A new study has shown that targeting ultrasound stimulation to brain regions involved in processing pain can induce long-lasting changes in brain activity, significantly reducing pain perception. Published in Nature Communications, these findings point at a novel non-invasive strategy to treat chronic pain.
“Our study represents an important first step in understanding how this technology can non-invasively stimulate deep brain regions involved in pain processing,” said Sam Hughes, PhD, senior lecturer in pain neuroscience at the University of Exeter. “We found that targeting a specific brain region involved in pain processing can alter how pain is perceived and change how this area communicates with other parts of the brain’s pain network. The next stage of our research will be to test whether this approach can help people living with chronic pain.”
Hughes and colleagues used transcranial ultrasound stimulation (TUS), a low-intensity neuromodulation technique, to target the dorsal anterior cingulate cortex (dACC), a brain region implicated in chronic pain. The study recruited a total of 32 healthy volunteers, who were treated either with TUS or a sham while putting their right hand in a cold gel to trigger pain due to the low temperature. All participants were asked to rate the severity of the pain they were feeling and underwent MRI and MRS scans to monitor the physiological changes caused by the treatment.
Results showed that, while TUS had no immediate effect on pain intensity, participants reported a significant reduction in pain from 28 to 55 minutes after the stimulation, suggesting it can trigger a delayed analgesic effect. At the physiological level, TUS was found to disrupt the relationship between temperature and pain intensity, increasing the connectivity between the dACC and other brain regions involved in pain modulation and changing the concentration of the GABA neurotransmitter within the dCC.
“The study aimed to characterize how transcranial ultrasound stimulation interacts with—and potentially also alters—the brain’s processing of pain,” said Sophie Clarke, PhD, postdoctoral research fellow at the University of Plymouth and lead author of the study. “Understanding these mechanisms will be very important to support the next steps in understanding whether the stimulation can be effective in helping patients with chronic pain.”
Previous research at the University of Plymouth had shown the potential benefits of TUS for psychiatric conditions including anxiety, depression, and addiction. This study shows these benefits could extend beyond neurological disorders and one day offer a non-invasive treatment option for those experiencing chronic pain due to conditions such as fibromyalgia, back pain, and arthritis, or recovering after cancer treatment.
“Having shown the use of ultrasound can yield positive results for people with a variety of neurological conditions, we wanted to explore what it could mean for those living with chronic pain,” said Elsa Fouragnan, PhD, director of the University of Plymouth’s Brain Research and Imaging Centre (BRIC) and Centre for Therapeutic Ultrasound (CENTUS). “Most of us know someone experiencing chronic pain, and there are very few treatments that deliver any form of long-term benefit. The findings of this new work are really promising, and we are already building on it to assess whether TUS could be a beneficial and non-invasive therapeutic treatment.”
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