Senescence is a beautiful word, whose sound might remind you of a perfume or an essential oil. However, in reality, it refers to the process by which a cell loses its ability to divide and grow, leading to its gradual deterioration. In essence, aging is the inevitable and guaranteed path to cell death.

A New Perspective on Slowing Down Aging

Researchers from the Cornell University College of Veterinary Medicine claim there is an effective way to slow down or even halt this process. The key lies in extracellular vesicles—tiny membrane-bound particles ranging from 10 microns to 20 nanometers in size, released by cells and found in the space between them.

In their article in the Journal of Biological Chemistry, lead author Shun Enomoto and his colleagues explore how extracellular vesicles derived from embryonic stem cells can protect other cells from oxidative stress. This stress arises from an excess of free radicals and a lack of antioxidants, which leads to cell dysfunction and, ultimately, cell death.

Extracellular Vesicles and the Fight Against Aging

Experiments have shown that extracellular vesicles from embryonic stem cells can prevent senescence. According to Enomoto, a doctoral student in biochemistry, molecular, and cell biology, this process can be compared to harnessing a "fountain of youth."

It was previously known that extracellular vesicles help embryonic stem cells maintain their properties. Now, scientists wanted to find out whether these vesicles could also repair damaged tissues and slow down cellular aging. As Enomoto notes, the next question for researchers was: can extracellular vesicles not only help cells recover but also slow down or stop their aging?

Experimental Results

After isolating extracellular vesicles from mouse embryonic stem cells, the scientists added them to ordinary differentiated cells (such as nerve, muscle, skin, and others). The results were impressive: cells treated with the vesicles completely stopped the process of senescence—their deterioration ceased.

"It was amazing to see how the treated cells continued to grow even when the untreated ones had already stopped," says Mark Antoniaque, associate professor of molecular medicine, who worked alongside Enomoto and chemistry professor Ricardo Cerione.

Mechanism of Action

Further experiments revealed that extracellular vesicles halt senescence thanks to the protein fibronectin, which coats their surface. This protein promotes the release of enzymes that block the effects of oxidative stress, which triggers cellular aging.

Previously, scientists considered the possibility of using extracellular vesicles from "young blood," which help older mice combat aging, as well as the role of physical exercise in stimulating the formation of such vesicles that support neurogenesis and prevent neurological decline. The research at Cornell University marks a new step in the field of anti-aging technologies.

Prospects and Significance of the Discovery

"Our ultimate goal is to test these vesicles directly in mice to see if they affect the aging of the organism," says Enomoto. If these tests are successful, the researchers plan to try the technology on human cells, using adult cells that have been genetically reprogrammed to an embryonic state.

The significance of this discovery is enormous—it is important not only for increasing lifespan but also for improving its quality, notes Antoniaque. "This work could have a major impact on human health."