Study Reveals Long-Term Aging In Brain Organoids

Peppercorn-sized clusters of human brain cells grown in a laboratory for a record seven years have aged in a way similar to the brain cells inside the human body, according to scientists.

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• Arlotta, a Harvard University professor, remarked the findings show that the brain can continue developing outside the human body for an unprecedented period.
• Researchers discovered that the organoids continued to develop and mature over the years, even though they had never been inside an embryo or a body.
• The study, published in Nature, remarked the organoids "recorded the passage of time and retain a memory of the developmental steps already performed."

Meanwhile, the tiny clusters, known as organoids, are grown from stem cells and are applied by researchers worldwide to study how the brain develops and to test new medicines without using animals such as mice.

Most organoids survive only for a few months. It limits them to showing the earliest stages of brain development. Human brains, by contrast, take almost 20 years to fully mature. Humans Can Actually Learn Dolphin-Like Echolocation in a Few Weeks.

In this study, a US-led research team kept some organoids alive for around seven years, making them the oldest ever grown, remarked Paola Arlotta, the senior author of the study.

In practice, the study, published in Nature, remarked the organoids "recorded the passage of time and retain a memory of the developmental steps already performed."

Arlotta stressed that this does not mean the organoids have memories in the human sense. Instead, their earlier development is preserved at a cellular level.

She described organoids as biological models of human brain cells that are much less complex than a real brain and do not receive sensory input. Scientists generally agree that they are not capable of consciousness or higher brain functions. Scientists Discover How Alzheimer's May Destroy Brain Cells.

Meanwhile, the researchers studied the ageing organoids using three lately developed genetic clocks that estimate the biological age of cells. All three indicated that the organoids changed over time in ways similar to normal brain cells.

To confirm their findings, the scientists additionally carried out what Arlotta called a "crazy experiment." They mixed cells that had been developing for a year with cells that were only two weeks old, creating a chimera.

Notably, the younger cells behaved normally, but the older cells moved ahead in development and began producing neurons that usually take around four months to form.

Arlotta remarked the experiment effectively "warped time" for brain development and could one day assist speed up the study of certain brain cells.

Notably, the previous record for the oldest brain organoids was a little under two years.

Unlike the brains inside our heads, these lab-grown organoids do not have a body that can become ill or die. Though she suspects they may last a little longer, arlotta remarked nobody knows whether they could theoretically outlive humans. The organoids applied in the new research have since been destroyed.

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