Novel approach finds targets for future clinical trials in depression and Parkinsons disease.
Researchers have made significant advancements in correlating aberrations in specific brain circuits with neuropsychiatric conditions like depression. However, it remains difficult to prove that damage to these circuits causes the symptoms themselves and that targeting them with therapeutics could help patients. By integrating brain lesion datasets with data on how two treatments deep brain stimulation (DBS) and transcranial magnetic stimulation (TMS) influence neuropsychiatric disorders, researchers fromBrigham and Womens Hospitaland collaborators developed a new brain mapping approach that may help clarify the cause of a variety of neuropsychiatric conditions and identify promising stimulation sites to target therapeutically. Findings are published inNature Human Behavior.
This is a new technique that uses existing data on patients with brain damage to develop new treatment targets for real-world patients with similar symptoms, said the papers corresponding author,Shan Siddiqi, MD,of theCenter for Brain Circuit Therapeuticsat the Brigham. In principle, this should open the floodgates for researchers to study any stroke- or brain-injury-associated symptom to find a new treatment target for people who developed the same symptom without brain damage.
The researchers developed their approach using data on depression and Parkinsons disease, both of which are already associated with well-defined brain lesions and are commonly treated with DBS and TMS. They combined the location and connectivity of 461 brain lesions, 101 DBS sites, and 151 TMS sites, and compared patients who developed depression, patients who had improvement in depression, and patients who had no change in mood. Using this approach, they identified a brain circuit that is an effective therapeutic target for both invasive and noninvasive brain stimulation treatments. The study also indicates that brain stimulation outcomes vary not according to the technique used DBS versus TMS but according to the circuit that is targeted.
The researchers subsequently used their approach with Parkinsons disease data. Combining data on 29 lesions and 95 stimulation sites for tremors and rigidity, they showed that lesions associated with the motor symptoms of Parkinsons disease are connected to the same circuits as the stimulation sites that that relieve those symptoms.
The researchers are now working to refine circuit maps for other neuropsychiatric conditions such as anxiety disorders, post-traumatic stress disorder, mania, hallucinations, and movement disorders. Clinical trials are still necessary to determine whether physicians can relieve patient symptoms by targeting the brain circuits identified through the new approach. The authors of the study are currently conducting a trial to confirm the distinct TMS targets that they recently identified for depression and anxiety.
Now that we have concrete evidence that lesions map to treatment targets, we can design more clinical trials to generate new treatments, Siddiqi said. This approach gives us highly rigorous hypotheses about treatment targets. When we dont know much about the brain circuitry of a particular disorder, our study shows how to find the answer to that question and turn it into new treatment targets.
Reference: Brain stimulation and brain lesions converge on common causal circuits in neuropsychiatric disease by Shan H. Siddiqi, Frederic L. W. V. J. Schaper, Andreas Horn, Joey Hsu, Jaya L. Padmanabhan, Amy Brodtmann, Robin F. H. Cash, Maurizio Corbetta, Ki Sueng Choi, Darin D. Dougherty, Natalia Egorova, Paul B. Fitzgerald, Mark S. George, Sophia A. Gozzi, Frederike Irmen, Andrea A. Kuhn, Kevin A. Johnson, Andrew M. Naidech, Alvaro Pascual-Leone, Thanh G. Phan, Rob P. W. Rouhl, Stephan F. Taylor, Joel L. Voss, Andrew Zalesky, Jordan H. Grafman, Helen S. Mayberg and Michael D. Fox, 8 July 2021, Nature Human Behavior.DOI: 10.1038/s41562-021-01161-1
This work was supported by the Sidney R. Baer Foundation, the Brain & Behavior Research Foundation, and the National Institute of Mental Health (K23MH121657, R01MH113929 and R01MH115949). Siddiqi serves as a scientific consultant for SigNeuro LLC and as a clinical consultant for Kaizen Brain Center. He and co-author Michael Fox, MD, PhD, have jointly received investigator-initiated research support from Neuronetics. None of these organizations were involved in the present work. Siddiqi and Fox each own independent intellectual property on the use of brain network mapping to target neuromodulation. The present work did not utilize any of this intellectual property.
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