What if the very structures we thought were destroying the brain are actually helping to save it? A new study from the Hebrew University of Jerusalem reveals that protein clumps long associated with neurodegenerative diseases such as Huntington's may serve as a protective "quarantine" system, shielding neurons from stress. The findings also identify ATF3 (Activating Transcription Factor 3), a key cellular stress-response protein, as a central regulator of this defense mechanism.
For decades, protein clumps known as "inclusion bodies" were considered toxic hallmarks of diseases like Huntington's. However, research led by Dr. Walaa Oweis under the supervision of Prof. Eran Meshorer from the Institute of Life Sciences and the Edmond and Lily Safra Center for Brain Sciences (ELSC) suggests these structures may actually help neurons survive.
A Tale of Two Neurons
Published in Cell Death & Differentiation, the study used patient-derived stem cells to create genetically identical human neurons, some of which formed inclusion bodies while others did not. When exposed to stress, neurons lacking the protein clumps died at much higher rates, while those containing inclusion bodies proved significantly more resilient. The findings suggest that inclusion bodies act as a biological containment system, isolating harmful misfolded proteins before they can damage the cell.
The Master Switch of Cellular Survival
The researchers also identified ATF3 as a key regulator of this protective response. When ATF3 was removed, neurons lost their ability to form inclusion bodies and became far more vulnerable to stress. The protein was found to activate genes involved in the cell's unfolded protein response, one of its primary defense systems.
"Our results reveal a previously unknown role for ATF3 in orchestrating the formation of inclusion bodies in human neurons," said Prof. Meshorer. "These structures are not merely byproducts of disease, but a central factor in the cell's ability to mount a protective response against stress."
"Our results reveal a previously unknown role for ATF3 in orchestrating the formation of inclusion bodies in human neurons. These structures are not merely byproducts of disease, but a central factor in the cell's ability to mount a protective response against stress." - Prof. Meshorer.
The team also observed the same molecular signatures in human brain tissue, supporting the relevance of their findings to disease progression. Rather than eliminating protein clumps, future therapies may benefit from enhancing the brain's own protective mechanisms.
The research paper titled “ATF3-dependent formation of inclusion bodies in polyQ-expressing human iPSC-derived neurons confers cellular protection” is now available in Cell Death & Differentiation and can be accessed here.
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