Using lab-grown human mini-brains, scientists find links between head trauma, herpes, and Alzheimer's

At Tufts University in Medford, Mass., researchers loaded a tiny 3D model of the human brain into a plastic shell resting atop a spring-loaded platform. Inside this polymer skull, the donut-shaped ball of living brain tissue floated in a warm salty bath, its neurons whispering to each other in the darkness. Then a piston struck the platform, whipping it back and forth, and sending the mini-brain sloshing.

Days later, as the team assessed the damage, the results were stark. Some of the human brain-like tissue had been housing a latent infection with a herpes virus, the type that causes cold sores. And the impact of the piston — intended to mimic a concussion — had woken that virus up. In those tissues, the researchers found lots of inflammation, newly formed plaques of sticky amyloid proteins, and all around them dying neurons — the signature marks of Alzheimer’s disease. Meanwhile, infection-free brain tissues recovered from the concussion with just a bit of lingering inflammation. 

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