Brain Compression and Neuron Death: New Insights into Glioblastoma and Beyond
Physical pressure on the brain can trigger a self-destruction program in neurons, according to recent research from the University of Notre Dame. This discovery sheds light on the mechanisms behind neuron loss caused by chronic compression, such as that exerted by brain tumors, and could pave the way for new therapies to prevent neurological damage.
How Brain Compression Impacts Neurons
Neurons communicate through electrical signals transmitted via synapses, a network managed and modified by glial cells. When neurons die, this communication network is disrupted, leading to sensory loss, motor impairment, and cognitive decline. Researchers are now focusing on understanding how compression leads to neuron death, not just that it does.
The Notre Dame Study: Uncovering the Mechanisms
A team led by Meenal Datta, professor of aerospace and mechanical engineering at Notre Dame, and Christopher Patzke, assistant professor of biological sciences, investigated the mechanisms of neuron death caused by chronic compression. Their work, published in the Proceedings of the National Academy of Sciences, revealed several key processes.
Datta, whose TIME Lab studies the mechanics of tumors, had previously observed damage to the brain surrounding tumors. To understand how compression alone kills neurons, she collaborated with Patzke, who utilizes induced pluripotent stem cells (iPSCs) – cells reprogrammed from adult blood or skin cells – to create and study neuronal networks in the lab.
Modeling Compression in the Lab
Researchers grew neural cells and glial cells to mimic a neuronal network. They then applied pressure to the system, simulating the chronic compression caused by a glioblastoma tumor. Analysis showed that compressed neurons activated a programmed self-destruction signaling pathway.
Key Molecular Changes Observed
By analyzing messenger RNA from surviving cells, the researchers identified an increase in HIF-1 molecules, signaling for stress adaptive genes to improve cell survival, which paradoxically leads to inflammation in the brain. They as well observed increased expression of the AP-1 gene, indicating a neuroinflammatory response. Both reactions signal neuronal damage and impending death.
Clinical Relevance: Glioblastoma and Beyond
Analysis of data from the Ivy Glioblastoma Atlas Project showed that glioblastoma patients exhibit similar compressive stress patterns and gene expression changes, as well as synaptic dysfunction, mirroring the lab results. These findings were further confirmed in preclinical models using live compression systems.
These discoveries may explain the cognitive impairments, motor deficits, and increased seizure risk experienced by glioblastoma patients. The identified signaling pathways offer potential targets for drug development aimed at reducing neuronal death.
Expanding the Scope of Research
The researchers emphasize that their approach is “disease agnostic,” meaning the findings could extend to other brain pathologies involving mechanical forces, such as traumatic brain injury. Datta highlights the often-overlooked role of mechanics in cancer research and brain health.
Future Directions
“Understanding why neurons are so vulnerable and die upon compression is critical to prevent excessive sensory loss, motor impairment, and cognitive decline,” says Patzke. “This is how we will support patients.”
The study was funded by the National Institutes of Health and the Harper Cancer Research Institute at Notre Dame, with additional support from the Berthiaume Institute for Precision Health, the Genomics and Bioinformatics Core Facility, the Center for Research Computing, the Histology Core Facility, and the Integrated Imaging Facility. Datta and Patzke are also affiliated with Notre Dame’s Boler-Parseghian Center for Rare Diseases and the Warren Center for Drug Discovery.