Telomere-lengthening procedure turns clock back years in human cells

Telomere-lengthening procedure...
Scientists have devised a method of lengthening telomeres, allowing cells to divide more times before dying (Image: AJC1 via Flickr - CC BY-SA 2.0)
Scientists have devised a method of lengthening telomeres, allowing cells to divide more times before dying (Image: AJC1 via Flickr - CC BY-SA 2.0)
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Scientists have devised a method of lengthening telomeres, allowing cells to divide more times before dying (Image: AJC1 via Flickr - CC BY-SA 2.0)
Scientists have devised a method of lengthening telomeres, allowing cells to divide more times before dying (Image: AJC1 via Flickr - CC BY-SA 2.0)
Head of the research, Dr Helen Blau(Photo: Stanford)
Head of the research, Dr Helen Blau(Photo: Stanford)

Researchers at the Stanford University School of Medicine have developed a new procedure to increase the length of human telomeres. This increases the number of times cells are able to divide, essentially making the cells many years younger. This not only has useful applications for laboratory work, but may point the way to treating various age-related disorders – or even muscular dystrophy.

Telomeres are the caps at the ends of our chromosomes that protect the DNA code of the genome. Linked to aging and disease, they are 8,000 to 10,000 nucleotides long in young people, but this decreases as we age (a nucleotide is an organic molecule that is a subunit of nucleic acids DNA and RNA). The researchers have found a way to lengthen a telomere by 1,000 nucleotides, which Dr. Helen Brau, professor of microbiology and immunology at Stanford, says is the equivalent of "many years of human life."

Telomeres shorten each time a cell divides and at a certain point, when they reach a critical length, the cell can no longer divide and will die. Their limited lifespan means that growing cells in laboratories can be tricky, given there can only be so many cell doublings before they give up the ghost. Telomere function in humans has been linked to many diseases and they have been studied for decades, often in the hope of better understanding or delaying the aging process.

Cells treated with Stanford’s procedure multiply in a similar way to much younger cells, compared with untreated cells of the same age. According to the researchers, skin cells with telomeres lengthened by the procedure were able to divide around 28 more times than untreated cells, while muscle cells divided about three more times. With this new procedure, which uses modified RNA, many more cells can be easily generated for study and drug development or disease modeling.

The “modified messenger” RNA contains the coding sequence for the active component of telomerase, called TERT. Telomerase is the enzyme that rebuilds telomeres and stem cells, including those that give rise eggs and sperm, express the enzyme at a much higher rate than other kinds of cells. Essentially, the RNA is a kind of genetic carrier pigeon in that it carries instructions from the DNA’s genes to the cell’s protein-making areas. Interestingly, in previous work Dr Blau found that the muscle stem cells of boys with Duchenne muscular dystrophy had far shorter telomeres than those not suffering from the disease.

Although application of this RNA initially causes telomeres to lengthen, within 48 hours they once again begin to shorten as cells divide. This is a good thing, however, as cells that divide endlessly could pose a increased cancer risk if used in humans.

Just three applications of the modified RNA over a short space of days can increase telomere length in muscle and skin cells.

"Our technique is nonimmunogenic," said postdoctoral scholar John Ramunas. "Existing transient methods of extending telomeres act slowly, whereas our method acts over just a few days to reverse telomere shortening that occurs over more than a decade of normal aging. This suggests that a treatment using our method could be brief and infrequent."

Researchers are now testing the technique on other types cells and may try to treat accelerated aging disorders or target types of muscle cells in cases of Duchenne muscular dystrophy, or even heart disease.

The team's paper was recently published in FASEB Journal.

Source: Stanford University

I have known that this was coming for years. You ain't seen anything yet.
The article does not mention whether the technique only works in a bowl of cells or if it can be used in a living animal.
Cells in a dish are one thing; systemic application to a mature mammal without disastrous side effects is quite another. We shall see.
Go science! Screw all the nay-sayers. Of course there will be problems, but if you don't try to begin with, you never learn.
Andrew Zuckerman
I'll be the first human trial. Contact me here and we'll figure it out
William H Lanteigne
Longer life doesn't necessarily mean better quality of life. What use is doubling lifespan if a person is destined to continue to live in poverty?
Would this be a treatment exclusively for the extremely wealthy?
Or would it be used for everyone?
Or would it be used sparingly, judiciously, only for those with a proven track record of doing great service to humankind?
I strongly suspect the first.
Terry Penrose
I strongly suspect the first as well, let's hope the method gets leaked and it's made available to everyone
Stacie Kubick
I have Ehlers Danlos Syndrome and I am miserable. I would sign up to be a guinea pig any day. What would I have to lose.
Si Wy
with this technology, humans will over-populate this planet very soon, as people will not age, and ultimately may live indefinitely. On the other hand, this will enable humans to travel long distances in space, and migration to other planets beyond the solar system will be possible.
EJacob Cornelius
I think regeneration capability (once operational) will be limited to the extremely wealthy, so overpopulation shouldn't be affected by much. The scary part is, what will the fortunate few (rich old men) do with this extra time?
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