Removing Senescent Cells Halts Many Signs...
VidX 02 Nov 2011
http://www.wired.com...lar-senescence/
Mind 02 Nov 2011
One part of the Wired article that was confusing to me is this part:
Baker’s team, led by himself and Mayo Clinic gerontologist Jan van Deursen, started by engineering a mouse strain that aged unnaturally fast. When they inactivated p16 and other senescence-linked genes in embryonic mice, aging proceeded normally.
It hinted at the importance of cellular senescence, but wasn’t so convincing as if the mice had senesced over the course of their lives, then been treated. To accomplish this, Baker and van Deursen designed a fast-aging mouse strain that would, upon receiving a drug trigger, expel p16-producing cells from fatty tissues, muscles and eyes.
So when they inactivated P16 and related genes, the fast aging mice, aged at their normal fast pace? Then when they used a drug trigger to get rid of senescent cells, the fast aging mice did not age as fast? Is that correct?
Elus 02 Nov 2011
-Prevented cataracts
-Delayed muscle loss
-Increased preservation of fat tissue
-Increased energy output!
-Prevented hunchback spine condition (lordokyphosis)
This is pretty incredible stuff. This is a MAJOR vindication of SENS, as removing senescent cells is essentially apoptoSENS.
Interestingly mice died from heart failure. Check graph C out and it might explain why (Very low relative expression of their gene in the heart cells - what would have happened if more senescent cells were removed from the heart? Maybe good maybe bad.):
Edited by Elus, 02 November 2011 - 09:58 PM.
MrHappy 02 Nov 2011
Anthony_Loera 03 Nov 2011
I thought Saikosaponin A, but I would need to test it of course.
A
maxwatt 03 Nov 2011
Clearance of p16Ink4a-positive senescent cells delays ageing-associated disorders
Anthony_Loera 03 Nov 2011
Now that I see it, i understand that it may not be done the way I originally thought.
The study is in the members only area.
Cheers
A
mpe 03 Nov 2011
Droplet 03 Nov 2011
ViolettVol 03 Nov 2011
ViolettVol 03 Nov 2011
The link does not appear to work. Do you mean the same thing as this? http://www.dailymail...o=feeds-newsxml
Link works for me, but it does not appear to be the same thing as the daily mail article.
Droplet 03 Nov 2011
Probably along the same lines though...been quite a bit of coverage as is fitting for something so exciting.Link works for me, but it does not appear to be the same thing as the daily mail article.
mikeinnaples 03 Nov 2011
MrHappy 03 Nov 2011
Isoprinosine (echinacea) would uprate T-lymphocyte production and may facilitate this effect in humans.
ViolettVol 03 Nov 2011
Krell 03 Nov 2011
Old Cells Advance Aging
By selectively killing senescent cells, researchers can slow the
decline of health in aging mice.
By Tia Ghose | November 2, 2011
Researchers have been able to delay the onset of age-related health
declines in mice by selectively killing off aging cells, suggesting
that cellular senescence can actively causing damage to surrounding
tissue. The findings, published today (November 2) in Nature, could
one day be used to create anti-aging therapies.
“It’s been speculated for some time that these senescent cells are a
major cause of what goes wrong with aging,” said molecular and cell
biologist Judith Campisi of the Buck Institute for Research on Aging
in Calif., who was not involved in the study. “So this is really a
very important step forward in validating that hypothesis.”
Indeed, researchers have long recognized the role of senescent cells—
aging cells which no longer divide—in the health decline that
accompanies aging, such as muscle weakness, heart problems, cataracts,
and other ailments. But it wasn’t clear whether aging cells cause harm
because they actively secrete inflammatory molecules such as
cytokines, or whether they were simply dead weight, harmful because
they had lost their normal cellular functions, said Norman Sharpless,
a gerontologist and oncologist at the University of North Carolina at
Chapel Hill, who was not involved in the study.
To answer this question, cancer biologist Jan van Deursen of the Mayo
Clinic and his colleagues developed a clever test. Senescent cells,
which often harbor genetic damage, secrete a tumor suppressor molecule
called p16. Van Deursen and his team created mice that age
prematurely, falling prey to a variety of age-related diseases early
in life. They also inserted a gene into the mouse genome, which
allowed them to selectively kill cells expressing p16 by feeding the
mice rosiglitazone, a common diabetes drug.
Mice fed a diet containing rosiglitazone from infancy took much longer
to develop muscle weakness, cataracts, and other signs of aging than
controls. Even when older mice were fed rosiglitazone, many of the age-
related problems plateaued. The findings suggest that senescent cells
actively cause harm, and that killing them can delay at least some
forms of aging. “If you translate that to humans, if you were to clear
senescent cells regularly from a young age, that would probably have a
major impact on health span,” van Deursen said.
Selectively killing off p16 didn’t slow all forms of aging, however.
The treatment had no effect on the unusually high rates of heart
disease seen in the mice. As a result, most mice still died of heart
problems and the overall lifespan of the mice didn’t increase. In
addition, the study looked at rapidly aging mice, but the researchers
need to confirm that the same benefits occur in naturally aging mice,
Campisi said.
Still, the study suggests a potential pathway for delaying aging in
humans, Sharpless said. If cytokines and other inflammatory signals
are the root of senescent cells’ adverse effects, “it’s not difficult
to make drugs that interfere with [such signaling].” The trick would
be determining which signals to target and ensuring that they don’t
have undesirable side-effects, such as lessening people’s immune
response to infection, he said.
D. J. Baker et. al, “Clearance of p16-Ink4a-positive senescent cells
delays ageing-associated disorders,” Nature, doi:10.1038/nature10600,
2011.
s123 03 Nov 2011
johnross47 03 Nov 2011
ihatesnow 03 Nov 2011
http://www.startribu.../133130703.html
Edited by ihatesnow, 03 November 2011 - 09:18 PM.
1kgcoffee 03 Nov 2011
Logan 04 Nov 2011
So, can we activate P16 and hope to get a some of the same effects? Anthony, do think it's time to try to make a product that can possibly even more potently activate P16 more than the one you guys have now?
In the study, they activated gene P 16 in order to trigger the killing off of senescent cells, correct???
canz 04 Nov 2011
I just posted this study in the bioscience section.
So, can we activate P16 and hope to get a some of the same effects? Anthony, do think it's time to try to make a product that can possibly even more potently activate P16 more than the one you guys have now?
In the study, they activated gene P 16 in order to trigger the killing off of senescent cells, correct???
From what I read, P16 becomes more prominent in aging and is the result of more senescent cells. Less P16, less senescent cells. However, from what I read this research is in it's infancy, and they are concerned that wiping out P16 may open up the potential for cancer cells, tumors to form and continue to grow. It is a good concept, but far from being totally understood.
ViolettVol 04 Nov 2011
Speaking of P16 ...aren't there a few supplements out there that affect it.
Yeah, anyone know which ones? I'm intrested in what thi reseach can tell us as to what to do now. What clkears out old cell junk best?
niner 04 Nov 2011
Elus 04 Nov 2011
Furthermore, activating tumor suppressors can dampen the replicative ability of cells, and you don't want to do this to immune cells which undergo clonal expansion. You may essentially prevent your immune system from adequately responding to pathogens.
Edited by Elus, 04 November 2011 - 02:30 PM.
Elus 04 Nov 2011
Activating P16 wouldn't do anything for you; it might even be bad. What you have to do is figure out a way to kill the cells that are expressing P16INK4a.
Haha niner, I just posted almost that same exact response in the other thread about this. Can you use your mod magic to fuse these threads?
Edited by Elus, 04 November 2011 - 02:34 PM.