Scientists reverse aging: cells of an 80-year-old person rejuvenated by more than 60 years

Aging has long been considered a process that is practically impossible to reverse. However, modern research shows that some age-related changes can be corrected at the cellular level.

A new study by scientists from the University of Bonn and the University Hospital Bonn attracted attention precisely because of this result. The researchers found that with a certain method of reprogramming, human cells are able to gradually acquire signs of a younger biological state.

How scientists managed to rejuvenate cells by 60 years

At the center of the study were erythroid progenitor cells — immature cells from which red blood cells normally form.

Using special molecular factors, the researchers reprogrammed them, turning them into induced neural stem cells. Such cells are capable of giving rise to various types of cells of the nervous system.

The most interesting thing happened during this transformation.

The scientists found that along with the change in cellular specialization, pronounced rejuvenation at the molecular level also occurred. As reprogramming progressed, epigenetic markers changed, which make it possible to assess the biological age of cells.

As a result, cells obtained from an 80-year-old person demonstrated molecular signs of an age of less than 20 years.

The researchers observed rejuvenation of approximately 60 years after just 50 days of reprogramming. Moreover, the entire process was tracked over more than 100 days.

This allowed the scientists to study not only the final result but also the gradual changes occurring inside the cells.

Why this discovery is important for science

The age of a cell is determined not only by the number of years a person has lived. Changes in gene activity, the state of cellular structures, and the regulation of biological processes play a major role.

One of the tools for assessing aging is the epigenetic clock. It analyzes certain chemical changes in DNA whose patterns are associated with age.

At the same time, the DNA sequence itself does not necessarily change: the mechanisms regulating gene activity change.

In the study by the German scientists, reprogramming was accompanied by a significant change in such markers. This points to the possibility of returning some cellular characteristics to a younger state.

However, there is a fundamental nuance here: rejuvenation according to the epigenetic clock does not mean that the person as a whole has become 60 years younger.

This refers to cells obtained in the laboratory and their molecular characteristics, not to reversing the aging of the entire organism.

Can the technology help with Alzheimer's disease

One of the most promising areas for applying the discovery is related to the study of diseases of the nervous system.

Age is the most important risk factor for the development of neurodegenerative diseases, including Alzheimer's disease. In such conditions, nerve cells gradually lose the ability to function normally, and brain tissue undergoes complex changes.

Obtaining neural stem cells from material from elderly donors may provide researchers with new opportunities to study age-related processes.

For example, scientists will be able to investigate which molecular mechanisms are associated with aging of the nervous system, which factors accelerate cellular changes, and which interventions can correct them.

In the future, such models may help in the search for new therapeutic approaches.

But it is not yet possible to speak of a ready-made treatment for Alzheimer's disease. The study opens new opportunities for studying the mechanisms of rejuvenation rather than proving that the technology is already capable of restoring a patient's brain.

How this method differs from previous experiments

Researchers have previously demonstrated the possibility of rejuvenating cells through reprogramming.

However, traditional approaches often involved two stages: first the original cell was turned into a pluripotent stem cell, and then its development was directed toward the desired type of tissue.

The German team used a different approach: blood cells were directly converted into neural stem cells, bypassing the pluripotent stage.

This made it possible to observe the gradual change in molecular age over several weeks.

For science, such an opportunity is especially valuable. If researchers can establish which factors control the rejuvenation process, it will become possible to purposefully study ways of influencing cellular aging.

When will rejuvenation become available to people

Despite the impressive results, practical application of the technology is still far off.

Laboratory production of cells that are young by molecular markers and the safe restoration of tissues inside the human body are completely different tasks.

Before such methods are used in medicine, it is necessary to determine how stably the properties of the obtained cells are preserved, whether their use is safe, and whether they are capable of performing the required functions after potential transplantation.

Control of cell growth and the risk of undesirable changes is of particular importance. Reprogramming must not only restore individual characteristics of a young state but also ensure predictable cell behavior.

Therefore, for now it cannot be claimed that scientists have found a way to rejuvenate a person by 60 years or have developed a universal anti-aging remedy.

Can aging really be reversed?

The new study adds an important argument in favor of the idea that some signs of cellular aging are not absolutely irreversible.

The scientists showed that a change in cellular specialization can be accompanied by a significant decrease in molecular age. And the ability to observe this process gradually opens new directions for fundamental research.

In the future, such technologies may help to better understand the mechanisms of aging, study neurodegenerative diseases, and create cellular models for drug development.

But there is still a long way to go before proven methods of rejuvenating the human body appear.

The main result of the study is not that scientists have already learned how to restore youth to people, but that human cells have demonstrated a much greater capacity for molecular rejuvenation than could have been assumed.

And now researchers face the next question: will it be possible to use this mechanism for the safe restoration of damaged tissues and the fight against diseases whose risk increases with age?