They discover the possible reason why men live less than women

The loss of the male sex chromosome (Y) in old age, it scars the heart muscle and can lead to fatal heart failure, but it could also be the reason why men live, on average, a few years less than women.

These are the main conclusions of a study conducted by Kenneth Walshresearcher at the University of Virginia School of Medicine (USA), who suggests that men who lose their Y chromosome – about 40% of those over 70 – could benefit from a drug that heals damaged tissue.

According to the research, published in the journal Sciencethis medicine could counter the harmful effects of chromosome losswhich can manifest not only in the heart, but also in other parts of the body.

In the United States, women live an average of five years longer than men. The finding from this study “could explain nearly four of those five years of difference,” according to Walsh. “Especially after 60, men die faster than women. It’s like aging biologically faster. This research gives clues as to why men have shorter lives than women,” adds the researcher.

While women have two X chromosomes, men have an X and a Y, but with age many begin to lose the Y chromosome in part of their cells, which is especially safe in smokers.

It has been observed that men who suffer from the loss of the Y chromosome in their white blood cells are more likely to die at a younger age and to suffer from age-related illnesses, such as Alzheimer’s disease, but the cause of which had not previously been identified.

Walsh’s research is the first to show that this loss has adverse health effects men.

Methodology

To do the research, Walsh and his team used the CRISPR gene editing technique and developed a special mouse model to study the effects of Y chromosome loss in the blood of mice.

They found that this loss accelerated diseases age-related, it made the mice more prone to heart scarring and led to earlier death.

But for the scientists, it wasn’t the result of simple inflammation: rather, the mice underwent a complex series of immune system responses that led to a process called fibrosis throughout the body.

The authors believe that this tug of war of the immune system can accelerate the development of the disease. The team also looked at the effects of Y chromosome loss in men using data collected from the UK Biobank. In this sense, they discovered that the loss of the Y chromosome was associated with cardiovascular disease and heart failure and that the more the loss of chromosomes increased, the greater the risk of death.

These findings suggest that countering the effects of Y-chromosome loss could help men live longer, healthier lives.

For Walsh, a possible treatment option could be medication, the pirfenidone, which has already been approved by the Federal Food and Drug Administration (FDA) to treat idiopathic pulmonary fibrosis, a form of lung scarring. The drug is also being tested for the treatment of heart failure and chronic kidney disease, two conditions that cause tissue scarring.

Walsh thinks men with Y-chromosome loss may respond particularly well to this drug and other classes of antifibrotic drugs currently in development, though more research is needed to determine this.

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