Researchers at the University of Notre Dame report that chronic physical pressure on the brain triggers neurons to activate self-destruct programs, killing them by several direct and indirect mechanisms. Neuron loss is irreversible and helps explain sensory deficits, motor impairment, cognitive decline and elevated seizure risk seen in patients.
The study, published in the Proceedings of the National Academy of Sciences, was co-led by Meenal Datta of the TIME Lab and Christopher Patzke. The team grew networks of neurons and glial cells from induced pluripotent stem cells (iPSCs) and applied sustained compression to mimic the mechanical effects of a growing mass in the brain. Graduate students Maksym Zarodniuk and Anna Wenninger compared cell survival after compression.
mRNA sequencing showed increased HIF-1 molecules, which drive stress-adaptive gene programs and can promote inflammation, and a rise in AP-1 gene expression linked to neuroinflammatory responses. Analysis of the Ivy Glioblastoma Atlas Project revealed similar stress signatures, gene-expression changes and synaptic dysfunction in glioblastoma patients. Experiments using a live compression system on preclinical brain models further supported these findings.
The researchers say the signaling pathways they identified offer possible drug targets to reduce neuronal death. Their method is disease-agnostic and could apply to other conditions that alter brain mechanics, such as traumatic brain injury. The study received funding from the National Institutes of Health and the Harper Cancer Research Institute at Notre Dame.
Difficult words
- neuron — nerve cell that sends and receives signalsneurons
- chronic — continuing for a long time
- compression — force that presses something into smaller space
- irreversible — cannot be changed back to the original state
- inflammation — body response causing redness and swelling
- neuroinflammatory — involving inflammation in the nervous system
- synaptic dysfunction — problems with connections between nerve cells
- disease-agnostic — not specific to one particular disease
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How might drugs that target the identified signaling pathways change outcomes for patients with brain compression? Give possible benefits and risks.
- The study method is described as disease-agnostic. How could this approach be useful for conditions like traumatic brain injury?
- What challenges do you think researchers face when translating findings from cell and preclinical models to treatments for human patients?
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