sort of state
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as if you hadn't operated on it in the first place.
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So it's very, very low in terms of after-pain
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compared to an iliac crest harvest.
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And you can grow different amounts of bone
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depending on how much gel you put in there,
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so it really is an on demand sort of procedure.
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Now, at the time that we did this,
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this received a lot of attention in the press,
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because it was a really nice way
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of generating new bone,
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and we got many, many contacts
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from different people that
were interested in using this.
were interested in using this.
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And I'm just going to tell you,
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sometimes those contacts are very strange,
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slightly unexpected,
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and the very most interesting,
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let me put it that way, contact that I had,
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was actually from a team of American footballers
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that all wanted to have double-thickness skulls
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made on their head.
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And so you do get these kinds of contacts,
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and of course, being British
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and also growing up in France,
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I tend to be very blunt,
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and so I had to explain to them very nicely
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that in their particular case,
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there probably wasn't that much in there
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to protect in the first place.
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(Laughter)
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(Applause)
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So this was our approach,
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and it was simple materials,
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but we thought about it carefully.
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And actually we know that those cells
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in the body, in the embryo, as they develop
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can form a different kind of tissue, cartilage,
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and so we developed a gel that was slightly different
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in nature and slightly different chemistry,
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put it in there, and we were able to get
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100 percent cartilage instead.
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And this approach works really well, I think,
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for pre-planned procedures,
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but it's something you do have to pre-plan.
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So for other kinds of operations,
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there's definitely a need for other
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scaffold-based approaches.
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And when you think about designing
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those other scaffolds, actually,
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you need a really multi-disciplinary team.
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And so our team has chemists,
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it has cell biologists, surgeons, physicists even,
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and those people all come together
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and we think really hard about
designing the materials.
designing the materials.
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But we want to make them have enough information
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that we can get the cells to do what we want,
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but not be so complex as to make it difficult
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to get to clinic.
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And so one of the things we think about a lot
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is really trying to understand
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the structure of the tissues in the body.
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And so if we think of bone,
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obviously my own favorite tissue,
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we zoom in, we can see,
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even if you don't know anything
about bone structure,
about bone structure,
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it's beautifully organized,
really beautifully organized.
really beautifully organized.
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We've lots of blood vessels in there.
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And if we zoom in again, we see that the cells
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are actually surrounded by a 3D matrix
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of nano-scale fibers, and they give a lot
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of information to the cells.
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And if we zoom in again,
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actually in the case of bone, the matrix
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around the cells is beautifully organized
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at the nano scale, and it's a hybrid material
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that's part organic, part inorganic.
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And that's led to a whole field, really,
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that has looked at developing materials
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that have this hybrid kind of structure.
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And so I'm showing here just two examples
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where we've made some materials
that have that sort of structure,
that have that sort of structure,
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and you can really tailor it.
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You can see here a very squishy one
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and now a material that's also
this hybrid sort of material
this hybrid sort of material
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but actually has remarkable toughness,
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and it's no longer brittle.
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And an inorganic material
would normally be really brittle,
would normally be really brittle,
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and you wouldn't be able to have
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that sort of strength and toughness in it.
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One other thing I want to quickly mention is that
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many of the scaffolds we make
are porous, and they have to be,
are porous, and they have to be,
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because you want blood vessels to grow in there.
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But the pores are actually oftentimes
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much bigger than the cells,
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and so even though it's 3D,
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the cell might see it more
as a slightly curved surface,
as a slightly curved surface,
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and that's a little bit unnatural.
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And so one of the things you can think about doing
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is actually making scaffolds
with slightly different dimensions
with slightly different dimensions
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that might be able to surround your cells in 3D
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and give them a little bit more information.
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And there's a lot of work going
on in both of these areas.
on in both of these areas.
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Now finally, I just want to talk a little bit about
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applying this sort of thing to cardiovascular disease,
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because this is a really big clinical problem.
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And one of the things that we know is that,
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unfortunately, if you have a heart attack,
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then that tissue can start to die,
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and your outcome may not be very good over time.
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And it would be really great, actually,
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if we could stop that dead tissue
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either from dying or help it to regenerate.
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And there's lots and lots of stem
cell trials going on worldwide,
cell trials going on worldwide,
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and they use many different types of cells,
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but one common theme that seems to be coming out
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is that actually, very often, those cells will die
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once you've implanted them.
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And you can either put them into the heart
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or into the blood system,
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but either way, we don't seem to be able
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to get quite the right number of cells
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getting to the location we want them to
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and being able to deliver the sort of beautiful
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cell regeneration that we would like to have
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to get good clinical outcomes.
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And so some of the things that we're thinking of,
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and many other people in the field are thinking of,
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are actually developing materials for that.
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But there's a difference here.
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We still need chemistry, we still need mechanics,
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we still need really interesting topography,
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and we still need really interesting
ways to surround the cells.
ways to surround the cells.
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But now, the cells also
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would probably quite like a material
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that's going to be able to be conductive,
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because the cells themselves will respond very well
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and will actually conduct signals
between themselves.
between themselves.
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You can see them now
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beating synchronously on these materials,
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and that's a very, very exciting development
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that's going on.
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So just to wrap up, I'd like to actually say that
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being able to work in this sort of field,
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all of us that work in this field
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that's not only super-exciting science,
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but also has the potential
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to impact on patients,
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however big or small they are,
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is really a great privilege.
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And so for that, I'd like to thank all of you as well.
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Thank you.
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(Applause)
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ABOUT THE SPEAKER
Molly Stevens - Biomaterials researcherMolly Stevens studies and creates new biomaterials that could be used to detect disease and repair bones and human tissue.
Why you should listen
At Imperial College London, Molly Stevens heads a highly multidisciplinary research group that designs bioactive materials for regenerative medicine and biosensing. It's fundamental science with an eye to practical applications as healthcare products.
Among the products from her lab: an engineered bone, cardiac tissue suitable for use in transplants, and disease-sensing nanoparticle aggregates that change color in the presence of even tiny quantities of cancer-related enzymes, making early sensing possible. As Stevens told The Lancet: "It's right down at the nanoscience level. It's really exciting stuff, but it actually results in something very tangibly useful."
Molly Stevens | Speaker | TED.com