Harvard Scientists Reverse the Ageing Process in Mice Now for Humans
By Ian Sample | guardian.co.uk
In mice, reactivating the enzyme telomerase led to the repair of damaged tissues and reversed the signs of ageing.
Harvard scientists were surprised that they saw a dramatic reversal, not just a slowing down, of the ageing in mice. Now they believe they might be able to regenerate human organs
Scientists claim to be a step closer to reversing the ageing process after rejuvenating worn out organs in elderly mice. The experimental treatment developed by researchers at the Dana-Farber Cancer Institute, Harvard Medical School, turned weak and feeble old mice into healthy animals by regenerating their aged bodies.
The surprise recovery of the animals has raised hopes among scientists that it may be possible to achieve a similar feat in humans or at least to slow down the ageing process.
An anti-ageing therapy could have a dramatic impact on public health by reducing the burden of age-related health problems, such as dementia, stroke and heart disease, and prolonging the quality of life for an increasingly aged population.
"What we saw in these animals was not a slowing down or stabilisation of the ageing process. We saw a dramatic reversal and that was unexpected," said Ronald DePinho, who led the study, which was published in the journal Nature.
"This could lead to strategies that enhance the regenerative potential of organs as individuals age and so increase their quality of life. Whether it serves to increase longevity is a question we are not yet in a position to answer."
The ageing process is poorly understood, but scientists know it is caused by many factors. Highly reactive particles called free radicals are made naturally in the body and cause damage to cells, while smoking, ultraviolet light and other environmental factors contribute to ageing.
The Harvard group focused on a process called telomere shortening. Most cells in the body contain 23 pairs of chromosomes, which carry our DNA. At the ends of each chromosome is a protective cap called a telomere. Each time a cell divides, the telomeres are snipped shorter, until eventually they stop working and the cell dies or goes into a suspended state called "senescence". The process is behind much of the wear and tear associated with ageing.
At Harvard, they bred genetically manipulated mice that lacked an enzyme called telomerase that stops telomeres getting shorter. Without the enzyme, the mice aged prematurely and suffered ailments, including a poor sense of smell, smaller brain size, infertility and damaged intestines and spleens. But when DePinho gave the mice injections to reactivate the enzyme, it repaired the damaged tissues and reversed the signs of ageing.
"These were severely aged animals, but after a month of treatment they showed a substantial restoration, including the growth of new neurons in their brains," said DePinho.
Repeating the trick in humans will be more difficult. Mice make telomerase throughout their lives, but the enzyme is switched off in adult humans, an evolutionary compromise that stops cells growing out of control and turning into cancer. Raising levels of telomerase in people might slow the ageing process, but it makes the risk of cancer soar.
DePinho said the treatment might be safe in humans if it were given periodically and only to younger people who do not have tiny clumps of cancer cells already living, unnoticed, in their bodies.
David Kipling, who studies ageing at Cardiff University, said: "The goal for human tissue 'rejuvenation' would be to remove senescent cells, or else compensate for the deleterious effects they have on tissues and organs. Although this is a fascinating study, it must be remembered that mice are not little men, particularly with regard to their telomeres, and it remains unclear whether a similar telomerase reactivation in adult humans would lead to the removal of senescent cells."
Lynne Cox, a biochemist at Oxford University, said the study was "extremely important" and "provides proof of principle that short-term treatment to restore telomerase in adults already showing age-related tissue degeneration can rejuvenate aged tissues and restore physiological function."
DePinho said none of Harvard's mice developed cancer after the treatment. The team is now investigating whether it extends the lifespan of mice or enables them to live healthier lives into old age.
Tom Kirkwood, director of the Institute for Ageing and Health at Newcastle University, said: "The key question is what might this mean for human therapies against age-related diseases? While there is some evidence that telomere erosion contributes to age-associated human pathology, it is surely not the only, or even dominant, cause, as it appears to be in mice engineered to lack telomerase. Furthermore, there is the ever-present anxiety that telomerase reactivation is a hallmark of most human cancers."
Fountain of Youth in Bile? Longevity Molecule Identified
Aubrey de Grey, Artificial Intelligence, Singularity, Longevity and the Holy Grail
Latest News from our Front Page
White Women Are Getting Fed Up
We are sick and tired of having our countries ruined, seeing our folk demoralized, and being hated and blamed for all of the worlds problems. We are speaking out, and standing up for our people. We will not let this continue. Letβs get this video trending on Twitter with #Whitewomenarefedup, and get this video to go viral!
Serbian government bans anti-mass immigration protests, and plans ahead for mass immigration
Nebojsa Stefanovic, Serbia’s Interior Minister said protesters who are concerned about “an EU plan” to settle thousands of illegal immigrants into the country, will not be allowed to voice their concerns in a protest march on Monday, 31st of August.
“We will not allow the expression of intolerance and hatred to be something that is characteristic of Serbia” said Stefanovic.
“The Ministry ...
Iran Commander: We're Getting Prepared to Overthrow Israel
As the White House secured their last needed vote to block a veto override in the Senate on the nuclear deal, Iran unleashed a double-pronged attack: vowing to block inspector access to some sites, and vowing to continue preparations to destroy Israel.
Iranian Defense Minister Brigadier General Hossein Dehqan said today that the International Atomic Energy Agency — which inked confidential ...
Jailed for Not Marrying the Gays
Five of six deputies in the office of a Kentucky county clerk taken into custody Thursday for her refusal to issue marriage licenses after the Supreme Court allowed gays to wed say they will process the paperwork starting Friday.
But Rowan County Clerk Kim Davis, whom U.S. District Court Judge David Bunning found in contempt of court, said through her lawyers that she will not authorize ...
German Government Evict Poor Germans From Their Homes For Migrant Asylum Seekers
This is a video of a report on replacement of poor Germans with Middle Eastern asylum seekers. This was made broudcasted on a German Left-leaning TV station on August 28, 2015. It's original title: The most poor of the poor have to vacate their homes for asylum seekers.
|More News » |