The method of lengthening telomeres with telomerase, researched by the Spanish scientist María Blasco, is based on a relatively simple idea:
1. What are telomeres?
Telomeres are the protective "caps" of DNA at the ends of chromosomes, like the plastic tips on shoelaces. Every time a cell divides, telomeres shorten.
When they become too short:
the cell ages,
stops functioning properly (senescence),
or dies.
Blasco believes that telomere shortening is one of the drivers of biological aging.
2. What is telomerase?
Telomerase is a naturally occurring enzyme capable of rebuilding and lengthening telomeres.
It is primarily active in:
stem cells,
germ cells,
some immune cells,
and, dangerously, in many cancers.
The problem is that in most adult tissues, it's "switched off."
3. María Blasco's Discovery
Blasco and her team at the Spanish National Cancer Research Centre (CNIO) demonstrated in mice that telomerase could be temporarily activated without increasing cancer, resulting in:
greater longevity,
improved metabolic function,
improved brain function,
less osteoporosis,
less insulin resistance, and
improved neuromuscular function.
4. How did they do it?
Their most famous method used gene therapy:
They introduced the TERT gene (telomerase reverse transcriptase) using a harmless modified virus (AAV, adeno-associated adenovirus).
The idea:
A viral vector is injected.
The vector enters the body's cells.
It carries instructions to produce telomerase.
Telomerase repairs and lengthens damaged telomeres.
The cells regain some of their regenerative capacity.
In older mice, he achieved life extensions of approximately 13–24%, depending on the age at treatment.
5. Why doesn't it cause cancer (according to Blasco)?
The major fear was that telomerase also helps tumors.
Blasco's strategy attempted to minimize this because:
the AAV vector doesn't usually integrate into DNA (fewer mutations),
activation is transient, and
in animals, it didn't clearly increase cancer rates.
Even so, this remains the main scientific concern.
6. Is it already available for humans?
Not as an approved therapy.
To date:
There is NO approved medical treatment to "rejuvenate" with telomerase.
Blasco's studies were primarily in animals.
In humans, there are highly controversial private trials and clinics.
A famous case was that of Liz Parrish, who underwent experimental gene therapy claiming to have lengthened her telomeres, but without robust and widely accepted clinical evidence.
7. What does science say today?
Most gerontologists believe that:
telomerase is promising, but it probably won't be enough on its own.
Aging doesn't depend solely on telomeres; the following also play a role:
chronic inflammation,
mitochondrial damage,
senescent cells,
epigenetic alterations, and
loss of stem cells.
Many experts think the future will involve a combination of:
telomerase + partial epigenetic reprogramming (Yamanaka factors) + elimination of senescent cells + tissue regeneration.
My current scientific assessment would be:
Interesting and probably real in animals; not yet convincingly demonstrated as a general anti-aging therapy in humans. But it is one of the most serious and least "hype" lines of research in the field of longevity.