Printing The Mind: Scientists Create Functional Human Brain Tissue

Our brain can perform about 100 trillion operations per second. The human brain possesses about 100 billion neurons. It is the most complicated organ that nature has ever created. Despite medical advances, very little is known about it. But now it all could change, as scientists have achieved a big brain breakthrough! They used a 3D printer to build tiny pieces of brain tissue that act almost like real brains.

UNLOCKING THE SECRETS OF OUR BRAIN

Reminiscent of a science fiction movie, the world's first 3D-printed brain tissue grows and behaves similarly to natural brain tissue. A team of University of Wisconsin-Madison scientists announced the breakthrough. "It could change the way we look at stem cell biology, neuroscience, and the pathogenesis of many neurological and psychiatric disorders," says Su-Chun Zhang, professor of neuroscience and neurology at UW-Madison's Waisman Center.

These printed brains are tiny and not perfect copies. The printed tissue lacks the full complexity and scale of a human brain. The scientists flipped the usual method of 3D printing on its side, fabricating horizontal layers of brain cells encased in soft "bio-ink" gel. According to a study published in the journal Cell Stem Cell, the researchers developed a 3D bioprinting platform to arrange tissues with defined human neural cell types. This was done using a commercial 3D printer. Later during experiments, the 3D-printed brain tissue began showing electrical activity. According to the researchers, the cells then started forming networks, much like the human brain, and started to communicate with each other through the neurotransmitters they formed.

Understanding how the brain functions has long perplexed scientists. Stimulation and computer animations offer glimpses of how the brain functions, but for the first time, scientists were able to witness it grow. "In the past, we have often looked at one thing at a time, which means we often miss some critical components. Our brain operates in networks. We want to print brain tissue this way because cells do not operate by themselves. They talk to each other. This is how our brain works, and it has to be studied all together like this to truly understand it," Zhang says.

3D-PRINTED BRAINS OFFER HOPE FOR NEW TREATMENTS

In the past, scientists have created three-dimensional structures that can simulate the functionality and architecture of the human brain. But the lack of control over the intricate design was a big letdown. But now, 3D printing offers the solution to accurately map and manufacture such small neural patterns. Researchers say that this could help closely monitor the functioning of the human brain. Previously, scientists performed experiments on animal brains, but they lack the complexities of a human brain. Now, 3D brain tissue could increase understanding and help cure diseases like Parkinson's and Alzheimer's.

The potential applications of this technology extend beyond disease research. Studying printed brain tissue could provide unprecedented insights into brain development, learning, and memory. But there are also ethical concerns regarding consciousness and implications. For now, this development is opening up a whole new chapter in medical science, offering hope for millions.