New research shows brain cells can signal through rapid physical rearrangements, challenging the long-standing belief that neural communication depends solely on electrical activity.
By yourNEWS Media Newsroom
For more than a century, neuroscience has framed the brain as an electrical organ, its functions governed by impulses racing along neurons and across synapses. That model has shaped how scientists understand learning, memory, and disease. New research now indicates that this view is incomplete.
A study conducted at the University of Southern California has identified an alternative communication pathway in neurons that operates without electrical signals. Instead, neurons can transmit information through rapid physical and structural changes, allowing brain circuits to maintain balance even when electrical activity is disrupted.
The research, led by Professor Dion Dickman of USC Dornsife College and published in the Proceedings of the National Academy of Sciences, focuses on how neurons preserve stability, a process known as homeostatic plasticity. This mechanism ensures that neural networks neither become overactive nor fall silent, a balance essential for normal brain function.
Using fruit flies as a model system, researchers examined synapses, the microscopic junctions where neurons communicate. Under typical conditions, a sending neuron releases neurotransmitters that bind to receptors on the receiving neuron, triggering an electrical response. The team deliberately blocked glutamate receptors on the receiving neuron, simulating a breakdown in communication.
Rather than responding through changes in electrical signaling, the receiving neuron reacted physically. The blocked receptors shifted their positions within the synapse, reorganizing the synaptic structure itself. This structural rearrangement acted as a signal, instructing the sending neuron to increase its release of neurotransmitters, restoring balance across the connection.
The study identified a scaffold protein called DLG as essential to this process. DLG functions as an organizational framework within the synapse, anchoring receptors and linking them to the cell’s internal machinery. When DLG was removed through genetic manipulation, the compensatory response failed, and communication could not be stabilized.
Crucially, the researchers found that this entire signaling process continued even when all electrical activity in the synapse was chemically silenced. The finding demonstrates that the mechanism is independent of ionic flow and electrical impulses, relying instead on physical structure and spatial organization.
The discovery introduces a third mode of neural communication alongside electrical and chemical signaling. It suggests that neurons not only listen for signals but also monitor the physical integrity and arrangement of their connections, allowing for rapid correction when disruptions occur.
Scientists say this structural signaling pathway may help explain the brain’s resilience in the face of stress, fatigue, aging, or injury. By enabling immediate stabilization, it may serve as a first line of defense before slower biological processes, such as changes in gene expression, take effect.
The findings also open new avenues for understanding neurological and developmental disorders. Conditions such as epilepsy and autism are associated with disruptions in neural balance. If the physical architecture of synapses plays a central role in maintaining stability, impairments in scaffold proteins or synaptic organization could contribute to these disorders.
Researchers caution that further work is needed to determine how this mechanism operates in mammalian brains and whether it can be targeted therapeutically. Still, the study reshapes fundamental assumptions about how the brain functions.
Rather than acting solely as an electrical network, the brain appears to be a dynamically structured system, constantly reshaping its microscopic architecture to preserve equilibrium. The discovery adds a new dimension to neuroscience, suggesting that, alongside electrical signals, neurons also communicate through quiet structural adjustments that help keep the mind stable.
Source: Natural News
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