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Can the billion-dollar bet on biotech finally reverse aging?
Business Insider
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10/1/2024
Billionaires are backing top scientists racing to develop tech that could reverse aging. Cellular reprogramming promises to rejuvenate the body… but how does it work, and is it safe?
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Tech
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00:00
Imagine if you could turn back the clock to reverse aging, get rid of wrinkles, gray hair,
00:07
or see 2020 again.
00:09
Well, there's a handful of startups trying to do exactly that, and billionaires are pouring
00:14
money into this, hoping the tech will be developed before it's too late for them.
00:18
These tech billionaires, they like their lives a lot and they just don't want to give it
00:23
up.
00:24
So they're driving a lot of this.
00:26
Scientists are trying to manipulate human cells to rejuvenate your body.
00:30
It's a technique they're calling cellular reprogramming, and it could be reality in
00:35
just a couple of years.
00:37
I'm unapologetically afraid of dying.
00:39
If you cure aging and people have the mortality of young adults, then they would live thousands
00:44
of years.
00:45
But how does this work?
00:47
Should we worry about side effects?
00:49
And how close are we really to cheating death?
00:52
I'm Hilary Brick, and I'm a health correspondent here at Business Insider.
00:58
Aging is this inevitable and progressive process of loss of viability and increase in vulnerability.
01:04
So once you reach about age 30, your chance of dying doubles roughly every eight years.
01:08
And you see that across populations, from poor countries to wealthy countries, it doesn't
01:12
matter.
01:13
That's very consistent across populations.
01:17
But to understand aging, we need to think about how it all starts, because we start
01:22
out in a much different, more flexible shape.
01:25
Picture a fertilized egg, the single cell where we all begin.
01:31
That cell could become anything.
01:33
It's what we call a stem cell.
01:36
Stem cells are versatile and can turn into any type of cell your body needs.
01:41
And then as they develop, the stem cells become more specialized.
01:46
Scientists might say they're differentiated cells, but really, it's kind of like they're
01:50
getting job titles.
01:51
Like a skin cell, or a brain cell, or a hair cell.
01:56
Our stem cells are like our body's built-in rejuvenation system.
01:59
They're constantly turning over, making new stuff for us, keeping our body going with
02:03
new hair, new skin, fresh neurons.
02:06
These stem cells are required for regenerating tissue, because our tissues in our cells die
02:12
and have to be constantly replaced.
02:14
That's why, you know, when you fall down and get a bruise, it quickly repairs itself.
02:20
As we age, the number of these stem cells decreases and their efficiency declines.
02:25
So our body has a harder time repairing and replacing tissues, and this leads to slower
02:30
healing and more signs of aging all over.
02:33
Aging is really an accumulation of changes.
02:37
A lot of it is chemical damage, and eventually things start becoming dysfunctional.
02:44
That build-up of damage over time as we age creates problems.
02:48
Some scientists think of it kind of like a photocopier or something, like where the more
02:53
copies you make, the more worn out it gets and the more little glitches and errors it
02:59
has on it.
03:00
This damage in our DNA is kind of like glitches in our human programming.
03:05
Over time, the errors cause issues because our bodies use that code to make the proteins
03:11
that sustain our whole life and fight infections and thrive as people.
03:16
When the instructions for our cells are damaged, they stop working properly, which is part
03:20
of what happens during aging.
03:22
So when scientists talk about reprogramming, what do they mean?
03:27
So this idea of reprogramming is, could we take cells that are fully differentiated,
03:34
like the skin cell or muscle cell or whatever, and program them to go backwards to the stem
03:40
cell that originally generated them?
03:43
Or even, you know, make them somehow biologically younger.
03:49
The idea of reprogramming your cells to slow down aging is not that new.
03:54
In 2012, a Japanese scientist and former surgeon named Shinya Yamanaka won the Nobel Prize
04:01
for his discovery.
04:04
Yamanaka figured out that you can use four special genes to reset your cells back into
04:09
stem cells, and that set of four genes are called the Yamanaka factors.
04:14
They contain instructions that can reset a cell back to an undifferentiated state, making
04:19
it like new again, essentially rewriting the cell's program and guiding it back to a
04:24
more flexible, stem-like state.
04:27
This was a big deal for aging science.
04:31
These newly reset cells, known as induced pluripotent stem cells, can then turn into
04:36
any type of cell you need, and could potentially be used to grow new tissues or organs, like
04:43
younger skin or a new heart.
04:45
Typically, when researchers do cellular reprogramming in the lab, they use an inactivated virus
04:51
to inject the Yamanaka factors.
04:53
It's pretty much the same technique they use when you get a vaccine.
04:57
So you essentially have a virus, and what this virus does is it has those four factors,
05:02
and it transports them to the cells, and they have to be regulated, so you don't want
05:06
too much of it, not too little, so you have to get it right.
05:10
But at least in animal models, this is possible to do now.
05:14
In 2006, Yamanaka showed this can be done in mice.
05:18
Then in 2007, the next year, he started on human cells, first with skin, and his experiment
05:24
was quite successful.
05:26
What scientists and some startups are trying to do now is to partially reprogram some cells
05:30
so they act younger, but don't go all the way back to being an embryonic stem cell again.
05:36
It retains its identity.
05:37
It remains a liver cell or a brain cell or a skin cell, but it's rejuvenated.
05:42
And so that has a lot of potential, because if you can rejuvenate cells without them losing
05:46
their identity, that's what you want.
05:49
But even if these kinds of treatments become available, it wouldn't be like an 80-year-old
05:53
can suddenly turn 20 again.
05:55
Maybe it could be rewinding that receding hairline, ditching arthritis, regenerating
06:01
heart muscle after a heart attack, or healing neurons in your retina so you can see better
06:05
as you age.
06:06
I personally would love it if they could regenerate cartilage in my joints, you know, at my age.
06:14
That would be great.
06:15
And also, while they're at it, they could also regenerate hair, you know, so that would
06:20
be a billion-dollar, multi-billion-dollar discovery, if you could safely regenerate
06:25
hair of all men, okay?
06:28
There are even loftier goals, like curing Parkinson's, regrowing parts of the brain,
06:32
or rejuvenating your entire body.
06:35
If you have a young brain, it doesn't develop Alzheimer's or dementia anymore.
06:41
So if you can turn your brain young, you will make you resilient to diseases.
06:46
Maybe even it will treat and cure diseases, we don't know.
06:49
So that is the promise of the field, is that if you make your organs younger, they'll
06:53
be more resilient to diseases.
06:55
Now most of these ideas are in the testing and research stage, and not available as treatments
06:59
just yet.
07:00
But some scientists are close.
07:02
I chatted with Johnny Heward, who's restoring joint cartilage for elite athletes using their
07:06
own stem cells.
07:07
We take your bone marrow that contains stem cells and we re-inject that into your knee.
07:12
He's also experimenting with one form of cellular reprogramming using so-called epigenetic drugs,
07:18
which can change the way our genes behave, in some cases making them act younger again.
07:23
We have used cells from old people.
07:27
We took the cells, came in the lab, looked at their epigenetic expression was going down,
07:34
use epigenetic drugs to bring this back up, and the cells look younger.
07:39
So would you say that that's a form of cellular reprogramming then, what you're doing with
07:44
those patients?
07:45
Yes.
07:46
It is a form of cellular reprogramming because what I did is I harvest stem cells from you,
07:51
take drugs to regulate your epigenetic expression and make those cells younger.
07:57
So I rejuvenate your cells.
07:58
But so far, this treatment is just lab work.
08:01
It would eventually require FDA approval to put the reprogrammed cells back into people's
08:05
bodies.
08:06
I'm not saying that this thing will never be approved three years from now, but it's
08:11
not approved today.
08:12
But the potential of this technology has sparked visionary ideas about the future.
08:17
I imagine a future where children or babies, even before they're born, they're engineered
08:22
not to age, or at least engineered to be resistant to diseases like Alzheimer's disease.
08:27
If you cure aging and people have the mortality of young adults, then they would live thousands
08:32
of years.
08:33
You could still die, of course, but you wouldn't have this exponential increase in mortality.
08:38
Recently, we've seen an explosion of research into this area, and money is flocking into
08:44
cellular reprogramming and other longevity treatments.
08:49
Jeff Bezos, for example, is an investor in Altos Labs.
08:53
Altos is a pretty secretive startup based in California that has recruited some of the
08:57
most elite aging scientists in the world.
09:00
The company has at least $3 billion in funding.
09:03
Another big-deal longevity scientist is Harvard professor David Sinclair.
09:08
He's behind a bunch of different longevity companies, but he has experimented with cellular
09:13
reprogramming already on mice and monkeys, and he's hoping to do people next.
09:18
For example, he conducted an experiment with two mice from the same litter, same DNA.
09:23
They're like twins, except one is biologically older now because it's had its DNA manipulated
09:28
to act older, mimicking the stress that a body goes through as it ages.
09:32
Then, Sinclair's team says they used cellular reprogramming to restore the old mouse's organs
09:37
back to a more youthful state.
09:39
For example, they found that they could safely reverse age-related blindness and rejuvenate
09:44
the kidneys and the muscle in the mouse.
09:47
Sinclair started a private company called Life Biosciences.
09:50
It's raised at least $175 million so far.
09:54
They're gunning to get this technology into people's eyeballs and cure age-related blindness.
09:59
He says the eye injection will be ready soon, maybe within a year or two, but it remains
10:04
to be seen how quickly it can actually move from labs into clinics.
10:08
And there are other people you may know of who are investing in cellular reprogramming, too.
10:13
I really think what it's like is, um...
10:16
Sam Altman, the billionaire behind Chat GPT, is also gunning for cellular reprogramming.
10:21
He's poured $180 million into his longevity startup, RetroBiosciences.
10:27
I interviewed the CEO of RetroBiosciences, and he told me they're trying a slightly different
10:33
approach to cellular reprogramming.
10:35
Take the cells out of someone's body, then reprogram them and pop them back in.
10:39
He thinks it might be safer that way.
10:42
The field is maturing because people and investors and rich folks think that there's
10:47
going to be commercial outputs in it.
10:50
That they'll be able to make money out of it.
10:52
That means that we're going to be able to have a product from the field, which is what I want.
10:58
People love to hear that aging is going to be solved and we're all going to live healthily
11:02
for a very long time.
11:04
But the reality is, biology is kind of complicated.
11:08
Tweak a gene here, insert a new program there, and you'll likely kick off multiple other
11:12
processes in the body, including some that could be harmful and may not be immediately
11:17
obvious either.
11:18
Mice have benefited from this kind of reprogramming.
11:23
But to go from there to ask, you know, can we now start using this in humans?
11:31
It's a long stretch.
11:32
And the reason is that we would want to make sure that over decades, you know, it's not
11:39
going to increase the risk of cancer.
11:40
What's the point of living an extra 10 years if it's going to cause cancer, increase the
11:45
risk of cancer before that?
11:47
The point Ramakrishnan raises here is important.
11:50
In the early days of using Yamanaka's reprogramming technique, scientists often saw that cells
11:55
they created could form teratomas, which are a type of tumor.
11:58
This happened because two of the four genes used in the reprogramming process are oncogenes.
12:04
Oncogenes are genes that can divide indefinitely, and that poses a cancer risk.
12:08
Always keep in mind that an immortal cell is a cancer cell.
12:11
So the big danger of partial reprogramming and cellular rejuvenation and reprogramming
12:16
itself is cancer.
12:18
So we actually know from studies in mice that if you reprogram the cells a lot, in the mouse
12:22
they become cancer.
12:24
And obviously you don't want that.
12:25
So there is this, this balance you have to achieve.
12:28
You want to do it in a safe way that allows you to rejuvenate cells without turning them
12:32
into cancer.
12:33
There's also a chance that continuously expressing these Yamanaka factors could lead to liver
12:38
failure or make your intestine shut down.
12:40
And there may be other toxic effects we haven't even considered yet.
12:44
I think for several years now we've seen like the Silicon Valley billionaires trying to
12:50
go after the medical field and pretty limited success.
12:54
One of the most stunning and memorable failures in recent memory was probably the blood testing
12:58
company Theranos, which ended up basically being a total sham.
13:05
These tech entrepreneurs, CEOs, business people, and billionaires have all been really successful
13:10
in the world of computing, technology, and it seems like they're trying to take this
13:14
very same technological approach to what are very complex, poorly understood biological
13:20
problems.
13:21
So it remains to be seen if you can reprogram a person like you would a computer.
13:26
But it's an idea that's attracting a lot of money and a lot of scientists.
13:31
I think it's wonderful that there is more activity, there's more interest, and there's
13:34
more investment in the field.
13:35
It's just so that there's more potential.
13:37
Curing aging would be a monumental achievement and it would be a huge change in medicine,
13:45
in healthcare, in society.
13:47
I think that would be magnificent and a huge triumph of civilization.
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