We've updated our Privacy Policy to make it clearer how we use your personal data. We use cookies to provide you with a better experience. You can read our Cookie Policy here.


Brain-on-a-Chip Uncovers the Link Between Concussion and Alzheimer’s Disease

A 3D model of a human head with the brain exposed.
Credit: David Matos / Unsplash.
Listen with
Register for free to listen to this article
Thank you. Listen to this article using the player above.

Want to listen to this article for FREE?

Complete the form below to unlock access to ALL audio articles.

Read time: 3 minutes

How much time elapses between a blow to the head and the start of damage associated with Alzheimer’s disease?

A device that makes it possible to track the effects of concussive force on a functioning cluster of brain cells suggests the answer is in hours. The “traumatic brain injury (TBI) on a chip” being developed at Purdue University opens a window into a cause and effect that announces itself with the passage of decades but is exceedingly difficult to trace back to its origins.

“We’re basically creating a miniature brain that we can hit and then study,” said Riyi Shi, lead researcher and the Mari Hulman George Endowed Professor of Applied Neuroscience in Purdue University’s College of Veterinary Medicine. “We know there’s a link between TBI and Alzheimer’s; that’s well established in clinical observation. But teasing out the basic essential pathway is not easy. With the TBI on a chip, we’re able to test a lot of hypotheses that would be very difficult to do in living animals.”

Want more breaking news?

Subscribe to Technology Networks’ daily newsletter, delivering breaking science news straight to your inbox every day.

Subscribe for FREE

In a study recently published in Lab on a Chip, a research team led by Shi subjected functioning clusters of cultured neurons from embryonic mice to three blows of 200 g-force, each approximating the higher end of what a football player receives in a single hit. The trauma leads to an immediate surge in production of acrolein — a molecule associated with oxidative stress and neurodegenerative disease — and a rise in misfolded clumps of the protein amyloid beta 42 (AB42), which is found in masses called plaques in the brains of people with Alzheimer’s disease. Additional experiments traced the links among impact, acrolein and AB42.

The device can also be used to test possible therapeutics, including drugs known to reduce acrolein levels. In the current study, Shi’s team used the device to show that the drug hydralazine, a known acrolein scavenger that is approved by the U.S. Food and Drug Administration for lowering blood pressure, reduces the amount of acrolein and levels of misfolded AB42 produced in the cluster of neurons after a hit. Shi, who has a long history of studying neurodegenerative disease, acrolein and hydralazine, said the TBI on a chip enabled a finding he’s sought over two decades of study.

“Now that we know what’s happening, is there something we can do about it? And the answer is yes,” said Shi, who is also a member of the Purdue Institute for Integrative Neuroscience. “Acrolein is time-dependent; the longer it’s there, the more AB42 aggregation it will cause. Here we show that if we lower acrolein with this drug, we can lower inflammation and AB42 aggregation.”

The device, custom-fabricated at the Purdue Center for Paralysis Research, uses a pendulum to deliver a specific g-force to a small chamber housing a cluster of a quarter million neurons supported by a bed of nutrients. A microelectronic array embedded in the chamber measures the electrical activity of the neurons, which will sustain functional firing patterns for several weeks, while a clear viewing port allows microscopic observation of the neurons.

Researchers remove the cluster of neurons from the chamber at intervals to take specific biochemical measurements.

“There’s several unique things that we do here, but one of the biggest is that you can hit this chip without damaging it, so you can give an impact to a live model and continue to study it,” Shi said.

Shi began working on the device in graduate school, incorporating over the course of several decades features that make it possible to study the aftereffects of an initial blow. A 2022 paper in Nature Scientific Reports used the device to show the surge in acrolein that occurs after a hit, and Shi said the most recent findings hint at the power of the model.

“Thanks to this device, people should know that when you get a concussion, you don’t have 10 years before you will see damage,” Shi said. “The clock starts ticking immediately, and if we want to do something about it, we need to act quickly.”

Within the first 24 hours after a hit, results show elevated levels of acrolein in the neuron clusters and a 350% increase in production of misfolded AB42. Shi said acrolein deforms normal AB42 by binding to sections of the protein that contribute to structural stability. Indeed, when the team conducted a simple experiment by combining large amounts of acrolein with normal purified AB42 suspended in fluid, they found elevated levels of misfolded AB42. The properly folded protein is sufficiently fragile that even subjecting normal purified AB42 in fluid (without acrolein) to an impact was enough to provoke misfolding.

“This amyloid beta pathology started within hours, maybe immediately. That’s never been heard of,” Shi said. “It’s like attacking the weight-bearing stud in a house wall. If you break that stud, of course the house is going to fall down.”

Reference: Rogers EA, Beauclair T, Martinez J, et al. The contribution of initial concussive forces and resulting acrolein surge to β-amyloid accumulation and functional alterations in neuronal networks using a TBI-on-a-chip model. Lab Chip. 2023;23(15):3388-3404. doi: 10.1039/D3LC00248A

This article has been republished from the following materials. Note: material may have been edited for length and content. For further information, please contact the cited source.